滇西施甸地区泥盆系—石炭系接触关系新认识
New cognition of the Devonian-Carboniferous contact relationship in Shidian area, western Yunnan Province
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摘要: 滇西保山地块晚古生代地层分布较广，研究程度较高，但对泥盆系—石炭系界线属性的认识尚存在争议，以往的研究成果都认为属假整合接触。通过开展施甸地区1∶5万区域地质调查，在原中上泥盆统何元寨组上部采获大量法门期—杜内期的牙形石化石，并确认何元寨组与下石炭统香山组的沉积相序为渐变过渡，提出施甸地区的泥盆系与石炭系为整合接触，为保山地块的构造演化研究提供新的资料。Abstract: The Late Paleozoic strata are extensively exposed in Baoshan massif of western Yunnan. Research work has been relatively in detail and, as a result, many achievements have been obtained. However, the Devonian-Carboniferous boundary was previously considered to be of pseudoconformity contact. In recent years, through 1∶50000 regional geological survey in Shidian area, we collected a large number of Famennian-Tournaisian conodonts in upper Heyuanzhai Formation which was previously assigned to Middle-Late Devonian and confirmed that the sequence of sedimentary facies between Heyuanzhai Formation and overlying Xiangshan Formation is a gradual transition relationship. Therefore, the authors propose for the first time that the Devonian-Carboniferous contact relationship is conformable contact, and this result will provide the latest information for the tectonic evolution of Baoshan massif.
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Keywords:
- contact relationship /
- Devonian /
- Carboniferous /
- conodont /
- Shidian area in western Yunnan
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