云南东川观音山铜矿矿床地质特征及找矿标志
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摘要
观音山铜矿是东川"五层楼"成矿系列中的沉积-热液改造型铜矿,发育"上铜下铁"的空间矿化结构。结合矿区相关地质工作成果,对矿床地质特征、成矿条件、矿床成因等进行分析,得出以下结论:1)矿(化)体主要赋存于大营盘组二段(Pt_2d~2)碳-硅质板岩中,矿体呈层状、透镜状产出,自上而下发育3层矿化;2)矿床金属矿物以黄铜矿、黄铁矿为主,次生氧化物为孔雀石,以脉状、条纹状、浸染状等沉积型矿石结构构造为主;3)矿床的形成严格受控于沉积构造环境、岩相古地理、含矿建造及成矿环境等,总体属砂页岩-碎屑岩建造的沉积-变质-改造型铜矿床;4)"观音山式"铜矿具有显著的层、相、位专属性,其落因带西侧大营盘组出露地区成矿条件较好,是寻找观音山式铜矿的重点找矿靶区。
Guanyinshan copper deposit, located in Dongchuan, is one sedimentary-hydrothermal reformation type, belonging to ‘five-story' metallogenic series with ‘cooper-up-iron-down' spatial structure. This paper analyzes its deposit geology, mineralization conditions and genesis based on research results. The major orebodies are hosted in Member 2 of Dayingpan formation(Pt_2d~2) carbonaceous-siliceous slate occurring as stratified or lens-like with 3 ore beds. Metallic minerals are mainly chalcopyrite and pyrite with secondary malachite, textures are vein-like, striped or disseminated. Deposit is formed under control of sedimentary structural environment, lithofacies paleogeography and ore-bearing formation, generally a sedimentary meta-reformed cooper deposit in sandy shale-debris formation. Guanyinshan cooper deposit is exclusively of typical strata, lithofacies and locality. Dayingpan strata are well exposed in its west, where may be of potential to look for Guanyinshan-style cooper deposits.
Guanyinshan copper deposit, located in Dongchuan, is one sedimentary-hydrothermal reformation type, belonging to ‘five-story' metallogenic series with ‘cooper-up-iron-down' spatial structure. This paper analyzes its deposit geology, mineralization conditions and genesis based on research results. The major orebodies are hosted in Member 2 of Dayingpan formation(Pt_2d~2) carbonaceous-siliceous slate occurring as stratified or lens-like with 3 ore beds. Metallic minerals are mainly chalcopyrite and pyrite with secondary malachite, textures are vein-like, striped or disseminated. Deposit is formed under control of sedimentary structural environment, lithofacies paleogeography and ore-bearing formation, generally a sedimentary meta-reformed cooper deposit in sandy shale-debris formation. Guanyinshan cooper deposit is exclusively of typical strata, lithofacies and locality. Dayingpan strata are well exposed in its west, where may be of potential to look for Guanyinshan-style cooper deposits.
引文
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薛力鹏,张贤峰,杨永富,等,2014.滇中东川地区观音山铜矿床成矿规律及找矿方向[J].矿产与地质,28(6):720- 724.
晏建国,莫向云,杨灿,等,2013.云南东川“观音山式”铜矿地质特征及找矿意义[J].地球学报,34(S1):10- 16.
杨金富,谢天宇,和浪涛,等,2017.东川铜矿田一、四棵树铜矿地质特征及找矿前景[J].金属矿山 (3):102- 109.
喻国东,2011.东川稀矿山式铜矿控矿条件新认识[J].云南地质,30(3):316- 320.
高辉,裴荣富,王安建,等,2012.海相砂页岩型铜矿成矿模式与地质对比:以中国云南东川铜矿和阿富汗安纳克铜矿为例[J].地质通报,31(8):1332- 1343.
蒋小芳,王生伟,廖震文,等,2015.四川会东油房沟Re-Os同位素年龄及其地质意义[J].大地构造与成矿学,39(5):866- 875.
李志伟,钱祥贵,田敏,2000.东川拖布卡—布卡地区金矿地质特征及找矿意义[J].大地构造与成矿学,24(1):37- 43.
李元龙,胡煜昭,2013.云南东川稀矿山式铜铁矿床成矿物质来源的同位素示踪[J].岩石矿物学杂志,32(2):169- 179.
刘卫明,刘继顺,刘文恒,等,2012.桃园式铜矿矿床地质特征及其控矿因素分析[J].地质找矿论丛,27(3):278- 283.
刘卫明,刘继顺,张彩华,等,2011.滥泥坪铜矿东川式铜矿的发现及找矿潜力分析[J].有色金属:矿山部分,63(4):25- 28.
刘文恒,刘继顺,马慧英,等,2014.云南东川雪岭铜多金属矿区硫铅同位素组成特征及成矿物质来源[J].中南大学学报:自然科学版(8):2728- 2739.
柳玉龙,方维萱,潘含江,等,2011.云南东川铜矿滥泥坪矿区辉长岩-闪长岩岩体成矿特征[J].矿产与地质,25(2):143- 147.
牟传龙,林仕良,余谦,2000.四川会理—会东及邻区中元古界昆阳群沉积特征及演化[J].沉积与特提斯地质,20(1):44- 51.
邱华宁,WIJBRANS J R,李献华,等,2002.东川式层状铜矿40Ar-39Ar成矿年龄研究:华南地区晋宁—澄江期成矿作用新证据[J].矿床地质,21(2):129- 135.
冉崇英,吴鹏,2014.东川—易门式铜矿床成矿作用研究的几个问题[J].大地构造与成矿学,38(4):848- 854.
孙志明,尹福光,关俊雷,等,2009.云南东川地区昆阳群黑山组凝灰岩锆石SHRIMP U-Pb测年龄及其地层学意义[J].地质通报,28(7):896- 900.
王生伟,廖震文,孙晓明,等,2013.云南东川铜矿区古元古代辉绿岩地球化学:Columbia超级大陆裂解在扬子陆块西南缘的响应[J].地质学报,87(12):1834- 1852.
王子正,周邦国,郭阳,等,2012.扬子地台西缘淌塘花岗岩的地球化学特征及锆石U-Pb定年[J].岩石矿物学杂志,31(5):652- 662.
薛力鹏,张贤峰,杨永富,等,2014.滇中东川地区观音山铜矿床成矿规律及找矿方向[J].矿产与地质,28(6):720- 724.
晏建国,莫向云,杨灿,等,2013.云南东川“观音山式”铜矿地质特征及找矿意义[J].地球学报,34(S1):10- 16.
杨金富,谢天宇,和浪涛,等,2017.东川铜矿田一、四棵树铜矿地质特征及找矿前景[J].金属矿山 (3):102- 109.
喻国东,2011.东川稀矿山式铜矿控矿条件新认识[J].云南地质,30(3):316- 320.