临沧花岗质岩基早古生代花岗岩的岩石成因及其构造意义:来自年代学、地球化学和Hf同位素的约束

Qian R. Xiao , Qiang Wang , Zhong Y. Liu , Fu H. Xiong , Lei Fan , Han Zhao , Ting T. Gong
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摘要

本文介绍了临沧花岗岩基中新近发现的五老山奥陶世花岗岩,探讨了其地球化学亲和性、成因及构造意义,并对滇西南原特提斯造山模式进行了解释。LA-ICP-MS锆石U-Pb分析表明,五老山片麻岩的结晶年龄为473.0±2.9Ma。地球化学分析表明,五老山花岗岩表现出相对较高的SiO2浓度(73.4–77.3wt.%)、较强的过铝性质(ASI>;1.1)、强烈的Eu负异常、轻稀土和重稀土分馏以及相对的Ba、Nb、Ta、Sr、P和Ti贫化。SiO2和P2O5呈强负相关,而Rb和Y-Th呈正相关。岩浆锆石的εHf(t)值为-5.47~2.74。岩石学观察和全岩地球化学及同位素分析表明,五老山花岗岩不含堇青石等富铝矿物,这表明五老山岩体是一种高度分馏的高温I型花岗岩,可能是由镁铁火成岩地壳部分熔融形成的。此外,花岗岩样品中的钾长石、斜长石和黑云母可能经历了强烈的分级结晶。五老山片麻质花岗岩为与俯冲有关的弧形花岗岩,表明临沧地块经历了原特提斯俯冲。这一发现为原特提斯向临沧-思茅地块俯冲提供了证据,进一步支持了原特提斯的双向俯冲模式。
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Petrogenesis and tectonic implications of the early Paleozoic granites in the Lincang granitic batholith, southwestern China: Constraints from geochronology, geochemistry and Hf isotopes

This study presents the recently discovered Wulao Shan Ordovician granite within the Lincang granitic batholith, discusses its geochemical affinity, genesis, and tectonic significance, and interprets the proto-Tethys orogenic model in southwest Yunnan. LA-ICP-MS zircon U-Pb analyses indicate a crystalline age of 473.0 ± 2.9 Ma for the Wulaoshan gneissic granite. Geochemical analyses show that the Wulaoshan granite exhibits relatively high SiO2 concentrations (73.4–77.3 wt.%), strong peraluminous properties (ASI > 1.1), strongly Eu-negative anomalies, light and heavy rare earth fractionation, and relative Ba, Nb, Ta, Sr, P, and Ti depletion. SiO2 and P2O5 exhibit a strong negative correlation, whereas Rb and Y-Th with a positive correlation. The magmatic zircons have negative εHf(t) values of -5.47∼2.74. Petrographic observations and whole-rock geochemical and isotopic analyses imply no aluminum-rich minerals such as cordierite, indicating that the Wulaoshan granite is a highly fractionated, high-temperature I-type granite, which may have formed via partial melting of the magnesian-iron igneous crust. Additionally, K-feldspar, plagioclase, and biotite within the granite samples may have undergone intense fractional crystallization. The Wulao Shan gneissic granite is an arc granite associated with subduction, indicating that the Lincang Block underwent proto-Tethys subduction. This finding provides evidence for proto-Tethys subduction down to the Lincang-Simao block and further supports the bidirectional subduction model of the proto-Tethys.

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