First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil

Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<...
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Autor*in:	Yuri de Melo Portella [verfasserIn] Federica Zaccarini [verfasserIn] Giuseppe Etiope [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2019

Schlagwörter:	chromite catalysts Ni-sulfides Ni-Fe alloys abiotic methanogenesis serpentinization hydrogen chlorite geothermometry Pilar de Goiás greenstone belt

Übergeordnetes Werk:	In: Minerals - MDPI AG, 2012, 9(2019), 5, p 256
Übergeordnetes Werk:	volume:9 ; year:2019 ; number:5, p 256

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/min9050256

Katalog-ID:	DOAJ047036087

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allfields	10.3390/min9050256 doi (DE-627)DOAJ047036087 (DE-599)DOAJ7a3c7d4a50ce4c9781155312301893bb DE-627 ger DE-627 rakwb eng QE351-399.2 Yuri de Melo Portella verfasserin aut First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<sub<2</sub< hydrogenation. Here, we document, for the first time, the presence of methane within chromitites in South America. We analyzed, through milling and gas extraction, the content of gas occluded in Cedrolina chromitite samples, belonging to the Pilar de Goiás greenstone belt in Brazil. The chromitites display significant gas concentrations up to 0.31 µg CH<sub<4</sub</g<sub<rock</sub< and 2800 ppmv of hydrogen, while the host talc schist is devoid of gas. Stable C isotope composition of methane (δ<sup<13</sup<C from −30 to −39.2‰) and the absence of organic-matter rich metasediments in the region suggest an abiotic origin. Hydrogen and methane concentrations appear related to high-Cr chromite modal content and to the presence of Ni-sulfides/alloys, which are potential catalysts of CO<sub<2</sub< hydrogenation at temperatures above 200 °C. Accessory ruthenium-bearing minerals occurring in the chromitites could also act as catalysts, even at lower temperatures. Geothermometry of chlorite found in the chromitites constrains serpentinization at ~250 °C, during lower greenschist facies retrometamorphism. Hydrogen could be autochthonous, and thus formed under similar temperature, which we hypothesize represents the upper limit for abiotic methane generation in the area (250 °C). The Cedrolina chromitites are the first example of CH<sub<4</sub< occurrence in ultramafic rocks related to an Archean-Paleoproterozoic greenstone belt. This may imply that serpentinized Cr-rich chromitites could have been sources of methane for the early Earth’s atmosphere. chromite catalysts Ni-sulfides Ni-Fe alloys abiotic methanogenesis serpentinization hydrogen chlorite geothermometry Pilar de Goiás greenstone belt Mineralogy Federica Zaccarini verfasserin aut Giuseppe Etiope verfasserin aut In Minerals MDPI AG, 2012 9(2019), 5, p 256 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:9 year:2019 number:5, p 256 https://doi.org/10.3390/min9050256 kostenfrei https://doaj.org/article/7a3c7d4a50ce4c9781155312301893bb kostenfrei https://www.mdpi.com/2075-163X/9/5/256 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2019 5, p 256
spelling	10.3390/min9050256 doi (DE-627)DOAJ047036087 (DE-599)DOAJ7a3c7d4a50ce4c9781155312301893bb DE-627 ger DE-627 rakwb eng QE351-399.2 Yuri de Melo Portella verfasserin aut First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<sub<2</sub< hydrogenation. Here, we document, for the first time, the presence of methane within chromitites in South America. We analyzed, through milling and gas extraction, the content of gas occluded in Cedrolina chromitite samples, belonging to the Pilar de Goiás greenstone belt in Brazil. The chromitites display significant gas concentrations up to 0.31 µg CH<sub<4</sub</g<sub<rock</sub< and 2800 ppmv of hydrogen, while the host talc schist is devoid of gas. Stable C isotope composition of methane (δ<sup<13</sup<C from −30 to −39.2‰) and the absence of organic-matter rich metasediments in the region suggest an abiotic origin. Hydrogen and methane concentrations appear related to high-Cr chromite modal content and to the presence of Ni-sulfides/alloys, which are potential catalysts of CO<sub<2</sub< hydrogenation at temperatures above 200 °C. Accessory ruthenium-bearing minerals occurring in the chromitites could also act as catalysts, even at lower temperatures. Geothermometry of chlorite found in the chromitites constrains serpentinization at ~250 °C, during lower greenschist facies retrometamorphism. Hydrogen could be autochthonous, and thus formed under similar temperature, which we hypothesize represents the upper limit for abiotic methane generation in the area (250 °C). The Cedrolina chromitites are the first example of CH<sub<4</sub< occurrence in ultramafic rocks related to an Archean-Paleoproterozoic greenstone belt. This may imply that serpentinized Cr-rich chromitites could have been sources of methane for the early Earth’s atmosphere. chromite catalysts Ni-sulfides Ni-Fe alloys abiotic methanogenesis serpentinization hydrogen chlorite geothermometry Pilar de Goiás greenstone belt Mineralogy Federica Zaccarini verfasserin aut Giuseppe Etiope verfasserin aut In Minerals MDPI AG, 2012 9(2019), 5, p 256 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:9 year:2019 number:5, p 256 https://doi.org/10.3390/min9050256 kostenfrei https://doaj.org/article/7a3c7d4a50ce4c9781155312301893bb kostenfrei https://www.mdpi.com/2075-163X/9/5/256 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2019 5, p 256
allfields_unstemmed	10.3390/min9050256 doi (DE-627)DOAJ047036087 (DE-599)DOAJ7a3c7d4a50ce4c9781155312301893bb DE-627 ger DE-627 rakwb eng QE351-399.2 Yuri de Melo Portella verfasserin aut First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<sub<2</sub< hydrogenation. Here, we document, for the first time, the presence of methane within chromitites in South America. We analyzed, through milling and gas extraction, the content of gas occluded in Cedrolina chromitite samples, belonging to the Pilar de Goiás greenstone belt in Brazil. The chromitites display significant gas concentrations up to 0.31 µg CH<sub<4</sub</g<sub<rock</sub< and 2800 ppmv of hydrogen, while the host talc schist is devoid of gas. Stable C isotope composition of methane (δ<sup<13</sup<C from −30 to −39.2‰) and the absence of organic-matter rich metasediments in the region suggest an abiotic origin. Hydrogen and methane concentrations appear related to high-Cr chromite modal content and to the presence of Ni-sulfides/alloys, which are potential catalysts of CO<sub<2</sub< hydrogenation at temperatures above 200 °C. Accessory ruthenium-bearing minerals occurring in the chromitites could also act as catalysts, even at lower temperatures. Geothermometry of chlorite found in the chromitites constrains serpentinization at ~250 °C, during lower greenschist facies retrometamorphism. Hydrogen could be autochthonous, and thus formed under similar temperature, which we hypothesize represents the upper limit for abiotic methane generation in the area (250 °C). The Cedrolina chromitites are the first example of CH<sub<4</sub< occurrence in ultramafic rocks related to an Archean-Paleoproterozoic greenstone belt. This may imply that serpentinized Cr-rich chromitites could have been sources of methane for the early Earth’s atmosphere. chromite catalysts Ni-sulfides Ni-Fe alloys abiotic methanogenesis serpentinization hydrogen chlorite geothermometry Pilar de Goiás greenstone belt Mineralogy Federica Zaccarini verfasserin aut Giuseppe Etiope verfasserin aut In Minerals MDPI AG, 2012 9(2019), 5, p 256 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:9 year:2019 number:5, p 256 https://doi.org/10.3390/min9050256 kostenfrei https://doaj.org/article/7a3c7d4a50ce4c9781155312301893bb kostenfrei https://www.mdpi.com/2075-163X/9/5/256 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2019 5, p 256
allfieldsGer	10.3390/min9050256 doi (DE-627)DOAJ047036087 (DE-599)DOAJ7a3c7d4a50ce4c9781155312301893bb DE-627 ger DE-627 rakwb eng QE351-399.2 Yuri de Melo Portella verfasserin aut First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<sub<2</sub< hydrogenation. Here, we document, for the first time, the presence of methane within chromitites in South America. We analyzed, through milling and gas extraction, the content of gas occluded in Cedrolina chromitite samples, belonging to the Pilar de Goiás greenstone belt in Brazil. The chromitites display significant gas concentrations up to 0.31 µg CH<sub<4</sub</g<sub<rock</sub< and 2800 ppmv of hydrogen, while the host talc schist is devoid of gas. Stable C isotope composition of methane (δ<sup<13</sup<C from −30 to −39.2‰) and the absence of organic-matter rich metasediments in the region suggest an abiotic origin. Hydrogen and methane concentrations appear related to high-Cr chromite modal content and to the presence of Ni-sulfides/alloys, which are potential catalysts of CO<sub<2</sub< hydrogenation at temperatures above 200 °C. Accessory ruthenium-bearing minerals occurring in the chromitites could also act as catalysts, even at lower temperatures. Geothermometry of chlorite found in the chromitites constrains serpentinization at ~250 °C, during lower greenschist facies retrometamorphism. Hydrogen could be autochthonous, and thus formed under similar temperature, which we hypothesize represents the upper limit for abiotic methane generation in the area (250 °C). The Cedrolina chromitites are the first example of CH<sub<4</sub< occurrence in ultramafic rocks related to an Archean-Paleoproterozoic greenstone belt. This may imply that serpentinized Cr-rich chromitites could have been sources of methane for the early Earth’s atmosphere. chromite catalysts Ni-sulfides Ni-Fe alloys abiotic methanogenesis serpentinization hydrogen chlorite geothermometry Pilar de Goiás greenstone belt Mineralogy Federica Zaccarini verfasserin aut Giuseppe Etiope verfasserin aut In Minerals MDPI AG, 2012 9(2019), 5, p 256 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:9 year:2019 number:5, p 256 https://doi.org/10.3390/min9050256 kostenfrei https://doaj.org/article/7a3c7d4a50ce4c9781155312301893bb kostenfrei https://www.mdpi.com/2075-163X/9/5/256 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2019 5, p 256
allfieldsSound	10.3390/min9050256 doi (DE-627)DOAJ047036087 (DE-599)DOAJ7a3c7d4a50ce4c9781155312301893bb DE-627 ger DE-627 rakwb eng QE351-399.2 Yuri de Melo Portella verfasserin aut First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<sub<2</sub< hydrogenation. Here, we document, for the first time, the presence of methane within chromitites in South America. We analyzed, through milling and gas extraction, the content of gas occluded in Cedrolina chromitite samples, belonging to the Pilar de Goiás greenstone belt in Brazil. The chromitites display significant gas concentrations up to 0.31 µg CH<sub<4</sub</g<sub<rock</sub< and 2800 ppmv of hydrogen, while the host talc schist is devoid of gas. Stable C isotope composition of methane (δ<sup<13</sup<C from −30 to −39.2‰) and the absence of organic-matter rich metasediments in the region suggest an abiotic origin. Hydrogen and methane concentrations appear related to high-Cr chromite modal content and to the presence of Ni-sulfides/alloys, which are potential catalysts of CO<sub<2</sub< hydrogenation at temperatures above 200 °C. Accessory ruthenium-bearing minerals occurring in the chromitites could also act as catalysts, even at lower temperatures. Geothermometry of chlorite found in the chromitites constrains serpentinization at ~250 °C, during lower greenschist facies retrometamorphism. Hydrogen could be autochthonous, and thus formed under similar temperature, which we hypothesize represents the upper limit for abiotic methane generation in the area (250 °C). The Cedrolina chromitites are the first example of CH<sub<4</sub< occurrence in ultramafic rocks related to an Archean-Paleoproterozoic greenstone belt. This may imply that serpentinized Cr-rich chromitites could have been sources of methane for the early Earth’s atmosphere. chromite catalysts Ni-sulfides Ni-Fe alloys abiotic methanogenesis serpentinization hydrogen chlorite geothermometry Pilar de Goiás greenstone belt Mineralogy Federica Zaccarini verfasserin aut Giuseppe Etiope verfasserin aut In Minerals MDPI AG, 2012 9(2019), 5, p 256 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:9 year:2019 number:5, p 256 https://doi.org/10.3390/min9050256 kostenfrei https://doaj.org/article/7a3c7d4a50ce4c9781155312301893bb kostenfrei https://www.mdpi.com/2075-163X/9/5/256 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2019 5, p 256
language	English
source	In Minerals 9(2019), 5, p 256 volume:9 year:2019 number:5, p 256
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topic_facet	chromite catalysts Ni-sulfides Ni-Fe alloys abiotic methanogenesis serpentinization hydrogen chlorite geothermometry Pilar de Goiás greenstone belt Mineralogy
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authorswithroles_txt_mv	Yuri de Melo Portella @@aut@@ Federica Zaccarini @@aut@@ Giuseppe Etiope @@aut@@
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topic_title	QE351-399.2 First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil chromite catalysts Ni-sulfides Ni-Fe alloys abiotic methanogenesis serpentinization hydrogen chlorite geothermometry Pilar de Goiás greenstone belt
topic	misc QE351-399.2 misc chromite misc catalysts misc Ni-sulfides misc Ni-Fe alloys misc abiotic methanogenesis misc serpentinization misc hydrogen misc chlorite geothermometry misc Pilar de Goiás greenstone belt misc Mineralogy
topic_unstemmed	misc QE351-399.2 misc chromite misc catalysts misc Ni-sulfides misc Ni-Fe alloys misc abiotic methanogenesis misc serpentinization misc hydrogen misc chlorite geothermometry misc Pilar de Goiás greenstone belt misc Mineralogy
topic_browse	misc QE351-399.2 misc chromite misc catalysts misc Ni-sulfides misc Ni-Fe alloys misc abiotic methanogenesis misc serpentinization misc hydrogen misc chlorite geothermometry misc Pilar de Goiás greenstone belt misc Mineralogy
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title	First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil
ctrlnum	(DE-627)DOAJ047036087 (DE-599)DOAJ7a3c7d4a50ce4c9781155312301893bb
title_full	First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil
author_sort	Yuri de Melo Portella
journal	Minerals
journalStr	Minerals
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author_browse	Yuri de Melo Portella Federica Zaccarini Giuseppe Etiope
container_volume	9
class	QE351-399.2
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author-letter	Yuri de Melo Portella
doi_str_mv	10.3390/min9050256
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title_sort	first detection of methane within chromitites of an archean-paleoproterozoic greenstone belt in brazil
callnumber	QE351-399.2
title_auth	First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil
abstract	Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<sub<2</sub< hydrogenation. Here, we document, for the first time, the presence of methane within chromitites in South America. We analyzed, through milling and gas extraction, the content of gas occluded in Cedrolina chromitite samples, belonging to the Pilar de Goiás greenstone belt in Brazil. The chromitites display significant gas concentrations up to 0.31 µg CH<sub<4</sub</g<sub<rock</sub< and 2800 ppmv of hydrogen, while the host talc schist is devoid of gas. Stable C isotope composition of methane (δ<sup<13</sup<C from −30 to −39.2‰) and the absence of organic-matter rich metasediments in the region suggest an abiotic origin. Hydrogen and methane concentrations appear related to high-Cr chromite modal content and to the presence of Ni-sulfides/alloys, which are potential catalysts of CO<sub<2</sub< hydrogenation at temperatures above 200 °C. Accessory ruthenium-bearing minerals occurring in the chromitites could also act as catalysts, even at lower temperatures. Geothermometry of chlorite found in the chromitites constrains serpentinization at ~250 °C, during lower greenschist facies retrometamorphism. Hydrogen could be autochthonous, and thus formed under similar temperature, which we hypothesize represents the upper limit for abiotic methane generation in the area (250 °C). The Cedrolina chromitites are the first example of CH<sub<4</sub< occurrence in ultramafic rocks related to an Archean-Paleoproterozoic greenstone belt. This may imply that serpentinized Cr-rich chromitites could have been sources of methane for the early Earth’s atmosphere.
abstractGer	Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<sub<2</sub< hydrogenation. Here, we document, for the first time, the presence of methane within chromitites in South America. We analyzed, through milling and gas extraction, the content of gas occluded in Cedrolina chromitite samples, belonging to the Pilar de Goiás greenstone belt in Brazil. The chromitites display significant gas concentrations up to 0.31 µg CH<sub<4</sub</g<sub<rock</sub< and 2800 ppmv of hydrogen, while the host talc schist is devoid of gas. Stable C isotope composition of methane (δ<sup<13</sup<C from −30 to −39.2‰) and the absence of organic-matter rich metasediments in the region suggest an abiotic origin. Hydrogen and methane concentrations appear related to high-Cr chromite modal content and to the presence of Ni-sulfides/alloys, which are potential catalysts of CO<sub<2</sub< hydrogenation at temperatures above 200 °C. Accessory ruthenium-bearing minerals occurring in the chromitites could also act as catalysts, even at lower temperatures. Geothermometry of chlorite found in the chromitites constrains serpentinization at ~250 °C, during lower greenschist facies retrometamorphism. Hydrogen could be autochthonous, and thus formed under similar temperature, which we hypothesize represents the upper limit for abiotic methane generation in the area (250 °C). The Cedrolina chromitites are the first example of CH<sub<4</sub< occurrence in ultramafic rocks related to an Archean-Paleoproterozoic greenstone belt. This may imply that serpentinized Cr-rich chromitites could have been sources of methane for the early Earth’s atmosphere.
abstract_unstemmed	Abiotic methane is widely documented in seeps, springs and aquifers associated with mafic-ultramafic rocks in Phanerozoic ophiolites, peridotite massifs and intrusions worldwide. Chromitites in ophiolites, in particular, have been interpreted as the rocks potentially generating methane though CO<sub<2</sub< hydrogenation. Here, we document, for the first time, the presence of methane within chromitites in South America. We analyzed, through milling and gas extraction, the content of gas occluded in Cedrolina chromitite samples, belonging to the Pilar de Goiás greenstone belt in Brazil. The chromitites display significant gas concentrations up to 0.31 µg CH<sub<4</sub</g<sub<rock</sub< and 2800 ppmv of hydrogen, while the host talc schist is devoid of gas. Stable C isotope composition of methane (δ<sup<13</sup<C from −30 to −39.2‰) and the absence of organic-matter rich metasediments in the region suggest an abiotic origin. Hydrogen and methane concentrations appear related to high-Cr chromite modal content and to the presence of Ni-sulfides/alloys, which are potential catalysts of CO<sub<2</sub< hydrogenation at temperatures above 200 °C. Accessory ruthenium-bearing minerals occurring in the chromitites could also act as catalysts, even at lower temperatures. Geothermometry of chlorite found in the chromitites constrains serpentinization at ~250 °C, during lower greenschist facies retrometamorphism. Hydrogen could be autochthonous, and thus formed under similar temperature, which we hypothesize represents the upper limit for abiotic methane generation in the area (250 °C). The Cedrolina chromitites are the first example of CH<sub<4</sub< occurrence in ultramafic rocks related to an Archean-Paleoproterozoic greenstone belt. This may imply that serpentinized Cr-rich chromitites could have been sources of methane for the early Earth’s atmosphere.
collection_details	GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700
container_issue	5, p 256
title_short	First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil
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First Detection of Methane within Chromitites of an Archean-Paleoproterozoic Greenstone Belt in Brazil

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