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| 粤北竹山下岩体锆石U-Pb同位素定年及其地球化学特征 | |
| 引用本文： | 王联社,邓平,朱捌,沈渭洲,谭正中.粤北竹山下岩体锆石U-Pb同位素定年及其地球化学特征[J].铀矿地质,2010,26(5):264-270. |
| 作者姓名： | 王联社 邓平 朱捌 沈渭洲 谭正中 |
| 作者单位： | 1. 核工业290研究所,广东,韶关,512026 2. 中国地质科学院地质研究所,北京,100037 3. 核工业290研究所,广东,韶关,512026;成都理工大学,四川,成都,610059 4. 南京大学地球科学系,江苏,南京,210093 |
| 摘 要： | 竹山下岩体锆石SHRI MP U-Pb年龄为161.0±3.0 Ma,属燕山早期岩浆活动产物。该岩体的主要元素显示富硅(Si O2=76.05%~79.16%)、富碱(K2O+Na2O=7.77%~8.40%)、强过铝质(A/CNK=1.08~1.26)和低CaO/Na2O值(0.04~0.06)等特征。微量元素富集大离子元素而亏损Ba,Sr,Ce和Ti;LREE轻微亏损(LREE/HREE=0.82~1.09),Eu亏损明显(δEu=0.06~0.11),且具有较明显的四分组效应(TE1,3=1.07~1.24)。上述特征表明,竹山下岩体属于典型的壳源型花岗岩,是在地壳伸展-减薄的构造背景下,由泥质变质岩经过低程度部分熔融的方式而形成。 |
| 关 键 词： | SHRIMP U-Pb年龄 地球化学 铀矿床 竹山下岩体 |
U-Pb isotopic dating of zircon and geochemical characteristics of Zhushanxia pluton,northern Guangdong |
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| WANG Lian-she,DENG Ping,ZHU Ba,SHEN Wei-zhou,TAN Zheng-zhong.U-Pb isotopic dating of zircon and geochemical characteristics of Zhushanxia pluton,northern Guangdong[J].Uranium Geology,2010,26(5):264-270. | |
| Authors: | WANG Lian-she DENG Ping ZHU Ba SHEN Wei-zhou TAN Zheng-zhong |
| Institution: | 1.Research Institute No.290,CNNC,Shaoguan,Guangdong 512026,China;2.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;3.Chengdu University of Technology,Chengdu,Sichuan 610059,China;4.Department of Earth Sciences,Nanjing University,Nanjing,Jiangsu 210093,China) |
| Abstract: | U-Pb dating of zircons from Zhushanxia pluton yields an age of 161.0±3.0 Ma,which suggests that this pluton was the products of early Yanshanian magmatism.This pluton is characterized by high silica（SiO2=76.05%～79.16%）and alkali（K2O＋Na2O=7.77%～8.40%）,strongly peraluminous（A/CNK=1.08～1.26）and low CaO/Na2O ratio（0.04～0.06）.It is enriched in large-ion lithophile,and depleted in Ba,Sr,Ce and Ti.This pluton also shows light LREE depletion with LREE/HREE ratios of 0.82～1.09 and（La/Yb）N ratios of 0.37～0.59,and strong negative Eu anomaly with δEu values of 0.06～0.11,and typical tetrad effect.All these features suggest that Zhushanxia pluton is a typical crust-derived granitic pluton.The granitic magma may have been derived from partial melting of Paleoproterozoic-Mesoproterozoic meta-sedimentary rocks in a crustal extension-thinning tectonic environment. |
| Keywords: | zircon U-Pb dating geochemistry uranium deposit Zhushanxia pluton |
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