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| 粤北红山岩体形成时代及成因研究 | |
| 引用本文： | 朱捌,邓平,凌洪飞,沈渭洲,谭正中.粤北红山岩体形成时代及成因研究[J].铀矿地质,2009,25(6):321-329. |
| 作者姓名： | 朱捌 邓平 凌洪飞 沈渭洲 谭正中 |
| 作者单位： | 1. 成都理工大学,成都,610059;核工业290研究所,韶关,512026 2. 中国地质科学院地质研究所,北京,100037 3. 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 4. 核工业290研究所,韶关,512026 |
| 基金项目： | 核工业地质局科研项目、地调局工作项目，教育部科学研究重大项目 |
| 摘 要： | 红山岩体位于诸广山岩体南部,岩性为细粒-中细粒黑云母-二云母花岗岩,锆石SHRI MP U-Pb年龄为155±2 Ma,属于燕山早期岩浆活动产物。该岩体主量元素显示其富硅（Si O2=76.08%-77.25%）、富碱（K2O＋Na2O=8.78%-9.43%）、低的ACNK值（0.94-1.07）和CaO/Na2O值（0.10-0.19）等特征。微量元素特征是富集Rb、Th、U,亏损Ba、Sr、P、Ti以及具有高的Rb/Sr值（30.02-930.9）和Rb/Ba值（18.91-231.8）;LREE/HREE值较低（1.99-2.40）,Eu亏损明显（δEu=0.01-0.07）,具有低的∑Nd（t）值（-10.2--12.0）和古老的Nd模式年龄（1777-1923 Ma）。上述特征表明,红山岩体属于S型花岗岩范畴。笔者认为,中生代太平洋板块的俯冲作用,导致粤北地区骑田岭-诸广山断裂带重新复活,红山岩体可能是在此构造背景下由古元古代地壳通过部分熔融方式形成的。 |
| 关 键 词： | 锆石SHRIMP U-Pb年龄 地球化学特征 S型花岗岩 粤北红山岩体 |
Research on the age and origin of Hongshan pluton in north Guangdong |
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| ZHU Ba,DENG Ping,LING Hong-fei,SHEN Wei-zhou,TAN Zheng-zhong.Research on the age and origin of Hongshan pluton in north Guangdong[J].Uranium Geology,2009,25(6):321-329. | |
| Authors: | ZHU Ba DENG Ping LING Hong-fei SHEN Wei-zhou TAN Zheng-zhong |
| Institution: | ZHU Ba , DENG Ping , LING Hong-fei , SHEN Wei-zhou , TAN Zheng-zhong (1. Chengdu University of Technology, Chengdu, Sichuan 610059, China ; 2. Research Institute No. 290, CNNC, Shaoguan, Guangdong 512026, China; 3. Institute of Geology, Chinese Academy of Geological Sciences, BeOing 100037, China; 4. State Key Laboratory of Mineral Deposit Research, Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210093, China) |
| Abstract: | Located in the midwest of south Zhuguangshan composite pluton,Hongshan pluton is constituted by biotite granite and two-micro granite.The SHRIMP U-Pb age of zircons from the pluton is 155±2 Ma,which belongs to Yanshanian.Hongshan pluton is rich in silicon（SiO2=76.08%～77.25%）and alkali（K2O＋Na2O=8.78%～9.43%）,low in ACNK value（0.94～1.07）and CaO/Na2O value（0.10～0.19）.In trace elements,the pluton is rich in Rb,Th,U,depleted in Ba,Sr,P,Ti and has high Rb/Sr（30.02～930.9）,Rb/Ba（18.91～231.8）,has low LREE/HREE value（1.99～2.40）and remarkable Eu depletion（δEu=0.01～0.07）,has low ∑Nd（t）value（-10.2～-12.0）and old Nd model age（1777～1923 Ma）.All the evidence indicate that it have the characteristic of S type granite.Hongshan pluton is believed to be formed by partial melting of protozoic rocks,which related to the reactivation of Qitianling-Zhuguangshan（east-west）fracture zones resulted from the subduction of Pacific plate. |
| Keywords: | SHRIMP U-Pb age of zircon geochemical characteristics S type granite Hongshan pluton in north Guangdong |
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