Charreau, Julien and Chen, Yan and Gilder, Stuart and Dominguez, Stéphane and Avouac, Jean-Philippe and Sen, Sevket and Sun, Dongjiang and Li, Yongan and Wang, Wei-Ming (2005) Magnetostratigraphy and rock magnetism of the Neogene Kuitun He section (northwest China): implications for Late Cenozoic uplift of the Tianshan mountains. Earth and Planetary Science Letters, 230 (1-2). pp. 177-192. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20110110-152743244
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In order to better constrain the tectonic evolution of central Asia under the influence of the India–Asia collision, we carried out a magnetostratigraphic study at the Kuitun He section, on the northern flank of the Tianshan range (northwest China). A total of 801 samples were collected from a 1559-m-thick section, which is composed mainly of fluvio-lacustrine sandstone and conglomerate. Stepwise thermal and alternating field demagnetization isolated a linear magnetization component that decays univectorally toward the origin and likely represents a primary magnetization principally carried by magnetite. From this component, 29 magnetic polarity intervals were identified. They correlate between ~3.1 and ~10.5 Ma with the reference magnetic polarity time scale, indicating a relatively constant sedimentation rate with an average of 0.21±0.01 mm/year. We also performed a suite of rock magnetic experiments designed to track time-transgressive changes in the sedimentary record. From the rock magnetic parameters, together with the constant sedimentation rate, we conclude that the Tianshan mountains were actively uplifting by ~10.5 Ma.
|Additional Information:||© 2004 Elsevier B.V. Received 2 June 2004; revised 2 November 2004; accepted 4 November 2004. Editor: E. Bard. Available online 24 December 2004. This study was financed by the French program ECLIPSE and the Chinese project 973 No. G1999043303 and No. 1999043509. We thank Peter Molnar and Lisa Tauxe for their very constructive reviews. This is IPGP contribution 2924.|
|Group:||Caltech Tectonics Observatory, Caltech Tectonics Observatory. Indo-Asian Collision Zone, Seismological Laboratory|
|Subject Keywords:||Tianshan; uplift; magnetostratigraphy; AMS|
|Other Numbering System:|
|Official Citation:||Julien Charreau, Yan Chen, Stuart Gilder, Stephane Dominguez, Jean-Philippe Avouac, Sevket Sen, Dongjiang Sun, Yongan Li, Wei-Ming Wang, Magnetostratigraphy and rock magnetism of the Neogene Kuitun He section (northwest China): implications for Late Cenozoic uplift of the Tianshan mountains, Earth and Planetary Science Letters, Volume 230, Issues 1-2, 30 January 2005, Pages 177-192, ISSN 0012-821X, DOI: 10.1016/j.epsl.2004.11.002. (http://www.sciencedirect.com/science/article/B6V61-4F3FF17-2/2/027ce7b1d7e58ad101abcabadacf95de)|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||25 Jan 2011 18:39|
|Last Modified:||11 Jun 2015 13:57|
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