Thermal evolution of the lower crust beneath the Transantarctic Mountains

Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Apen, Francisco E. [verfasserIn] Cottle, John M. [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Lower crust Antarctica Petrochronology Xenoliths Heat flow

Übergeordnetes Werk:	Enthalten in: Chemical geology - New York, NY [u.a.] : Elsevier, 1966, 631
Übergeordnetes Werk:	volume:631

DOI / URN:	10.1016/j.chemgeo.2023.121504

Katalog-ID:	ELV009810404

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245	1	0	\|a Thermal evolution of the lower crust beneath the Transantarctic Mountains
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520			\|a Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic.
650		4	\|a Lower crust
650		4	\|a Antarctica
650		4	\|a Petrochronology
650		4	\|a Xenoliths
650		4	\|a Heat flow
700	1		\|a Cottle, John M. \|e verfasserin \|4 aut
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allfields	10.1016/j.chemgeo.2023.121504 doi (DE-627)ELV009810404 (ELSEVIER)S0009-2541(23)00204-8 DE-627 ger DE-627 rda eng 550 VZ 38.32 bkl Apen, Francisco E. verfasserin aut Thermal evolution of the lower crust beneath the Transantarctic Mountains 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic. Lower crust Antarctica Petrochronology Xenoliths Heat flow Cottle, John M. verfasserin aut Enthalten in Chemical geology New York, NY [u.a.] : Elsevier, 1966 631 Online-Ressource (DE-627)302724389 (DE-600)1492506-0 (DE-576)08195283X 0009-2541 nnns volume:631 GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.32 Geochemie VZ AR 631
spelling	10.1016/j.chemgeo.2023.121504 doi (DE-627)ELV009810404 (ELSEVIER)S0009-2541(23)00204-8 DE-627 ger DE-627 rda eng 550 VZ 38.32 bkl Apen, Francisco E. verfasserin aut Thermal evolution of the lower crust beneath the Transantarctic Mountains 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic. Lower crust Antarctica Petrochronology Xenoliths Heat flow Cottle, John M. verfasserin aut Enthalten in Chemical geology New York, NY [u.a.] : Elsevier, 1966 631 Online-Ressource (DE-627)302724389 (DE-600)1492506-0 (DE-576)08195283X 0009-2541 nnns volume:631 GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.32 Geochemie VZ AR 631
allfields_unstemmed	10.1016/j.chemgeo.2023.121504 doi (DE-627)ELV009810404 (ELSEVIER)S0009-2541(23)00204-8 DE-627 ger DE-627 rda eng 550 VZ 38.32 bkl Apen, Francisco E. verfasserin aut Thermal evolution of the lower crust beneath the Transantarctic Mountains 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic. Lower crust Antarctica Petrochronology Xenoliths Heat flow Cottle, John M. verfasserin aut Enthalten in Chemical geology New York, NY [u.a.] : Elsevier, 1966 631 Online-Ressource (DE-627)302724389 (DE-600)1492506-0 (DE-576)08195283X 0009-2541 nnns volume:631 GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.32 Geochemie VZ AR 631
allfieldsGer	10.1016/j.chemgeo.2023.121504 doi (DE-627)ELV009810404 (ELSEVIER)S0009-2541(23)00204-8 DE-627 ger DE-627 rda eng 550 VZ 38.32 bkl Apen, Francisco E. verfasserin aut Thermal evolution of the lower crust beneath the Transantarctic Mountains 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic. Lower crust Antarctica Petrochronology Xenoliths Heat flow Cottle, John M. verfasserin aut Enthalten in Chemical geology New York, NY [u.a.] : Elsevier, 1966 631 Online-Ressource (DE-627)302724389 (DE-600)1492506-0 (DE-576)08195283X 0009-2541 nnns volume:631 GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.32 Geochemie VZ AR 631
allfieldsSound	10.1016/j.chemgeo.2023.121504 doi (DE-627)ELV009810404 (ELSEVIER)S0009-2541(23)00204-8 DE-627 ger DE-627 rda eng 550 VZ 38.32 bkl Apen, Francisco E. verfasserin aut Thermal evolution of the lower crust beneath the Transantarctic Mountains 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic. Lower crust Antarctica Petrochronology Xenoliths Heat flow Cottle, John M. verfasserin aut Enthalten in Chemical geology New York, NY [u.a.] : Elsevier, 1966 631 Online-Ressource (DE-627)302724389 (DE-600)1492506-0 (DE-576)08195283X 0009-2541 nnns volume:631 GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.32 Geochemie VZ AR 631
language	English
source	Enthalten in Chemical geology 631 volume:631
sourceStr	Enthalten in Chemical geology 631 volume:631
format_phy_str_mv	Article
bklname	Geochemie
institution	findex.gbv.de
topic_facet	Lower crust Antarctica Petrochronology Xenoliths Heat flow
dewey-raw	550
isfreeaccess_bool	false
container_title	Chemical geology
authorswithroles_txt_mv	Apen, Francisco E. @@aut@@ Cottle, John M. @@aut@@
publishDateDaySort_date	2023-01-01T00:00:00Z
hierarchy_top_id	302724389
dewey-sort	3550
id	ELV009810404
language_de	englisch
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author	Apen, Francisco E.
spellingShingle	Apen, Francisco E. ddc 550 bkl 38.32 misc Lower crust misc Antarctica misc Petrochronology misc Xenoliths misc Heat flow Thermal evolution of the lower crust beneath the Transantarctic Mountains
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topic_title	550 VZ 38.32 bkl Thermal evolution of the lower crust beneath the Transantarctic Mountains Lower crust Antarctica Petrochronology Xenoliths Heat flow
topic	ddc 550 bkl 38.32 misc Lower crust misc Antarctica misc Petrochronology misc Xenoliths misc Heat flow
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title	Thermal evolution of the lower crust beneath the Transantarctic Mountains
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title_full	Thermal evolution of the lower crust beneath the Transantarctic Mountains
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title_sort	thermal evolution of the lower crust beneath the transantarctic mountains
title_auth	Thermal evolution of the lower crust beneath the Transantarctic Mountains
abstract	Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic.
abstractGer	Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic.
abstract_unstemmed	Models of uplift, rifting, and heat transfer in the Transantarctic Mountains (TAM) rely on knowledge of the thermal evolution of the lower crust, but such information has remained elusive. Granulite xenoliths entrained in <2 Ma rift basalts at the TAM front chronicle the long-term thermal history of the deep crust and yield insight into the Cenozoic evolution of the TAM. Major-element thermobarometry of the xenoliths record elevated temperatures of 860–920 °C at ∼0.8 GPa. In situ coupled U-Pb and trace element zircon and titanite data reveal that the deep crust experienced intense heating at least twice: once at 850–900 °C ca. 500 Ma and again at 740–900 °C starting ca. 37 Ma. The Cenozoic temperature-time path indicates a high geothermal gradient beneath the TAM front—with 800–900 °C at 20–30 km depth and 900–1000 °C temperatures at the Moho (30–35 km depth)—and is interpreted to reflect heating by the adjacent West Antarctic Rift System. Despite elevated temperatures in the lower crust, minimal melting beneath the present-day TAM is inferred given that the crust is refractory, having been previously depleted during Ordovician magmatism. The identification of hot crust beneath the TAM forces revisions to estimates of the elastic thickness of the lithosphere, which underpin models invoking a flexural origin for the high elevations of the TAM. The observed Cenozoic heating trend supports models that suggest uplift was driven by a buoyant thermal anomaly beneath the TAM front. The finding of dry and strong deep crust is also in line with models wherein the TAM have maintained high elevations since the Mesozoic.
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title_short	Thermal evolution of the lower crust beneath the Transantarctic Mountains
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Thermal evolution of the lower crust beneath the Transantarctic Mountains

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Zugang & Verfügbarkeit

Vorhandene Bände

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