中文摘要：

位于我国西北部的陇中盆地古近纪—新近纪（第三纪）地层出露较好,并且产出大量哺乳动物化石和植物化石,这为西北地区地层对比和古气候研究提供了良好材料。近几十年,众多学者在陇中盆地的各次级盆地（如西宁盆地、兰州盆地、临夏盆地等）开展了大量古生物学、生物地层学、磁性地层学和古气候学研究,为探讨陇中盆地的构造演化过程和气候演变过程提供了重要参考。本文对陇中盆地第三纪地层年代学和古气候研究已取得的进展进行了初步总结归纳,并提出了需要进一步研究的问题。

英文摘要：

Background aim and scope The well-developed long continuous Paleogene — Neogene fluvio-lacustrine strata（the Tertiary red beds） are exposed in the Longzhong Basin, Northwestern China. The abundant mammalian faunas and phytolite in the red beds provide valuable material for the stratigraphic correlation and paleoenvironmental reconstruction. In recent decades, paleontological, sedimentological, magnetostratigraphical and palynological studies have been conducted in the Longzhong Basin（e.g., Xining Basin, Lanzhou Basin and Linxia Basin）. The environmental evolution in the Longzhong Basin since Cenzoic is likely to be associated with the land-sea redistributions the uplift of the Tibetan Plateau and/or the global cooling. Materials and methods In this study, we review the achievements mentioned above based on the stratigraphic and paleoclimatic research published in recent decades and bring out questions to be solved in future studies. Results The Tertiary beds in the Xining Basin unconformably overlie the Cretaceous Minhe Group, and the initiation of Tertiary beds began at least 55 — 52 Ma ago. Between 52—17 Ma, the continuous deposits in this basin implied a relatively stable sedimentary environment. The Tertiary beds of the Lanzhou Basin unconformably overlie the Cretaceous Hekou Group with an basal age of over 58 Ma. Given the formation of the basin systems in and around the Tibetan Plateau at that time, we speculate that the initiation of Paleogene deposits in these two basins at 58 — 52 Ma may be linked to the Indian-Eurasian continental collision at 65 — 55 Ma. The low sedimentary rate before late Paleogene（32 — 29 Ma） implied a relatively weak tectonic activity in the northeast margin of the Tibetan Plateau after the collision of Indian and Eurasian continent. However, the sedimentary rate increased from 32 — 29 Ma in both basins and a hiatus was observed in the Lanzhou Basin at the boundary of Yehucheng Formation and Xianshuihe Formation（~31 Ma） implying an active tectonic move