globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.09.015
Scopus记录号: 2-s2.0-85054187135
论文题名:
Hydrothermally-altered mafic crust as source for early Earth TTG: Pb/Hf/O isotope and trace element evidence in zircon from TTG of the Eoarchean Saglek Block, N. Labrador
作者: Vezinet A.; Pearson D.G.; Thomassot E.; Stern R.A.; Sarkar C.; Luo Y.; Fisher C.M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 503
起始页码: 95
结束页码: 107
语种: 英语
英文关键词: Early Earth ; Eoarchean Saglek Block ; low-T alteration ; zircon trace element ; zircon U–Pb/Hf/O isotope
Scopus关键词: Hafnium ; Isotopes ; Melting ; Silicate minerals ; Temperature ; Zircon ; Analytical method ; Early Earth ; Eoarchean Saglek Block ; Gneiss complexes ; In-situ analysis ; Low temperatures ; low-T alteration ; Oxygen isotope ratios ; Trace elements
英文摘要: The North Atlantic craton hosts extensive exposures of Eoarchean crust, spread through areas of Western Greenland and Northern Labrador (Canada). Of these two areas, the crust of the Saglek Block of Northern Labrador has received far less attention from the scrutiny of modern analytical methods than its better documented Western Greenland equivalent, the Itsaq Gneiss Complex. Here, we present the first coupled trace element and U–Pb/Hf/O isotope dataset for zircon from an early TTG component of the Saglek Block. The combination of textural, elemental and isotopic in-situ analyses enables selection of the least disturbed zircon domains. From these it is demonstrated that the oldest felsic remnants exposed in the Saglek Block were emplaced 3.86 ± 0.01 billion yr (Ga) ago through partial melting of basaltic protoliths. The Hf isotope signature of the oldest zircon domains from the Saglek Block TTG indicates derivation from sources that did not undergo substantial Lu/Hf fractionation, resulting in initial Hf isotope compositions that are chondritic within uncertainty. The oxygen isotope ratios of the least disturbed zircon portions vary from 5.38 ± 0.16‰ to 6.64 ± 0.19‰ and document the interaction of the TTG protoliths with Earth's early hydrosphere at low temperature (≤150–200 °C) prior partial melting in the Eoarchean. The results support TTG production in the Eoarchean from variably hydrated basaltic protoliths. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109614
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada; Centre de Recherches Pétrographiques et Géochimiques, Université de Lorraine, Vandoeuvre-Lès-Nancy, 54501, France; Institute for Geochemistry and Petrology, ETH Zürich, Clausiusstrasse 25, Zürich, 8038, Switzerland; Canadian Centre for Isotopic Microanalysis, University of AlbertaT6G 2E3, Canada

Recommended Citation:
Vezinet A.,Pearson D.G.,Thomassot E.,et al. Hydrothermally-altered mafic crust as source for early Earth TTG: Pb/Hf/O isotope and trace element evidence in zircon from TTG of the Eoarchean Saglek Block, N. Labrador[J]. Earth and Planetary Science Letters,2018-01-01,503
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