| 吉林红旗岭地区造山后镁铁-超镁铁岩体的年代测定及其意义 |
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| 引用本文： | 张广良,吴福元.吉林红旗岭地区造山后镁铁-超镁铁岩体的年代测定及其意义[J].地震地质,2005,27(4):600-608. |
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| 作者姓名： | 张广良 吴福元 |
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| 作者单位： | 1. 中国地震局地质研究所,地震动力学国家重点实验室,北京,100029
2. 中国科学院地质与地球物理研究所,北京,100029 |
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| 摘 要： | 吉林省中部红旗岭地区镁铁-超镁铁杂岩广泛发育,年代学资料表明,红旗岭-漂河川岩体形成于晚三叠纪(距今约216Ma),与该区A型花岗岩的年龄相当,但略微年轻一些。岩石学和地球化学特征表明,镁铁-超镁铁岩普遍可见包橄结构,橄榄石晶体平衡岩浆属于高MgO玄武质岩浆,微量元素和同位素模拟结果均显示岩浆源区主要为亏损地幔或新生岩石圈地幔。根据这些结果,同时结合相关研究,提出这些镁铁-超镁铁杂岩体的形成与该区大量造山后A型花岗岩带的形成相吻合,其形成主要是由于造山后期岩石圈板块的拆沉减薄效应,软流圈地幔上隆及大量幔源岩浆上侵,底垫于地壳底部,并经历了强烈的结晶分异作用
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| 关 键 词： | 镁铁-超镁铁杂岩 年代学 造山后 岩石成因 红旗岭地区 |
| 文章编号： | 0253-4967（2005）04-0600-09 |
| 收稿时间： | 2005-08-25 |
| 修稿时间： | 2005-10-17 |
GEOCHRONOLOGY SIGNIFICANCES OF THE POST-OROGENIC MAFIC-ULTRAMAFIC ROCKS IN HONGQILING AREA OF JILIN PROVINCE, NE CHINA |
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| ZHANG Guang-liang,WU Fu-yuan.GEOCHRONOLOGY SIGNIFICANCES OF THE POST-OROGENIC MAFIC-ULTRAMAFIC ROCKS IN HONGQILING AREA OF JILIN PROVINCE, NE CHINA[J].Seismology and Geology,2005,27(4):600-608. |
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| Authors: | ZHANG Guang-liang WU Fu-yuan |
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| Affiliation: | 1 State Key Laboratory of Earthquake Dynamics,Institute of Geology, China Earthquake Administration, Beijing 100029, China; 2Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Mafic-ultramafic complexes are widespread in Hongqiling area in central Jinlin Province, NE China. The Hongqiling complex comprises pyroxenite, olivine websterite, lherzolite, gabbro and leucogabbro. Based on the latest geochronological results, these intrusions yield a zircon U-Pb age of about 216Ma BP, which implicates they emplaced in late Triassic and the mafic-ultramafic complexes are post-orogenic in origin. These ages are coeval with the emplacement of A-type granites in the area, but slightly younge |
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| Keywords: | mafic-uhramafic complexes geochronology post-orogenic processes petrogenesis Hongqiling area |
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