| 东川、滇中地区中元古代地层格架 |
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| 引用本文： | 尹福光,孙志明,白建科.东川、滇中地区中元古代地层格架[J].地层学杂志,2011(1):49-54. |
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| 作者姓名： | 尹福光 孙志明 白建科 |
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| 作者单位： | 成都地质矿产研究所; |
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| 基金项目： | 国土资源大调查项目“西南地区基础地质调查综合研究”(No.1212010610213); 国家973项目(No.2009CB421003); 国家自然科学基金项目(No.40773001) |
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| 摘 要： | 东川、滇中地区是上扬子陆块出露元古代地层最广泛的地区,但露头又断续分布在不同的地点.由于缺乏古生物及年龄资料,在不同地区多以岩性进行地层划分与对比,而出现了"正层"与"倒层"观点之分歧.通过对东川及滇中地区地层中所夹的火山岩年龄测试及重要界面的观察与研究,发现东川地区黑山组凝灰岩中锆石U-PbSHRIMP年龄为1503...
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| 关 键 词： | 地层层序 地层格架 锆石U-Pb SHRIMP年龄 中元古代 东川 云南 |
STRATIGRAPHIC FRAMEWORK OF THE MESOPROTEROZOIC IN DONGCHUAN AND CENTRAL YUNNAN REGION |
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| YIN Fu-guang,SUN Zhi-ming , BAI Jian-ke Chengdu Institute of Geology , Mineral Resource,Chengdu.STRATIGRAPHIC FRAMEWORK OF THE MESOPROTEROZOIC IN DONGCHUAN AND CENTRAL YUNNAN REGION[J].Journal of Stratigraphy,2011(1):49-54. |
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| Authors: | YIN Fu-guang SUN Zhi-ming BAI Jian-ke Chengdu Institute of Geology Mineral Resource Chengdu |
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| Institution: | YIN Fu-guang,SUN Zhi-ming and BAI Jian-ke Chengdu Institute of Geology and Mineral Resource,Chengdu 610081 |
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| Abstract: | The Proterozoic strata outcrop widely in Dongchuan and Central Yunnan but the outcrops are discontinuously distributed in these areas.Due to the lack of paleontological and age data,there have been conficting views on the stratigraphic sequence and correlation of these strata.We here report a SHRIMP zircon age of 1503±17 Ma from a volcanic tuff in the Heishan Formation of the Dongchuan region,and a 1047±15 Ma SHRIMP zircon age from the Heishantou Formation in Central Yunnan.Thus,the two Formations are of different depostional ages and ther cannot be correlated.We also confirm that the stratigraphic sequences in both regions are of "nomal stratigraphic sequence".Therefore,it is recommended that the Mesoproterozoic stratigraphic units be maintained separately in these two regions because they are of different ages. |
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| Keywords: | stratigraphic sequence stratigraphic framework SHRIMP zircon Mesoproterozoic Dongchuan Central Yunnan |
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