云南东川滥泥坪铜矿矿床成因及找矿标志
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摘要
东川矿田是我国滇中地区重要的铜矿产地,岩浆活动频繁,构造运动复杂,成矿条件优越。通过系统的资料收集及详实的野外地质调查,归纳总结了滥泥坪铜矿控矿规律,并结合坑/钻探工程验证成果,进一步总结了矿区找矿标志。研究表明:①矿区主要出露昆阳群地层,陡山沱组一段(Z_2d~1)、落雪组一段(Pt_2l~1)、因民组三段(Pt_2y~3)分别赋存有滥泥坪式铜矿、东川式铜矿及稀矿山式铜铁矿,层控性显著;②矿床金属矿物主要为黄铜矿、斑铜矿、磁铁矿及赤铁矿,因民组铜矿石以热液脉型构造为主,落雪组铜矿石则以沉积型构造为主;③矿床严格受地层、构造(褶皱、断裂)及岩相古地理环境控制,为火山喷流沉积—热液叠加改造型矿床;④矿床继承了矿集区矿床的典型特征,具有裂谷、岩浆岩、构造、盆地、层位、岩相共6个找矿标志,本部矿段—白锡腊矿段过渡区域及Ⅲ~#矿体群北延区域具有良好的找矿前景。
Dongchuan Ore Field is one of the important copper bases of Central Yunnan Province,which is characterized by frequent magmatism,complicated tectonic-movement and superior metalloginic condition.Based on the system data collection and detailed field geological investigation,the ore-controlling regularity is summarized,and the prospecting indicators are discussed based on the verification results of pitting/drilling engineering.The study results show that:①the mining area has mainly occurred Kunyang Group,the first member of Doushantuo Formation, first member of Luoxue Formation and third member of Yinmin Formation have hosted Lanniping-type copper deposit,Dongchuan-type copper deposit and Xikuangshan-type delafossite,which is characterized by strata-bound;②the ore metals are mainly for chalcopyrite,bornite,magnetite and hematite,the copper ore of Yinmin Formation is mainly characterized by hydrothermal-vein type texture,and the cooper ore of Luoxue Formation is characterized by sedimentary-type texture;③Lanniping Copper Deposit is strictly controlled by strata,tectonic(fold,fault) and ancient geographic situation of lithogacies,which belongs to volcanic effusion deposition-hydrothermal superimposition and reworking deposit;④Lanniping Copper Deposit inherited the typical characteristics of the deposits in ore-concentrated area,the prospecting indicators of Lanniping Copper Deposit including rift,magmatic rock,tectonic,basin,horizon and lithofacies,the transition region between headguarters ore section-Baixila ore section and the north extending part of Ⅲ~# orebody group have favorable prospecting potential.
Dongchuan Ore Field is one of the important copper bases of Central Yunnan Province,which is characterized by frequent magmatism,complicated tectonic-movement and superior metalloginic condition.Based on the system data collection and detailed field geological investigation,the ore-controlling regularity is summarized,and the prospecting indicators are discussed based on the verification results of pitting/drilling engineering.The study results show that:①the mining area has mainly occurred Kunyang Group,the first member of Doushantuo Formation, first member of Luoxue Formation and third member of Yinmin Formation have hosted Lanniping-type copper deposit,Dongchuan-type copper deposit and Xikuangshan-type delafossite,which is characterized by strata-bound;②the ore metals are mainly for chalcopyrite,bornite,magnetite and hematite,the copper ore of Yinmin Formation is mainly characterized by hydrothermal-vein type texture,and the cooper ore of Luoxue Formation is characterized by sedimentary-type texture;③Lanniping Copper Deposit is strictly controlled by strata,tectonic(fold,fault) and ancient geographic situation of lithogacies,which belongs to volcanic effusion deposition-hydrothermal superimposition and reworking deposit;④Lanniping Copper Deposit inherited the typical characteristics of the deposits in ore-concentrated area,the prospecting indicators of Lanniping Copper Deposit including rift,magmatic rock,tectonic,basin,horizon and lithofacies,the transition region between headguarters ore section-Baixila ore section and the north extending part of Ⅲ~# orebody group have favorable prospecting potential.
引文
[1] 代鸿章,刘家军,朱文兵.云南因民铜矿床沉积构造环境及成矿地质研究[J].地学前缘,2018(1):108-124.
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[12] 聂天,方维萱,杜玉龙.云南东川因民铁铜矿区落因复式褶皱-断裂带与控矿规律研究[J].大地构造与成矿学,2014,38(4):813-821.
[13] 方维萱,柳玉龙,张守林.全球铁氧化物铜金型(IOCG)矿床的三大类大陆动力学背景与成矿模式[J].西北大学学报(自然科学版),2009,39(3):404-413.
[14] 李毅,李赋屏,何国朝.东川蓑衣坡硅质型铜矿床的地质地球化学特征及成因[J].矿床地质,2005,24(1):26-35.
[15] 潘含江,方维萱,郭茂华.云南东川铜矿硅质白云岩稀土元素地球化学特征[J].矿产与地质,2008,22(4):242-246.
[16] 吴利仁,刘若新,梅厚钧,等.云南某地基性岩岩石学上的一些问题[J].地质科学,1959,2(12):354-364.
[17] 吴利仁.板块构造及火山学的新进展[J].矿物岩石地球化学通报,1968,7(3):142-145.
[2] 高辉,裴荣富,王安建,等.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,2012,31(8):1332-1351.
[3] 邱华宁,WIJBRANS J R,李献华,等.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,2002,21(2):129-136.
[4] 冉崇英,吴鹏.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,2014,38(4):848-854.
[5] 李毅,李赋屏,何国朝.东川蓑衣坡硅质岩型铜矿床的地质地球化学特征及成因[J].矿床地质,2005,24(1):71-80.
[6] 王生伟,廖震文,孙晓明,等.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,2013,87(12):1834-1852.
[7] 聂天,方维萱.浅谈云南东川铜矿区两种矿床及探矿远景[J].矿物学报,2011(S1):972-973.
[8] 郭远生.云南“东川式”铜矿床找矿实践与新进展[J].矿产与地质,2010,24(4):289-293.
[9] 黄小文,漆亮,赵新福,等.云南东川汤丹铜矿硫化物的Re-Os年代学研究[J].矿物学报,2011(S1):594.
[10] 叶霖,刘玉平,李朝阳,等.东川桃园式铜矿Ar-Ar同位素年龄及意义[J].矿物岩石,2004,24(2):57-60.
[11] 李元龙,胡煜昭.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,2013,32(2):167-179.
[12] 聂天,方维萱,杜玉龙.云南东川因民铁铜矿区落因复式褶皱-断裂带与控矿规律研究[J].大地构造与成矿学,2014,38(4):813-821.
[13] 方维萱,柳玉龙,张守林.全球铁氧化物铜金型(IOCG)矿床的三大类大陆动力学背景与成矿模式[J].西北大学学报(自然科学版),2009,39(3):404-413.
[14] 李毅,李赋屏,何国朝.东川蓑衣坡硅质型铜矿床的地质地球化学特征及成因[J].矿床地质,2005,24(1):26-35.
[15] 潘含江,方维萱,郭茂华.云南东川铜矿硅质白云岩稀土元素地球化学特征[J].矿产与地质,2008,22(4):242-246.
[16] 吴利仁,刘若新,梅厚钧,等.云南某地基性岩岩石学上的一些问题[J].地质科学,1959,2(12):354-364.
[17] 吴利仁.板块构造及火山学的新进展[J].矿物岩石地球化学通报,1968,7(3):142-145.
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