首页|Location of the Lhasa terrane in the Late Cretaceous and its implications for crustal deformation

Location of the Lhasa terrane in the Late Cretaceous and its implications for crustal deformation

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  • NSTL
  • Elsevier
The Cenozoic crustal deformation of the Asian continent is constrained by the location of its southern margin in the Late Cretaceous, which is, however, affected by potential remagnetization and inclination shallowing of redbeds in the Linzhou Basin. Our paleomagnetic results from the Shexing Formation redbeds in the Late Cretaceous yield a mean paleo-inclination of similar to 21.5 degrees, consistent with the recalculation of previous data. Rock-magnetic, paleomagnetic and petrographic analyses indicate that the redbeds have recorded the original paleomagnetic field and have not suffered from significant inclination shallowing. The paleopole from 70 red beds sites is at 71.8 degrees N, 281.5 degrees E with A(95) = 2.6 degrees, yielding a paleolatitude of similar to 12.0 +/- 2.6 degrees N at -70-91 Ma for the Linzhou Basin. This result indicates a latitudinal convergence of 1264 +/- 477 km north of the sampling area within Asia since the Late Cretaceous. Combined with previous data, our results show that the southern margin of Asia was at similar to 11-15 degrees N in the Late Cretaceous, aligning in a WNW-ESE direction, which is similar to its presentday orientation. A review of available data shows that the sharp bending of the southern margin of Asia around the eastern Himalayan syntaxis (EHS) is probably due to different crustal movement patterns around the EHS. The shape of the southern margin of Asia determines the arc-shaped orientation of Himalayan orogen.

Tibetan PlateauPaleomagnetismNorthward movementCrustal shorteningLatitudinal convergenceRED-BEDSSOUTHERN MARGINPALEOMAGNETIC CONSTRAINTSVOLCANIC-ROCKSTECTONIC EVOLUTIONTIBETAN PLATEAUSHALLOW INCLINATIONSQIANGTANG COLLISIONCLOCKWISE ROTATIONTETHYAN HIMALAYA

Ma, Yiming、Wang, Qiang、Yang, Tianshui、Ou, Quan、Zhang, Xiuzheng、Dan, Wei、Zhang, Shihong、Wu, Huaichun、Li, Haiyan、Cao, Liwan、Wang, Jun、Zou, Di、Wang, Huapei

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China Univ Geosci

Chengdu Univ Technol

Chinese Acad Sci

2022

10.1016/j.palaeo.2021.110821

Palaeogeography, Palaeoclimatology, Palaeoecology

Palaeogeography, Palaeoclimatology, Palaeoecology

ISSN：0031-0182
年,卷(期)：2022.588
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