铜陵地区朝山矽卡岩型金矿床及含矿岩体的成因:40 Ar/39 Ar年龄、元素地球化学及多元同位素证据

王建中,李建威,赵新福,钱壮志,马昌前. 铜陵地区朝山矽卡岩型金矿床及含矿岩体的成因:40 Ar/39 Ar年龄、元素地球化学及多元同位素证据[J]. 岩石学报, 2008, 24(8).
引用本文: 王建中,李建威,赵新福,钱壮志,马昌前. 铜陵地区朝山矽卡岩型金矿床及含矿岩体的成因:40 Ar/39 Ar年龄、元素地球化学及多元同位素证据[J]. 岩石学报, 2008, 24(8).
WANG JianZhong,LI JianWei,ZHAO XinFu,QIAN ZhuangZhi,MA ChangQian. Genesis of the Chaoshan gold deposit and its host intrusion, Tongling area: Constraints from 40Ar/39Ar ages and elemental and Sr-Nd-O-C-S isotope geochemistry[J]. Acta Petrologica Sinica, 2008, 24(8).
Citation: WANG JianZhong,LI JianWei,ZHAO XinFu,QIAN ZhuangZhi,MA ChangQian. Genesis of the Chaoshan gold deposit and its host intrusion, Tongling area: Constraints from 40Ar/39Ar ages and elemental and Sr-Nd-O-C-S isotope geochemistry[J]. Acta Petrologica Sinica, 2008, 24(8).

铜陵地区朝山矽卡岩型金矿床及含矿岩体的成因:40 Ar/39 Ar年龄、元素地球化学及多元同位素证据

  • 基金项目:

    国家自然科学基金,科技部国际科技合作项目,国家自然科学基金

Genesis of the Chaoshan gold deposit and its host intrusion, Tongling area: Constraints from 40Ar/39Ar ages and elemental and Sr-Nd-O-C-S isotope geochemistry

  • 位于铜陵地区狮子山矿田的朝山金矿是长江中下游成矿带少有的矽卡岩型独立金矿床,成矿与白芒山辉石闪长岩有关,绝大多数金矿体产于白芒山辉石闪长岩与中三叠统南陵湖组灰岩的接触带上.辉石闪长岩中三个角闪石单矿物样品的40Ar/39Ar激光阶段加热分析给出了很好的坪年龄,年龄值介于139.7±0.3~138.3±0.6Ma(2σ),代表白芒山岩体冷却到500~550℃(氩同位素在角闪石中的封闭温度)的年龄.根据角闪石40Ar/39Ar年龄和前人获得的SHRIMP锆石U-Pb年龄(142.9Ma)以及Ar同位素和U-Pb体系在角闪石和锆石中的封闭温度,计算出白芒山岩体冷却速率大约为100℃/Ma.由于氢同位素在角闪石中的封闭温度与朝山金矿的成矿温度非常接近,因此,上述40Ar/39Ar年龄可以代表朝山金矿的成矿年龄.白芒山辉石闪长岩具有富碱、高钠、准铝质、富集轻稀土元素和大离子亲石元素、亏损重稀土元素和高场强元素的地球化学特点,其Sr-Nd同位素组成((87Sr/86Sr)I=0.706598~0.707460,εNd(t)=-7.78~-8.12)与铜陵及邻区同时代或稍晚时候的辉长岩和玄武岩非常相似.以上地球化学和Sr-Nd同位素特征暗示白芒山辉石闪长岩起源于富集岩石圈地幔的部分熔融,并经历了一定程度的分离结晶和地壳混染作用.矿石矿物的硫同位素组成(δ34S= 6.2‰~ 9.3‰)呈偏离零值的塔式分布,富集34S,可能是岩浆硫与中石炭统和/或中三叠统膏盐层混合的产物.矿石中脉石矿物方解石的C-O同位素与矿区三叠系海相碳酸盐明显不同,而与地幔原始碳酸岩相似,反映成矿流体中碳(主要是CO2的形式)的来源以深源为主,与含矿岩体成因研究得出的认识一致.对区域成岩成矿年代学及岩浆活动与成矿作用特点的分析认为,朝山金矿形成于岩石圈伸展的构造背景;强烈的岩石圈伸展及玄武质岩浆底侵为铜陵矿地区大规模岩浆活动及成矿作用提供了必要的动力学环境,也为成矿作用带来了丰富的热能、流体及金属成矿元素.
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