辽东青城子矿田煌斑岩锆石U-Pb年龄及其地质意义

doi:10.12068/j.issn.1005-3026.2016.07.030

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (7): 1056-1060.DOI: 10.12068/j.issn.1005-3026.2016.07.030

辽东青城子矿田煌斑岩锆石U-Pb年龄及其地质意义

张朋¹，赵岩²，寇林林²，杨宏智²

(1. 吉林大学地球科学学院，吉林长春130061； 2. 沈阳地质矿产研究所，辽宁沈阳110034)

收稿日期:2015-01-12 修回日期:2015-01-12 出版日期:2016-07-15 发布日期:2016-07-13
通讯作者: 张朋
作者简介:张朋(1983-)，男，辽宁盘锦人，吉林大学博士研究生.
基金资助:
国家自然科学基金青年基金资助项目(41502093)；中国地质调查局项目(12120113058700).

Zircon U-Pb Dating and Its Geological Significance of Lamprophyres from Qingchengzi Orefield，Liaodong

ZHANG Peng¹， ZHAO Yan²， KOU Lin-lin²， YANG Hong-zhi²

1. College of Earth Sciences， Jilin University， Changchun 130061， China； 2. Shenyang Institute of Geology and Mineral Resources， Shenyang 110034， China.

Received:2015-01-12 Revised:2015-01-12 Online:2016-07-15 Published:2016-07-13
Contact: ZHANG Peng
About author:-
Supported by:
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摘要/Abstract

摘要： 为了深入了解辽东青城子矿集区煌斑岩岩石成因、形成的大地构造环境和地质意义，通过单颗粒锆石LA-ICP-MS U-Pb定年系统和X射线荧光光谱仪，对青城子矿集区煌斑岩进行锆石U-Pb年代学和主量元素地球化学方面研究.结果表明，煌斑岩具有低硅、富镁铁的特点，煌斑岩侵位年龄为(226.0±1.0)Ma～(227.7±1.3)Ma，属于晚三叠世岩浆活动的产物.结合区域构造背景和前人研究，推测煌斑岩是扬子克拉通-华北克拉通深俯冲过程的板片断离的产物，扬子克拉通的深俯冲和陆-陆碰撞可能是华北克拉通东部在中生代破坏的主要原因.

关键词: 煌斑岩, 年代学, 晚三叠世, 青城子, 辽东

Abstract: To better understand the petrogenesis， tectonic environment， and geological significance of the lamprophyres in Qingchengzi， Liaodong. Zircon U-Pb dating and major elements were studied by LA-ICP-MS U-Pb and X-ray fluorescence spectrometers. Results show that characteristics of the lamprophyres have low silicon and high ferrum and magnesium. Zircon LA-ICP-MS U-Pb dating yields ages of (226.0±1.0)Ma～(227.7±1.3)Ma， which indicate lamprophyres are the product of late Indosinian magmatism in North China Craton(NCC). Combined with regional tectonic evolution， results indicate that the lamprophyreas originated from slab break-off during the process of Yangtze Craton and North China Craton continental deep subduction. The deep subduction of Yangtze continental crust and continent-continent collision could be the main reason for the late Mesozoic decratonization of the North China Craton.

Key words: lamprophyres, geochronology, late Triassic, Qingchengzi, Liaodong

中图分类号:

P588
P588.13

张朋，赵岩，寇林林，杨宏智. 辽东青城子矿田煌斑岩锆石U-Pb年龄及其地质意义[J]. 东北大学学报:自然科学版, 2016, 37(7): 1056-1060.

ZHANG Peng， ZHAO Yan， KOU Lin-lin， YANG Hong-zhi. Zircon U-Pb Dating and Its Geological Significance of Lamprophyres from Qingchengzi Orefield，Liaodong[J]. Journal of Northeastern University Natural Science, 2016, 37(7): 1056-1060.

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辽东青城子矿田煌斑岩锆石U-Pb年龄及其地质意义

Zircon U-Pb Dating and Its Geological Significance of Lamprophyres from Qingchengzi Orefield，Liaodong

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