本文關鍵詞： 地球化學 鉬、銅礦床 控礦因素 時空分布規(guī)律 成礦潛力 陜西東部　出處：《礦床地質》2016年04期 　論文類型：期刊論文

【摘要】：陜西秦嶺東部地區(qū)中生代鉬、銅礦床成礦類型齊全,有斑巖型、斑巖-矽卡巖型、矽卡巖型、石英脈型和碳酸巖脈型。鉬礦床主要分布在小秦嶺地區(qū),有向西秦嶺過渡和向南秦嶺延伸的趨勢;銅礦床主要分布在南秦嶺地區(qū)。除碳酸巖脈型鉬礦床外,這些鉬、銅礦床多與花崗質小巖體具有密切的成因聯(lián)系,不受容礦地層的限制,成礦時代主要集中在晚三疊世—早侏羅世和晚侏羅世2個階段,與共生巖體的成巖時代多數(shù)相同,個別相差在10 Ma內。賦礦巖體多受近EW向與NE向或NW向斷裂構造交匯部位的控制,與鉬礦床有關的成礦巖體顯示高硅(w(Si O2)71%)、高鉀(K2O/Na2O1)、中鐵(w(TFe)=0.13%~2.45%)特征,而與銅礦床有關的巖體相對低硅(70%w(Si O2)62%)、中鉀(K2O/Na2O0.88)、高鐵(w(TFe)=1.9%~4.8%)。礦石、巖體和地層的S、Pb、Sr、Nd同位素組成顯示,除晚三疊世碳酸巖脈型和石英脈型鉬礦的成礦物質來源于Ⅰ型富集地幔外,早侏羅世—晚白堊世斑巖-矽卡巖型及石英脈型鉬、銅礦成礦物質以殼幔混源為主,但銅礦比鉬礦具有更多的幔源物質。地質和地球化學特征指示,南秦嶺和北秦嶺地區(qū)有形成斑巖型銅、鉬礦床的有利條件,也有不利因素,不利因素導致南秦嶺和北秦嶺地區(qū)淺部不易形成大型斑巖銅、鉬礦床,但形成小-中型銅、鉬礦床的潛力大。
[Abstract]:The metallogenic types of Mesozoic molybdenum and copper deposits in eastern Qinling, Shaanxi Province are complete, including porphyry type, porphyry skarn type, skarn type, quartz vein type and carbonatite vein type. Molybdenum deposits are mainly distributed in Xiaoqinling area. There is a trend of transition to the West Qinling Mountains and extension to the South Qinling Mountains; Copper deposits are mainly distributed in the South Qinling area. Except carbonatite vein molybdenum deposits, these molybdenum and copper deposits are closely related to granitic rock bodies and are not restricted by ore-bearing strata. The metallogenic age is mainly concentrated in the late Triassic-early Jurassic and the late Jurassic stages, which are the same as most of the diagenetic ages of the symbiotic rock mass. Some of them are within 10 Ma. The ore-bearing rock bodies are controlled by the intersection of near-EW and NE or NW-trending faults. The ore-forming rock bodies related to molybdenum deposits show the characteristics of high silicon, high K _ 2O / Na _ 2O _ 1, and 0.13 ~ (0.13) ~ 0.13 ~ 0.45). The relative low Si ~ (2 +) ~ (70) Si / O ~ (2 +) and K _ 2O / Na _ 2O _ (0.88) are related to the copper deposit. The isotopic composition of SbPb-Sr-Ndn in ore, rock mass and strata is shown in 1.9H ~ (-1) ~ (th) ~ (th) ~ (th) ~ (th) ~ (th) ~ (th) ~ ((th)). In addition to the late Triassic carbonatite vein type and quartz vein type molybdenum ore-forming material originates from type I enriched mantle, early Jurassic-late Cretaceous porphyry skarn type and quartz vein type molybdenum, the ore-forming material of copper deposit is mainly crust mantle mixed source. The geological and geochemical characteristics indicate that the South Qinling and North Qinling areas have favorable conditions for the formation of porphyry copper and molybdenum deposits, and there are also some unfavorable factors. It is difficult to form large porphyry copper and molybdenum deposits in the shallow part of the South Qinling and North Qinling regions, but there is a great potential for the formation of small to medium copper and molybdenum deposits.
【作者單位】： 西北有色地質礦業(yè)集團有限公司;長安大學;西北有色地質勘查局七一三總隊;西北有色地質勘查局七一二總隊;
【基金】：“十二五”國家科技支撐計劃課題(編號:2011BAB04B05) 西北有色地質礦業(yè)集團博士后項目 國土資源部公益性行業(yè)科研專項(編號:201111007-3)聯(lián)合資助
【分類號】：P618.41;P618.65
【正文快照】： have genetic relations with small granitic intrusions,and have no clear controlling influence from strata.The ore-forming ages of these deposits are mainly in two epochs:Late Triassic-early Jurassic and late Jurassic,close to therock-forming age of the o

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