| 豫西熊耳山斑竹寺花岗斑岩岩体锆石U-Pb定年及地质意义 |
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| 引用本文： | 梁涛,白凤军,罗照华,卢欣祥,卢仁,徐石头,成静亮.豫西熊耳山斑竹寺花岗斑岩岩体锆石U-Pb定年及地质意义[J].西北地质,2014(2):41-50. |
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| 作者姓名： | 梁涛 白凤军 罗照华 卢欣祥 卢仁 徐石头 成静亮 |
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| 作者单位： | 河南省有色金属地质勘查总院;河南省有色金属深部找矿勘查技术研究重点实验室;中国地质大学;河南省国土资源科学研究院; |
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| 基金项目： | 河南省国土资源厅科技攻关项目(2011-622-36和2011-622-25);河南省有色金属地质矿产局科研项目(YS-DK2012-03和YSDK2013-08) |
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| 摘 要： | 豫西熊耳山内121个内生金属矿床(点)分布于经线112°E以西,而其内经线112°E以东尚未发现内生金属矿化,它是否为熊耳山内生金属成矿作用的界线对该地区的找矿思路转变具有重要意义。笔者对熊耳山地区经线112°E以东出露面积最大的斑竹寺花岗斑岩岩体进行了LA-ICP-MS锆石U-Pb定年,样品BZS01的29个锆石测点的测定值均位于207Pb/235 U-206Pb/238 U一致线上,其206 Pb/238 U年龄为124~138Ma,28个测点的加权平均206Pb/238 U年龄为129±1Ma(MSWD=1.7),属于早白垩世。斑竹寺岩体是岩石圈拆沉作用的产物,其形成时代位于东秦岭地区广泛而强烈的成岩成矿作用时限内,且斑竹寺岩体显示了Au、Ag、Pb、Zn等成矿元素的异常富集,这表明熊耳山内经线112°E以东的斑竹寺岩体具有成矿潜力。
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| 关 键 词： | 斑竹寺 花岗斑岩 锆石U-Pb定年 成矿潜力 熊耳山 |
LA-ICP-MS Zircon U-Pb Dating and Its Geological Implications of Banzhusi Granitic Porphyry in Xiongershan of Western Henan Province |
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| Institution: | LIANG Tao, BAI Feng-jun, LUO Zhao-hua, LU Xin-xiang, LU Ren, XU Shi-tou, CHENG Jing-liang (1. General Institute of Non-ferrous Metals Geologic Exploration, Zhengzhou 450052, China ; 2. Key Laboratory of Deep Ore-prospecting Technology Research for Non-ferrous Metals of Henan Province, Zhengzhou 450052, China; 3. China University of Geosciences, Beijing 100083, China; 4. Institute of Land and Resources of Henan Province, Zhengzhou 450053, China) |
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| Abstract: | There are 121endogenetic metal deposits and mineralizaion spots found in Xiongershan of western Henan province,which are distributed in the west of 112°E.On the east side of this longitude,however,no endogenetic metal mineralization has been found until now.So the longitude may have a great significance to the ore prospecting direction in this area.LA-ICP-MS zircon U-Pb dating is conducted on Banzhusi granitic porphyry,whose outcrop proportion takes up most of the area eastern of longitude 112.Values of 29zircon measuring points from sample BZS01are analyzed in total,and all of them are in concordance in the 207Pb/235 U-206 Pb/238 U diagram,whose 206Pb/238 U ages change between 124Ma and 138Ma.The weighted average age of28analyzed spots is 129±1Ma,suggesting that the ore body was formed in early Cretaceous.The research also indicates that Banzhusi rock mass is the product of lithosphere delamination,and its age falls into the time interval of extensive and intensive endogenetic mineralization in east Qinling orogenic belt.Samples from Banzhusi ore body have displayed abnormal enrichment in Au,Ag,Pb and Zn,from which it can be considered that Banzhusi ore body possesses endogenetic mineralization potential. |
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| Keywords: | Banzhusi granitic porphyry zircon U-Pb dating mineralization potential Xiongers-han |
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