东天山中酸性侵入岩浆作用及其地球动力学意义
The intermediate-acid intrusive magmatism and its geodynamic significance in Eastern Tianshan region
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摘要: 东天山地区华里西中-晚期中酸性侵入岩浆活动强烈,加里东期、华里西早期及印支期花岗岩类分布零星,初步可分为南、北两个岛弧花岗岩带。除哈尔里克有少量碱性花岗岩外,花岗岩类均属钙碱性岩石系列。从早期到晚期,中酸性侵入岩浆作用经历了板块碰撞前、火山弧、碰撞同期、板内伸展、陆内叠覆造山和非造山6个演化阶段,岩石成因类型可分为M、CM、C、A4种类型。南、北岛弧的碰撞与缝合从北东向南西呈现出递进演化的特点。土屋-赤湖、石英滩、维权、白山等铜、钼、金矿床与华里西中期岛弧环境产出的过铝质钙碱性系列CM型花岗岩类关系密切。Abstract: The intrusive magmatism of the midlater Hercynian granitoids is very strong in the Eastern Tian shan region,where the distribution of the Caledonian,the earlier Hercynian and the Indo-China granitoids arera rerelatively. The granitoids in the Eastern Tian shan region are divided in to two belts including Kangurtag-Harlik is land arc granite belt(the northern belt)and Aqishan-Yaman suisland arc belt(the southern belt). Except the Harlik Mounta in having several alka line granite plutons,the granitoids in the Eastern Tianshan region belong to the calc-alka line series. From the Caledonian period to the Indo-China period,the in trusive magma tism had undergone the six evolutional stages:preplate collision,volcanic arc,syn-collision,exten sion with in plate,orogenesis with in continent and anorogenesis. The genetic types of the Eastern Tian shan granitoids can bedivided in to M,CM,C and A types. The collision and the closing of the Southern is land a rc and the Northern island arc present prog ressive evolution from the northeast to the southwest.The copper,molybdenum and goldo redeposits such as Tuwu,Yandong,Chihu,Shiying tan,Weiquan,Baishan et al are bound up with the CM type of the a luminium supersatu rated calc-alka line granitoids.
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Keywords:
- granitoids /
- tectono-geochemical types /
- Eastern Tian shan /
- Xinjiang
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