Mantle-derived helium in hot springs of the Cordillera Blanca, Peru: Implications for mantle-to-crust fluid transfer in a flat-slab subduction setting
Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of t...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Newell, Dennis L. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015transfer abstract |
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| Umfang: |
10 |
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| Übergeordnetes Werk: |
Enthalten in: An iterated greedy algorithm for distributed blocking flow shop with setup times and maintenance operations to minimize makespan - Miyata, Hugo Hissashi ELSEVIER, 2022, (including Isotope geoscience) : official journal of the European Association for Geochemistry, New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:417 ; year:2015 ; day:6 ; month:12 ; pages:200-209 ; extent:10 |
| Links: |
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| DOI / URN: |
10.1016/j.chemgeo.2015.10.003 |
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| 245 | 1 | 0 | |a Mantle-derived helium in hot springs of the Cordillera Blanca, Peru: Implications for mantle-to-crust fluid transfer in a flat-slab subduction setting |
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| 520 | |a Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. | ||
| 520 | |a Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. | ||
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| 700 | 1 | |a Hilton, David R. |4 oth | |
| 700 | 1 | |a Shaw, Colin A. |4 oth | |
| 700 | 1 | |a Hughes, Cameron A. |4 oth | |
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10.1016/j.chemgeo.2015.10.003 doi GBVA2015020000005.pica (DE-627)ELV029275008 (ELSEVIER)S0009-2541(15)30050-4 DE-627 ger DE-627 rakwb eng 550 550 DE-600 004 VZ 85.35 bkl 54.80 bkl Newell, Dennis L. verfasserin aut Mantle-derived helium in hot springs of the Cordillera Blanca, Peru: Implications for mantle-to-crust fluid transfer in a flat-slab subduction setting 2015transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Jessup, Micah J. oth Hilton, David R. oth Shaw, Colin A. oth Hughes, Cameron A. oth Enthalten in Elsevier Miyata, Hugo Hissashi ELSEVIER An iterated greedy algorithm for distributed blocking flow shop with setup times and maintenance operations to minimize makespan 2022 (including Isotope geoscience) : official journal of the European Association for Geochemistry New York, NY [u.a.] (DE-627)ELV008354693 volume:417 year:2015 day:6 month:12 pages:200-209 extent:10 https://doi.org/10.1016/j.chemgeo.2015.10.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 85.35 Fertigung VZ 54.80 Angewandte Informatik VZ AR 417 2015 6 1206 200-209 10 045F 550 |
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10.1016/j.chemgeo.2015.10.003 doi GBVA2015020000005.pica (DE-627)ELV029275008 (ELSEVIER)S0009-2541(15)30050-4 DE-627 ger DE-627 rakwb eng 550 550 DE-600 004 VZ 85.35 bkl 54.80 bkl Newell, Dennis L. verfasserin aut Mantle-derived helium in hot springs of the Cordillera Blanca, Peru: Implications for mantle-to-crust fluid transfer in a flat-slab subduction setting 2015transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Jessup, Micah J. oth Hilton, David R. oth Shaw, Colin A. oth Hughes, Cameron A. oth Enthalten in Elsevier Miyata, Hugo Hissashi ELSEVIER An iterated greedy algorithm for distributed blocking flow shop with setup times and maintenance operations to minimize makespan 2022 (including Isotope geoscience) : official journal of the European Association for Geochemistry New York, NY [u.a.] (DE-627)ELV008354693 volume:417 year:2015 day:6 month:12 pages:200-209 extent:10 https://doi.org/10.1016/j.chemgeo.2015.10.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 85.35 Fertigung VZ 54.80 Angewandte Informatik VZ AR 417 2015 6 1206 200-209 10 045F 550 |
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10.1016/j.chemgeo.2015.10.003 doi GBVA2015020000005.pica (DE-627)ELV029275008 (ELSEVIER)S0009-2541(15)30050-4 DE-627 ger DE-627 rakwb eng 550 550 DE-600 004 VZ 85.35 bkl 54.80 bkl Newell, Dennis L. verfasserin aut Mantle-derived helium in hot springs of the Cordillera Blanca, Peru: Implications for mantle-to-crust fluid transfer in a flat-slab subduction setting 2015transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Jessup, Micah J. oth Hilton, David R. oth Shaw, Colin A. oth Hughes, Cameron A. oth Enthalten in Elsevier Miyata, Hugo Hissashi ELSEVIER An iterated greedy algorithm for distributed blocking flow shop with setup times and maintenance operations to minimize makespan 2022 (including Isotope geoscience) : official journal of the European Association for Geochemistry New York, NY [u.a.] (DE-627)ELV008354693 volume:417 year:2015 day:6 month:12 pages:200-209 extent:10 https://doi.org/10.1016/j.chemgeo.2015.10.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 85.35 Fertigung VZ 54.80 Angewandte Informatik VZ AR 417 2015 6 1206 200-209 10 045F 550 |
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10.1016/j.chemgeo.2015.10.003 doi GBVA2015020000005.pica (DE-627)ELV029275008 (ELSEVIER)S0009-2541(15)30050-4 DE-627 ger DE-627 rakwb eng 550 550 DE-600 004 VZ 85.35 bkl 54.80 bkl Newell, Dennis L. verfasserin aut Mantle-derived helium in hot springs of the Cordillera Blanca, Peru: Implications for mantle-to-crust fluid transfer in a flat-slab subduction setting 2015transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Jessup, Micah J. oth Hilton, David R. oth Shaw, Colin A. oth Hughes, Cameron A. oth Enthalten in Elsevier Miyata, Hugo Hissashi ELSEVIER An iterated greedy algorithm for distributed blocking flow shop with setup times and maintenance operations to minimize makespan 2022 (including Isotope geoscience) : official journal of the European Association for Geochemistry New York, NY [u.a.] (DE-627)ELV008354693 volume:417 year:2015 day:6 month:12 pages:200-209 extent:10 https://doi.org/10.1016/j.chemgeo.2015.10.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 85.35 Fertigung VZ 54.80 Angewandte Informatik VZ AR 417 2015 6 1206 200-209 10 045F 550 |
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10.1016/j.chemgeo.2015.10.003 doi GBVA2015020000005.pica (DE-627)ELV029275008 (ELSEVIER)S0009-2541(15)30050-4 DE-627 ger DE-627 rakwb eng 550 550 DE-600 004 VZ 85.35 bkl 54.80 bkl Newell, Dennis L. verfasserin aut Mantle-derived helium in hot springs of the Cordillera Blanca, Peru: Implications for mantle-to-crust fluid transfer in a flat-slab subduction setting 2015transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. Jessup, Micah J. oth Hilton, David R. oth Shaw, Colin A. oth Hughes, Cameron A. oth Enthalten in Elsevier Miyata, Hugo Hissashi ELSEVIER An iterated greedy algorithm for distributed blocking flow shop with setup times and maintenance operations to minimize makespan 2022 (including Isotope geoscience) : official journal of the European Association for Geochemistry New York, NY [u.a.] (DE-627)ELV008354693 volume:417 year:2015 day:6 month:12 pages:200-209 extent:10 https://doi.org/10.1016/j.chemgeo.2015.10.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 85.35 Fertigung VZ 54.80 Angewandte Informatik VZ AR 417 2015 6 1206 200-209 10 045F 550 |
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mantle-derived helium in hot springs of the cordillera blanca, peru: implications for mantle-to-crust fluid transfer in a flat-slab subduction setting |
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Mantle-derived helium in hot springs of the Cordillera Blanca, Peru: Implications for mantle-to-crust fluid transfer in a flat-slab subduction setting |
| abstract |
Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. |
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Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. |
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Fault-controlled hot springs in the Cordillera Blanca, Peru provide geochemical evidence of mantle-derived fluids in a modern flat-slab subduction setting. The Cordillera Blanca is an ~200km-long mountain range that contains the highest peaks in the Peruvian Andes, located in an amagmatic reach of the Andean arc. The Cordillera Blanca detachment defines the southwestern edge of the range and records a progression of top-down-to-the-west ductile shear to brittle normal faulting since ~5Ma. Hot springs, recording temperatures up to 78°C, issue along this fault zone and are CO2-rich, near neutral, alkaline-chloride to alkaline-carbonate waters, with elevated trace metal contents including arsenic (≤11ppm). Water δ18OSMOW (−14.2 to −4.9‰) and δDSMOW (−106.2 to −74.3‰), trends in elemental chemistry, and cation geothermometry collectively demonstrate mixing of hot (200–260°C) saline fluid with cold meteoric water along the fault. Helium isotope ratios (3He/4He) for dissolved gases in the waters range from 0.62 to 1.98 RA (where RA =air 3He/4He), indicating the presence of up to 25% mantle-derived helium. Given the long duration since, and large distance to active magmatism in the region, and the possible presence of a tear in the flat slab south of the Cordillera Blanca, we suggest that mantle helium may originate from asthenosphere entering the slab tear, or from the continental mantle-lithosphere, mobilized by metasomatic fluids derived from slab dehydration. |
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