摘要
本文提出福建省基底中有早前寒武纪尤溪古陆(核)、晚前寒武纪闽中裂谷及政和—泰宁裂陷带存在的看法。初步论述了古陆存在的依据、沉陷俯冲过程及其含金层(2713～1686Ma)与尤溪—上杭金矿带金矿物质来源的关系。分析了裂陷带的岩浆活动状况、沉积建造特征和构造性质,认为其中玄武岩—硅铁建造序列的上部含硅铁碳质火山碎屑沉积建造,是政和—泰宁金矿带金矿的矿源层(800—700Ma);早加里东期超基性岩,属含金侵入岩(500Ma)。讨论了裂谷的表现形式、活动特征和相邻构造关系以及两条金矿带古构造环境间的成生联系。对福建今后找金工作提出几点讨论性意见。
The paper presents that there are an early Precambrian Youxi old land (core), a late Preeambrian Mid-Fujian Rift and a Zhenghe--Taining aulacogen in the basement of Fujian Province. The author discusses and analyses the evidences for old land existence, the process of sag subduction, the relationship between gold-bearing layers and source material of Youxi--Shanghang gold-mineralization area, the magmatism of aulacogen area, the features of sedimentary formation and tectonics, and , consequently, concludes that 1) the silica-ferric-carbonaceous pyroclasts sedimentary formation in upper basalt-silicaferric formation sequence is a source-bed of Zhenghe- Taining gold-mineralization zone (800-700Ma); 2) the early Caledonian ultrabasic rocks belong to gold-bearing intrusive rocks (500Ma). Besides, the appearance and active features of the rift, its relation with adjacent tectonics, and the genetic relationship between two different palaeotectonic environments of gold-mineralization zones are discussed while some opinions about gold investigation in Fujian Province are presented as well.
出处
《福建地质》
1991年第1期34-48,共15页
Geology of Fujian
