本文選題：含銅鉛鋅花崗巖　切入點：含鎢花崗巖　出處：《中國科學(xué):地球科學(xué)》2017年07期 　論文類型：期刊論文

【摘要】：南嶺地區(qū)中-晚侏羅世含銅鉛鋅與含鎢花崗巖的礦物學(xué)和地球化學(xué)特征截然不同.含銅鉛鋅花崗巖主要為準鋁質(zhì)含角閃石的花崗閃長巖,具有較高的CaO/(Na_2O+K_2O)比值、LREE/HREE比值和δEu值,較低的Rb/Sr比值,Ba、Sr、P、Ti輕微虧損,分異演化程度較低.含鎢花崗巖為高分異演化的過鋁質(zhì)花崗巖,其CaO/(Na_2O+K_2O)比值、LREE/HREE比值和δEu值較低,Rb/Sr比值較高,Ba、Sr、P、Ti強烈虧損.含銅鉛鋅花崗巖主要形成于155.2~167.0Ma,峰值為160.6Ma,含鎢花崗巖主要形成于151.1~161.8Ma,峰值為155.5Ma,兩者存在約5Ma的時差.在湘南銅山嶺含銅鉛鋅和魏家含鎢花崗巖系統(tǒng)研究基礎(chǔ)上,結(jié)合南嶺地區(qū)中-晚侏羅世含銅鉛鋅與含鎢花崗巖的對比,提出了兩類含礦花崗巖的成因模式.古太平洋板塊俯沖導(dǎo)致軟流圈上涌和玄武質(zhì)巖漿底侵.底侵玄武質(zhì)巖漿加熱促使下地殼鎂鐵質(zhì)角閃巖相基底首先發(fā)生部分熔融,形成與銅鉛鋅礦化有關(guān)的花崗閃長質(zhì)巖漿.隨著玄武質(zhì)巖漿底侵,中-上地殼富白云母變質(zhì)沉積基底發(fā)生部分熔融,形成與鎢礦化有關(guān)的花崗質(zhì)巖漿.花崗巖源區(qū)成分的差異導(dǎo)致花崗巖成礦專屬性不同,源區(qū)部分熔融的時間先后導(dǎo)致了含銅鉛鋅與含鎢花崗巖之間存在5Ma左右的時差.
[Abstract]:The mineralogical and geochemical characteristics of copper-lead-zinc and tungsten-bearing granites in the Nanling area are very different. The granodiorite of the copper-lead-zinc-bearing granodiorite, which is mainly quasi-aluminous and hornblende, has a high CaO/(Na_2O K _ 2O ratio and a high LREE / hree ratio and 未 EU value. The lower Rb/Sr ratio is slightly depleted and the degree of differentiation evolution is lower. The tungsten-bearing granites are peraluminous granites with high differentiation evolution. Its CaO/(Na_2O K _ 2O ratio, LREE / HREE ratio and 未 EU value are lower and Rb / Sr ratio is higher. The copper-lead-zinc granite is mainly formed at 155.2n 167.0 Ma.The peak value is 160.6 Ma.The tungsten granite is mainly formed at 151.1161.8 Maand the peak value is 155.5Ma. there is a time difference of about 5Ma between them. On the basis of the study of copper-lead-zinc and Weijia-containing tungsten granite systems in Shanling, Combined with the comparison of the Middle-Late Jurassic copper-lead-zinc and tungsten bearing granites in Nanling area, Two genetic models of ore-bearing granites are proposed. The subduction of the paleo-Pacific plate leads to the upwelling of the asthenosphere and the subduction of the Black Tortoise magma, and the subduction of Black Tortoise magma leads to the first partial melting of the basement of the magnesite amphibolite facies in the lower crust. The granodiorite magma associated with copper, lead and zinc mineralization was formed. With the submersion of Black Tortoise magma, the metamorphic basement of mica rich in the middle and upper crust occurred partial melting. The granitic magma related to tungsten mineralization is formed. The difference in composition of the granite source leads to the difference of the metallogenic specificity of the granite, and the partial melting time of the source region leads to the time difference of about 5 Ma between Cu-Pb-Zn and W-bearing granite.
【作者單位】： 南京大學(xué)地球科學(xué)與工程學(xué)院內(nèi)生金屬礦床成礦機制研究國家重點實驗室;Institut
【基金】：國家自然科學(xué)基金項目(批準號:41273053) 國家重點基礎(chǔ)研究發(fā)展計劃項目(編號:2012CB416702) 國家留學(xué)基金中法“蔡元培”交流合作項目資助
【分類號】：P588.121;P618.2

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