东天山觉罗塔格带东段早志留世中酸性侵入岩的年代学、地球化学及构造意义

doi:10.13278/j.cnki.jjuese.20180240

Abstract

Abstract: In order to ascertain the formation age, source and tectonic properties of the intermediate-acid intrusive rocks in the Yuhai area of the eastern Jueluotage belt in the eastern Tianshan, this paper systematically presents LA-ICP-MS zircon U-Pb geochronology, whole rock geochemistry and Sr-Nd isotopes data of the rocks in this area. The selected zircons of two samples show obvious oscillation zoning in cathodoluminescence (CL) images, and have Th/U value of 0.28-0.59, indicating a magmatic origin. The zircon U-Pb dates indicate that they formed in the Early Silurian of (433.2-431.2) Ma, representing the emplacement age of these host rocks. These samples have w(SiO₂)=57.88%-69.01%,w(Na₂O)=3.46%-5.07%,w(K₂O)=0.50%-1.65%,Na₂O/K₂O=4.26-6.79,Mg^#=45.1-52.3,and A/CNK=0.89-1.00; the rare earth element distribution patterns are right-slipped, LREE/HREE=5.55-11.47,(La/Yb)_N=4.18-13.54,and δEu=0.82-1.25;the trace element spider diagrams show that they are enriched in LILE (Ba, U, K and Sr), moderately depleted of HFSE (Th, Ti, Nb and Ta); the value of ε_Nd(t) of the whole rock is between 6.1 and 7.0. The study shows that the magma source of the intermediate-acid intrusive rocks in the Early Silurian is mainly young crustal material. Combining with the characteristics of igneous rock association, magmatism and regional tectonic evolution history, it is considered that the intermediate-acid intrusive rocks of the Early Silurian were formed in the active continental margin environment under the northward subduction of the Kanggur Ocean plate (Turpan-Hami block). Thus, the time of the Kanggur plate subduction can be traced back to the Early Silurian.

Key words: eastern part of Jueluotage belt, Eastern Tianshan, Early Silurian, intermediate-acid intrusive rocks, geochronology, geochemistry, tectonic implications

CLC Number:

P588.12

Yu Jielu, Yu Jiejiang, Yang Wanzhi, Zhang Yuanhou, Guo Xiuwei. Geochronology, Geochemistry and Tectonic Implications of Early Silurian Intermediate-Acid Intrusive Rocks in East of Jueluotage Belt, Eastern Tianshan[J].Journal of Jilin University(Earth Science Edition), 2019, 49(3): 690-708.

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Geochronology, Geochemistry and Tectonic Implications of Early Silurian Intermediate-Acid Intrusive Rocks in East of Jueluotage Belt, Eastern Tianshan

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