Late Cenozoic magnetostratigraphy (11 – 0 Ma) of the Dongshanding and Wangjiashan sections in the Longzhong Basin,western China |
| |
| Authors: | Li Ji-Jun Fang Xiao-Min Van der Voo Rob Zhu Jun-Jie Mac Niocaill Conall Cao Ji-Xiu Zhong Wei Chen Huai-Lu Wang Jianli Wang Jian-Ming Zhang Yie-Chun |
| |
| Institution: | (1) Department of Geography, Lanzhou University, Lanzhou, Gansu, 730 000, China;(2) Department of Geological Sciences, the University of Michigan, Ann Arbor, MI, 48109-1063, U.S.A |
| |
| Abstract: | A paleomagnetic study of the 510-m-thick Wangjiashan section of Late Miocene and Pliocene terrestrial sediments reveals a fairly complete reversal record with ages from 11 to 1.8 Ma. The magnetostratigraphy of the Dongshanding section, located nearby, reveals a partially overlapping reversal record with ages from 2.2 to 0 Ma, and facilitates correlation of the Wangjiashan section with the global polarity time scale. A new stratigraphic division of the Wangjiashan section replaces the name Linxia formation by five new formation names, based on lithologic variation and mammalian fossil finds. The new formations and their magnetostratigraphically determined ages are: Dongshan Formation (c. 1.75–2.6 Ma), Jishi Fm. (c. 2.6–3.6 Ma), Hewangjia Fm. (4.5–6.0 Ma), Liushu Fm. (6.0–7.6 Ma), and Dongxiang Fm. (7.6–c. 12 Ma). The Neogene stratigraphy and fossil mammals suggest that the nearby part of the Tibetan Plateau experienced a persistent denudation during the Late Miocene and Early Pliocene, but that it was uplifted more rapidly at about 3.6 Ma. |
| |
| Keywords: | reversals Miocene Pliocene |
| 本文献已被 SpringerLink 等数据库收录！ |
|
