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引用本文:雷 敏 吴才来 秦海鹏 王 楠 张 昕 陈红杰. 安徽铜陵地区虎山岩体矿物成分特征及其锆石U-Pb年代学[J]. 中国地质, 2015, (5): 1274-1292.
LEI Min, WU Cai-lai, QIN Hai-peng, WANG Nan, ZHANG Xin, CHEN Hong-jie. Mineral composition and zircon U-Pb dating of the Hushan intrusion in Tongling area, Anhui Province[J]. Geology in China, 2015, (5): 1274-1292(in Chinese with English abstract).
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安徽铜陵地区虎山岩体矿物成分特征及其锆石U-Pb年代学
雷 敏 吴才来 秦海鹏 王 楠 张 昕 陈红杰
作者单位
雷 敏 吴才来 秦海鹏 王 楠 张 昕 陈红杰 大陆构造与动力学国家重点实验室中国地质科学院地质研究所北京 100037 
摘要:
提要:铜陵地区虎山岩体主要由石英二长闪长岩和花岗闪长斑岩组成,属高钾钙碱性系列中酸性侵入岩。本文对虎山岩体进行了LA-ICP-MS锆石U-Pb定年,结果表明,虎山石英二长闪长岩和花岗闪长斑岩侵入时代分别为(143.2±1.2)Ma和(145.3±1.2)Ma,属晚侏罗—早白垩世,与中国东部J-K岩浆事件相呼应,并且,虎山岩体存在两次岩浆侵入活动,早期形成的花岗闪长斑岩的年龄为(145.3±1.2)Ma,与铜陵矿集区瑶山花岗闪长斑岩的年龄(146.0±0.9)Ma在误差范围内一致,晚期形成的石英二长闪长岩为(143.2±1.2) Ma,与区内的铜官山和天鹅抱蛋山岩体的年龄(142±1) Ma和(141.7±1) Ma一致。岩石地球化学及矿物温压计计算结果表明,岩浆结晶的温度为768~838°C、压力为3.44×108~5.42×108 Pa,虎山岩体属幔源岩浆和壳源岩浆混合成因,且混合作用发生在11~18 km的浅位岩浆房。
关键词:  花岗岩类  矿物学  LA-ICP-MS锆石U-Pb定年  温压计  铜陵  虎山岩体
DOI:
分类号:
基金项目:国家专项(SinoProbe-05-05),公益性行业科研专项课题(201211095-4)和国家自然科学基金项目(40921001、41302266)以及中国地质调查局项目(1212011120160、1212010918007)共同资助。
Mineral composition and zircon U-Pb dating of the Hushan intrusion in Tongling area, Anhui Province
LEI Min, WU Cai-lai, QIN Hai-peng, WANG Nan, ZHANG Xin, CHEN Hong-jie
Abstract:
Abstract: Mesozoic intermediate-acid intrusive rocks in Hushan intrusion of Tongling area belong to the high potassium (K) calc-alkaline series, with main rock types being quartz monzodiorite and granodiorite porphyry. LA-ICP-MS zircon U-Pb dating of Hushan intrusion shows that the emplacement age of quartz monzodiorite and granodiorite porphyry are (143.2±1.2)Ma and (145.3±1.2)Ma respectively, belonging to Late Jurassic-Early Cretaceous. These data are consistent with eastern China’s J-K magmatic event. In addition, Hushan body has experienced two times of magma intrusion activities. The age of early granodiorite porphyry (145.3±1.2)Ma is consistent with the age of Yaoshan granodiorite porphyry (146.0±0.9) Ma in the Tongling ore district, and the age of late quartz monzodiorite (143.2±1.2)Ma is consistent with that of Tongguanshan and Tianebaodanshan (142±1)Ma,(141.7±1)Ma). From the study of geochemistry and plagioclase-hornblende thermobarometry, the authors conclude that the magma crystallization temperature and the corresponding pressure varied in the range of 768~838°C and 3.44×108 ~5.42×108 Pa, respectively. Hushan intrusion was derived from the mixture of the mantle magma and crustal magma, with their corresponding depths being 11~18 km.
Key words:  granitoids  mineralogy  LA-ICP-MS zircon U-Pb dating  thermobarometry  Tongling  Hushan intrusion