Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/111977
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dc.contributor.authorLiao, F.en
dc.contributor.authorWang, Q.en
dc.contributor.authorChen, N.en
dc.contributor.authorSantosh, M.en
dc.contributor.authorXu, Y.en
dc.contributor.authorMustafa, H.en
dc.date.issued2018en
dc.identifier.citationJournal of Asian Earth Sciences, 2018; 157:3-21en
dc.identifier.issn1367-9120en
dc.identifier.issn1878-5786en
dc.identifier.urihttp://hdl.handle.net/2440/111977-
dc.description.abstractThe role of the Tarim Block in the reconstruction of the Neoproterozoic supercontinent Rodinia remains contentious. Here we report a suite of high–Mg gabbroic dykes from the Yingfeng area in northwestern Quanji Massif, which is considered as a fragment of the Tarim Block in NW China. Magmatic zircons from these dykes yield to have a weighted mean 206Pb/238U age of 822.2 ± 5.3 Ma, recording the timing of their emplacement. The gabbros have high MgO (9.91–13.09 wt%), Mg numbers (69.89–75.73) and CaO (8.41–13.55 wt%), medium FeOt (8.50–9.67 wt%) and TiO2 (0.67–0.93 wt%), variable Al2O3 (13.04–16.07 wt%), and high Cr (346.14–675.25 ppm), but relatively low Ni (138.72–212.94 ppm), suggestive of derivation from a primary magma. The rocks display chondrite-normalized LREE patterns with weak fractionation but flat HREE patterns relative to those of the N-MORB. Their primitive mantle normalized trace elemental patterns show positive Rb, Ba and U but negative Th, Nb, Ti and Zr anomalies, carrying characteristics of both mid-ocean ridge basalts and arc basalts. The εHf(t) values of the zircons from these rocks vary from +4.7 to +13.5 with depleted mantle model ages (TDM) of 1.23–0.85 Ga, and the youngest value nearly approaching that for the coeval depleted mantle, suggesting significant addition of juvenile materials. Our data suggest that the strongly depleted basaltic magma was probably sourced from a depleted mantle source that had undergone metasomatism by subduction–related components in a back-arc setting. Accordingly we postulate that a subduction–related tectonic regime possibly prevailed at ∼0.8 Ga along the southeastern margin of the Tarim Block. Combining with available information from the northern Tarim Block, we propose an opposite verging double–sided subduction model for coeval subduction of the oceanic crust beneath both the southern and northern margins of the Tarim Block during early Neoproterozoic.en
dc.description.statementofresponsibilityFanxi Liaoa, Qinyan Wang, Nengsong Chen, M. Santosh, Yixian Xu, Hassan Abdelsalam Mustafaen
dc.language.isoenen
dc.publisherPERGAMON-ELSEVIER SCIENCE LTDen
dc.rights© 2017 Elsevier Ltd. All rights reserved.en
dc.subjectHigh–Mg gabbroic dykes; geochemistry and geochronology; double–sided subduction; Northwest China; supercontinent Rodiniaen
dc.titleGeochemistry and geochronology of the ∼0.82Ga high-Mg gabbroic dykes from the Quanji Massif, southeast Tarim Block, NW China: implications for the Rodinia supercontinent assemblyen
dc.typeJournal articleen
dc.identifier.rmid0030072909en
dc.identifier.doi10.1016/j.jseaes.2017.06.021en
dc.identifier.pubid362399-
pubs.library.collectionGeology & Geophysics publicationsen
pubs.library.teamDS10en
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidSantosh, M. [0000-0002-1073-8477]en
Appears in Collections:Geology & Geophysics publications

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