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Article: Neogene uplift of the Tian Shan Mountains observed in the magnetic record of the Jingou River section (northwest China)

TitleNeogene uplift of the Tian Shan Mountains observed in the magnetic record of the Jingou River section (northwest China)
Authors
Issue Date2009
PublisherAmerican Geophysical Union
Citation
Tectonics, 2009, v. 28 n. 2 How to Cite?
AbstractThe Tian Shan Mountains constitute central Asia's longest and highest mountain range. Understanding their Cenozoic uplift history thus bears on mountain building processes in general, and on how deformation has occurred under the influence of the India-Asia collision in particular. In order to help decipher the uplift history of the Tian Shan, we collected 970 samples for magnetostratigraphic analysis along a 4571-m-thick section at the Jingou River (Xinjiang Province, China). Stepwise alternating field and thermal demagnetization isolate a linear magnetization component that is interpreted as primary. From this component, a magnetostratigraphic column composed of 67 polarity chrons are correlated with the reference geomagnetic polarity timescale between ∼1 Ma and ∼23.6 Ma, with some uncertainty below ∼21 Ma. This correlation places precise temporal control on the Neogene stratigraphy of the southern Junggar Basin and provides evidence for two significant stepwise increases in sediment accumulation rate at ∼ 16-15 Ma and ∼11-10 Ma. Rock magnetic parameters also undergo important changes at ∼ 16-15 Ma and ∼ 11 -10 Ma that correlate with changes in sedimentary depositional environments. Together with previous work, we conclude that growth history of the modern Tian Shan Mountains includes two pulses of uplift and erosion at ∼16-15 Ma and ∼11-10 Ma. Middle to upper Tertiary rocks around the Tian Shan record very young (<∼5 Ma) counterclockwise paleomagnetic rotations, on the order of 15° to 20°, which are interpreted as because of strain partitioning with a component of sinistral shear that localized rotations in the piedmont.
Persistent Identifierhttp://hdl.handle.net/10722/92374
ISSN
2015 Impact Factor: 3.75
2015 SCImago Journal Rankings: 2.628
ISI Accession Number ID
Funding AgencyGrant Number
French program ECLIPSE
PRAT05-02/T06-04
ANR
kzcx3-sw-147
2005CB422101
Funding Information:

The French program ECLIPSE, the Chinese project kzcx3-sw-147 and 973 2005CB422101, PRA (T05-02/T06-04) and ANR financed this study. We thank Guillaume Dupont-Nivet and an anonymous reviewer for their critical reviews that greatly improved the quality of the manuscript. This is IPGP contribution 2388.

References

 

DC FieldValueLanguage
dc.contributor.authorCharreau, Jen_HK
dc.contributor.authorChen, Yen_HK
dc.contributor.authorGilder, Sen_HK
dc.contributor.authorBarrier, Len_HK
dc.contributor.authorDominguez, Sen_HK
dc.contributor.authorAugier, Ren_HK
dc.contributor.authorSen, Sen_HK
dc.contributor.authorAvouac, J-Pen_HK
dc.contributor.authorGallaud, Aen_HK
dc.contributor.authorGraveleau, Fen_HK
dc.contributor.authorWang, Qen_HK
dc.date.accessioned2010-09-17T10:44:10Z-
dc.date.available2010-09-17T10:44:10Z-
dc.date.issued2009en_HK
dc.identifier.citationTectonics, 2009, v. 28 n. 2en_HK
dc.identifier.issn0278-7407en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92374-
dc.description.abstractThe Tian Shan Mountains constitute central Asia's longest and highest mountain range. Understanding their Cenozoic uplift history thus bears on mountain building processes in general, and on how deformation has occurred under the influence of the India-Asia collision in particular. In order to help decipher the uplift history of the Tian Shan, we collected 970 samples for magnetostratigraphic analysis along a 4571-m-thick section at the Jingou River (Xinjiang Province, China). Stepwise alternating field and thermal demagnetization isolate a linear magnetization component that is interpreted as primary. From this component, a magnetostratigraphic column composed of 67 polarity chrons are correlated with the reference geomagnetic polarity timescale between ∼1 Ma and ∼23.6 Ma, with some uncertainty below ∼21 Ma. This correlation places precise temporal control on the Neogene stratigraphy of the southern Junggar Basin and provides evidence for two significant stepwise increases in sediment accumulation rate at ∼ 16-15 Ma and ∼11-10 Ma. Rock magnetic parameters also undergo important changes at ∼ 16-15 Ma and ∼ 11 -10 Ma that correlate with changes in sedimentary depositional environments. Together with previous work, we conclude that growth history of the modern Tian Shan Mountains includes two pulses of uplift and erosion at ∼16-15 Ma and ∼11-10 Ma. Middle to upper Tertiary rocks around the Tian Shan record very young (<∼5 Ma) counterclockwise paleomagnetic rotations, on the order of 15° to 20°, which are interpreted as because of strain partitioning with a component of sinistral shear that localized rotations in the piedmont.en_HK
dc.languageengen_HK
dc.publisherAmerican Geophysical Unionen_HK
dc.relation.ispartofTectonicsen_HK
dc.titleNeogene uplift of the Tian Shan Mountains observed in the magnetic record of the Jingou River section (northwest China)en_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2007TC002137en_HK
dc.identifier.scopuseid_2-s2.0-69549088054en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-69549088054&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume28en_HK
dc.identifier.issue2en_HK
dc.identifier.isiWOS:000264867400001-

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