福建蒲洋变质核杂岩构造及其控矿作用初探  

Puyang Metamorphic Core Complex and Its Controlover the Gold Deposits in Fujian Province

作　　者：陈柏林 吴淦国[2] 黄仁生 谢艳霞 叶允钧 

机构地区：[1]地矿部地质力学研究所,北京100081 [2]中国地质大学,北京100083 [3]福建地质矿产勘查开发局,福州350003

出　　处：《福建地质》1998年第3期139-146,共8页Geology of Fujian

基　　金：国家计委科技找矿项目!JG9471909

摘　　要：蒲洋变质核杂岩属古大陆边缘型，由变质杂岩核和基底滑脱剥离带组成，因后期构造破坏，褶叠层和未变质盖层出露不齐全。变质杂岩核为加里东期─印支期的中酸性侵入岩，具片麻状构造；基底滑脱剥离带发育于中元古界麻源群变质岩中，具片麻状构造，并在此基础上发育了中浅层次低角度正断层系。肖圾地区金矿床受变质核杂岩生成演化的控制，近核部陡倾角断裂控制石英脉型金矿床、西北侧低角度正断层控制构造蚀变岩型金矿床。从构造控矿角度分析，受低角度正断层控制的构造蚀变岩型金矿床前景很大，在该变质核杂岩东南侧的葛坑─卓地─带是寻找与肖坂类似的构造蚀变岩型金矿床的有利地区。Puyang metamorphic core complex belongs to paleo-continental margin type and iscomposted of metamorphic complex core and hasal detachment belt. Becouse of thedestruction of later structures. The fold overlaps and unmetamorphic covers are not exposedwell. The core is consisted of Caledonian-Indosinian intermediate-acid intrusive rocks withgneissic structures. And the hasal detachment belt developed among Middle ProterozoicMayuan Grop metamorphic rocks, in which there are gneissic and mylonitic structures. Basedon the belt, there developed low-angle detachment fault system. The evolution of themetamorphic core complex controlls over the distribution and types of the gold deposits inthe area. For an example, the high-angle fault near the core controlls over the quartz-veintype, while the tectonic altered rock type is controlled by the low-angle detachment fault inthe northwest side of the core. According to the structural control of the ore .deposition, it isreferred that there is a prospective gold deposit of the tectonic altered rock type in the area,especially in the southeast side of the core.

关 键 词：变质核杂岩 低角度 正断层 控矿作用 

分 类 号：P588.36[天文地球—岩石学] P613[天文地球—地质学]