發(fā)布時間：2018-04-26 06:20

  本文選題：鋯石U-Pb定年 + 地球化學�。� 參考：《地質(zhì)科技情報》2016年05期

【摘要】：東昆侖哈日扎鉛鋅多金屬礦區(qū)地處東昆侖造山帶東段,屬青海都蘭縣境內(nèi),是近年來新發(fā)現(xiàn)的一處具有良好前景的鉛鋅多金屬礦勘查區(qū)。礦體賦存于英云閃長巖中,與其具有密切的成礦關(guān)系。利用LA-ICP-MS鋯石U-Pb測年技術(shù),獲得英云閃長巖加權(quán)平均年齡為(422.3±1.9)Ma(n=26,MSWD=0.42),確定其形成時代為晚志留世,屬加里東晚期。這也是該區(qū)首次發(fā)現(xiàn)與成礦密切相關(guān)的加里東晚期巖體。巖石地球化學研究表明,該英云閃長巖為強過鋁質(zhì)高鉀鈣堿性系列巖石;明顯表現(xiàn)為富集Rb、K等大離子親石元素、LREE和活潑的不相容元素(U、Th),相對虧損Nb、Ta、P、Ti等高場強元素和Sr元素,顯示了輕稀土元素強烈富集的右傾式稀土元素配分型式,具較明顯的負Eu異常。巖石物質(zhì)來源具有殼�；烊鄣奶攸c。綜合東昆侖區(qū)域地質(zhì)構(gòu)造演化特征,認為哈日扎英云閃長巖可能形成于后碰撞構(gòu)造階段,為東昆侖造山帶早古生代構(gòu)造旋回的產(chǎn)物。
[Abstract]:The Hareza Pb-Zn polymetallic ore area in East Kunlun is located in the eastern part of the East Kunlun orogenic belt and belongs to Dulan County in Qinghai Province. It is a promising prospecting area for the Pb-Zn polymetallic deposits discovered in recent years. The orebody occurs in Yingyun diorite and has a close metallogenic relationship. Using LA-ICP-MS zircon U-Pb dating technique, the weighted mean age of quartz diorite is 422.3 鹵1.9m ~ (26) MSWD ~ (0.42), which is determined to be late Silurian, belonging to the late Caledonian period. This is the first time that the late Caledonian rock mass closely related to mineralization was discovered in this area. The petrogeochemical study shows that the diorite is a strong peraluminous high potassium calc-alkaline series of rocks, which is obviously characterized by enrichment of large ion lithophile elements, such as RbCon K, LREE, and active incompatible elements, such as UTH, and the relative depletion of high field strength elements and Sr elements, such as NbBU TaPnTi, etc. It is shown that the REE distribution pattern with strong enrichment of light rare earth elements (LREE) is of the right-dip REE distribution pattern with obvious negative EU anomalies. The source of rock material is characterized by mixing of crust and mantle. Based on the characteristics of the regional tectonic evolution in East Kunlun, it is considered that the Haliza diorite may have been formed in the post-collision tectonic stage and was the product of the early Paleozoic tectonic cycle in the East Kunlun orogenic belt.
【作者單位】： 中國地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心;長安大學;青海省第三地質(zhì)礦產(chǎn)勘查院;
【基金】：中國地質(zhì)調(diào)查局項目(DD20160013) 西北整裝勘查跟蹤綜合與動態(tài)評估(1212011220861) 青海省都蘭縣察汗烏蘇河地區(qū)1∶5萬地質(zhì)礦產(chǎn)綜合調(diào)查(12120115022101)
【分類號】：P597.3;P618.2

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