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volcano-hydrothermal solution
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     Patent Volcano
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     GRAVITY STUDY OF VOLCANO
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     Advances in volcano-climatology
     火山气候学的研究进展
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Industrial types of copper deposits consist mainly of volcano-sedimentary and sedimentary sandstone copper deposits.These deposits are related respectively to volcano-hydrothermal solution,hydrothermal metasomatism/hydrothermal sedimentation.As a special industrial type of copper resources,native copper is formed under a weak alkalic and sulphur-deficient deoxidized environment.Three conditions are necessary during ore formation,i.e.,appropriate-porosity ore-hosted rocks,extraction and migration for epithermal...

Industrial types of copper deposits consist mainly of volcano-sedimentary and sedimentary sandstone copper deposits.These deposits are related respectively to volcano-hydrothermal solution,hydrothermal metasomatism/hydrothermal sedimentation.As a special industrial type of copper resources,native copper is formed under a weak alkalic and sulphur-deficient deoxidized environment.Three conditions are necessary during ore formation,i.e.,appropriate-porosity ore-hosted rocks,extraction and migration for epithermal organic matter-enriched hydrothermal solution during water-rock reaction and deoxidized sulphur-deficient barrier belts.This paper analyses the relationship between organic matter and ore formation of copper.The study shows organism and/or organic matter plays an important role for deoxidization and concentration of native copper.However it remains to be further researched and confirmed whether there exists the organism and/or organic matter type copper deposit.Native copper deposits in South China generally display stratabound and epithermal metallogenesis involved in organic matter.This type of deposit is typical of large-area epithermal metallogenesis in the southwestern Yangtze block since the Mesozoic.Finally,the paper discusses prospecting and exploration for native copper deposit in China.

近年来的找矿进展显示,我国至少存在2种以上成因类型的自然铜矿床(矿化带):火山-沉积碎屑岩型和陆相砂页岩型等,其主要分布在扬子地块西南缘和新疆天山地区。以湘西九曲湾(麻阳)铜矿和滇东北沿河铜矿为例,结合国外典型自然铜矿床(矿化带),分析了自然铜的成矿学特征及形成条件。通过对比分析沉积砂岩铜矿(硫化物)与自然铜矿的成矿学特征,认为自然铜成矿必须具备3个条件:①孔隙度丰富而适宜的储矿岩石;②水-岩反应中有利于含铜岩石的萃取和运移的浅成低温热液(卤水);③贫硫富生物有机质的地球化学还原障壁带。研究显示,自然铜形成于碱性贫硫的还原环境中,生物有机质对自然铜的成矿起重要作用,相对封闭的成矿环境、独特的流体性质对自然铜起保护作用。我国南方的自然铜矿床一般显示出层控、浅成低温及生物有机质参与成矿等特点。最后探讨了自然铜矿床在我国的找矿勘探前景。

 
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