新疆準(zhǔn)噶爾北緣加瑪特金銅礦區(qū)輝長巖鋯石U-Pb年齡、巖石地球化學(xué)特征及地質(zhì)意義
發(fā)布時(shí)間：2018-08-28 13:42
【摘要】：加瑪特金銅礦位于準(zhǔn)噶爾北緣,礦體賦存于輝長巖與北塔山組玄武巖接觸帶、石英閃長巖及其接觸帶,礦體呈脈狀和透鏡狀,成礦與輝長巖和石英閃長巖有關(guān)。圍巖蝕變主要有綠簾石化、黑云母化、綠泥石化、碳酸鹽化、磁鐵礦化。獲得輝長巖鋯石LA-ICP-MS U-Pb年齡為380 Ma,限定金銅礦化略晚于380 Ma。輝長巖的Th、Nb、Ta、Ti、Nd和Zr呈負(fù)異常,Rb、K、Pb和P為正異常,LREE表現(xiàn)為相對富集的右傾型分布模式和弱負(fù)銪異常到無銪異常,表明輝長巖為中泥盆世俯沖消減環(huán)境的產(chǎn)物,形成于島弧環(huán)境。原始巖漿來源于受俯沖物質(zhì)交代的地幔楔和軟流圈的混合體,巖漿經(jīng)歷了一定程度的演化,并受到弱的地殼物質(zhì)混染。
[Abstract]:Gamat gold copper deposit is located in the northern margin of Junggar. The orebody is located in the contact zone between gabbro and basalt of the Beitashan formation, quartz diorite and its contact zone. The orebody is vein-like and lenticular, and the ore-forming is related to gabbro and quartz diorite. The wall rock alteration mainly includes green curtain, biotite, green mud, carbonation and magnetite. Zircon LA-ICP-MS U-Pb dating of gabbro obtained at 380 Ma, defines gold and copper mineralization slightly later than 380 Ma. The Th,Nb,Ta,Ti,Nd and Zr of the gabbro show negative anomalies (Th,Nb,Ta,Ti,Nd and Zr). The Th,Nb,Ta,Ti,Nd and Zr of the gabbro show positive anomalies, such as the positive anomaly LREE and the weakly negative europium anomaly to the non-europium anomaly, which indicates that the gabbro is the product of the subduction and subduction environment of the Middle Devonian and formed in the island arc environment. The primitive magma originated from the mixture of mantle wedge and asthenosphere metasomatized by subduction material. The magma evolved to a certain extent and was contaminated by weak crustal material.
【作者單位】： 山東省第四地質(zhì)礦產(chǎn)勘查院;中國科學(xué)院新疆生態(tài)與地理研究所;新疆維吾爾自治區(qū)地質(zhì)礦產(chǎn)研究所;中國冶金地質(zhì)總局第一地質(zhì)勘查院;河北省地礦局探礦技術(shù)研究院;中國地質(zhì)科學(xué)院礦產(chǎn)資源研究所國土資源部成礦作用與資源評價(jià)重點(diǎn)實(shí)驗(yàn)室;
【基金】：新疆維吾爾自治區(qū)天山英才培養(yǎng)工程項(xiàng)目 新疆維吾爾自治區(qū)2014年國家高層次人才特殊支持計(jì)劃項(xiàng)目 國土資源公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)項(xiàng)目(201211073)
【分類號】：P597.3;P618.41;P618.51
[Abstract]:Gamat gold copper deposit is located in the northern margin of Junggar. The orebody is located in the contact zone between gabbro and basalt of the Beitashan formation, quartz diorite and its contact zone. The orebody is vein-like and lenticular, and the ore-forming is related to gabbro and quartz diorite. The wall rock alteration mainly includes green curtain, biotite, green mud, carbonation and magnetite. Zircon LA-ICP-MS U-Pb dating of gabbro obtained at 380 Ma, defines gold and copper mineralization slightly later than 380 Ma. The Th,Nb,Ta,Ti,Nd and Zr of the gabbro show negative anomalies (Th,Nb,Ta,Ti,Nd and Zr). The Th,Nb,Ta,Ti,Nd and Zr of the gabbro show positive anomalies, such as the positive anomaly LREE and the weakly negative europium anomaly to the non-europium anomaly, which indicates that the gabbro is the product of the subduction and subduction environment of the Middle Devonian and formed in the island arc environment. The primitive magma originated from the mixture of mantle wedge and asthenosphere metasomatized by subduction material. The magma evolved to a certain extent and was contaminated by weak crustal material.
【作者單位】： 山東省第四地質(zhì)礦產(chǎn)勘查院;中國科學(xué)院新疆生態(tài)與地理研究所;新疆維吾爾自治區(qū)地質(zhì)礦產(chǎn)研究所;中國冶金地質(zhì)總局第一地質(zhì)勘查院;河北省地礦局探礦技術(shù)研究院;中國地質(zhì)科學(xué)院礦產(chǎn)資源研究所國土資源部成礦作用與資源評價(jià)重點(diǎn)實(shí)驗(yàn)室;
【基金】：新疆維吾爾自治區(qū)天山英才培養(yǎng)工程項(xiàng)目 新疆維吾爾自治區(qū)2014年國家高層次人才特殊支持計(jì)劃項(xiàng)目 國土資源公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)項(xiàng)目(201211073)
【分類號】：P597.3;P618.41;P618.51
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