本文選題：石英閃長巖 + 巖漿混合��； 參考：《巖石學報》2016年09期

【摘要】：近年來古太平洋構造域的構造演化備受學者關注。本文報道的延邊開山屯地區(qū)花崗閃長巖-石英閃長巖體LAICP-MS U-Pb年齡表明其形成時間為早侏羅世早期(198±1Ma),所采樣品可根據(jù)Zr/Hf值分為高Zr/Hf值組花崗閃長巖和低Zr/Hf值組石英閃長巖。高Zr/Hf值組花崗閃長巖起源深度淺,富集Rb、Th、U、K等大離子親石元素(LILEs),貧Nb、Ta、Ti等高場強元素(HFSEs),具殼源巖漿的特點。低Zr/Hf值組為殼源巖漿與來自深部的虧損地幔巖漿混合而成,巖石虧損Nb、Ta、Zr、Hf、Ti等高場強元素,具有典型的弧型巖漿地球化學特征。巖體中存在細粒閃長質(zhì)包體,鏡下可見針柱狀磷灰石。開山屯巖體屬鈣堿性系列巖石,結合前人資料,認為其與該地區(qū)同時代火成巖組成北-東向分布的早侏羅世活動大陸邊緣型火成巖帶,而位于該帶西側的小興安嶺-張廣才嶺地區(qū)存在同時代弧后拉張帶,兩者構成典型的大陸弧與弧后拉張帶模型,共同揭示了早侏羅世早期古太平洋板塊對東北地區(qū)的俯沖作用。
[Abstract]:In recent years, the tectonic evolution of the paleo-Pacific tectonic domain has attracted much attention. The LAICP-MS U-Pb age of granodiorite-quartz diorite in Kaishantun area, Yanbian, reported in this paper indicates that the age of its formation is 198 鹵1MaA in the early Jurassic. The samples can be divided into granodiorite with high Zr/Hf value and quartz diorite with low Zr/Hf value according to Zr/Hf value. The granodiorite of high Zr/Hf value group is of shallow origin and is rich in large ion lithophile elements such as RbZr/Hf, Th, UK and Lil Esn, and is poor in high field strength elements such as NbSe Ta-Ti, which is characterized by crust-derived magma. The low Zr/Hf value group is composed of crust-derived magma and depleted mantle magma from deep depth. The rocks are depleted of high field strength elements such as NbTa-Tazo-Zr-Hf-Ti, and have typical geochemical characteristics of arc magma. There are fine grained diorite inclusions in the rock mass and needle-columnar apatite can be seen under the microscope. The Keshantun rock body is a calc-alkaline series of rocks. In combination with previous data, it is considered that its contemporaneous igneous rocks formed the early Jurassic active continental margin type igneous belt with the distribution of the north-east direction of the igneous rocks. In the west of the belt, there is a contemporaneous back-arc extensional belt in the Xiaoxing 'anling-Zhangguangcailing area, which constitutes a typical continental arc and back-arc extensional belt model, which reveals the subduction of the Paleo-Pacific plate in the early Jurassic to the Northeast.
【作者單位】： 吉林大學地球科學學院;大慶油田有限責任公司勘探開發(fā)研究院;
【基金】：中國地質(zhì)調(diào)查局工作項目(1212011085484) 國家自然科學基金項目(41072150)聯(lián)合資助
【分類號】：P588.122;P597.3

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