皖南宁国竹溪岭钨银矿床及相关岩体的同位素地质年龄
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摘要
皖南宁国竹溪岭钨银矿床是近年来发现的一个与花岗岩类有关的矽卡岩型矿床,准确厘定其成矿年龄及相关侵入岩体的年龄有利于深入认识区域岩浆作用与成矿作用的规律。本文在矿床地质调查的基础上,应用现代同位素定年技术开展地质年代学研究,获得矿床矿石中的辉钼矿Re-Os模式年龄为142.7±2.1 Ma和142.9±2.1 Ma,相关侵入岩体花岗闪长岩、花岗斑岩和花岗闪长斑岩的LA-ICP-MS锆石U-Pb年龄分别为139.8±1.8 Ma、143.3±1.9 Ma、140.2±1.7 Ma,显示矿床的成矿年龄与侵入岩体的成岩年龄基本一致,为燕山晚期早白垩世。矿床矿石中的辉钼矿的Re含量指示成矿物质来源于地壳和地幔的混合;与成矿相关侵入岩的稀土元素和Hf同位素组成特征指示成岩物质也具有壳幔混源特征,显示成矿物质来源与成岩物质来源具有一致性。区域岩浆岩和矿床的对比表明,与之相邻的长江中下游地区、浙西地区和赣东北地区乃至整个华南地区这一时期发生了大规模的岩浆作用和钨锡多金属成矿作用,显示扬子板块在此阶段处于岩浆–成矿大爆发时期,皖南地区的成矿时代对应于华南中生代三次大规模岩浆作用和成矿作用的第二阶段。
The Zhuxiling W-Ag ore deposit is a newly discovered skarn-type deposit situated in Ningguo city of the southern Anhui province. To constrain the ages of the ore mineralization and related plutons, an integrated geochronological investigation has been carried out on the basis of ore geology survey. Analyses of two molybdenite separates yielded Re-Os model ages of 142.7±2.1 Ma and 142.9±2.1 Ma, respectively; whereas zircons from the granodiorite, granodiorite porphyry, and granite porphyry were dated to be of 139.8±1.8 Ma, 140.2±1.7 Ma, and 143.3±1.9 Ma, respectively, by LA-ICP-MS U-Pb method. The ages of the ores and related granitic rocks are identical within analytical error, suggesting they all formed in the Early Cretaceous. The high rhenium contents(39.7×10-6 to 41.9×10-6) of molybdenite may imply a mixed source of crust and mantle, which is also supported by REE characteristics and Hf isotopic compositions of the related granitic rocks. A comprehensive compile of the ore deposits and magmatic rocks in this and adjacent regions suggests that the whole South China experienced large-scale magmatism and polymetallic W-Sn mineralization in the late Yanshanian, which constitutes a booming period of magmatism and ore mineralization in the Yangtze Plate. This metallogenetic epoch of the southern Anhui province is corresponding to the second stage of the Mesozoic large-scale magmatism and mineralization in South China.
The Zhuxiling W-Ag ore deposit is a newly discovered skarn-type deposit situated in Ningguo city of the southern Anhui province. To constrain the ages of the ore mineralization and related plutons, an integrated geochronological investigation has been carried out on the basis of ore geology survey. Analyses of two molybdenite separates yielded Re-Os model ages of 142.7±2.1 Ma and 142.9±2.1 Ma, respectively; whereas zircons from the granodiorite, granodiorite porphyry, and granite porphyry were dated to be of 139.8±1.8 Ma, 140.2±1.7 Ma, and 143.3±1.9 Ma, respectively, by LA-ICP-MS U-Pb method. The ages of the ores and related granitic rocks are identical within analytical error, suggesting they all formed in the Early Cretaceous. The high rhenium contents(39.7×10-6 to 41.9×10-6) of molybdenite may imply a mixed source of crust and mantle, which is also supported by REE characteristics and Hf isotopic compositions of the related granitic rocks. A comprehensive compile of the ore deposits and magmatic rocks in this and adjacent regions suggests that the whole South China experienced large-scale magmatism and polymetallic W-Sn mineralization in the late Yanshanian, which constitutes a booming period of magmatism and ore mineralization in the Yangtze Plate. This metallogenetic epoch of the southern Anhui province is corresponding to the second stage of the Mesozoic large-scale magmatism and mineralization in South China.
引文
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华仁民,陈培荣,陆建军,张文兰.2005.论华南地区中生代3次大规模成矿作用.矿床地质,24(2):99-107.
李斌,张赞赞,吴明安.周涛发.赵文广,蔡晓兵,狄勤松.2015.皖南宁国大坞尖钨钼矿床成岩成矿年龄--以花岗闪长斑岩锆石U-Pb和辉钼矿Re-Os年龄为依据.地质通报,34(2-3):569-578.
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秦燕,王登红,李延河,王克友,吴礼彬,梅玉萍.2010b.安徽青阳百丈岩钨钼矿床成岩成矿年龄测试及地质意义.地学前缘,17(2):170-177.
秦燕,王登红,吴礼彬,王克友,梅玉萍.2010a.安徽东源钨矿含矿斑岩中的锆石SHRIMP U-Pb年龄及其地质意义.地质学报,84(4):479-484.
邱骏挺,余心起,张德会,代堰培,李弘珂,陈帅奇.2011.浙西北开化桐村花岗斑岩LA-ICPMS锆石U-Pb年代学及其地质意义.地质通报,30(9):1360-1368.
屈文俊,杜安道.2003.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.岩矿测试,22(4):254-262.
唐永成,曹静平,支利庚.2010.皖东南区域地质矿产评价.北京:地质出版社:1-223.
汪建国,汪隆武,陈小友,赵旭东,姜禹,周宗尧,余国春,俞云文.2010.浙西开岭脚和里陈家花岗闪长岩锆石SHRIMP U-Pb年龄及其地质意义.中国地质,37(9):1559-1565.
王德恩,周翔,余心起,杜玉雕,杨郝鸣,傅建真,董会明.2011.皖南祁门地区东源钨钼矿区花岗闪长斑岩SHRIMP锆石U-Pb年龄和Hf同位素特征.地质通报,30(10):1514-1529.
王强,赵振华,简平,许继峰,包志伟,马金龙.2004.德兴花岗闪长斑岩SHRIMP锆石U-Pb年代学和Nd-Sr同位素地球化学.岩石学报,20(2):315-324.
吴元保,郑永飞.2004.锆石成因矿物学研究及其对U-Pb年龄解释的制约.科学通报,49(16):1589-1595.
肖庆辉,刘勇,冯艳芳,邱瑞照,张昱.2010.中国东部中生代岩石圈演化与太平洋板块俯冲消减关系的讨论.中国地质,37(4):1092-1101.
薛怀民,汪应庚,马芳,汪诚,王德恩,左延龙.2009.皖南太平-黄山复合岩体的SHRIMP年代学:由钙碱性向碱性转变对扬子克拉通东南部中生代岩石圈减薄时间的约束.中国科学(D辑):地球科学,39(7):979-993.
杨昔林,曹殿华,李以科,黄玉凤,阚迎松,刘盛祥.2011.江西德兴孔家?银山火山盆地的时代归属:锆石U-Pb年代学证据.中国地质,38(1):86-93.
余心起.1993.皖南中生代构造运动新认识.火山地质与矿产,14(1):61-70.
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