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西准噶尔晚古生代花岗岩地球化学特征及构造意义的初步研究
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摘要
研究区地处新疆塔城地区托里县,位于准噶尔盆地西北缘。本文在野外实地调查研究的基础之上,通过分析研究区花岗岩体的岩石组合类型和岩石地球化学特征,探讨了西准噶尔晚古生代花岗岩类形成时的构造环境、成因机制及构造意义。
     研究区内广泛发育晚古生代后碰撞花岗岩,侵入岩年龄分别为:309.4±2.5Ma(色尔登岩体)和319.6±3.2Ma(哈图岩体),在时代上属于晚石炭世。区内岩浆岩由A2型花岗岩和I型花岗岩组成。其中哈图花岗岩体具有高硅、低铝、富碱、准铝质-弱过铝质、贫钙、低镁,10000×Ga/Al比值较大,强烈富集高场强元素(HFSE), Sr、Ba强烈亏损,稀土配分模式图呈现典型的右倾“海鸥型”等,这些特征表明哈图花岗岩应为典型的铝质A型花岗岩。A1-A2型花岗岩判别图解显示哈图花岗岩体为A2型花岗岩。而色尔登岩体的矿物岩石学特征、岩石地球化学判别数据及图解表明色尔登岩体应为I型花岗岩。区内晚石炭世后碰撞I型及A2型花岗岩为西准噶尔地区晚石炭世地壳内部物质重新分配的过程提供了新的证据。
     色尔登、哈图花岗岩应形成于后碰撞时期伸展背景之下,前者源于基性物质的部分熔融,后者可能源于长英质物质,但形成时的地壳厚度薄;部分熔融的热力来源为软流圈玄武质岩浆底侵作用促使下地壳物质熔融。
The studied region is located in West Junggar,Toli contry of Tacheng District,Xinjiang of China. Based on the field study, this work has carried out granitoids formed during the Late Paleozoic tectonic environment,formation mechanism and tectonic significance, by analyzing the combination of granite rock types and geochemical characteristics of the West Junggar.
     The post-collisional magrnatic rocks of late Paleozoic is widespread in the studied areas, The intmsioas formed in 319.6±3.2Ma(Hatu granite) and in 309.4±2.5Ma (Seerdeng granite), the era of the Late Carboniferous. Magmatic rocks in the region consist of A2-type granite and I-type granite. Hatu granite with high silicon, low aluminum, alkali-rich, metaluminous-weakly peraluminous, and poor calcium, low magnesium,10000×Ga/Al ratio was higher, strong enrichment in high field strength elements (HFSE), Sr, Ba strong losses, REE patterns show a typical right-wing plan "seagull-type", etc.These features envinced that granite in Hatu should be typically aluminous A-type granite. Al-A2-type granite discrimination diagrams show that granite in Hatu is the A2-type granite. But about the Serdeng rock, characteristics of mineral rocks, geochemical discrimination diagrams show that the Serdeng rock should be I-type granite rock. In the region that post-colisional I type and A2 type granites after Late Carboniferous provides new evidence for Late Carboniferous crustal material and re-allocation process in the West Junggar region
     Seerdeng and Hatu granites formed in a post-collisional extension context. The fomer results from the partial melting of basical substance,the later probably results from femic mineral, with a circumstance of thin continental crust; the underplating of asthenosphere basaltic magma provides the heat enegy for partial melting of the lower crust.
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