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Neoproterozoic Crustal Reworking and Growth in the zhangbaling uplift, Tan-Lu Fault Zone: Evidence from the Feidong Complex and zhangbaling Group

引用

Acta Geologica Sinica(English Edition) 2020年第6期94卷 1921-1939页

作者： NIU Manlan CAI Qianru WU Qi YUAN Xiaoyu SUN Yi LI Xiucai LI Chen ZHU Guang LI Zhensheng ZHANG Shuai School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China

Intensive mid-Neoproterozoic magmatism is the salient feature of the Yangtze Block,preserving abundant information about crustal reworking and *** U-Pb-Lu-Hf isotope analysis was performed on material from the Feidong Complex(FDC)and zhangbaling Group(ZBLG)of the zhangbaling uplift,in order to determine the age and magmatic source of the Neoproterozoic igneous rocks as well as the detrital provenance for the sedimentary rocks,to further provide important data for understanding the mid-Neoproterozoic crustal evolution of the Northeast Yangtze *** amphibolite and gneissic granites in the Feidong Complex(FDC)gave similar protolith ages of 782-776 *** synmagmatic zircons exhibited variable negativeεHf(t)values of-26.9 ***(ca.2.4 Ga)to late Paleoproterozoic(ca.2.0-1.9 Ga)inherited zircons were found in the gneissic monzogranite,with negativeεHf(t)values of-11.2 to-7.2,indicating strong reworking of the ancient crustal materials of the Northeast Yangtze *** the amphibolites represent minor crustal growth through emplacement of continental rifting-related mafic *** quartz-keratophyres in the Xileng Formation of the ZBLG in contrast systematically yield young protolith crystallization ages of 754-727 Ma with highεHf(t)values of-2.0 to+5.6,indicating their derivation from the reworking of juvenile crustal *** detrital zircons from the metasiltstone in the Beijiangjun Formation yield variable^(206)Pb/^(238)U ages(871-644 Ma)with a peak age at 741±11 Ma andεHf(t)values of-4.3 to+5.3,which is consistent with those of the Xileng Formation,but distinct from the FDC,indicating that the provenance of the metasiltstone is primarily the underlying Xileng *** mid-Neoproterozoic igneous and sedimentary rocks of the zhangbaling uplift were products from continental rifting zones along the northern margin of the Yangtze Block,situated in different positions from the Susong Complex and the Haizhou *** transition from a

关键词： zircon U-Pb age Lu-Hf isotope crustal reworking Neoproterozoic magmatism zhangbaling uplift

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