【摘要】：黑山頭金礦點是西準噶爾薩吾爾地區(qū)最新發(fā)現(xiàn)的金礦化點,通過對該金礦點賦礦巖石的LA-ICP-MS鋯石U-Pb年齡以及地球化學特征的研究,探討其構(gòu)造背景及成因信息。黑山頭金礦點賦礦巖石主要為二長巖,礦化區(qū)內(nèi)發(fā)育鉀長石化、硅化、青磐巖化、碳酸鹽化等蝕變。二長巖LA-ICP-MS鋯石U-Pb年齡為351.1±3.2 Ma,表明其形成于早石炭世早期。主量元素特征顯示其屬于鈣堿性準鋁質(zhì)巖石,相對洋中脊玄武巖富集Sr、Ba、Th等大離子親石元素,虧損Nb、Ta、Ti等高場強元素。二長巖為典型的I型花崗巖,區(qū)域地質(zhì)及地球化學特征指示其形成于島弧環(huán)境。礦區(qū)內(nèi)二長巖具有高Sr、Na_2O和Al_2O_3,低Y和HREE等特征,與埃達克巖地球化學特征一致。樣品具有較高的ε_(Nd)(t)和較低的(~(87_Sr/~(86)Sr)t,結(jié)合它們形成于晚古生代島弧環(huán)境,暗示這些埃達克巖可能由俯沖洋殼熔融形成;而薩吾爾地區(qū)早石炭世晚期(340 Ma)中酸性侵入巖可能為玄武質(zhì)下地殼熔融的產(chǎn)物。本次新發(fā)現(xiàn)的埃達克巖為該區(qū)進一步尋找斑巖礦床提供了有用線索,并且礦床圍巖蝕變特征、礦化特征與斑巖礦床相似,暗示黑山頭礦點具有良好的成礦條件和找礦潛力。
[Abstract]:The heyshetou gold spot is the most newly discovered gold mineralization point in the Sawu area of Western Junggar. Through the study of the LA-ICP-MS zircon U-Pb age and geochemical characteristics of the ore bearing rocks in the gold deposit, the tectonic background and genetic information are discussed. The ore bearing rocks of the heyshead gold deposit are mainly two long rocks, and the potash long fossilization, silicification and green are developed in the mineralized area. The LA-ICP-MS zircon U-Pb age of the two long rock is 351.1 + 3.2 Ma, indicating that it was formed in the early Early Carboniferous. The main element characteristics showed that it belonged to the calcium alkaline paralic rock, and the middle ridge basalt was rich in Sr, Ba, Th and other large ionic stone elements, and lost the high field strong elements such as Nb, Ta, Ti and so on. Two long rock was a typical I type. Granite, regional geological and geochemical characteristics indicate that it is formed in the island arc environment. The two long rocks in the mining area have the characteristics of high Sr, Na_2O and Al_2O_3, low Y and HREE, which are consistent with the geochemical characteristics of the epic rocks. The samples have high epsilon (Nd) (t) and lower (~ (87_Sr/~ (86) Sr) t, which are formed in the late Paleozoic island arc environment, implying that Some of the etydic rocks may be fused by subducted oceanic crust; and the acid intrusive rocks in the late Early Carboniferous (340 Ma) in the soual region may be the product of the melting of the basaltic lower crust. The newly discovered etacites provide useful clues for further finding the porphyry deposits in the area, and the alteration of the surrounding rocks of the deposit, mineralization characteristics and porphyry deposits. Similar beds suggest that the hehshan ore deposit has good metallogenic conditions and prospecting potential.
【作者單位】： 新疆有色地質(zhì)勘查局706隊;
【基金】：“十二五”國家科技支撐計劃項目(2011BAB06B01)資助
【分類號】：P597.3;P618.51

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