江西省上饶县金竹坪钼多金属矿床成矿年代学研究
摘要
江西省上饶县金竹坪钼多金属矿区位于北武夷梨子坑(铜钹山)火山岩盆地,该火山岩盆地是北武夷地区火山岩分布区,本区新发现了较大规模的钼多金属矿化。金竹坪矿区位于该火山岩盆地的近中心位置,钼(钨)多金属矿体又主要赋存于隐伏(半隐伏)花岗岩与其上覆火山岩的接触带,矿化与接触带产状一致。文章通过在该接触带的蚀变花岗岩型矿体中采集的5件辉钼矿样品进行铼-锇同位素定年测试,获得了辉钼矿等时线年龄为(135.5±5.7)Ma,其加权平均方差(MSWD)为16,表明成矿作用发生在中生代白垩纪。由于矿体赋存于岩体顶突部位的蚀变花岗岩中,预示成矿为花岗岩侵入的同期或稍后,即钼钨铅锌银成矿与燕山期花岗岩侵入活动密切相关,这对于火山岩内寻找与侵入岩有关的矿产提供了新的思路。
The Jinzhuping molybdenum-polymetallic deposit from Shangrao,Jiangxi province is located in Lizi volcanic basin,which is one of volcanic rock area in the northern Wuyi and in which larger-scale of molybdenum-polymetallic mineralization was found. The Jinzhuping mine is close situated to the center of the Basin and molybdenum-polymetallic ore bodies mainly occurred within contact zone between underlying granite and overlaid volcanic rock,following the shape of the zone. Re-Os isotope dating for molybdenite from the contact zone yield an isochron age of (135.5±5.7) Ma with MSWD=16,which indicates that the mineralization took place at the Cretaceous. The ore body occurred adjacent to the granite,thus it is inferred that mineralization stage is syngenetic or slightly later than emplacement of the granite,suggesting that mineralization of Mo,W,Pb,Zn and Ag was closely related to emplacement of the Yanshan period granites,and providing a new model for prospecting intrusive-related resource inside the volcanic rocks.
The Jinzhuping molybdenum-polymetallic deposit from Shangrao,Jiangxi province is located in Lizi volcanic basin,which is one of volcanic rock area in the northern Wuyi and in which larger-scale of molybdenum-polymetallic mineralization was found. The Jinzhuping mine is close situated to the center of the Basin and molybdenum-polymetallic ore bodies mainly occurred within contact zone between underlying granite and overlaid volcanic rock,following the shape of the zone. Re-Os isotope dating for molybdenite from the contact zone yield an isochron age of (135.5±5.7) Ma with MSWD=16,which indicates that the mineralization took place at the Cretaceous. The ore body occurred adjacent to the granite,thus it is inferred that mineralization stage is syngenetic or slightly later than emplacement of the granite,suggesting that mineralization of Mo,W,Pb,Zn and Ag was closely related to emplacement of the Yanshan period granites,and providing a new model for prospecting intrusive-related resource inside the volcanic rocks.
引文
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[14]张家菁,梅玉萍,王登红,李华芹.赣北香炉山白钨矿床的同位素年代学研究及其地质意义[J].地质学报,2008,82(7):927-931.
[15]中国矿床发现史编委会.中国矿床发现史.江西卷[M].北京:地质出版社,1996:100-102.
[2]王登红,陈毓川,陈郑辉,刘善宝,许建祥,张家菁,曾载淋,陈富文,李华芹,郭春丽.南岭地区矿产资源形势分析和找矿方向研究[J].地质学报,2007,81(7):882-890.
[3]Smoliar M I,Walker R J,Morgan J W.Re-Os ages of groupⅡA,ⅢA,ⅣA andⅥB iron meteorites[J].Science,1996,271:1099-1102.
[4]杜安道,何红蓼,殷宁万,邹晓秋,孙亚莉,孙德忠,陈少珍,屈文俊.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.
[5]Du A,Wu S,Sun D,Wang S,Qu W,Markey R,Stain H,Morgan J,Malinovskiy D.Preparation and certification of Re-Os dating reference materials:Molybdenite HLP and JDC[J].Geostandard and Geoanalytical Research,2004,28(1):41-52.
[6]杜安道,赵敦敏,王淑贤,孙德忠,刘敦一.Carius管溶样和负离子热表面电离质谱准确测定辉钼矿铼-锇同位素地质年龄[J].岩矿测试,2001,20(4):247-252.
[7]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):254-257.
[8]Shirey S B,Walker R J.Carius tube digestion for low-blank rhenium-osmium analysis[J].Analytical Chemistry,1995,67:2136-2141.
[9]许建祥,曾载淋,李雪琴,刘俊生,陈郑辉,刘善宝,郭春丽,王成辉.江西寻乌铜坑嶂钼矿床地质特征及其成矿时代[J].地质学报,2007,81(7):924-928.
[10]梅玉萍,李华芹,王登红,路远发,杨红梅,许建祥,张家菁.江西岩背斑岩锡矿的成岩成矿时代及其地质意义[J].地球学报,2007,28(5):456-461.
[11]王登红,许建祥,张家菁,李水如,许以明,曾载淋,陈郑辉.华南深部找矿有关问题探讨[J].地质学报,2008,82(7):865-872.
[12]余心起,吴淦国,舒良树,颜铁增,张达,狄永军.白垩纪时期赣杭构造带的伸展作用[J].地学前缘,2006,13(3):31-43.
[13]周雪贵,彭发芽,吴俊华.北武夷下汪家铜多金属矿床地质特征及成因分析[J].资源调查与环境,2005,26(1):27-32.
[14]张家菁,梅玉萍,王登红,李华芹.赣北香炉山白钨矿床的同位素年代学研究及其地质意义[J].地质学报,2008,82(7):927-931.
[15]中国矿床发现史编委会.中国矿床发现史.江西卷[M].北京:地质出版社,1996:100-102.
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