The genesis and dating of the Early Permian granitic rock in the north of Xilin Hot, Inner Mongolia
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摘要:
内蒙古锡林浩特北部朝克乌拉山附近分布有早二叠世花岗岩类，可作为兴蒙造山带东部构造-岩浆活动的研究载体。本文通过对花岗岩类进行岩相学、岩石地球化学、锆石U-Pb年代学的研究，讨论其岩石成因、构造环境。早二叠世侵入岩岩性主要为正长花岗岩、二长花岗岩、正长斑岩。地球化学上，岩石具有高硅、富碱、贫钙、贫镁的特点，属于偏铝—过铝质碱性花岗岩。轻重稀土元素存在一定程度的分馏，总体表现出轻稀土相对富集、重稀土相对亏损，具有明显的负Eu异常，Rb、Th、K、La、Ce、Nd、Zr、Hf、Sm元素明显富集，Ba、Ta、Nb、Sr、P、Ti元素显著亏损。岩石的锆石饱和温度为802℃，具有低Sr高Yb特征，指示岩体形成于高温低压环境，结合岩石地球化学表明岩体属于铝质A型花岗岩，其源岩与岛弧岩浆作用有关。锆石U-Pb测年结果为(275.6±1.3)Ma(正长花岗岩)、(274.2±1.4)Ma(正长斑岩)，表明岩体形成时代为早二叠世晚期。结合区域上阿木山组中安山岩夹层的锆石U-Pb年龄，古生物、花岗岩证据表明晚石炭世至早二叠世晚期，贺根山洋闭合并完成了板块碰撞挤压到碰撞伸展的转换。
Abstract:The Permian granitic rock near the Chaokewula Mountain in the north of Xilin Hot area are very important for the study of the structural and magmatic acitivities in eastern Xing'an-Mongolian orogenic belt. The purpose of this study is to discuss the petrogenesis and tectonic setting based on detailed investigation of petrography,litho-geochemical characteristics and zircon U-Pb chronology of the granitic rock. The rocks are mainly composed of syenogranite,monzonitic granite and orthophyre. Geochemically,the granites are characterized by rich silicon and alkalis as well as depletion of calcium and magnesium,thus belonging to aluminous-peraluminous alkali granite. The rare earth elements demonstrate a slightly high degree of fractionation,and are characterized by richness of LREE and poorness of HREE. The rocks exhibit significant negative Eu anomalies. Trace element analyses show that the rocks are enriched in Rb,Th,K,La,Ce,Nd,Zr,Hf and Sm and depleted in Ba,Ta,Nb,Sr,P and Ti. The zircon saturation temperature of rock is 802℃,with geochemical characteristics of low Sr and high Yb,showing that the rocks were formed in an environment of high temperature and low pressure. Combined with the geological and geochemical data,the authors hold that the rocks belong to aluminous A-type granite,and the sources of rocks were formed in an island-arc environment. The zircon U-Pb age of syenogranite is (275.6±1.3) Ma,and the zircon U-Pb age of orthophyre is (274.2±1.4) Ma,respectively. These results indicate that the rock body was formed in late period of early Permian. With a set of volcanic rocks of Amushan Formation as the research object,the authors obtained the zircon U-Pb age of andesite. Combined with the palaeontology,granitoids and chronological evidence,the authors consider that the Hegenshan Ocean was closed and completed the transformation from collision to post-collision during the period from late Carboniferous to late Early Permian.
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Key words:
- geological significance /
- A-type granite /
- zircon U-Pb age /
- geochemistry /
- Hegenshan orogenic belt
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图 2 侵入岩TAS分类图解(a—底图据Middlemost, 1994)和K2O−SiO2图解(b—底图据Peccerllo et al., 1976)
Figure 2.
图 3 侵入岩A/NK-A/CNK图解(底图据Maniar et al., 1989)
Figure 3.
图 4 稀土元素原始地幔标准化分布型式图(a)和微量元素原始地幔标准化蛛网图(b)(原始地幔标准化值据Sun et al., 1989)
Figure 4.
图 7 (Na2O+K2O)/CaO−(Zr+Nb+Ce+Y)成因判别图解(底图据Whalen et al., 1987)
Figure 7.
表 2 侵入岩稀土和微量元素分析结果(10−6)
Table 2. REE and trace elements compositions of intrusive rocks(10−6)
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表 3 侵入岩LA−ICP−MS锆石U−Pb年代学分析结果
Table 3. LA−ICP−MS zircon U−Pb dating results of intrusive rock
下载: 导出CSV
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