Characteristics of granodiorite in the Litang area of Sichuan and its volcanic arc magmatism accretionary wedge
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摘要:
研究目的 通过查明理塘地区拉扎嘎山花岗闪长岩的年龄、地球化学特征，探讨花岗闪长岩形成的时代、成因及构造背景，为研究甘孜—理塘洋盆俯冲增生构造演化过程提供依据。
研究方法 选取甘孜—理塘蛇绿混杂岩带俯冲增生楔内花岗闪长岩，系统开展岩相学、LA-ICP-MS锆石U-Pb年代学和岩石地球化学研究。
研究结果 花岗闪长岩含有大量的角闪石、黑云母等铁镁矿物，局部见大量的闪长质包体和围岩捕掳体。岩体形成于晚三叠世（（207.2±1.5)Ma），岩石属I型钙碱性准铝质花岗岩类，具富集大离子亲石元素Rb、Ba、K、Th、U，亏损高场强元素Nb、Ta、P、Zr、Ti，显示轻稀土富集、重稀土亏损的右倾式配分模式，具有Eu的负异常，是典型的火山弧型花岗岩。
结论 结合区域地质资料及本文研究成果，认为四川理塘地区拉扎嘎山花岗闪长岩与甘孜—理塘洋向西俯冲致使中咱地块东缘增生楔不断扩大密切相关，是增生楔杂岩熔融成不同类型岩浆混合的产物。
Abstract:This paper is the result of geological survey engineering.
Objective By finding out the age and geochemical characteristics of granodiorites in Lazhagashan area, this paper discusses the age, genesis and tectonic background of granodiorites, so as to provide a basis for the study of subduction-accretion processes in the Ganzi-Litang Ocean Basin.
Methods Our project carried out systematically study the petrography, LA-MC-ICP-MS zircon U-Pb chronology and rock geochemistry from the granodiorites in subduction accretion complex of Ganzi-Litang ophiolite melange belt.
Results The granodiorites contain a large amount of femic mineral such as amphibole, biotite, and a large number of dioritic enclaves and surrounding rock xenoliths. The intrusive rocks were formed in the Late Triassic ((207.2±1.5)Ma), and are I-type calc-alkaline quasi-aluminous granites with enriched in large-ion-lithophile elements (LILE), such as Rb, Ba, K, Th and U, depleted in high-field-strength elements (HFSE), such as Nb, Ta, P, Zr and Ti. It shows a right-leaning pattern of enrichment of light rare earth and depletion of heavy rare earth. It is a typical volcanic arc granite showing strong enrichment of LREE and depletion of HREE, with negative Eu anomaly.
Conclusions Combined with the regional geological data and the research results of this paper, it is considered that the Lazhagashan granodiorite in Litang area is closely related to the westward subduction of the Ganzi-Litang Ocean resulted in the expansion of the accretionary complex in the eastern margin of the Zhongza block, which is the product of melting accretionary complex into different types of magma mixing.
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图 1 理塘蛇绿混杂岩带大地构造位置图（a, 据Hou et al., 2007修改）和理塘地区区域地质简图（b）
Figure 1.
图 5 拉扎嘎山花岗闪长岩TAS图解（据Middlemost, 1994）
Figure 5.
图 6 拉扎嘎山花岗闪长岩SiO2-K2O图解（a, 据Peccerillo and Taylor, 1976）和A/CNK-A/NK图解（b, 据Maniar and Piccoli, 1989）
Figure 6.
图 8 拉扎嘎山花岗闪长岩微量元素构造环境判别图解（底图据Pearce et al., 1984）
Figure 8.
表 1 拉扎嘎山花岗闪长岩（PM011-43DN1）LA-ICP-MS锆石U-Pb同位素测试结果
Table 1. LA-ICP-MS Zircon U-Pb isotope data of granodiorites(PM011-43DN1) from the Lazhagashan area
下载: 导出CSV
表 2 拉扎嘎山花岗闪长岩常量元素（%）和微量元素（10-6）分析结果
Table 2. Major(%) and trace elements(10-6) contents of granodiorites from the Lazhagashan area
下载: 导出CSV
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