本文關(guān)鍵詞： 地球化學(xué) 全巖分析 埃達(dá)克巖 棗子溝金礦　出處：《礦物巖石》2017年02期 　論文類型：期刊論文

【摘要】：針對(duì)西秦嶺夏河-合作金集礦區(qū)出露的巖漿巖礦物學(xué)及地球化學(xué)研究,結(jié)果表明金集礦區(qū)巖漿巖可分為兩類:第一類以德烏魯花崗閃長(zhǎng)巖、三索瑪似斑狀黑云母花崗閃長(zhǎng)巖和馬久勒中細(xì)粒黑云母花崗閃長(zhǎng)巖為代表,屬于高鉀鈣堿性準(zhǔn)鋁質(zhì)至過(guò)鋁質(zhì)中酸性巖,均富集大離子親石元素w(Rb)平均134.4×10~(-6),w(Ba)平均775.8×10~(-6),w(Th)平均15.8×10~(-6),w(U)平均3.08×10~(-6)等和輕稀土元素,相對(duì)虧損w(Nb)平均10.95×10~(-6),w(Ta)平均0.97×10~(-6)等高場(chǎng)強(qiáng)元素,顯示"I"型花崗巖地球化學(xué)特征,A/CNK值在0.95~1.07之間,Mg#值為41.87~61.92,δEu值為0.64~0.89,巖石既具埃達(dá)克質(zhì)巖特征,又顯示火山弧花崗巖特征。第二類以唐曬日村、扎油鄉(xiāng)北的花崗斑巖為代表,屬于鈣堿性過(guò)鋁質(zhì)酸性巖,均富集大離子親石元素w(Rb)平均92.4×10~(-6),w(Ba)平均561.7×10~(-6),w(Th)平均7.8×10~(-6),w(U)平均2.36×10~(-6)等和輕稀土元素,相對(duì)虧損w(Nb)平均9.96×10~(-6),w(Ta)平均0.76×10~(-6)等高場(chǎng)強(qiáng)元素,A/CNK值在1.07~1.66之間,顯示出具"S"型花崗巖地球化學(xué)特征,具有喜馬拉雅型巖漿巖特征,Mg#值為49.76~73.37,δEu為0.83~1.03,巖漿存在幔源物質(zhì)的參與。研究表明,第一類巖漿巖形成于板塊消減的陸緣環(huán)境,由玄武質(zhì)巖漿部分熔融形成,并有部分幔源物質(zhì)加入;第二類巖漿巖可能形成于沉積巖部分熔融,且有幔源物質(zhì)參與的環(huán)境。第一類巖漿巖與棗子溝金礦存在緊密的時(shí)空關(guān)系,表現(xiàn)出明顯的成礦專屬性,是指導(dǎo)夏河-合作金集礦區(qū)金礦勘探開發(fā)的重要依據(jù)之一;第二類巖漿巖與金礦無(wú)關(guān)。
[Abstract]:In view of the mineralogical and geochemical study of magmatic rocks exposed from Xiahe-Hehe-Hehe-Xiujinji deposit in the western Qinling, the results show that the magmatic rocks in the Jinji mine can be divided into two types: the first type is the Deulu granodiorite. Sansomar porphyry biotite granodiorite and medium and fine biotite granodiorite are represented by high potassium calc-alkaline pseudo-aluminite to peraluminous intermediate-acid rock. High field strength elements, such as Rb) and light rare earth element (WNB) and light rare earth elements (WNB), and the relative depletion of WNb (10.95 脳 10 ~ (10)) ~ (6) and (0.97 脳 10 ~ (10)) ~ (-6)), have an average value of 775.8 脳 10 ~ (8) ~ (-6) ~ (~ (-1)) ~ (15.8 脳 10 ~ (10) ~ (-6)) and 3.08 脳 10 ~ (10) ~ (-6), respectively, and the relative depletion of such elements is 10.95 脳 10 ~ (10) ~ (~ (10)) ~ (~ (6)). The results show that the geochemical characteristics of "I" type granites are as follows: a / C _ (K) values range from 0.95g ~ (1.07) to 41.87 ~ 61.92, 未 EU = 0.64 ~ 0.89. The rocks have the characteristics of adakitic rocks and volcanic arc granites. The second type is represented by the granitic porphyry in Tangsunicun and the northern part of Zhayou Township. Belong to calc-alkaline peraluminous acid rocks, the average value of high field and strong elements (such as (92.4 脳 10 ~ (10) ~ (-6) ~ (-6)) ~ (92.4) 脳 10 ~ (10) ~ (-6) ~ (-6)) ~ (7. 8 脳 10 ~ (10)) ~ (6) ~ (~ (6)) = 2.36 脳 10 ~ (-6)) and light rare earth elements (= 9.96 脳 10 ~ (10) ~ (-6) ~ 0.76 脳 10 ~ (-1) ~ (-6)), etc., and light rare earth elements, the relative depletion of which is 9.96 脳 10 ~ (10) ~ (-6) ~ (-6) ~ (-1)), and the average value of ACNK is between 1.07 and 1.66, and the average value of ACNK is 0.76 脳 10 ~ (-6). It shows that the geochemical characteristics of "S" type granites, with the characteristics of Himalayan magmatic rocks, such as Mg# value 49.7673.37, 未 EU = 0.83U 1.03and magma with the participation of mantle-derived materials, show that the first type magmatic rocks were formed in the continental margin environment of plate subduction, and the results show that the magmatic rocks of the first type are formed in the continental margin environment of plate subduction. The magma was formed by partial melting of Black Tortoise magma, and some mantle source materials were added. The second type magmatic rocks may be formed in environments where sedimentary rocks are partially melted and have the participation of mantle-derived materials. The first type magmatic rocks have a close temporal and spatial relationship with the Zaozigou gold deposit. It shows obvious metallogenic specificity and is one of the important bases to guide the exploration and development of gold deposits in Xiahe-Cojinji mining area, while the second type magmatic rock has nothing to do with gold deposits.
【作者單位】： 東華理工大學(xué)地球科學(xué)學(xué)院;中國(guó)地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所;甘肅省地礦局第三地質(zhì)礦產(chǎn)勘查院;中國(guó)地質(zhì)大學(xué)(北京);
【基金】：國(guó)家科技支撐計(jì)劃項(xiàng)目(2015BAB05B04-01、2015BAB05B04-02) 國(guó)家自然科學(xué)基金項(xiàng)目(U1403292,41472196) 江西省研究生創(chuàng)新專項(xiàng)資金項(xiàng)目(YC2016-S280)
【分類號(hào)】：P588.1;P618.51

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