Magnetostratigraphy and rock magnetism of the Neogene Kuitun He section (northwest China): implications for Late Cenozoic uplift of the Tianshan mountains. - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Earth and Planetary Science Letters Année : 2005

Magnetostratigraphy and rock magnetism of the Neogene Kuitun He section (northwest China): implications for Late Cenozoic uplift of the Tianshan mountains.

Résumé

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.

Domaines

Stratigraphie
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Dates et versions

hal-00023363 , version 1 (23-05-2006)

Identifiants

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Julien Charreau, Yan Chen, Stuart A. Gilder, Stéphane Dominguez, Jean-Philippe Avouac, et al.. 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, 2005, 230, pp.1-2, 177-192. ⟨10.1016/j.epsl.2004.11.002⟩. ⟨hal-00023363⟩
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