投稿时间：2014-09-06
修订日期：2014-10-23
网络发布日期：2015-07-02
中文摘要:粤西阳春盆地为广东省重要的多金属矿集区之一,主要包括矽卡岩型、斑岩-矽卡岩型和热液脉型3类多金属矿床。阳春盆地发育多种矿化元素,矿种以Cu、Fe、Pb、Zn、Ag、W、Sn为主,Au、Mo、Bi次之。文章在梳理前人工作成果的基础上,将阳春盆地的多金属矿床厘定为一个成矿系列和3个成矿亚系列:即与燕山期侵入岩有关的Fe-Cu-Pb-Zn-W-Sn多金属矿床成矿系列,包括与中侏罗世侵入岩有关的铁铜多金属矿床成矿亚系列(Ⅰ)、与早白垩世中酸性侵入岩有关的铜钼铅锌多金属矿床成矿亚系列(Ⅱ)和与晚白垩世花岗岩有关的W-Sn多金属矿床成矿亚系列(Ⅲ)。Ⅰ和Ⅱ成矿亚系列主要沿阳春盆地的边缘坳陷带分布,受NE-NNE向构造及EW向构造复合控制,成矿岩体主要为花岗闪长岩、二长花岗斑岩以及二长花岗岩等,来源于相对深部,为壳幔同熔的产物,成因类型主要包括矽卡岩型和斑岩-矽卡岩型;Ⅲ成矿亚系列主要产于隆起区与坳陷带接壤部位及坳陷带中局部隆起地段,受隐伏的NW向构造控制,与成矿有关的花岗岩类属弱过铝质-准铝质花岗岩,由地壳物质重熔而形成,也可能有少量的地幔物质加入,矿床类型以石英脉型和斑岩-矽卡岩型-热液脉型为主。大量的高精度测年数据表明:Ⅰ亚系列成矿时代主要集中在170~160 Ma,Ⅱ亚系列成矿年龄主要集中在110~98 Ma,而Ⅲ亚系列成矿年龄为85~76 Ma,前一成矿亚系列对应的成矿动力学背景为太平洋板块的俯冲环境,而Ⅱ和Ⅲ成矿亚系列则处于燕山晚期的拉张伸展环境并伴随强烈的壳幔相互作用,其可能与135 Ma之后太平洋板块的运动方向发生转向有关。
Abstract:The Yangchun Basin, one of the important polymetallic ore concentration areas in Guangdong Province, mainly possesses skarn, porphyry-skarn and vein type deposits. Yangchun Basin has developed multiple ore-forming elements, mainly Cu, Fe, Pb, Zn, Ag, W, Sn and subordinately Au, Mo, Bi. Based on previous researches, the authors hold that these deposits belong to one metallogenic series, i.e., Fe-Cu-Pb-Zn-W-Sn polymetallic ore-deposit minerogenetic series related to Yanshanian intrusion, which can be subdivided into three subseries of ore deposits. The major subseries are composed of Fe-Cu polymetallic deposit subseries (Ⅰ) associated with Middle Juarassic intrusive rocks, Cu-Mo-Pb-Zn polymetallic deposit subseries (Ⅱ) related to Early Cretaceous intermediate-acid intrusive rocks and W-Sn polymetallic deposit subseries (Ⅲ) associated with Late Cretaceous granite. Ⅰand Ⅱsubseries are distributed along the marginal depression of Yangchun Basin and controlled by the composite part of NE-NNE trending structures and EW structures. Metallogenic rock bodies are mainly granodiorite, monzogranite-porphyry and monzonite granite, which were derived from the relatively deep part and formed by the melting of the crust and the mantle, and the genetic types of ore deposits are mainly of porphyry and porphyry-skarn types;deposits of Ⅲ subseries are controlled by buried NW-trending structures, and occur in the contact part of uplifting area and hollow zone as well as parts of uplifting areas of the hollow zone. Granitoids associated with mineralization are mainly weak-intermediate peraluminous granites, which were formed by the melting of crustal substances, with the probable addition of a small amount of mantle substances. The deposit genetic types are mostly of vein type and porphyry-skarn-vein type. A large number of high-precision dating data show that deposits ofⅠsubseries have ages of 170~160 Ma, and those of Ⅱ and Ⅲ subseries have ages of 110~98 Ma and 85~76 Ma, respectively. In conclusion, the metallogenic geodynamical settings of Ⅰsubseries corresponded to the Pacific plate subduction environment, and the metallogenic geodynamical settings of Ⅱ and Ⅲ subseries might have been related to late Yanshanian pull-apart and stretching environment accompanied by strong crust-mantle interaction, which was probably caused by the change of the movement direction of the Pacific Plate after 135 Ma.
keywords:geochenmistry deposit type minerogenetic series of ore deposits metallogenic epoch metallogenic geodynamic settings Yangchun Basin in western Guangdong
文章编号：
中图分类号：P618.41;P618.44;P618.67
文献标志码：
基金项目:本文得到国家自然科学基金项目(编号:41203036)、国土资源部成矿作用与资源评价重点实验室开放基金项目(编号:ZS1306)和北京市优秀博士科研经费项目(编号:519002650744)联合资助
引用文本：
郑伟,毛景文,赵海杰,赵财胜,林玮鹏,欧阳志侠,吴晓东,田云.2015.粤西阳春盆地多金属矿床成矿系列及动力学背景[J].矿床地质,34(3):465~487ZHENG Wei,MAO JingWen,ZHAO HaiJie,ZHAO CaiSheng,LIN WeiPeng,OUYANG ZhiXia,WU XiaoDong,TIAN Yun.2015.A preliminary study of minerogenetic series and geodynamic background of polymetallic deposits in Yangchun Basin of western Guangdong Province[J].Mineral Deposits34(3):465~487
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