| 西藏拉萨地块设兴组孢粉化石新发现及其地层学意义 |
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| 引用本文：纪占胜,杨欣德,臧文拴,姚建新,吴中海,武桂春.2002.西藏拉萨地块设兴组孢粉化石新发现及其地层学意义[J].地球学报,23(4):323-328. |
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| 基金项目:地质调查局地质大调查项目(DKD9901001)，国家自然科学基金项目(49972014) |
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| 中文摘要:拉萨地体的典中－那玛剖面设兴组上部新发现孢粉组合，其特征为：孢粉化石多为第三纪常见分子，未发现早白垩世和晚白垩世特征分子。因此样品产出的层位不可能属于白垩纪的沉积。孢粉组合以落叶，阔叶植物为主体，主要为桦科的桤木粉（Alnipollenites)，桦粉（Betulaepollenites)，枥粉（Carpiniptes），山毛榉科的栎粉（Quercodites)胡桃科的胡桃粉（Juglanspollentites)，榆科的榆粉（Ulmipollenites)，椴科的椴粉（Tiliapollenites)等 |
| 中文关键词:拉萨地块 设兴组 典中那玛剖面 孢粉 |
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| New Palynological Materials from the Shexing Formation in the Lhasa Block, Tibet, and Their Stratigraphic Significance |
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| Abstract:New materials of sporopollen were discovered in the upper part of the Shexing Formation along the Dianzhong Nama section of the Lhasa block. The sporopollen assemblage has the following characteristics:Most of the sporopollens found are common elements of Tertiary, so the related strata cannot be Cretaceous sediments; Deciduous and latifoliate vegetation, including Alnipollenites, Betulaepollenites, Carpiniptes, Quercoidites, Juglanspollenites, Ulmipollenites, and Tiliaepollenites, constitute dominant species in this assemblage; Tropic sporopollen and semi tropical vegetation occur in a relatively small amount. Herbage sporopollens, such as Chenopodiaceae, Compositae, Gramineae, and Polygonaceae, are rarely seen. All this indicates that the climate was not drought when they deposited. Triporopollenites and Tricolporopllenites which are very widely spread in Palaeogene also occur in small amounts; The whole conditions of sporopollen imply warm cool and moist climate of temperate zone at that time, suggesting wide distribution of deciduous and latifoliate forests. The Sporollen assemblage is close to that of the middle and late Palaeogene, probably belonging to Eocene Oligocene. The condition of the sporollen assemblage in the upper part of the Shexing Formation is similar to that of the middle Member of Niubao Formation in Lunpola Basin, indicating that the age of the sporopollen assemblage was nearly contemporaneous with the middle Member of Niubao Formation or a little later. The Shexing Formation includes not only the upper part of the Upper Cretaceous but also the lower part of the Lower Tertiary. |
| keywords:Lasa Terrance Shexing Formation Dianzhong-Nama Section Sporopollen |
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