内蒙古敖汉旗大黄花正长花岗岩锆石U-Pb年代学及地球化学特征

李斌; 陈井胜; 张建伟; 李伟; 刘淼

doi:10.13686/j.cnki.dzyzy.2016.02.003

内蒙古敖汉旗大黄花正长花岗岩锆石U-Pb年代学及地球化学特征

1.
中国地质调查局沈阳地质调查中心(沈阳地质矿产研究所), 辽宁沈阳 110034;

2.
吉林大学地球科学学院, 吉林长春 130061;

3.
青岛大学环境科学系, 山东青岛 266071

详细信息

作者简介: 李斌(1986-),男,硕士,主要从事火成岩岩石学研究工作,通信地址辽宁省沈阳市皇姑区黄河北大街280号,E-mail//717121767@qq.com

中图分类号: P597;P595

收稿日期: 2015-06-03

修回日期: 2015-07-06

刊出日期: 2016-04-30

ZIRCON U-Pb GEOCHRONOLOGY AND GEOCHEMISTRY OF THE DAHUANGHUA SYENOGRANITE IN AOHAN QI, INNER MONGOLIA

1.
Shenyang Institute of Geology and Mineral resources, CGS, Shenyang 110034, China;

2.
College of Earth Sciences, Jilin University, Changchun 130061, China;

3.
Department of Environmental Science, Qingdao University, Qingdao 266071, Shandong Province, China

Received Date: 03 June 2015

Revised Date: 06 July 2015

Publish Date: 30 April 2016

摘要

摘要: 通过研究大黄花正长花岗岩的锆石U-Pb年代学，结合地球化学特征，探讨其形成时代、岩石成因及其构造背景.大黄花正长花岗岩的同位素测试结果为162.6±1.9 Ma，表明该岩体形成于中侏罗世晚期.该花岗岩主量元素具有高Si、富碱、低P和Ca的特征，微量元素具明显的Eu、Ba、Sr、P、Ti负异常.岩石经历了高分异演化（DI=95.1~95.88），为高分异I型花岗岩.极低的Sr/Yb比值暗示其形成于一个非常低压的熔融环境.结合岩石地球化学、区域地质特征，认为大黄花正长花岗岩是蒙古-鄂霍次克缝合带演化的产物，其形成于碰撞后的伸展环境.
- 正长花岗岩 /
- 锆石U-Pb年代学 /
- 地球化学 /
- 敖汉旗 /
- 内蒙古
Abstract: Based on the study of zircon U-Pb geochronology and geochemistry of the Dahuanghua syenogranite in Aohan Qi, Inner Mongolia, the formation time, petrogenesis and tectonic background are discussed. The result of the zircon U-Pb age by laser ablation ICP-MS technique is 162.6±1.9 Ma, indicating that the Dahuanghua syenogranite is formed in late Middle Jurassic. The major and rare elements are characterized by high Si, rich alkaline and obviously negative Eu, Ba, Sr, P and Ti anomalies. The rock, which experienced a high fractionate evolution(DI=95.1-95.88), is highly fractionated I-type granite. The low Sr/Yb ratio implies that it was formed in a melting environment with very low pressure. Combining the geochemical and regional geological characteristics, it is suggested that the Dahuanghua syenogranite should be generated in postcollisional extension tectonic setting with the evolution of Mongolian-Okhotsk suture zone.
- syenogranite /
- zircon U-Pb age /
- geochemistry /
- Aohan Qi /
- Inner Mongolia

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内蒙古敖汉旗大黄花正长花岗岩锆石U-Pb年代学及地球化学特征

1. 中国地质调查局 沈阳地质调查中心(沈阳地质矿产研究所), 辽宁 沈阳 110034; 2. 吉林大学 地球科学学院, 吉林 长春 130061; 3. 青岛大学 环境科学系, 山东 青岛 266071

作者简介: 李斌(1986-),男,硕士,主要从事火成岩岩石学研究工作,通信地址 辽宁省沈阳市皇姑区黄河北大街280号,E-mail//717121767@qq.com

ZIRCON U-Pb GEOCHRONOLOGY AND GEOCHEMISTRY OF THE DAHUANGHUA SYENOGRANITE IN AOHAN QI, INNER MONGOLIA

1. Shenyang Institute of Geology and Mineral resources, CGS, Shenyang 110034, China; 2. College of Earth Sciences, Jilin University, Changchun 130061, China; 3. Department of Environmental Science, Qingdao University, Qingdao 266071, Shandong Province, China

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1.
中国地质调查局沈阳地质调查中心(沈阳地质矿产研究所), 辽宁沈阳 110034;

2.
吉林大学地球科学学院, 吉林长春 130061;

3.
青岛大学环境科学系, 山东青岛 266071

作者简介: 李斌(1986-),男,硕士,主要从事火成岩岩石学研究工作,通信地址辽宁省沈阳市皇姑区黄河北大街280号,E-mail//717121767@qq.com

1.
Shenyang Institute of Geology and Mineral resources, CGS, Shenyang 110034, China;

2.
College of Earth Sciences, Jilin University, Changchun 130061, China;

3.
Department of Environmental Science, Qingdao University, Qingdao 266071, Shandong Province, China