【摘要】：本文以額爾古納地塊新元古代佳疙疸組和新元古代 早古生代侵入巖為研究對象,通過對變沉積巖和火山巖中碎屑鋯石和巖漿鋯石LA-ICP-MS和SIMS U-Pb年代學研究,確定了佳疙疸組的形成時代,并討論了佳疙疸組中新元古代地層的沉積物源及其構造屬性;通過對侵入巖中鋯石LA-ICP-MS U-Pb定年,輔以榍石LA-ICP-MS U-Pb定年,確定了額爾古納地塊新元古代 早古生代巖漿事件的年代學格架,并基于全巖主、微量元素和Sr-Nd同位素以及鋯石Hf同位素的地球化學研究,討論了研究區(qū)新元古代 早古生代不同期次侵入巖的巖石組合和巖漿源區(qū)性質及其形成的構造背景。最終結合區(qū)域地質資料及前人研究成果,探討了額爾古納地塊新元古代 早古生代區(qū)域構造演化歷史及其塊體屬性。
[Abstract]:In this paper, the Neoproterozoic Jiagi formation and Neoproterozoic early Paleozoic intrusive rocks in the Erguna block were studied. The LA-ICP-MS and SIMS U-Pb chronology of detrital zircon and magmatic zircon from metamorphic sedimentary rocks and volcanic rocks were studied. The formation age of Jiakuni formation is determined, and the sediment source and tectonic attributes of Neoproterozoic strata in Jiakuangi formation are discussed. The zircon LA-ICP-MS U-Pb dating in intrusive rocks is supplemented by sphene LA-ICP-MS U-Pb dating. The chronological framework of Neoproterozoic early Paleozoic magmatic events in the Erguna massif has been determined, and geochemistry of the main rock, trace elements and Sr-Nd isotopes, as well as zircon HF isotopes has been studied. The rock assemblages and magmatic origin of Neoproterozoic early Paleozoic intrusive rocks and their tectonic setting are discussed. Finally, based on the regional geological data and previous research results, the history and block properties of the Neoproterozoic early Paleozoic regional tectonic evolution in the Erguna massif are discussed.
【學位授予單位】：吉林大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：P597.3;P588.1
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本文編號：2181484