摘要
对兰坪－思茅沉积盆地几个代表性脉状铜矿床的研究发现，矿石构造以角砾状为主；金属矿物组合中出现较多的黝铜矿系列矿物（Ｃｕ１２Ｓｂ４Ｓ１３－Ｃｕ１２Ａｓ４Ｓ１３），约占金属矿物总量的５０％以上，部分矿石达８０％以上，其中尤以砷黝铜矿占优势；矿床的元素组合以Ｃｕ－Ａｓ－Ｓｂ－Ａｇ－Ｚｎ－（Ａｕ）－（Ｈｇ）－（Ｃｏ）－（Ｇａ）为特征；脉石矿物的稀土元素表现出特异的富中组稀土（Ｓｍ－Ｈｏ）、弱或无铕异常的曲线分布模式。以上特征反映出本区脉状铜矿床成因上的特殊性，结合成矿环境的分析，本区脉状铜矿系由陆相热水沉积作用形成，从成因的角度看。
This paper reports the geological and geochemical characteristics of some typical vein copper deposits in Lanping-Simao basin,Yunnan province and discusses their hydrothermal genesis.Most of these copper deposits are located in proximity to the major active faults or the contemporaneous faults.Ore structures are mainly brecciated and massive.Metal mineral association is characterised by abundant tetrahedrite-tennantite series (Cu 12 Sb 4S 13 -Cu 12 As 4S 13 ),especially the tennantites.Element association is characterised by Cu-As-Sb-Ag-Zn-(Au)-(Hg)-(Co)-(Ga).REE patterns of vein minerals show an enrichment of middle REE (Sm-Ho) and a weak or no europium anomaly.These features,combined with the analysis of mineralization environment,lead us to conclude that the vein copper deposits in this area was formed during the continental hydrothermal sedimentation and hydrothermal boiling in the shallow portion was their main metallogenetic mechanism.They thus represent a new type of copper deposit in genetic sense.
出处
《地球化学》
CAS
CSCD
北大核心
1997年第1期54-63,共10页
Geochimica
基金
中国科学院矿床地球化学开放研究实验室基金
国家"八五"铜矿攻关项目
关键词
铜矿床
地球化学
热水沉积
成因
vein copper deposit,geochemical characteristics,continental hydrothermal sedimentation,Yunnan
