庐枞盆地砖桥地区科学深钻岩浆岩LA-MC-ICP MS锆石U-Pb年代学和岩石地球化学特征

贾丽琼; 徐文艺; 吕庆田; 莫宣学; 熊欣; 李骏; 王梁

庐枞盆地砖桥地区科学深钻岩浆岩LA-MC-ICP MS锆石U-Pb年代学和岩石地球化学特征

- 1.
  中国地质大学地球科学与资源学院, 北京 100083;中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083;中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037
- 2.
  中国地质科学院矿产资源研究所, 国土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;中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083
- 4.
  中国地质大学地球科学与资源学院, 北京 100083;中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037
- 5.
  中国地质大学地球科学与资源学院, 北京 100083;武警黄金地质研究所, 廊坊 065000
基金项目:
本文受国家“深部探测技术与实验研究”专项课题（SinoProbe-03-06）和“十二五”国家科技支撑计划（2011BAB04B03）联合资助.

收稿日期: 2013-10-20

修回日期: 2014-02-05

刊出日期: 2014-04-30

LA-MC-ICP MS zircon U-Pb geochronology and petrological geochemistry of scientific deep drilling in Zhuanqiao, Lujiang-Zongyang volcanic basin

- 1.
  School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
- 2.
  MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
- 3.
  School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083
- 4.
  School of 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
- 5.
  School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Gold Geology Institute of Chinese Armed Police Force, Langfang 065000, China

Received Date: 20 October 2013

Revised Date: 05 February 2014

Publish Date: 30 April 2014

摘要

摘要: 本文对庐枞盆地砖桥地区科学深钻ZK01中的粗安岩、正长岩和黑云母二长岩进行了LA-MC-ICP MS锆石U-Pb定年，年龄分别是131.29±0.85Ma，130.95±0.56Ma，130.88±0.41Ma。全岩主、微量元素分析结果表明ZK01中的火成岩富钾（K2O平均为3.7%）、富碱（K2O+Na2O平均为8.4%），富集强不相容元素和轻稀土元素，亏损高场强元素和重稀土元素，均属于准铝质-过铝质岩石。在SiO2-K2O图解中，绝大多数样品点落在含钾较高的钾玄岩区域中，火山岩和侵入岩均属于橄榄玄粗岩系。岩浆演化过程中有矿物的分离结晶作用。粗安岩、正长岩和黑云母二长岩的锆石εHf（t）值分别为-12.9~-7.6，-10.1~-6.5，-11.1~-3.4。推测ZK01中的岩浆岩主要来源于俯冲板片流体交代形成的富集地幔，稍有陆壳物质的混染，岩浆形成于岩石圈拉张伸展的构造背景之下。
- SinoProbe /
- 科学深钻 /
- 橄榄玄粗岩系 /
- 砖桥地区 /
- 庐枞盆地
Abstract: LA-MC-ICP MS zircon U-Pb datings yield the ages of 131.29±0.85Ma, 130.95±0.56Ma, 130.88±0.41Ma for trachyandesite, syenite and biotite monzonite from scientific deep drilling ZK01 in Zhuanqiao, Lujiang-Zongyang volcanic basin. Major and trace elements suggest, belonging to metaluminous-peraluminous series, these igneous rocks in ZK01 are characterized by high content of potassium(K2O averaged at 3.7%),rich alkali(K2O+Na2O averaged at 8.4%) and LREEs but depleted strong incompatible elements. Most samples plot in the field of shoshonite in SiO2-K2O diagram, indicating the volcanic and intrusive rocks are shoshonite series. Mineral fractional crystallization occured during the evolution of magma. εHf(t) values of trachyandesite, syenite and biotite monzonite are -12.9~-7.6, -10.1~-6.5 and -11.1~-3.4, respectively. It has been inferred that igneous rocks in ZK01 derived from enriched mantle produced by fluid metasomatism of subduction slab, less contaminated by continental material, and magma formed in the tectonic setting of lithosphere tension.
- SinoProbe /
- Science deep drilling /
- Shoshonite series /
- Zhuanqiao /
- Lujiang-Zongyang volcanic basin

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庐枞盆地砖桥地区科学深钻岩浆岩LA-MC-ICP MS锆石U-Pb年代学和岩石地球化学特征

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