广西大厂矿田大坪多金属矿床成矿规律和成因类型

广西南丹大厂矿田大坪多金属矿床位于大厂龙箱盖—铜坑大型隐伏花岗岩体向西部和深部延伸的区域,存在较明显的矿致物化探异常;隐伏花岗岩致构造成矿的规律明显,已发现多个锌、银、铅、锑、铜、锡多金属隐伏矿体,矿体分布存在明显的垂直分带现象;赋矿层位有泥盆系上统同车江组(D_3t)、五指山组(D_3w)、榴江组(D_3l)和中统罗富组(D_2l)地层及断层破碎带;矿体受隐伏花岗岩体、地层和构造等多种因素控制;矿床成因类型有喷流沉积型、构造—热液改造型和夕卡岩型,为多因复成矿床。

Metallogenic regularity and genetic type of Daping tin polymetallic deposit in Dachang ore field, Guangxi

The Daping tin polymetallic deposit in Dachang ore field, Nandan, Guangxi, was located in the western and deep extended part of large-sized hidden Longxianggai-Tongkang granitic pluton where apparent geophysical and geochemical anomalies occur. There are clear structural ore-controlling metallogenic regularities by hidden ganite intrusion.-caused structure metallogenic regularities was evident. Several hidden Zn-Ag-Pb-Sb-Cu-Sn polymetallic ore bodies were found and there is apparent vertical zoning of mineralization distribution. The ore-hosting strata mainly are Tongchejiang formation (D₃t), Wuzhishan formation (D₃w) and Liujiangzu formation (D₃l)of Upper Devonian system and Luofu formation of Middle Devonian system (D₂l), the mineralization was jointly controlled by the hidden granite intrusion, host strata and structure.The genetic types of the deposit include exhalative sedimentary type, structural-hydrothermal transformation type and skarn type, therefore it is a complex genetic type deposit.