Geochronology and geochemistry of Early Mesoproterozoic meta-diabase sills from Quruqtagh in the northeastern Tarim Craton: Implications for breakup of the Columbia supercontinent

Metadiabase sills are extensively distributed in the Astingbulake region in the central Quruqtagh block of the NE Tarim Craton. Here we report laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon U-Pb ages and Hf isotopes, as well as whole rock elemental and Sr-Nd isotopic...

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Bibliographic Details
Published in:Precambrian Research
Main Authors: Wu, Chang-Zhi, Santosh, M., Chen, Yan-Jing, Samson, Lain M., Lei, Ru-Xiong, Dong, Lian-Hui, Qu, Xun, Gu, Lian-Xing
Other Authors: Wu, CZ (reprint author), Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 270093, Jiangsu, Peoples R China., Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 270093, Jiangsu, Peoples R China., Univ Windsor, Dept Earth & Environm Sci, Windsor, ON N9B 3P4, Canada., China Univ Geosc, Sch Earth Sci & Resources, Beijing 100083, Peoples R China., Peking Univ, Key Lab Crustal & Orogen Evolut, Beijing 100871, Peoples R China., Changan Univ, Sch Earth Sci Resources, Key Lab Western Chinas Mineral Resources & Geol E, Xian 710054, Peoples R China., Xinjiang Bur Geol & Mineral Resources, Urumqi 830000, Xinjiang, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: precambrian research 2014
Subjects:
LA-ICP-MS U-Pb zircon geochronology
Meta-diabase
Mesoproterozoic
Columbia supercontinent
Tarim Craton
ZIRCON U-PB
NORTH CHINA CRATON
PRE-RODINIA SUPERCONTINENT
TRACE-ELEMENT ANALYSES
ND ISOTOPIC EVIDENCE
NW CHINA
VOLCANIC-ROCKS
TECTONIC IMPLICATIONS
MANTLE SOURCES
WESTERN CHINA
Ocean Island
Siberia
Online Access:https://hdl.handle.net/20.500.11897/216252
https://doi.org/10.1016/j.precamres.2013.11.007
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Summary:Metadiabase sills are extensively distributed in the Astingbulake region in the central Quruqtagh block of the NE Tarim Craton. Here we report laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon U-Pb ages and Hf isotopes, as well as whole rock elemental and Sr-Nd isotopic data for these Mesoproterozoic sills. Zircons from one of the mafic sills yield an emplacement age of 1470 +/- 9 Ma (95% confidence, MSWD = 3.2, n = 23) Ma. Despite the greenschist-amphibolite fades metamorphism, most of the immobile elements provide important clues for the petrogenesis and tectonic settings of these rocks. Except for their variable fluid mobile-element contents, all the studied samples show enrichment in incompatible trace elements with no obvious Nb-Ta depletion, similar to the features of continental flood basalts and ocean island basalts (OM). Combined with their relative higher Sr-87/Sr-86 (t) ratios (0.70666 to 0.70784), negative sNd(t) (-4.30 to -3.96) and epsilon Hf (t) (-5.49 to -1.13) values, we propose that the protolithic magmas were derived from the high degree partial melting of enriched continental lithospheric mantle within continental rifting settings. The similar to 1.5 Ga diabase sills from North Tarim corresponded to the major episode of mafic magmatism during Early Mesoproterozoic time identified from other crustal fragments of Laurentia, Siberia, Greater Congo and South China, and probably belong to one of the three major large igneous provinces associated with the breakup of the Mesoproterozoic Columbia supercontinent. Our data provide important constraints on the configuration of the Tarim Craton within the Columbia supercontinent (C) 2013 Elsevier B.V. All rights reserved. Geosciences, Multidisciplinary SCI(E) 2 ARTICLE wucz@nju.edu.cn 29-43 241

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