摘要
地幔热柱具有多级演化特征。河淮亚热柱顶部地幔物质以薄板状斜插至燕山造山带之下，燕山造山带轴部东西向尚义－赤城韧性剪切带与太行山构造岩浆带轴部北北东向乌龙沟－上黄旗韧性剪切带交汇叠加，使深部中下地壳应变软化岩石及深部幔源物质减压释荷产生深熔岩浆并上侵，从而加速了造山带的上隆速度，并可形成地幔热柱的第三级构造单元——幔枝构造。其中隆升较快的地段发育成为典型的变质核杂岩构造。幔枝构造控制着构造变形－岩浆活动－蚀变变质－成矿作用统一体系，并形成与幔枝构造密切相关的内带为金（铜钼）、外带为银（铅锌）多金属的成矿系列。论述了不同构造部位的成矿特征及其相关性、统一性。据此提出了在有利构造部位（参照已有矿点分布）扩大找矿和向深部扩大找矿的认识。
The development of mantle plume has the characteristics of multi stage evolution. Because of the oblique intercalation of mantle materials in the up part of Hehuai sub mantle plume to Yanshan orogenic zone, and the superposition of E-W Shangyi-Chicheng ductile shear zone in the centrat part of Yanshan orogenic zone and the NNE Wulonggou-Shanghuangqi ductile shear zone in the axis of Taihangshan orogenic zone, resulted in the sofrering of deep seated (middle lower crust) rocks and depressing and unloading of mantle derived rocks to form anatectic magma. The anatectic magma intruded along the ductile shear zone, which enhanced the uplifting of the orogenic zone and formed the third order tectonic unit of the mantle plume-mantle branch structures. The cover rocks were detached loher highly nolifted metamorphosed basement rocks were exposed to form typical metamorphic core complexes. It contributed to the formation of a typical structural deformation igneous activity metamorphism metallogenies system. The metallogenic seguences with inner gold (copper, molybdenum) mineralization belt and extemal silver (lead,zinc) mineralization belt are related to mantle branch (metamorphic core complex). This paper discusses the metallogenic features of different structural positions and their genetic relation ships, which may help enlarge exploration at favourable structural positions and to depth.
基金
地矿部科技攻关项目
地矿部跨世纪科技人才培养计划
关键词
幔枝构造
变质核杂岩
成矿作用
成矿系列
杂岩
mantle branch structure, metamorphic core complex, mineralization, minerogentic series
