晋蒙地体集宁群金红石成矿规律研究
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摘要
根据晋蒙地体集宁群上部孔兹岩系和下部麻粒岩系的不整合构造接触,将本区划分为4个构造单元。通过对集宁群岩石学特征的分析及变质原岩的恢复,分析出其沉积环境具有差异。同时依据麻粒岩系形成于晚太古代而孔兹岩系形成于早元古代,对金红石的形成过程进行反演,推断其第一次主成矿期为阜平期,含矿岩层为集宁群下部麻粒岩系,右所堡组含石墨黑云角闪片麻岩。后经吕梁期地层重熔成矿物质迁移,最终在集宁群上部孔兹岩系下白窑组下段富集成矿,矿石岩性为含夕线石榴二长浅粒岩。
According to unconformity contact structure between Khondalite series and Granulited series,we divided the Jining rock group was divided into 4 tectonic units.Based on petrological features and restructuring of the protolith of Jining rock group,the differences in sedimentary environment was found.At the same time,given that Granulite series formed in the late archean,but Khondalite series formed in early proterozoic,it was infered that the first main metallogenic stage for rutile was in Fuping period.The ore strata was Jining rock group of Granulite series.You Suobao group contained gneiss of graphite,biotite,hornblende.Afterward,the Lvliang period,the above minerals transformed ore-forming mineral,which transferred and finally enriched in the Xia Baiyao group of the Khondalite series of Jining rock group.The lithology was two feldspar leptite containing sillimanite and garnet.
According to unconformity contact structure between Khondalite series and Granulited series,we divided the Jining rock group was divided into 4 tectonic units.Based on petrological features and restructuring of the protolith of Jining rock group,the differences in sedimentary environment was found.At the same time,given that Granulite series formed in the late archean,but Khondalite series formed in early proterozoic,it was infered that the first main metallogenic stage for rutile was in Fuping period.The ore strata was Jining rock group of Granulite series.You Suobao group contained gneiss of graphite,biotite,hornblende.Afterward,the Lvliang period,the above minerals transformed ore-forming mineral,which transferred and finally enriched in the Xia Baiyao group of the Khondalite series of Jining rock group.The lithology was two feldspar leptite containing sillimanite and garnet.
引文
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[13]杨欢,冶玉花,王登科.变质岩中金红石研究综述[J].四川地质学报,2013,33(1):120-125.
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[15]孙大中.探索地球早期历史的秘密[J].中国科学院院刊,1993(4):344-345.
[2]吴昌华,钟长汀,陈强安.晋蒙高级地体孔兹岩系的时代[J].岩石学报,1997,13(3):18-31.
[3]刘金中,钱祥麟,陈亚平.中国内蒙中部孔兹岩系中石墨矿的构造成因[J].大地构造与成矿学,1989(2):162-167.
[4]翟明国,彭澎.华北克拉通古元古代构造事件[J].岩石学报,2007,23(11):2665-2682.
[5]沈其韩,张荫芳.内蒙古中南部早前寒武系变质岩原岩建造和变质作用特征[J].中国地质科学院院报,1990(1):41-43.
[6]侯克斌,吴家富,马闯,等.集宁岩群孔兹岩系的变质岩石学特征和沉积环境浅析[J].安徽地质,2013,23(1):7-12.
[7]阎月华,刘文军.关于内蒙与晋冀交界地区早前寒武纪灰片麻岩和孔兹岩的讨论[J].岩石学报,1996,12(2):163-176.
[8]徐仲元,刘正宏,胡风翔,等.内蒙古大青山地区孔兹岩系中钙硅酸盐岩的组成和地球化学特征[J].吉林大学学报(地球科学版),2005,35(6):681-689.
[9]沈其韩,刘敦一,王平,等.内蒙集宁群变质岩系U-Pb和Rb-Sr协同位素年龄的讨论[J].中国地质科学院院报,1987,9(2):165-178.
[10]吴昌华,李惠民,钟长汀,等.内蒙古黄土窑孔兹岩系的锆石与金红石年龄研究[J].地质论评,1998,44(6):618-626.
[11]高华.晋冀蒙交界地区孔兹岩系构造演化[J].西部探矿工程,2006,18(12):121-123,125.
[12]刘源骏.再论金红石矿床在变质过程中的成矿机制(以湖北大阜山金红石矿床为例)[J].湖北地质,1996,30(1):107-115.
[13]杨欢,冶玉花,王登科.变质岩中金红石研究综述[J].四川地质学报,2013,33(1):120-125.
[14]马杏桓,白瑾,索书田,等.中国前寒武纪构造格架及研究方法[J].北京:地质出版社,1987:77-93.
[15]孙大中.探索地球早期历史的秘密[J].中国科学院院刊,1993(4):344-345.