豫西地区变质核杂岩的基本特征及其对金矿床的控制  

Metamorphic core complex and its controlling role of gold deposits in Western Henan

作　　者：孙卫志[1,2] 李磊[1,2] 谢劲松[1,2] 刘德民[3] 张灯堂[1,2] 杨小芬[1,2] 

机构地区：[1]河南省地质矿产勘查开发局第一地质矿产调查院 [2]河南省金银多金属成矿系列与深部预测重点实验室 [3]中国地质大学(武汉)地球科学学院

出　　处：《黄金》2013年第8期10-16,共7页Gold

基　　金：河南省国土资源厅2009年度地质矿产科技攻关项目(2010-61-6)

摘　　要：豫西地区近EW向展布一条变质核杂岩带,自西向东由小秦岭变质核杂岩、崤山变质核杂岩和熊耳山变质核杂岩等多个变质核杂岩组成。豫西地区的小秦岭金矿田、崤山金矿田和熊耳山金矿田,在空间上分别对应于小秦岭变质核杂岩、崤山变质核杂岩和熊耳山变质核杂岩,金矿床产于变质核杂岩不同层次的拆离断层内。研究区金矿床的成矿年龄集中分布于133～122 Ma和115.3～114.34 Ma 2个时期,且以前一个成矿时期为主,与变质核杂岩SEE—NWW向区域性伸展阶段(135～123 Ma)和后期垮塌伸展阶段(116 Ma)能够很好的吻合,说明豫西地区变质核杂岩平行于造山带的SEE—NWW向区域性伸展阶段是金矿床的主要成矿阶段,垂直于造山带的后期垮塌阶段是金矿床的另一个成矿阶段。通过对研究区典型矿床的成矿特征,结合对变质核杂岩的形成演化、控矿机理的研究,揭示出变质核杂岩对研究区金矿床的类型、规模、时间、空间等方面的控制作用,指导该地区的金矿找矿工作。There exists one EW extending metamorphie eore complex belt in Western Henan, whieh is formed from west to east by Xiaoqinling metamorphie core complex. Xiaoshan metamorphic core complex and Xiong＇ershan metamorphic core complex. Xiao Qinling gold field, Xiaoshan gold field and Xiong＇ershan gold field in Western Henan Province are corresponding to Xiao Qinling metamorphic core complex. Xiaoshan metamorphic core eomplex and Xiong＇ershan metamorphie core complex in space. The gold deposits are hosted in the different levels of the metamor- phic core complexes＇ detachment faults. After eollecting and documenting the precise radiometric age date, the metallo- genisis of gold deposits focuses on two periods 133 - 122 Ma（ the main period） and 115.3 - 114.34 Ma, which are consistent with the metamorphie core complex territorially SEE-NWW extending phase（ 135 - 123 Ma）and the late breakdown phase （116 Ma）. This illustrates that the territorially SEE-NWW extending phase parallel to the orogenic belt is the main phase for mineralization and the breakdown phase vertical to the orogenic belt is another important section for the mineralization. Through systematic study on the typical deposits＇ metallogenic characteristics and the for- mation, evolution and ore-controlling mechanism of metamorphic core complexes, it can be discovered obviously that the metamorphic core complex belt plays an important role in controlling the gold deposits＇ types, scale, spatial distri- bution and temporal distribution in Western Henan Province, so we can use it in looking for more gold deposits in this area.

关 键 词：变质核杂岩 金矿床 控矿作用 豫西地区 华北陆块南缘 

分 类 号：P618.51[天文地球—矿床学] TD11[天文地球—地质学]