摘要
云南省金矿具有较好的成矿地球化学背景,数据离差大、变化系数特别高,分配极不均匀,在局部呈现极度贫化或极度富集现象,具有形成重大矿床的基础,找矿前景极好.在后期地质地球化学成矿作用过程中分散或富集作用非常明显,具有形成大型、超大型矿床的地球化学前提.控制金高背景的主要因素为超基性、基性、中基性,碱性岩浆岩和具有继承性的地层;低背景区主要分布于滇西地区,受酸性岩浆岩、一些元古界老变质岩、震旦系、寒武系和中生界侏罗系、白垩系控制.
Yunnan province shows a relatively promising geochemical background for Au mineralization.The Au data display a wide deviation with especially high coefficient of variation,indicating an extremely inhomogeneous Au distribution across the province.Combined with locally extraordinary Au concentration or depletion,Yunnan province is considered as an ideal target for large Au deposit exploration.Remarkable enrichment or dispersion of Au in later geo-geochemical mineralizing processes is a precondition for large and super-large Au deposit formation.The main controllers over high Au content contain ultrabasic,basic,medium-basic,akali magmatic rocks,as well as inherited strata.The backgrounds of low Au content are mainly located in the western Yunnan province,and are spatially restricted by acidic igneous rocks,ancient metamorphic rocks,and the Sinian,Cambrian,Jurassic and Cretaceous strata.
出处
《云南大学学报(自然科学版)》
CAS
CSCD
北大核心
2017年第S2期56-61,共6页
Journal of Yunnan University(Natural Sciences Edition)
基金
中国地质调查局"云南省矿产资源潜力评价"(资[2011]02-39-24号)
关键词
金
背景
异常
分散
富集
矿床
gold
background
anomaly
disperse
enrichment
ore deposit