黑龙江省鸡西盆地基性岩40Ar/39Ar同位素定年及其地质意义

黑龙江省鸡西盆地基性岩⁴⁰Ar/³⁹Ar同位素定年及其地质意义

朱占平¹，刘立¹，马瑞¹，邱增凯²,马胜晖¹

1.吉林大学地球科学学院，长春 130061;2.吉林大学仪器科学与电气工程学院，长春 130061

收稿日期:2008-08-15 修回日期:1900-01-01 出版日期:2009-03-26 发布日期:2009-03-26
通讯作者: 朱占平

⁴⁰Ar/³⁹Ar Isotopic Dating and Geological Significance of Mafic Rocks from the Jixi Basin, Heilongjiang Province

ZHU Zhan-ping¹， LIU Li¹，MA Rui¹，QIU Zeng-kai²，MA Sheng-hui¹

1.College of Earth Sciences, Jilin University, Changchun 130061，China;2.College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061，China

Received:2008-08-15 Revised:1900-01-01 Online:2009-03-26 Published:2009-03-26
Contact: ZHU Zhan-ping

摘要/Abstract

摘要： 黑龙江省鸡西盆地张新地区辉绿玢岩呈岩床状侵入晚中生代城子河组地层中；辉绿玢岩较纯净，无捕虏体，呈斑状结构，斑晶由普通辉石、斜长石组成，斑晶体积分数为35%～40%;基质由微晶斜长石、辉石、磁铁矿及玻璃质组成。辉绿玢岩⁴⁰Ar/³⁹Ar同位素定年结果表明，其等时线年龄与坪年龄在误差范围内较为接近，该辉绿玢岩的形成时代介于96～101 Ma，即形成于早白垩世晚期-晚白垩世早期的Albian-Cenomanian阶。结合区域上该期岩浆事件的特点，暗示早白垩世晚期-晚白垩世时期鸡西盆地处于古太平洋板块(Izanagi-Kula 板块 )向东亚大陆边缘斜向俯冲背景之下的弧后伸展环境。

关键词: 基性岩, ⁴⁰Ar/³⁹Ar同位素定年, 鸡西盆地

Abstract: The Chengzihe Formation in Zhangxin area of Jixi basin,Heilongjiang Province is intruded by the algorite sill. The mafic rocks are pure, porphyritic and contain no xenolith. The phenocrysts include ordinary augite and plagioclase and make up 35%-40% of the rock. The diabase has same ⁴⁰Ar/³⁹Ar platform and isochron age of 96-101 Ma within error limit, showing a formation age of the Albian-Cenomanian. Considering the feature of this episode of regional magmatic event, the measured age reveals that the Zhangxin area of the Jixi basin, Heilongjiang Province during the later stage of the Early Cretaceous and Early stage of the Late Cretaceous was under backarc extension within a general tectonic regime of ancient Pacific plate(Izanagi-Kula plate) subduction underneath the East Asia continental plate.

Key words: mafic rock, ⁴⁰Ar/³⁹Ar isotopic dating, Jixi basin

中图分类号:

P618.13

朱占平，刘立，马瑞，邱增凯,马胜晖. 黑龙江省鸡西盆地基性岩⁴⁰Ar/³⁹Ar同位素定年及其地质意义[J]. J4, 2009, 39(2): 238-0243.

ZHU Zhan-ping， LIU Li，MA Rui，QIU Zeng-kai，MA Sheng-hui. ⁴⁰Ar/³⁹Ar Isotopic Dating and Geological Significance of Mafic Rocks from the Jixi Basin, Heilongjiang Province[J]. J4, 2009, 39(2): 238-0243.

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黑龙江省鸡西盆地基性岩⁴⁰Ar/³⁹Ar同位素定年及其地质意义

⁴⁰Ar/³⁹Ar Isotopic Dating and Geological Significance of Mafic Rocks from the Jixi Basin, Heilongjiang Province

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