海南岛抱伦金矿床成矿后断裂活动及找矿方向探讨
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摘要
抱伦金矿是大型以含金石英脉为主的金矿床,赋矿围岩是下志留统陀烈组浅变质碎屑岩,矿脉走向为北北西向。北东走向的F_2断层将各条矿化带分成北段和南段。在F_2断层两盘很大范围内,北西盘是陀烈组下段岩石,南东盘是陀烈组中段岩石。在巷道中见到多条伴生的切错含金石英脉的小型北东向左行扭动断层。据此认为F_2断层是大断距左行扭动的成矿后断层;南矿区开采的矿化带与其北侧的4号矿化带北段不是同一条矿化带;各条矿化带的南段相对于它们的北段有较大断距的左行错移。由此得出本矿区的构造格架是:被成矿后北东向断层切断并大断距左行错移的多条北北西向矿化带。在此新的构造概念下,对抱伦金矿的进一步找矿方向提出了四个推断,涉及寻找1号矿化带南段、北区疑4号带、其他一些矿化带南段和F_2断层两盘陀烈组下段和中段界线。
The Baolun gold deposit is a large-size quartz vein type Au deposit hosted in a suite of low-grade metamorphosed clastic rocks of the lower Silurian Tuolie Formation. The deposit comprises a series of NNW-trending ore veins. The NE-trending fault F_2 traverses the deposit, and divides every major auriferous veins into northern and southern segments. The NW and SE sides of the F_2 fault are mostly the lower and middle parts of the Tuolie Formation respectively. In the mining tunnel, numerous sinistral small-scale NE-trending faults crosscut the auriferous quartz veins. Therefore, it is clear that the F_2 fault is a post-mineralization large-scale strike-slip fault which cut all of auriferous veins with a left-lateral movement. As a result, the No.4 mineralized zones in the northern parts and southern parts of the mining area could not be a continuous ore zone as was previously believed. The structural framework of the mining area is characterized by a number of NNW-trending mineralized zones that cut and significantly displaced by a NE-trending post-mineralization fault. Under such tectonic regime, four target areas are proposed for further exploration:(1) the southern part of the No.1 mineralized zone,(2) the northern part of the suspicious No.4 mineralized zone,(3) the southern segments of the other mineralized zones, and(4) the boundaries between the lower and the middle members of the Tuolie Formation in the either sides of F_2 fault.
The Baolun gold deposit is a large-size quartz vein type Au deposit hosted in a suite of low-grade metamorphosed clastic rocks of the lower Silurian Tuolie Formation. The deposit comprises a series of NNW-trending ore veins. The NE-trending fault F_2 traverses the deposit, and divides every major auriferous veins into northern and southern segments. The NW and SE sides of the F_2 fault are mostly the lower and middle parts of the Tuolie Formation respectively. In the mining tunnel, numerous sinistral small-scale NE-trending faults crosscut the auriferous quartz veins. Therefore, it is clear that the F_2 fault is a post-mineralization large-scale strike-slip fault which cut all of auriferous veins with a left-lateral movement. As a result, the No.4 mineralized zones in the northern parts and southern parts of the mining area could not be a continuous ore zone as was previously believed. The structural framework of the mining area is characterized by a number of NNW-trending mineralized zones that cut and significantly displaced by a NE-trending post-mineralization fault. Under such tectonic regime, four target areas are proposed for further exploration:(1) the southern part of the No.1 mineralized zone,(2) the northern part of the suspicious No.4 mineralized zone,(3) the southern segments of the other mineralized zones, and(4) the boundaries between the lower and the middle members of the Tuolie Formation in the either sides of F_2 fault.
引文
陈柏林,丁式江,李中坚,董法先,廖香俊,舒斌,符锋,傅杨荣,董诚.2001.海南抱伦金矿床成矿时代研究.地球化学,30(6):525-531.
陈柏林,李中坚,董诚,丁式江,舒斌,廖香俊,董法先,傅杨荣.2004.海南抱伦金矿床控矿构造特征及其对金矿化的控制作用.中国地质,31(2):139-146.
陈颖民,傅杨荣,周迎春,周慧文,薛开文.2011.海南乐东抱伦金矿床控矿构造特征及主成矿期年代学研究.黄金,32(3):16-23.
丁式江,傅杨荣,杨立强,邓军,廖香俊,吴国爱,符峰.2007.海南乐东抱伦金矿地质及成矿预测.北京:地质出版社:1-265.
丁式江,黄香定,李中坚,傅杨荣,董法先,舒斌,张小文.2001.海南抱伦金矿地质特征及其成矿作用.中国地质,28(5):28-34.
符国祥,符策锐.1999.海南岛抱伦金矿区发现微古植物化石.中国区域地质,18(1):110-111.
傅杨荣,张小文,何玉生,林弟,王成,杨朝云,高鹏,岑锐,文玲,张前,文晓敏,邢忠,黄蓉,刘章存,胡云翔,赵典苏.2016.海南省乐东县抱伦金矿接替资源勘察报告.海口:海南山金矿业有限公司,海南省地质调查院:1-230.
胡国成,吴传军,许德如,蔡建新,王智琳,单强,张小文,侯茂洲,于亮亮.2016.海南抱伦矿区构造变形、成矿时代与金矿化关系研究.大地构造与成矿学,40(2):367-376.
李明艳,刘玉琳,李相波.2006.海南抱伦造山型金矿的确认.矿床地质,25(S1):23-26.
刘玉琳,丁式江,张小文,傅杨荣.2002.海南乐东抱伦金矿床成矿时代研究.地质论评,48(S1):84-87.
舒斌,王平安,董法先,李中坚.2006a.海南乐东地区抱伦金矿矿石特征及其成因矿物学意义.地质通报,25(6):745-755.
舒斌,王平安,董法先,李中坚.2006b.海南西南部抱伦金矿流体包裹体及稳定同位素特征.地质通报,25(7):880-893.
舒斌,王平安,李中坚,陈柏林,董法先.2004.海南抱伦金矿的成矿时代研究及其意义.现代地质,18(3):316-320.
王朝文,洪汉烈,钟增球,张小文,王婧,李方林,徐亚军.2011.海南抱伦金矿含金石英脉流体包裹体特征及其意义.地球科学,36(6):1009-1020.
王婧,周汉文,钟增球,张小文,向华.2013.海南抱伦金矿床流体演化与成矿作用.中国矿业,22(1):76-82.
吴传军,许德如,傅杨荣,杨昌松,周迎春,王智琳,付王伟.2011.海南岛重要类型金矿床成矿规律与成矿机制研究.矿物学报,28(S1):873-874.
谢才富,朱金初,丁式江,张业明,陈沐龙,傅杨荣,付太安,李志宏.2006.海南尖峰岭花岗岩体的形成时代、成因及其与抱伦金矿的关系.岩石学报,22(10):2493-2508.
徐亚军,王立国.2010.海南乐东抱伦金矿扩大矿产规模可能性的地质研究.武汉:中国地质大学(武汉)地球科学学院,海口:海南山金矿业有限公司,海南省地质综合勘察院内部研究报告:1-109
许德如,傅杨荣,杨昌松,王智琳,张小文,吴传军,付王伟.2011.海南抱伦金矿床主要研究进展与关键科学问题讨论.矿物学报,28(S1):984-985.
许德如,单强,张湖,吴传军,何玉生,刘志荣,林弟,刘永堂,于学元,高鹏,张小文,侯茂洲.2016.“海南省乐东县抱伦金矿接替资源勘查项目”综合研究专题报告.广州:中国科学院广州地球化学研究所,海口:海南省地质调查院,海南山金矿业有限公司内部研究报告:1-359.
杨念,洪汉烈,张小文,向华,钟增球.2009.海南乐东抱伦金矿金矿物的特征研究.矿物岩石,29(2):31-37.
张小文.2014.海南抱伦金矿矿床成因与深部矿体预测研究.武汉:中国地质大学博士学位论文:1-91.
张小文,向华,钟增球,周汉文,张利,杨念,王婧.2009.海南尖峰岭岩体热液锆石U-Pb定年及微量元素研究:对热液作用及抱伦金矿成矿时代的限定.地球科学,34(6):921-930.
钟增球,张小文,傅杨荣,李方林,刘永堂,陈沐龙,洪汉烈,王武,林弟,王朝文,高鹏,邢增浪,徐亚军,王立国.2010.海南乐东抱伦金矿扩大矿产规模可能性的地质研究.中国地质大学(武汉)地球科学学院,海南山金矿业有限公司,海南省地质综合勘察院,内部研究报告:1-109.
Xu D R,Wang Z L,Wu C J,Zhou Y Q,Shan Q,Hou M Z,Fu Y R and Zhang X W.2017.Mesozoic gold mineralization in Hainan province of South China:Genetic types,geological characteristics and geodynamic settings.Journal of Asian Earth Sciences,137:80-108.
陈柏林,李中坚,董诚,丁式江,舒斌,廖香俊,董法先,傅杨荣.2004.海南抱伦金矿床控矿构造特征及其对金矿化的控制作用.中国地质,31(2):139-146.
陈颖民,傅杨荣,周迎春,周慧文,薛开文.2011.海南乐东抱伦金矿床控矿构造特征及主成矿期年代学研究.黄金,32(3):16-23.
丁式江,傅杨荣,杨立强,邓军,廖香俊,吴国爱,符峰.2007.海南乐东抱伦金矿地质及成矿预测.北京:地质出版社:1-265.
丁式江,黄香定,李中坚,傅杨荣,董法先,舒斌,张小文.2001.海南抱伦金矿地质特征及其成矿作用.中国地质,28(5):28-34.
符国祥,符策锐.1999.海南岛抱伦金矿区发现微古植物化石.中国区域地质,18(1):110-111.
傅杨荣,张小文,何玉生,林弟,王成,杨朝云,高鹏,岑锐,文玲,张前,文晓敏,邢忠,黄蓉,刘章存,胡云翔,赵典苏.2016.海南省乐东县抱伦金矿接替资源勘察报告.海口:海南山金矿业有限公司,海南省地质调查院:1-230.
胡国成,吴传军,许德如,蔡建新,王智琳,单强,张小文,侯茂洲,于亮亮.2016.海南抱伦矿区构造变形、成矿时代与金矿化关系研究.大地构造与成矿学,40(2):367-376.
李明艳,刘玉琳,李相波.2006.海南抱伦造山型金矿的确认.矿床地质,25(S1):23-26.
刘玉琳,丁式江,张小文,傅杨荣.2002.海南乐东抱伦金矿床成矿时代研究.地质论评,48(S1):84-87.
舒斌,王平安,董法先,李中坚.2006a.海南乐东地区抱伦金矿矿石特征及其成因矿物学意义.地质通报,25(6):745-755.
舒斌,王平安,董法先,李中坚.2006b.海南西南部抱伦金矿流体包裹体及稳定同位素特征.地质通报,25(7):880-893.
舒斌,王平安,李中坚,陈柏林,董法先.2004.海南抱伦金矿的成矿时代研究及其意义.现代地质,18(3):316-320.
王朝文,洪汉烈,钟增球,张小文,王婧,李方林,徐亚军.2011.海南抱伦金矿含金石英脉流体包裹体特征及其意义.地球科学,36(6):1009-1020.
王婧,周汉文,钟增球,张小文,向华.2013.海南抱伦金矿床流体演化与成矿作用.中国矿业,22(1):76-82.
吴传军,许德如,傅杨荣,杨昌松,周迎春,王智琳,付王伟.2011.海南岛重要类型金矿床成矿规律与成矿机制研究.矿物学报,28(S1):873-874.
谢才富,朱金初,丁式江,张业明,陈沐龙,傅杨荣,付太安,李志宏.2006.海南尖峰岭花岗岩体的形成时代、成因及其与抱伦金矿的关系.岩石学报,22(10):2493-2508.
徐亚军,王立国.2010.海南乐东抱伦金矿扩大矿产规模可能性的地质研究.武汉:中国地质大学(武汉)地球科学学院,海口:海南山金矿业有限公司,海南省地质综合勘察院内部研究报告:1-109
许德如,傅杨荣,杨昌松,王智琳,张小文,吴传军,付王伟.2011.海南抱伦金矿床主要研究进展与关键科学问题讨论.矿物学报,28(S1):984-985.
许德如,单强,张湖,吴传军,何玉生,刘志荣,林弟,刘永堂,于学元,高鹏,张小文,侯茂洲.2016.“海南省乐东县抱伦金矿接替资源勘查项目”综合研究专题报告.广州:中国科学院广州地球化学研究所,海口:海南省地质调查院,海南山金矿业有限公司内部研究报告:1-359.
杨念,洪汉烈,张小文,向华,钟增球.2009.海南乐东抱伦金矿金矿物的特征研究.矿物岩石,29(2):31-37.
张小文.2014.海南抱伦金矿矿床成因与深部矿体预测研究.武汉:中国地质大学博士学位论文:1-91.
张小文,向华,钟增球,周汉文,张利,杨念,王婧.2009.海南尖峰岭岩体热液锆石U-Pb定年及微量元素研究:对热液作用及抱伦金矿成矿时代的限定.地球科学,34(6):921-930.
钟增球,张小文,傅杨荣,李方林,刘永堂,陈沐龙,洪汉烈,王武,林弟,王朝文,高鹏,邢增浪,徐亚军,王立国.2010.海南乐东抱伦金矿扩大矿产规模可能性的地质研究.中国地质大学(武汉)地球科学学院,海南山金矿业有限公司,海南省地质综合勘察院,内部研究报告:1-109.
Xu D R,Wang Z L,Wu C J,Zhou Y Q,Shan Q,Hou M Z,Fu Y R and Zhang X W.2017.Mesozoic gold mineralization in Hainan province of South China:Genetic types,geological characteristics and geodynamic settings.Journal of Asian Earth Sciences,137:80-108.