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引用本文:陕 亮1,2 许荣科3 郑有业1,3 张雨莲4 曹 亮5 庞迎春5. 北山地区白山堂铜多金属矿区岩浆岩锆石LA-ICP-MS U-Pb年代学及其地质意义[J]. 中国地质, 2013, 40(5): 1600-1611.
SHAN Liang1,2, XU Rong-ke3, ZHENG You-ye1,3, ZHANG Yu-lian4, CAO Liang5, PANG Ying-chun5. Zircon LA-ICP-MS U-Pb chronology of magmatic rock in the Baishantang copper polymetallic deposit of Beishan area, Northwest China[J]. Geology in China, 2013, 40(5): 1600-1611(in Chinese with English abstract).
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北山地区白山堂铜多金属矿区岩浆岩锆石LA-ICP-MS U-Pb年代学及其地质意义
陕 亮1,2 许荣科3 郑有业1,3 张雨莲4 曹 亮5 庞迎春5
作者单位
陕 亮1,2 许荣科3 郑有业1,3 张雨莲4 曹 亮5 庞迎春5 1. 中国地质大学(北京)地球科学与资源学院北京 1000832. 中国地质调查局发展研究中心北京 1000373. 中国地质大学(武汉)地质调查研究院湖北 武汉 4300744. 中国地质调查局西安地质调查中心陕西 西安 7100545. 中国地质调查局武汉地质调查中心湖北 武汉 430223 
摘要:
提要:北山地区是中国重要成矿区带之一。白山堂铜多金属矿是北山地区最重要的斑岩铜矿之一。本文采用锆石LA-ICP-MS U-Pb定年法测定了白山堂矿区I矿带两类含矿斑岩的同位素年龄。获得的花岗斑岩锆石加权平均年龄(275.0±3.0)Ma(MSWD=1.17),代表了花岗斑岩的结晶年龄(早二叠世)。在流纹斑岩中获得两组年龄,一组系结晶较好的岩浆锆石,加权平均年龄为(371.1±2.8)Ma(MSWD=1.7),表明流纹斑岩的结晶年龄为晚泥盆世;另一组锆石为继承锆石,晶形明显磨圆或包裹于第一组岩浆锆石中,年龄分别为(2627±35)Ma, (2598±35)Ma, (1705±44)Ma, (1722±48)Ma, (1642±51)Ma, (1213±54)Ma,大致分为26亿年、17亿年、12亿年左右的3类。结合地球化学特点,确定流纹斑岩可能与中上地壳在泥盆纪的重熔有关。
关键词:  白山堂  斑岩铜矿  锆石 LA-ICP-MS  北山
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基金项目:中国地质调查局新一轮国土资源大调查项目“西部重要成矿带选区研究”(1212010531504)资助。
Zircon LA-ICP-MS U-Pb chronology of magmatic rock in the Baishantang copper polymetallic deposit of Beishan area, Northwest China
SHAN Liang1,2, XU Rong-ke3, ZHENG You-ye1,3, ZHANG Yu-lian4, CAO Liang5, PANG Ying-chun5
Abstract:
Abstract:Beishan area is an important metallogenic belt, and the Baishantang Cu polymetallic deposit is one of the representative porphyry copper deposits. Two kinds of magmatic rocks along ore belt I in the Baishantang ore district were dated by the zircon LA-ICP-MS U-Pb method, which yielded a porphyry granite diagenetic age of (275.0±3.0)Ma (MSWD =1.17) , indicating early Permian. Two groups of ages were obtained for rhyolite porphyry: a magma zircon group of the rhyolite porphyry has an age of (371.1±2.8)Ma (MSWD=1.7) , suggesting late Devonian. The other inheritance zircon group of inheritance zircon with remarkable rounded shape or enveloped in the former group has ages of (2627±35)Ma, (2598±35)Ma, (705±44)Ma, (1722±48)Ma, (1642±51)Ma, (1213±54)Ma, which can be assigned roughly to 2.6 billion years, 1.7 billion years and 1.2 billion years, indicating that the rhyolite porphyry was related to the remelting of the upper-middle crust in late Devonian, as also shown by the geochemical characteristics.
Key words:  Baishantang  porphyry copper deposit  zircon LA-ICP-MS  Beishan