摘要
在对湘南中生代区域成矿构造进行研究的过程中发现了热柱三叉断裂构造,认为这种构造是燕山早期地幔对流活动在岩石圈形成的一种构造型式。其主要证据包括:湘南有色金属矿床呈3个不同方向的线状分布;其交汇中心与湘南穹窿构造中心吻合;构造系统中矿床和成矿岩体具有同时性。已有花岗岩和火山岩的地质、地球化学研究表明,燕山期华南深部存在地幔活动,这为湘南发育热柱三叉断裂构造提供了深部构造背景支持。三叉断裂构造型式的发现和认识为湘南成矿作用和成矿规律研究提供了新的构造模型。
The mesozoic metallogenesis and tectonics in southern Hunan, China, were studied, and a triple junction was found. It is a tectonic pattern in lithosphere and its forming mechanism may be attributed to mantle convection in early Yanshanian. The main evidences for triple junction are shown as follows： the nonferrous metal deposits in southern Hunan distribute in line style in three directions; convergence center of distribution lines of nonferrous metal deposits coincide with the centre of southern Hunan dome; these deposits and their hosting granites in the triple junction system are isochronic. Geological and geochemical studies on the granite and volcanics indicate that there exist mantle activities in deep crust of southern China, which is a deep tectonic background support to the triple junction developed in southern Hunan. The finding and viewpoint of triple junction tectonic pattern in southern Hunan bring out a new tectonic model to discuss metallogenesis and its rules in this area.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2013年第9期2613-2620,共8页
The Chinese Journal of Nonferrous Metals
基金
中国地质调查局地质矿产调查评价专项(1212011121116
1212011085372)
湖南省重点学科建设项目
关键词
三叉断裂
地幔柱
华南地区
花岗岩
成矿作用
triple junction
mantle plume
southern China
granite
metallogenesis
