| 浙江安吉多金属矿区石英二长斑岩岩石化学特征和锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 唐燕文,谢玉玲,李应栩,邱立明,刘保顺,李媛,张欣欣,姜研岑,韩宇达,周俊杰.浙江安吉多金属矿区石英二长斑岩岩石化学特征和锆石U-Pb年龄及其地质意义[J].现代地质,2012,26(4):647-655. |
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| 作者姓名： | 唐燕文 谢玉玲 李应栩 邱立明 刘保顺 李媛 张欣欣 姜研岑 韩宇达 周俊杰 |
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| 作者单位： | 北京科技大学土木与环境工程学院,北京,100083 |
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| 基金项目： | 科技部公益性行业基金项目，“十二五”国家科技计划项目 |
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| 摘 要： | 为了解浙江安吉多金属矿区岩浆作用的性质及其与成矿作用的关系,对区内石英二长斑岩的地球化学和年代学展开研究。地球化学结果表明,该岩脉高硅(w(SiO2)=65.91%～66.72%)、富碱(w(K2O+Na2O)=7.82%～8.26%)、高钾(w(K2O)/w(Na2O)=1.58～1.82),铝饱和指数A/CNK=0.86～0.91,轻稀土元素和大离子亲石元素Rb、Th、K相对富集,铕弱负异常,Ba、Sr和高场强元素Nb、Ti、P相对亏损,属准铝质―钾玄岩系列。铝饱和指数及结晶分异指数显示,该岩脉属I型花岗岩系列。年代学结果表明,该岩脉锆石U-Pb年龄为(137.3±1.6)Ma,与区内杂岩体同期。据野外证据,该岩脉的侵位时代指示北东向湖州―学川大断裂在(137.3±1.6)Ma左右再次活动,且该时间也为北西向孝丰―三门湾大断裂再度活跃的最早年龄。区内岩浆作用、成矿作用基本同期,岩体与矿化又具有密切的空间关系,表明区内成矿作用和岩浆活动密切相关。
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| 关 键 词： | 浙西 Pb-Zn多金属矿床 孝丰―三门湾大断裂 湖州―学川大断裂 锆石U-Pb定年 成矿时代 |
Geochemical Characteristics and Zircon LA-ICP-MS U-Pb Ages of Quartz-Monzonite Porphyry in Anji Polymetallic Ore District of Zhejiang and Their Geological Implications |
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| TANG Yan-wen
,
XIE Yu-ling
,
LI Ying-xu
,
QIU Li-ming
,
LIU Bao-shun
,
LI Yuan
,
ZHANG Xin-xin
,
JIANG Yan-cen
,
HAN Yu-da
,
ZHOU Jun-jie.Geochemical Characteristics and Zircon LA-ICP-MS U-Pb Ages of Quartz-Monzonite Porphyry in Anji Polymetallic Ore District of Zhejiang and Their Geological Implications[J].Geoscience——Journal of Graduate School,China University of Geosciences,2012,26(4):647-655. |
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| Authors: | TANG Yan-wen XIE Yu-ling LI Ying-xu QIU Li-ming LIU Bao-shun LI Yuan ZHANG Xin-xin JIANG Yan-cen HAN Yu-da ZHOU Jun-jie |
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| Institution: | (Civil and Environmental Engineering Institute,University of Science and Technology Beijing,Beijing 100083,China) |
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| Abstract: | In order to get further understanding about the magmatism and its relationship with mineralization,the geochemical characteristics and zircon U-Pb age of quartz-monzonite porphyry in Anji polymetallic ore district in western Zhejiang have been studied.Quartz-monzonite porphyry is characterized by high SiO2(65.91%-66.72%),alkali-rich(Na2O+K2O=7.82%-8.26%),potassium-high(K2O/Na2O=1.58-1.82) and A/CNK=0.86-0.91.Based on the results from A/CNK-A/NK and SiO2-K2O diagrams,quartz-monzonite porphyry belongs to the quasi-aluminous rock and shoshonite series.In chondrite normalized REE distribution patterns,all the samples are LREE-enriched and with weak negative anomaly in Eu(δEu=0.75-0.81).In primitive mantle normalized trace elements spider diagram,the large-ion lithophile elements(e.g.Rb,Th and K) are high concentrations,but Ba,Sr and the high field strength elements(e.g.Nb,Ti and P) are relatively depleted.The aluminized indexes(A/CNK) of all the samples are less than 1.1 and all the differentiation indexes(DI) are about 77,so quartz-monzonite porphyry belongs to I-type granite.Zircon U-Pb dating by LA-ICP-MS shows this porphyry emplaced at(137.3±1.6) Ma of Early Cretaceous and has a similar age with the Wushanguan complex.Considering that quartz-monzonite porphyry exists along Huzhou-Xuechuan fault and is cut off by Xiaofeng-Sanmenwan fault,this age indicates that Huzhou-Xuechuan fault was activated in Early Cretaceous and also constrains the earliest time when Xiaofeng-Sanmenwan fault activated.The magmatism formed in the same time with mineralization,and mineralization also has a close relationship with the complex body in space,so it is believed that the mineralization is related to the magmatism in this study area. |
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| Keywords: | western Zhejiang Pb-Zn polymetallic deposit Xiaofeng-Sanmenwan fault Huzhou-Xuechuan fault zircon U-Pb dating metallogenic epoch |
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