本文選題：鋯石U-Pb年代學　切入點：甘孜-理塘縫合帶　出處：《地質科技情報》2017年01期 　論文類型：期刊論文

【摘要】：多彩地區(qū)位于甘孜-理塘縫合帶的北西緣,區(qū)內與甘孜-理塘縫合帶演化有關的鎂鐵質巖、中酸性火山巖、中酸性侵入巖等巖漿巖出露較好。選取區(qū)內相關中酸性火山巖—巴塘群英安巖為研究對象,對其進行了LA-ICP-MS鋯石U-Pb同位素測試,以探討其構造背景及成巖年代學意義。測試結果表明,巴塘群英安巖的鋯石U-Pb年齡為(220±1)Ma,噴出時限為晚三疊世。結合區(qū)內已有研究成果分析,得出:1巴塘群火山巖的形成表明多彩地區(qū)處于甘孜-理塘古特提斯洋向羌塘地塊南西向俯沖的陸緣弧構造背景,甘孜-理塘古特提斯洋在晚三疊世時期可能仍處于俯沖消減階段;2多彩地區(qū)與甘孜-理塘縫合帶演化有關的鎂鐵質巖、中酸性侵入巖、中酸性火山巖的時代表現(xiàn)為逐漸變新的趨勢。
[Abstract]:The multicolored area is located in the western margin of the Ganzi-Litang suture zone. The magnesite and intermediate-acid volcanic rocks related to the evolution of the Ganzi-Litang suture zone are located in the area. The intermediate-acid intrusive rocks and other magmatic rocks are well exposed. The LA-ICP-MS zircon U-Pb isotopic tests were carried out on the related-intermediate-acid volcanic-Batang group dolomite. In order to discuss its tectonic setting and diagenetic chronological significance, the test results show that the zircon U-Pb age is 220 鹵1 Ma and the ejection time is late Triassic. It is concluded that the formation of volcanic rocks in the Batang group indicates that the multicolor area is located in the tectonic setting of the continental margin arc in the south-west subduction of the Ganzi-Litang paleoTethys ocean toward the Qiangtang block. During the late Triassic period, the Ganzi-Litang paleoTethys ocean may still be in the subduction and subduction stage. The mafic rocks and intermediate-acid intrusive rocks related to the evolution of the Ganzi-Litang suture zone may still be in the subduction and subduction stage. The epoch of intermediate-acid volcanic rocks shows a trend of gradual change.
【作者單位】： 青海有色地質礦產勘查局地質礦產勘查院;中國地質大學(武漢)資源學院;長江大學地球科學學院;
【基金】：中國地質調查局項目“青海省多彩地區(qū)銅多金屬礦整裝勘查區(qū)關鍵基礎地質研究”(科[2014]04-025-081)
【分類號】：P597.3;P588.1

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本文編號：1590870