广东大宝山北部层状矿体硫化物Re-Os测年及指示
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摘要
广东省大宝山铜多金属矿,近年来在北部新发现层状铜硫矿体,新增铜资源量20.6万吨,与采区内层状铜硫主矿体特征基本一致。为解决层状铜硫矿体的成矿时代问题,采集北部层状矿体的块状硫化物矿石样品,首次直接对黄铜矿和磁黄铁矿开展Re-Os测年,探讨成矿时代,并分析矿床成因。黄铜矿样品的Re-Os等时线年龄为(243±41)Ma(MSWD=3.1),磁黄铁矿样品的Re-Os等时线年龄为(410±16)Ma(MSWD=15),指示黄铜矿的形成可能晚于磁黄铁矿,加里东期是否存在成矿事件仍需进一步研究。黄铜矿与磁黄铁矿的矿石学研究表明,黄铜矿交代磁黄铁矿,前者形成晚于后者,结合采区地质填图结果,认为大宝山矿区及外围属于一个大的岩浆成矿系统,存在多期次岩浆侵位,主体可能属于燕山期与岩浆热液有关的成岩成矿事件。
The Dabaoshan copper polymetallic deposit,has increased its copper metal resources about 206000 tons owing to the north stratiform copper orebody found in recent years which is similar to the main stratiform copper-sulfur orebody in the pit.In order to solve the mineralization time issue of this stratiform copper orebody,massive sulfide ore samples were collected from this north copper orebody.Re-Os dating of chalcopyrite and pyrrhotite was carried out to determine the mineralization time and analyze the genesis of copper ore deposit.Re-Os isochron age of chalcopyrite is 243±41 Ma(MSWD=3.1)and isochron age of pyrrhotite is 410±16 Ma(MSWD=15),indicating the formation of chalcopyrite may be later than that of pyrrhotite.But whether there is a mineralization event in the Caledonian should be considered more carefully with more study.The ore mineralogic study of chalcopyrite and pyrrhotite shows that the chalcopyrite had replaced pyrrhotite,which suggests that the chalcopyrite was formed later than pyrrhotite.Combined with geological mapping in the pit,there may have been a large magmatic and mineralization system beneath Dabaoshan area and its periphery and multiple intrusions have occurred.This belongs to the Jurassic mineralization event related to the magmatic hydrothermal origin.
The Dabaoshan copper polymetallic deposit,has increased its copper metal resources about 206000 tons owing to the north stratiform copper orebody found in recent years which is similar to the main stratiform copper-sulfur orebody in the pit.In order to solve the mineralization time issue of this stratiform copper orebody,massive sulfide ore samples were collected from this north copper orebody.Re-Os dating of chalcopyrite and pyrrhotite was carried out to determine the mineralization time and analyze the genesis of copper ore deposit.Re-Os isochron age of chalcopyrite is 243±41 Ma(MSWD=3.1)and isochron age of pyrrhotite is 410±16 Ma(MSWD=15),indicating the formation of chalcopyrite may be later than that of pyrrhotite.But whether there is a mineralization event in the Caledonian should be considered more carefully with more study.The ore mineralogic study of chalcopyrite and pyrrhotite shows that the chalcopyrite had replaced pyrrhotite,which suggests that the chalcopyrite was formed later than pyrrhotite.Combined with geological mapping in the pit,there may have been a large magmatic and mineralization system beneath Dabaoshan area and its periphery and multiple intrusions have occurred.This belongs to the Jurassic mineralization event related to the magmatic hydrothermal origin.
引文
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[21]王广强,刘中华,高小林,等.粤北大宝山斑岩钼钨矿床赋矿岩体锆石LA-ICP-MS U-Pb年龄与矿床形成动力学背景分析[J].地质学报,2014,88(11):2097-2107.
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[26]杜安道,何红蓼,殷宁万,等.辉钼矿的铼-锇同位素地质年龄测定方法研究[J].地质学报,1994,68(4):339-347.
[27]屈文俊,杜安道.高温密闭溶样电感耦合等离子体质谱准确测定辉钼矿铼-锇地质年龄[J].岩矿测试,2003,22(4):254-262.
[28]蔡锦辉,韦昌山,张燕挥,等.广东省大宝山钼多金属矿区岩浆岩成岩时代研究[J].华南地质与矿产,2013,29(2):146-155.
[29]潘会彬,康志强,付文春.粤北大宝山矿区徐屋岩体SHRIMP锆石U-Pb年龄及其地质意义[J].地质通报,2014,33(6):894-899.
[30]杜国民,梅玉萍,蔡红,等.粤北大宝山钼钨多金属矿床年代学研究及其意义[J].华南地质与矿产,2012,28(3):226-231.
[2]黄崇轲,白冶,朱裕生,等.中国铜矿床[M].北京:地质出版社,2001:491-496.
[3]邱世强.关于大宝山层状多金属矿床成因的初步探讨[J].地质论评,1981,27(4):333-340.
[4]姚德贤,曾令初.论大宝山矿床成因[J].南方金属,1996(5):17-21.
[5]刘姤群,杨世义,张秀兰,等.粤北大宝山多金属矿床成因的初步探讨[J].地质学报,1985(1):47-61.
[6]葛朝华,韩发.广东大宝山矿床喷气-沉积成因地质地球化学特征[M].北京:科学技术出版社,1987:1-111.
[7]黄书俊,曾永超,贾国相,等.论广东大宝山多金属矿床的成因[J].地球化学,1987(1):27-35.
[8]杨振强.大宝山块状硫化物矿床成因:泥盆纪海底热事件[J].华南地质与矿产,1997(1):7-17.
[9]王殿宝,梁继官,林雁.大宝山多金属矿铜铅锌矿床成因探讨[J].大宝山科技,2006,1(1):10-13.
[10]伍静,王广强,梁华英,等.粤北大宝山矿区加里东期火山岩的厘定及其地质意义[J].岩石学报,2014,30(4):1145-1154.
[11]杨刚,杜安道,卢记仁,等.金川镍-铜-铂矿床块状硫化物矿石的Re-Os(ICP-MS)定年[J].中国科学:D辑,2005,35(3):241-245.
[12]YING L J,WANG C H,TANG J X,et al.Re-Os systematics of sulfides(chalcopyrite,bornite,pyrite and pyrrhotite)from the Jiama Cu-Mo deposit of Tibet,China[J].Journal of Asian Earth Sciences,2014,79:497-506.
[13]李超,裴浩翔,王登红,等.山东孔辛头铜钼矿成矿时代及物质来源:来自黄铜矿、辉钼矿Re-Os同位素证据[J].地质学报,2016,90(2):240-249.
[14]杜安道,屈文俊,王登红,等.铼锇法及其在矿床学研究中的应用[M].北京:地质出版社,2012:1-182.
[15]WANG L,HU M,YANG Z,et al.U-Pb and Re-Os geochronology and geodynamic setting of the Dabaoshan polymetallic deposit,northern Guangdong Province,South China[J].Ore Geology Reviews,2011,43(1):40-49.
[16]LI C Y,ZHANG H,WANG F Y,et al.The formation of the Dabaoshan porphyry molybdenum deposit induced by slab rollback[J].Lithos,2012,150(5):101-110.
[17]瞿泓滢,陈懋弘,杨富初,等.粤北大宝山铜多金属矿床中层状铜矿体的成矿时代及其成因意义[J].岩石学报,2014,30(1):152-162.
[18]刘莎,王春龙,黄文婷,等.粤北大宝山斑岩钼钨矿床赋矿岩体锆石LA-ICP-MS U-Pb年龄与矿床形成动力学背景分析[J].大地构造与成矿学,2012,36(3):440-449.
[19]王磊,胡明安,屈文俊,等.粤北大宝山多金属矿床LA-ICPMS锆石U-Pb和辉钼矿Re-Os定年及其地质意义[J].中国地质,2012,39(1):29-42.
[20]毛伟,李晓峰,杨富初.广东大宝山多金属矿床花岗岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].岩石学报,2013,29(12):4104-4120.
[21]王广强,刘中华,高小林,等.粤北大宝山斑岩钼钨矿床赋矿岩体锆石LA-ICP-MS U-Pb年龄与矿床形成动力学背景分析[J].地质学报,2014,88(11):2097-2107.
[22]向建华,梁新权,董超阁,等.广东大宝山钨钼多金属矿床的锆石U-Pb、辉钼矿Re-Os年代学及其成矿系统研究[J].吉林大学学报(地球科学版),2015,45(增刊1):1-2.
[23]何国朝,张健,伍静,等.粤北大宝山矿区船肚岩体和大宝山花岗斑岩锆石LA-ICP-MS U-Pb年龄及多阶段成矿分析[J].大地构造与成矿学,2016,40(1):136-144.
[24]徐志刚,陈毓川,王登红,等.中国成矿区带划分方案[M].北京:地质出版社,2008:1-138.
[25]陈毓川,王登红,朱裕生,等.中国成矿体系与区域成矿评价[M].北京:地质出版社,2007:1-1005.
[26]杜安道,何红蓼,殷宁万,等.辉钼矿的铼-锇同位素地质年龄测定方法研究[J].地质学报,1994,68(4):339-347.
[27]屈文俊,杜安道.高温密闭溶样电感耦合等离子体质谱准确测定辉钼矿铼-锇地质年龄[J].岩矿测试,2003,22(4):254-262.
[28]蔡锦辉,韦昌山,张燕挥,等.广东省大宝山钼多金属矿区岩浆岩成岩时代研究[J].华南地质与矿产,2013,29(2):146-155.
[29]潘会彬,康志强,付文春.粤北大宝山矿区徐屋岩体SHRIMP锆石U-Pb年龄及其地质意义[J].地质通报,2014,33(6):894-899.
[30]杜国民,梅玉萍,蔡红,等.粤北大宝山钼钨多金属矿床年代学研究及其意义[J].华南地质与矿产,2012,28(3):226-231.