1. Главная
  2. Ресурсы
  3. Библиотечный поиск
Magnetostratigraphyof Cenozoic sedimentsfrom the XiningBasin: Tectonicimplications for thenortheastern TibetanPlateau Shuang DaiXiaomin FangGuillaume Dupont‐Nivet2006 год

Magnetostratigraphy of Cenozoic sediments from the Xining Basin: Tectonic implications for the northeastern Tibetan Plateau
статья из журнала

Полный текстСтраница публикацииПубликация в OpenAlex
Аннотация: The Xining subbasin of the Longzhong basin holds the longest continuous Cenozoic stratigraphic record at the margin of the northeastern Tibetan Plateau. Despite a rich biostratigraphic content (including the Xiejia mammal fauna), the tectonic evolution of the basin is largely unconstrained. In this study we present stratigraphic, biostratigraphic, and magnetostratigraphic results that provide a basis for reconstructing the Cenozoic tectonic evolution of the Xining basin with respect to adjacent regions of the northeastern Tibetan Plateau. Magnetostratigraphic analysis from three red bed sections in the Xining basin indicates continuous deposition at low and nearly constant accumulation rates (average 2.2 cm/kyr) from 52.0 to 17.0 Ma. We interpret this result to indicate that no major regional tectonic event implying large sediment accumulation variations has affected the Xining basin deposition during this considerable time window. In detail, accumulation rate variations outline a three‐stage evolution with 1.8 cm/kyr from 52.0 Ma to 34.5 Ma, 4.1 cm/kyr from 34.5 to 31.0 Ma, and 2.3 cm/kyr from 31.0 to 17.0 Ma. The second‐order increase between 34.5 and 31.0 Ma can be interpreted to result from either a distal tectonic event or to be of climatic origin. Although the region was tectonically quiescent for much of the Cenozoic, tectonic activity occurred during basin initiation (or reactivation) at circa 55.0–52.5 Ma and during intense basin deformation after 17.0 Ma.
Год издания: 2006
Авторы: Shuang Dai, Xiaomin Fang, Guillaume Dupont‐Nivet, Chunhui Song, Gao Jun-ping, Wout Krijgsman, Cor G. Langereis, Weilin Zhang
Издательство: American Geophysical Union
Источник: Journal of Geophysical Research Atmospheres
Ключевые слова: Evolution and Paleontology Studies, Geology and Paleoclimatology Research, Geological and Geochemical Analysis
Другие ссылки: Journal of Geophysical Research Atmospheres (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (PDF)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)