本文選題：瓊南縫合帶 + 瓊南海盆　； 參考：《海洋地質與第四紀地質》2016年04期

【摘要】：為了獲得南海北緣瓊南縫合帶南北兩側地塊的碰撞時間,對九所陵水東段采集的中高級變質石榴石石英片巖和花崗質片麻巖進行了LA-ICP-MS鋯石U-Pb定年。實驗結果發(fā)現(xiàn):原巖為沉積巖的石榴石石英片巖形成于晚泥盆紀;3個鋯石變質殼諧和/近諧和年齡表明碰撞事件發(fā)生在(233±4)Ma左右;花崗質片麻巖原巖為同構造侵位的花崗巖,其8個鋯石增生年齡顯示的是深熔作用的時間,為(206±3)Ma。這些研究成果對重建南海北緣瓊南縫合帶在研究區(qū)內的演變歷史具有重要意義。
[Abstract]:In order to obtain the collision time of the northern and southern Qiongnan suture belt of the South China Sea, LA-ICP-MS zircon U-Pb dating was carried out for the middle and high grade metamorphic garnet quartz schist and granitic gneiss collected in the eastern segment of Jiushengshui.The experimental results show that garnet quartz schist with sedimentary rocks was formed in the late Devonian, three zircon metamorphic crust harmonic / near harmonic ages indicated that the collision event occurred around #number0# 鹵4)Ma, and the granitic gneiss was a syntectonic emplacement granite.The age of 8 zircon accretion shows the time of deep melting, which is 206 鹵3 Ma.These results are of great significance for reconstructing the evolutionary history of the Qiongnan suture zone in the northern margin of the South China Sea.
【作者單位】： 中國科學院南海海洋研究所邊緣海與大洋地質重點實驗室;中國科學院大學;
【基金】：國家自然科學基金項目(41276048;91328205;41476039;41206035) “中國海及鄰域地質地球物理及地球化學系列圖”項目(GZH200900504-WX02)
【分類號】：P597.3;P736.1

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