滇西施甸地区泥盆系-石炭系接触关系新认识

滇西保山地块晚古生代地层分布较广，研究程度较高，但对泥盆系一石炭系界线属性的认识尚存在争议，vJ,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一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。

New cognition of the Devonian-Carboniferous contact relationship in Shidian area,western Yunnan Province.

The Late Paleozoic strata are extensively exposed in Baoshan massif of western Yunnan. Research work has been rela- tively 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 as- signed to Middle-Late Devonian and confirmed that the sequence of sedimentary facies between Heyuanzhai Fornlation and over- lying 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.