安徽沿江坳陷多金属成矿带控矿因素与找矿建议
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摘要
安徽沿江坳陷是长江中下游铁铜成矿带的重要组成部分,近10年来安徽新发现的具有较高经济价值的金属矿床几乎全都在该区。侵入岩体周边不同性质的围岩往往对矿床的类型具有控制作用;区域性深大断裂控制了成矿母岩的形成和分布,而具体的矿床构造(褶皱、断裂、接触带)控制着成矿有利空间(低压带)的分布;燕山中晚期中性-中酸性混熔型钙碱性岩浆岩不仅控制金属矿床的产出部位,还提供了成矿物质、热能,并产生成矿热液;矿床均围绕岩体分布,具有矿种和矿物组合等方面的水平-垂向分带;成矿时代为130~155 Ma,金属矿床分为玢岩型铁矿、夕卡岩型铁矿、斑岩型铜矿、夕卡岩型铜矿、层控型铁铜矿等5种矿床类型,各类型之间存在过渡、共生、叠加关系,构成中性-中酸性岩浆成矿系列。建议在今后的找矿工作中,要选好靶区、就矿找矿,加强中性-中酸性岩浆岩和控矿构造的研究,并注意技术方法的有效性与多解性。
Depression area along Yangtze river in Anhui province is an important part of the middle-lower Yangtze river Fe-Cu ore belt.All the economic metal deposits discovered in resent years in Anhui province are all mostly located here.Wall rocks with different properties in surroundings of intrusive body control the deposit type and regional faults control formation and distribution of the host rock.The structure(fold,fault and contact zone)controls distribution of the favorite ore space(low pressure zone).The Middle-Late Yanshanian intermediate-acidic mixed melted calcareous alkali magmatic rock not only controls location of the metal deposit but also provides ore materials and heat energy to produce ore fluid.All the deposits are distributed around the intrusive body and characterized by vertical and horizontal zoning of ore deposit type and mineral assemblages.The metallogenic period is 155 to 130 Ma.The metal deposit are divided into porphyrite Fe deposit,skarn Fe deposit,porphyry Cu deposit,skarn Cu deposit and strtabound Fe-Cu deposit.Maybe the deposits occur together or overprinted or one deposit is transferred to the other so as to constitute the intermediate-acidic metallogenic series.Proposal is made here that prospecting in future should be directed to depth and surroundings of the known deposits and attention paid to research on intermediate-acidic magmatic rock and effectiveness and multi-solution of the prospecting techniques.
Depression area along Yangtze river in Anhui province is an important part of the middle-lower Yangtze river Fe-Cu ore belt.All the economic metal deposits discovered in resent years in Anhui province are all mostly located here.Wall rocks with different properties in surroundings of intrusive body control the deposit type and regional faults control formation and distribution of the host rock.The structure(fold,fault and contact zone)controls distribution of the favorite ore space(low pressure zone).The Middle-Late Yanshanian intermediate-acidic mixed melted calcareous alkali magmatic rock not only controls location of the metal deposit but also provides ore materials and heat energy to produce ore fluid.All the deposits are distributed around the intrusive body and characterized by vertical and horizontal zoning of ore deposit type and mineral assemblages.The metallogenic period is 155 to 130 Ma.The metal deposit are divided into porphyrite Fe deposit,skarn Fe deposit,porphyry Cu deposit,skarn Cu deposit and strtabound Fe-Cu deposit.Maybe the deposits occur together or overprinted or one deposit is transferred to the other so as to constitute the intermediate-acidic metallogenic series.Proposal is made here that prospecting in future should be directed to depth and surroundings of the known deposits and attention paid to research on intermediate-acidic magmatic rock and effectiveness and multi-solution of the prospecting techniques.
引文
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1安徽省地质矿产局321地质队.安徽省铜陵市狮子山铜矿区狮子山铜矿床最终地质报告.合肥:安徽省地质矿产局,1963.
[2]唐永成,曹静平,支利庚,等.皖东南区域地质矿产评价[M].北京:地质出版社,2010:1-219.
[3]李大鹏,杜杨松,张静,等.安徽铜山矿区花岗岩闪长斑岩矿物化学与特征及成因探讨[J].地质与勘探,2011,47(5):865-875.
[4]俞仓海,袁小明.贵池铜山岩体岩石化学与地球化学特征[J].安徽地质,1999,9(3):194-198.
[5]常印佛,刘湘培,吴言昌.长江中下游铜铁成矿带[M].北京:地质出版社,1991:1-262.
[6]翟裕生,彭润民,陈从喜,等.中国重要成矿系列的形成机制和结构特征[M].北京:地质出版社,2008:1-173.
[7]郑光文,张凯,吴明安,等.安徽沙溪斑岩铜矿物探找矿方法的试验和检验[J].地质与勘探,2013,49(4):737-750.
[8]陈毓川.矿床的成矿系列[J].地学前缘,1994,1(3):90-93.
[9]池三川.隐伏矿床(体)的寻找[M].武汉:中国地质大学出版社,1988:1-117.
[10]王朝义.铜山铜钨矿控矿因素及找矿建议[J].地质与勘探,1999,35(4):19-21.
[11]俞沧海.贵池铜山铜矿床成因探讨[J].地质与勘探,2001,37(2):12-16.
[12]吴文龙,曹杰玲,张明,等.安徽省庐江县沙溪铜矿床控矿条件与找矿前景分析[J].安徽地质,2012(增刊):45-49.
[13]程长根,李勇,马冬,等.安徽省怀宁县月山朱冲地区铁铜矿床地质特征、控矿条件及找矿成果[J].安徽地质,2012(增刊):45-49.
1安徽省地质矿产局321地质队.安徽省铜陵市狮子山铜矿区狮子山铜矿床最终地质报告.合肥:安徽省地质矿产局,1963.
目录
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