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| 鄂东南地区与铁山和金山店铁矿有关的花岗质岩体锆石LA-ICP-MS年龄和Hf同位素组成及其地质意义 | |
| 引用本文： | 瞿泓滢,王浩琳,裴荣富,姚磊,王永磊,郑志刚.鄂东南地区与铁山和金山店铁矿有关的花岗质岩体锆石LA-ICP-MS年龄和Hf同位素组成及其地质意义[J].岩石学报,2012,28(1):147-165. |
| 作者姓名： | 瞿泓滢 王浩琳 裴荣富 姚磊 王永磊 郑志刚 |
| 作者单位： | 1. 中国地质科学院矿产资源研究所,国士资源部成矿作用与资源评价重点实验室,北京100037;南京大学内生金属矿床成矿机制研究国家重点实验室,南京210093 2. 中国地质科学院矿产资源研究所,国士资源部成矿作用与资源评价重点实验室,北京100037 3. 中国地质大学地球科学与资源学院,北京,100083 4. 武钢矿业公司大冶铁矿,黄石,435006 |
| 基金项目： | 本文受受科学技术部973课题(2012CB416802)、国土资源部公益性行业课题(200911007-18)和南京大学内生金属矿床成矿机制研究国家重点实验室基金项目(15-09-01)联合资助. |
| 摘 要： | 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。 |
| 关 键 词： | 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 |
| 收稿时间： | 2011/8/15 0:00:00 |
| 修稿时间： | 2011/11/20 0:00:00 |
Zircon U-Pb geochronological and Hf isotopic constraints on petrogenesis of Tieshan and Jinshandian plutons in the southeastern Hubei Province |
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| QU HongYing,WANG HaoLin,PEI RongFu,YAO Lei,WANG YongLei and ZHENG ZhiGang.Zircon U-Pb geochronological and Hf isotopic constraints on petrogenesis of Tieshan and Jinshandian plutons in the southeastern Hubei Province[J].Acta Petrologica Sinica,2012,28(1):147-165. | |
| Authors: | QU HongYing WANG HaoLin PEI RongFu YAO Lei WANG YongLei and ZHENG ZhiGang |
| Institution: | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Daye Iron Ore, Wuhan Iron and Steel Group Minerals CO., LTP, Huangshi 435006, China |
| Abstract: | During the Late Mesozoic,extensive magmatism and associated ore deposits were developed in the Middle-Lower Yangtze River metallogenic belt,East China.As the Tieshan and Jinshandian quartz diorite in the southeastern Hubei Province examples,we performed in situ zircon U-Pb dating and Hf isotopic analyses on 5 samples.Twenty-six zircons in the quartz diorite from the Tieshan sample jls1-110 yield excellent concordant results with a weighted mean 206 Pb/ 238 U age of 138.9±0.96Ma(n=26,MSWD=0.82). Zircons from Tieshan sample jls3 yield excellent concordant results with a weighted mean 206 Pb/ 238 U age of 138.2±0.94Ma(n=24, MSWD=0.85).Zircons from Tieshan sample jls4 yield excellent concordant results with a weighted mean 206 Pb/238 U age of 131.0± 1.2Ma(n=11,MSWD=0.94).Zircons from Tieshan sample jls5 yield excellent concordant results with a weighted mean 206 Pb/238 U age of 118.9±1.2Ma(n=14,MSWD=1.20).Zircons from Jinshandian sample jsd yield excellent concordant results with a weighted mean2 06Pb/ 238 U age of 128.6±0.88Ma(n=22,MSWD=0.98).ε Hf (0)andε Hf (t)values of the Tieshan quartz diorite are minus.Hf model age of the first stage(t DM1 )is 1.33Ga and the age of the second stage(t DM2 )is 2.03Ga.ε Hf (0)andε Hf (t) values of the Jinshandina quartz diorite are minus.Hf model age of the first stage(t DM1 )is 1.03Ga and the age of the second stage (t DM2 )is 1.56Ga.Hf isotopic compositions from the Tieshan and Jinshandian quartz diorites show that maybe the curst-derived materials joined in the rock body forming supplement for the crust-derived magma of the Middle-Lower Yangtze River.Based on the datum of petrology,geochemistry and ore isotope ages,we can infer that the skarn type iron deposits of the Early Cretaceous in the southeastern Hubei Province formed on the environment of lithospheric extending and thinning. |
| Keywords: | Zircon U-Pb dating Hf isotopes Skarn type iron deposit Late Mesozoic southeastern Hubei Province |
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