| 滇东曲靖地区志留系层序地层特征和年代地层界线再讨论 |
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| 引用本文： | 单卫国,罗刚.滇东曲靖地区志留系层序地层特征和年代地层界线再讨论[J].地层学杂志,1997,21(1):68-76. |
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| 作者姓名： | 单卫国 罗刚 |
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| 作者单位： | 云南省地矿局职工大学 |
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| 摘 要： | 曲靖地区志留—泥盆纪地层连续沉积，生物门类丰富，长期以来倍受国内外地质学家关注。笔者根据层序地层学理论和研究方法，在关底组至翠峰山组西山村段之间确定了３个三级相对海平面变化旋回（层序），这些三级旋回（层序）和旋回边界（层序边界）与Ｖａｉｌ等（１９７７）确定的全球性相对海平面变化旋回有很好的可比性。据此，结合生物组合分析曲靖地区志留系的年代界线为：（１）Ｓ Ｄ界线在玉龙寺组第二段之底（上易剥页岩之底、最大海泛面），但有一枚卢德洛上带化石Ｏｚａｒｋｏｄｉｎａｃｒｉｓｐａ出现在于上易剥页岩的中部；（２）Ｐｒｉｄｏｌｉａｎ Ｌｕｄｌｏｖｉａｎ界线置于妙高组第二段之底（第三个层序边界）；（３）Ｌｕｄｌｏｖｉａｎ Ｗｅｎｌｏｃｋｉａｎ界线置于关底组第一段上部（第二个层序边界）。
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| 关 键 词： | 志留系，年代地层界线，海平面变化旋回，全球对比，层序地层，滇东 |
Characterics of the Silurian sequence stratigraphy of Qujing, Eastern Yunnan and rediscussion about the chronostratigraphic boundaries |
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| Shan Weiguo,Luo Gang,Wu Zhenguo.Characterics of the Silurian sequence stratigraphy of Qujing, Eastern Yunnan and rediscussion about the chronostratigraphic boundaries[J].Journal of Stratigraphy,1997,21(1):68-76. |
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| Authors: | Shan Weiguo Luo Gang Wu Zhenguo |
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| Abstract: | Based on the theory and study method of sequence stratigraphy, we discovered three 3rd order relative sea level changes from the Xishancun Member of the Guandi Formation to the Cuifengshan Formation.The 3rd order cycels may be well correlated with the global cycles of relative sea level changes(Vail et al.,1977).Based on this correlation and the biologic assemblages,the Silurian chronostratigraphic boundaries are determined as follows:(1)Silurian Devonian boundary is placed at the base of the second member of the Yulongsi Formation (the base of the upper black shale,maximum marine flooding surface),but that there is a conodont fossil (Ozarkodina crispa)in the middle part of the upper black shale;(2)Pridolian Ludlovian boundary placed at the base of the second member of the Miaogao Formation (3rd sequence boundary);(3)Ludlovian Wenlockian boundary placed at the upper part of the first member of the Guandi Formation(2nd sequence boundary). |
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| Keywords: | Silurian correlation sea level change sequence stratigraphy Yunnan |
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