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Mafic Archean continental crust prohibited exhumation of orogenic UHP eclogite

文献类型：期刊论文

作者Palin, Richard M.2; Moore, James D. P.3,6; Zhang, Zeming1; Huang, Guangyu5; Wade, Jon2; Dyck, Brendan4
刊名GEOSCIENCE FRONTIERS
出版日期2021-09-01
卷号12期号:5页码:10
关键词Archean Eclogite Exhumation Secular change Geodynamics Density
ISSN号1674-9871
DOI10.1016/j.gsf.2021.101225
英文摘要The absence of ultrahigh pressure (UHP) orogenic eclogite in the geological record older than c. 0.6 Ga is problematic for evidence of subduction having begun on Earth during the Archean (4.0-2.5 Ga). Many eclogites in Phanerozoic and Proterozoic terranes occur as mafic boudins encased within low-density felsic crust, which provides positive buoyancy during subduction; however, recent geochemical proxy analysis shows that Archean continental crust was more mafic than previously thought, having greater proportions of basalt and komatiite than modern-day continents. Here, we show via petrological modelling that secular change in the petrology and bulk composition of upper continental crust would make Archean continental terranes negatively buoyant in the mantle before reaching UHP conditions. Subducted or delaminated Archean continental crust passes a point of no return during metamorphism in the mantle prior to the stabilization of coesite, while Proterozoic and Phanerozoic terranes remain positively buoyant at these depths. UHP orogenic eclogite may thus readily have formed on the Archean Earth, but could not have been exhumed, weakening arguments for a Neoproterozoic onset of subduction and plate tectonics. Further, isostatic balance calculations for more mafic Archean continents indicate that the early Earth was covered by a global ocean over 1 km deep, corroborating independent isotopic evidence for large-scale emergence of the continents no earlier than c. 3 Ga. Our findings thus weaken arguments that early life on Earth likely emerged in shallow subaerial ponds, and instead support hypotheses involving development at hydrothermal vents in the deep ocean. (C) 2021 China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
WOS关键词PLATE-TECTONICS ; CHEMICAL-COMPOSITION ; OXIDATION-STATE ; SUBDUCTION ; EVOLUTION ; MANTLE ; TEMPERATURE ; EARTH ; METAMORPHISM ; CONSTRAINTS
资助项目Marsden grant, Royal Society of New Zealand[14-VUW-085]
WOS研究方向Geology
语种英语
WOS记录号WOS:000692319300029
出版者CHINA UNIV GEOSCIENCES, BEIJING
资助机构Marsden grant, Royal Society of New Zealand ; Marsden grant, Royal Society of New Zealand ; Marsden grant, Royal Society of New Zealand ; Marsden grant, Royal Society of New Zealand ; Marsden grant, Royal Society of New Zealand ; Marsden grant, Royal Society of New Zealand ; Marsden grant, Royal Society of New Zealand ; Marsden grant, Royal Society of New Zealand
源URL[http://ir.iggcas.ac.cn/handle/132A11/102647]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Palin, Richard M.
作者单位1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
2.Univ Oxford, Dept Earth Sci, Oxford OX1 3AN, England
3.Nanyang Technol Univ, Earth Observ Singapore, Singapore, Singapore
4.Univ British Columbia, Dept Earth Environm & Geog Sci, Kelowna, BC V1V 1V7, Canada
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.Victoria Univ Wellington, Inst Geophys, SGEES, Wellington, New Zealand
推荐引用方式
GB/T 7714		 Palin, Richard M.,Moore, James D. P.,Zhang, Zeming,et al. Mafic Archean continental crust prohibited exhumation of orogenic UHP eclogite[J]. GEOSCIENCE FRONTIERS,2021,12(5):10.
APA Palin, Richard M.,Moore, James D. P.,Zhang, Zeming,Huang, Guangyu,Wade, Jon,&Dyck, Brendan.(2021).Mafic Archean continental crust prohibited exhumation of orogenic UHP eclogite.GEOSCIENCE FRONTIERS,12(5),10.
MLA Palin, Richard M.,et al."Mafic Archean continental crust prohibited exhumation of orogenic UHP eclogite".GEOSCIENCE FRONTIERS 12.5(2021):10.

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来源：地质与地球物理研究所

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