| 黑龙江省鸡西盆地基性岩~(40)Ar/~(39)Ar同位素定年及其地质意义 |
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| 引用本文： | 朱占平,刘立,马瑞,邱增凯,马胜晖.黑龙江省鸡西盆地基性岩~(40)Ar/~(39)Ar同位素定年及其地质意义[J].吉林大学学报(地球科学版),2009,39(2). |
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| 作者姓名： | 朱占平 刘立 马瑞 邱增凯 马胜晖 |
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| 作者单位： | 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 |
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| 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.
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| 关 键 词： | 基性岩 40Ar/39Ar同位素定年 鸡西盆地 |
~(40)Ar/~(39)Ar Isotopic Dating and Geological Significance of Mafic Rocks from the Jixi Basin,Heilongjiang Province |
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| ZHU Zhan-ping,LIU Li,MA Rui,QIU Zeng-kai,MA Sheng-hui.~(40)Ar/~(39)Ar Isotopic Dating and Geological Significance of Mafic Rocks from the Jixi Basin,Heilongjiang Province[J].Journal of Jilin Unviersity:Earth Science Edition,2009,39(2). |
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| Authors: | ZHU Zhan-ping LIU Li MA Rui QIU Zeng-kai MA Sheng-hui |
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| Institution: | ZHU Zhan-ping1,LIU Li1,MA Rui1,QIU Zeng-kai2,MA Sheng-hui11.College of Earth Sciences,Jilin University,Changchun 130061,China2.College of Instrumentation & Electrical Engineering,China |
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| 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 ... |
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| Keywords: | mafic rock 40Ar/39Ar isotopic dating Jixi basin |
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