| 中昆仑花岗岩类岩石地球化学特征的初步研究 |
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| 引用本文： | 王岳军,沈远超,林舸,谢宏远.中昆仑花岗岩类岩石地球化学特征的初步研究[J].大地构造与成矿学,1999,23(3):210-221. |
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| 作者姓名： | 王岳军 沈远超 林舸 谢宏远 |
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| 作者单位： | 1. 中国科学院长沙大地构造研究所,湖南,长沙,410013
2. 中国科学院地质研究所,中国,北京,100029 |
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| 摘 要： | 对研究较为薄弱的中昆仑地区不同期次花岗岩的区域分布规律、岩石化学特征及其构造环境意义进行了初步研究。研究表明加里东晚期（４３０ ～３７０ Ｍａ） 花岗岩主要分布于祁漫塔格山北坡，具科迪勒拉Ｉ 型花岗岩或ＡＣＧ、ＰＡＧ 特征，代表活动大陆边缘或弧后盆地构造属性，加里东晚期祁漫塔格北坡至少存在洋壳的有限俯冲；华力西中期（３２０ Ｍａ ±） 发育伸展型富钾低铝钙碱性花岗岩，类似加里东Ｉ 型、ＣＰＧ、ＫＣＧ 花岗岩特征，广布于祁漫塔格山和求勉雷克山区，形成于碰撞后构造环境；华力西晚期（２７０ ～２５０ Ｍａ） 具科迪勒拉Ｉ型或ＡＣＧ 特征，属活动大陆边缘构造环境，其形成与早二叠世特提斯洋的向北俯冲作用有关；印支—燕山期（２２０ ～１６０ Ｍａ） 具Ａ２ 型或富钾低钙钙碱性花岗岩，形成于碰撞后挤压向拉张转折过渡的构造环境。
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| 关 键 词： | 花岗岩 岩石化学 构造环境 中昆仑 |
| 文章编号： | 1001－1552(1999)03－0210－12 |
PRELIMINARY GEOCHEMICAL RESEARCH OF GRANITOIDS IN THE CENTRAL KUNLUN |
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| WANG Yue-jun,SHEN Yuan-chao,LIN Ge,XIE Hong-yuan.PRELIMINARY GEOCHEMICAL RESEARCH OF GRANITOIDS IN THE CENTRAL KUNLUN[J].Geotectonica et Metallogenia,1999,23(3):210-221. |
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| Authors: | WANG Yue-jun SHEN Yuan-chao LIN Ge XIE Hong-yuan |
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| Abstract: | The distribution,lithochemistry and tectonic significance of the granitoids in the Central Kunlun are preliminary discussed.The Caledonian granitoids,majorly distributed in the northern Qimatage mountain,showing geochemical characteristics of Cordilleran I-type grantiods,low-K high-Ca amphibole-bearing calc-alkaline granitoids(ACG) or peralkaline and alkaline granitoids(PAG),and associated with an active continental margin or back-arc basin,indicated the existence of the Qimatage ocean-related limited subduction during the Caledonian period.The mid-Variscan granitoids,emplaced in the Qimatage and Qiumilaike Mountains,are similar to Caledonian I-type,Cordierite-bearing peraluminous granitoids(CPG) or K-rich calc-alkaline granitoids(KCG),associated with a post-collision geodynamic environment.The late Variscan granitoids exhibit characteristics of Cordilleran I-type granitoids or ACG,associated with an active continental margin related to the northward subduction of Tethys ocean in the early Permian.The Indosinian-Yanshanian granitoids display characteristics of A2-type or high-K low-Ca calc-alkaline granitoids,related to a post-collision geodynamic environment with transition from a compressional regime to a tensional regime. |
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| Keywords: | granitoids lithochemistry geodynamic environment Central Kunlun |
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