本文選題：鋯石U-Pb年代學(xué)　切入點(diǎn)：甘孜-理塘縫合帶　出處：《地質(zhì)科技情報(bào)》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(nèi)與甘孜-理塘縫合帶演化有關(guān)的鎂鐵質(zhì)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(nèi)相關(guān)中酸性火山巖—巴塘群英安巖為研究對象,對其進(jìn)行了LA-ICP-MS鋯石U-Pb同位素測試,以探討其構(gòu)造背景及成巖年代學(xué)意義。測試結(jié)果表明,巴塘群英安巖的鋯石U-Pb年齡為(220±1)Ma,噴出時(shí)限為晚三疊世。結(jié)合區(qū)內(nèi)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(gòu)造背景,甘孜-理塘古特提斯洋在晚三疊世時(shí)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(guān)的鎂鐵質(zhì)巖、中酸性侵入巖、中酸性火山巖的時(shí)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(zhì)礦產(chǎn)勘查局地質(zhì)礦產(chǎn)勘查院;中國地質(zhì)大學(xué)(武漢)資源學(xué)院;長江大學(xué)地球科學(xué)學(xué)院;
【基金】：中國地質(zhì)調(diào)查局項(xiàng)目“青海省多彩地區(qū)銅多金屬礦整裝勘查區(qū)關(guān)鍵基礎(chǔ)地質(zhì)研究”(科[2014]04-025-081)
【分類號】：P597.3;P588.1

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