發(fā)布時間：2018-04-16 12:09

  本文選題：東昆侖 + 鋯石LA-ICP-MS�。� 參考：《地質(zhì)科技情報》2017年01期

【摘要】：東昆侖地區(qū)是經(jīng)歷了多期次構(gòu)造巖漿旋回后形成的一個復(fù)合型造山帶,并包括多條蛇綠混雜巖帶。近來,在東昆侖東段哈隴休瑪一帶進行地質(zhì)調(diào)查過程中發(fā)現(xiàn)了輝石橄欖巖,其屬于蛇綠巖的組成部分。利用LA-ICP-MS鋯石U-Pb定年法,得到輝石橄欖巖加權(quán)平均年齡為(525.9±5.9)Ma(n=24,MSWD=0.02),確定其形成時代為早寒武世。該年齡與東昆中斷裂附近的清水泉蛇綠巖的時代相近,可能都屬于原特提斯洋打開時的產(chǎn)物,認為東昆侖造山帶在早古生代早期存在一期明顯的洋殼擴張事件,這為東昆侖地區(qū)東段早古生代的區(qū)域構(gòu)造演化提供了新的年代學(xué)證據(jù)。
[Abstract]:The East Kunlun area is a complex orogenic belt formed after several periods of tectonic magma cycles and includes several ophiolite melange belts.Recently, pyroxene peridotite, which is a part of ophiolite, has been discovered in the geological survey of Halong Xiuma area of East Kunlun.Using the LA-ICP-MS zircon U-Pb dating method, the weighted mean age of pyroxene peridotite is 525.9 鹵5.9 Ma ~ (2 +) ~ (24) MSWD ~ (2 +) ~ (0.02), which is determined to be an early Cambrian epoch.This age is close to the age of Qingshuiquan ophiolite near the middle fault of Dongkun, and may be the product of the opening of the original Tethys ocean. It is believed that there was an obvious oceanic crust spreading event in the East Kunlun orogenic belt in the early Paleozoic.This provides a new chronological evidence for the early Paleozoic regional tectonic evolution in the eastern segment of East Kunlun.
【作者單位】： 中國地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心國土資源部巖漿作用成礦與找礦重點實驗室;
【基金】：中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(DD20160013;12120113029000;12120115022101)
【分類號】：P597.3;P588.125

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