检索结果-南通市图书馆

Comment on planation surface

在线全文

学校读者我要写书评

暂无评论

引用

Chinese Science Bulletin 1999年第22期44卷 2017-2022页

作者： Zhiju Cui Dewen Li Yongqiu Wu Gengnian Liu Peking Univ Dept Geog Beijing 100871 Peoples R China Beijing Normal Univ State Educ Commiss Open Lab Environm Change & Nat Disaster Beijing 100875 Peoples R China

Planation surfaces includes peneplain, pediment and etchplain, which differ from each other in formation and distribution. The double leveling surfaces theory offered by Budel can be used to explain the landforms in limestone areas. According to Budel, that the residue is the upper layer of a planation surface is very important in studying the formation

关键词： planation surface peneplain pediment etchplain.

THE UPLIFT PROCESS OF QING-ZANG PLATEAU

在线全文

学校读者我要写书评

暂无评论

引用

地学前缘 2000年第S1期7卷 356-357页

作者： Li Yongzhao 1, Wang Yunsheng 1,Lu Yan 2[WT5,5”BX](1 Chengdu University of Technology, Chengdu 610059,China 2 Bureau of Geology and Mineral Resource Xizang Autonomous Region, Lhasa 850000,China)

The uplift of Qing—Zang (Qinghai—Tibet) plateau was the most important event in the late Cenozoic, which deeply influenced the environments of the World, especially those of China. Since the uplift is so important and complex that it has been become the research focus of earth science. Nevertheless, the initial time and evolution process of the uplift is still controversial.1\ The initial time of the uplift\;Qing\|Zang plateau is a union geological\|geomorphic unit, which is composed of several geological\|structural units. Each geological\|structural unit has itself exchange history of sea\|continent (basin\|mountain); the exchange time of the different parts differs. Therefore, the initial time of some part of the plateau is not the uplift time of the whole plateau. The plateau is the highland with high height above sea level, little relief of the top, large area and steep boundary. The plateau plane is the paleo\|peneplain, which was formed by the uplift of the plateau after the peneplanation. Therefore, the initial time of the uplift should be counted from the time that the peneplain had been formed.

关键词： Qing—Zang plateau uplift process peneplain

Climatic and tectonic controls on the fluvial morphology of the Northeastern Tibetan Plateau （China）

在线全文

学校读者我要写书评

暂无评论

引用

Journal of Geographical Sciences 2017年第11期27卷 1325-1340页

作者： WANG Xianyan Jef VANDENBERGHE LU Huayu Ronald VAN BALEN School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210023 China Department of Earth Sciences VU University Amsterdam De Boelelaan 1085 1081 HV Amsterdam The Netherlands

The geomorphological evolution of the Northeastern Tibetan Plateau （NETP） could provide valuable information for reconstructing the tectonic movements of the region. And the considerable uplift and climatic changes at here, provide an opportunity for studying the im- pact of tectonic and monsoon climate on fluvial morphological development and sedimentary architecture of fluvial deposits. The development of peneplain-like surface and related land- scape transition from basin filling to incision indicate an intense uplift event with morphologi- cal significance at around 10-17 Ma in the NETP. After that, incision into the peneplain was not continuous but a staircase of terraces, developed as a result of climatic influences. In spite of the generally persisting uplift of the whole region, the neighbouring tectonic blocks had different uplift rates, leading to a complicated fluvial response with accumulation terraces alternating with erosion terraces at a small spatial and temporal scale. The change in fluvial activity as a response to climatic impact is reflected in the general sedimentary sequence on the terraces from high-energy （braided） channel deposits （at full glacial） to lower-energy de- posits of small channels （towards the end of the glacial）, mostly separated by a rather sharp boundary from overlying flood-Ioams （at the glacial-interglacial transition） and overall soil formation （interglacial）. Pronounced incision took place at the subsequent warm-cold transi- tions. In addition, it is hypothesized that in some strongly uplifted blocks energy thresholds could be crossed to allow terrace formation as a response to small climatic fluctuations （10^3-10^4 year timescale）. Although studies of morpho-tectonic and geomorphological evolu- tion of the NETP, improve understanding on the impacts of tectonic motions and monsoonal climate on fluvial processes, a number of aspects, such as the distribution and correlation of peneplain and the related morphological feature

关键词： peneplain Miocene uplift fluvial terraces fluvial deposit climatic impact tectonic impact Northeastern Tibetan Plateau