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Zircon U-Pb geochronological and Hf isotopic constraints on petrogenesis of Tieshan and Jinshandian plutons in the southeastern Hubei Province
Author(s): QU HongYing 1, 2 , WANG HaoLin1, PEI RongFu1, YAO Lei3, WANG YongLei1 and ZHENG ZhiGang41.MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China 2.State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China 3.School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China 4.Daye Iron Ore, Wuhan Iron and Steel Group Minerals CO., LTP, Huangshi 435006, China
Pages: 147-
165
Year: 2012
Issue:
1
Journal: Acta Petrologica Sinica
Keyword: LA-ICP-MS锆石U-Pb测年; 锆石Hf同位素分析; 矽卡岩型铁矿床; 晚中生代; 鄂东南地区;
Abstract: 长江中下游是中国东部中生代大规模成矿的重要地区之一,是我国东部一个重要的Cu-Fe-Au-Mo多金属成矿区带。本文以鄂东南地区铁山岩体和金山店岩体为研究对像,利用原位LA-ICP-MS锆石U-Pb测年和锆石Hf同位素分析方法,探讨该地区岩体成因以及岩浆作用与成矿作用。铁山石英闪长岩LA-ICP-MS锆石U-Pb年龄加权平均值为138.9±0.96Ma(样品jls1-110)、138.2±0.94Ma(样品jls3)、131.0±1.2Ma(样品jls4)和118.9±1.2Ma(样品jls5),金山店石英闪长岩LA-ICP-MS锆石U-Pb年龄加权平均值为128.6±0.88Ma(样品jsd),为早白垩世、燕山晚期。铁山岩体石英闪长岩εHf(0)为负值,εHf(t)为负值(-17.3707~-8.31555),一阶段Hf模式年龄(tDM1)平均为1.33Ga,二阶段Hf模式年龄(tDM2)平均为2.03Ga;金山店岩体石英闪长岩εHf(0)为负值,εHf(t)为负值(-7.81135~-3.45982),一阶段Hf模式年龄(tDM1)平均为1.03Ga,二阶段Hf模式年龄(tDM2)平均为1.56Ga。铁山和金山店石英闪长岩样品中锆石Hf同位素组成特征显示该地区为岩体形成时有壳源物质参加的这一可能性,为长江中下游壳源岩浆提供补充。在结合已有的岩石学、地球化学以及矿床同位素年龄资料基础上,可以推断出鄂东南地区早白垩世矽卡岩型铁矿床形成于岩石圈伸展-减薄环境。
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