古地理学报2012，Vol.14Issue(5)：571-582,12.
青藏高原东缘盐源盆地古近纪风成沙丘及其古地理意义
The Paleogene aeolian dunes and their palaeogeographic significance in Yanyuan Basin, eastern margin of the Tibetan Plateau
摘要
Abstract
Red sandstones with large-scale cross-beddings in high dip angles were developed in Yanyuan Basin during the sedimentary period of Eocene Lijiang Formation. Its exact origin is significant for revising the Paleogene palaeogeographic pattern in the eastern margin of the Tibetan Plateau and reconstructing the evolutionary process of the Cenozoic arid belt and palaeoclimate in East Asia. Sedimentary characteristics of these red sandstones from the Eocene Lijiang Formation in Yanyuan Basin were systematically analyzed in this paper. The results show that their lithology, grain size distribution, surface features of quartz grains and sedimentary structures are clearly different from aqueous deposits, but perfectly consistent with the corresponding sedimentary characteristics of typical aeolian dunes, indicating that these red sandstones should be attributed to aeolian dunes. Combined with the Paleogene palaeoclimate state, atmospheric circulation pattern and geotectonic setting of the study area, it is further inferred that the Eocene aeolian dunes in Yanyuan Basin could be deposited in the desert environment, which was located in the Chinese Paleogene arid belt. Furthermore, on the basis of existing relevant research data, it is also confirmed that there was an aeolian dune enrichment zone in eastern margin of the Tibetan Plateau during the Early-Mid Paleogene epoch.关键词
风成沙丘/沉积特征/古近纪/始新世/古地理/盐源盆地/青藏高原东缘Key words
aeolian dunes/ sedimentary characteristics/ Paleogene/ Eocene / palaeogeography/ Yanyuan Basin/ eastern margin of the Tibetan Plateau分类
天文与地球科学引用本文复制引用
崔晓庄,江新胜,伍皓,熊国庆,卓皆文,陆俊泽..青藏高原东缘盐源盆地古近纪风成沙丘及其古地理意义[J].古地理学报,2012,14(5):571-582,12.基金项目
国家自然科学基金项目(批准号:40372064)和中国地质调查局青藏基础地质综合研究项目(编号:1212010610101)联合资助 （批准号:40372064）
