摘要
湖南金矿的成因类型可划分为8大类16亚类。主要类型矿床受不同大地构造单元控制。如变质热液金矿(Ⅰ)及与其相关联的岩浆热液叠加改造型金矿(Ⅳ),主要产于雪峰古陆与湘中凹陷的马山—龙山—紫云山东西向穹窿状隆起区内,成矿期为雪峰期与加里东期,后者(Ⅳ)有燕山期岩浆期后的热液叠加;岩浆热液金-铅-锌多金属矿床及岩浆热液含金多金属矿床(伴生金),均产于晚古生代地层的铜山岭—水口山—七宝山北东向深熔构造岩浆带中,成矿期为燕山期。以往金矿的勘查主要集中在前寒武系的变质热液金矿,近几年的找矿突破,已使岩浆热液金-铅-锌-银多金属矿床及第四系砂金矿床,与变质热液金矿床一起,成为该省金矿的主要类型,从而开拓了新的找矿领域。
Genetically, gold ore dcposits in Hunan may be divided into 8 majortypes and 16 subtypes. Ore deposits of main types are controlled by differentgeotectonic units. For example, metamorphic-hydrothermal gold ore deposits(Ⅰ) and their associated magmatic-hydrothermal superimposed reformation- type ones (Ⅳ)mainly occur within the Mashan-Lonshan-Ziyunshan EW-trending quaquaversal rise area between the Xuefengian ancient land andthe central Hunan sag. Their ore-forming epoches are Xuefengian andCaledonian. The latter was superimposed by Yanshanian post-magmatichydrothermal solutions; Magmatic-hydrothermal Au-Pb-Zn polymetallie oredeposits and magmatic-hydrothermal Au-bearing polymetallic ore deposits(associated gold) are located in the Lanyang-Linwu SN-trending foldzone consisting of Late Paleozoic formations. Their ore-forming epoch isYanshanian. In the past, the exploration and mining of gold ore depositswere mainly centred around Precambrian metamorphic-hydrothermal ones.As a result of a prospecting breakthrough of recent years, magmatie-hydrothermal Au-Pb-Zn-Ag polymetallic ore deposits and Quaternary placergold ore deposits, together with metamorphic-hydrothermal gold ore depositshave become the ones of main types in Hunan. Thus, a new prospectingfield has been opened up.
关键词
金矿
矿床
成矿
成因类型
gold ore deposit
metallogeny
genetic type
Hunan
