Late Pleistocene slip rate of the central Haiyuan fault constrained from OSL, 14C, and cosmogenic isotope dating and high-resolution topography - Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg Accéder directement au contenu
Article Dans Une Revue Geological Society of America Bulletin Année : 2020

Late Pleistocene slip rate of the central Haiyuan fault constrained from OSL, 14C, and cosmogenic isotope dating and high-resolution topography

Jing Liu-Zeng
  • Fonction : Auteur
Yann Klinger
Michael Oskin
  • Fonction : Auteur
Jinyu Zhang
  • Fonction : Auteur
Peng Wang
Pengtao Wang
  • Fonction : Auteur
Wei Wang​
Wenqian Yao
  • Fonction : Auteur

Résumé

To better constrain the long-term millennial slip-rate of the Haiyuan fault in its central part, we revisit the site of Daqing (or Sangedun at 102.7°E in Gaudemer et al., 1995). We used terrestrial LiDAR to build a high-resolution DEM and Uncrewed Aerial Vehicle to build an aerial photomosaic with ~0.1 m resolution to survey the offset terraces, their geomorphology and the fault trace. We refine the geomorphological interpretation of the site, measure terrace riser offsets and determine their relation to terrace formation. The well-constrained age of the highest terrace T3 at 13.7 ± 1.5 ka determined from the combination of surface and sub-surface OSL, 14 C, and terrestrial in situ 10 Be cosmogenic radionuclide (CRN) dating, associated with an offset of 88 m, yields a late Pleistocene minimum slip-rate of 6.5 ± 1 mm/yr. The less well constrained offset (<72 ± 3 m) and age (>9.3 ± 0.6 ka) of terrace T2 yield a maximum slip rate of 7.7 ± 0.6 mm/yr. The smallest offset of a gully incised into T1 of 6.0 ± 0.5 m is potentially associated with the most recent slip event that occurred in the last millennia. The Daqing site provides a well constrained slip rate of the Haiyuan fault that is consistent with geodetic estimates. Overall, the high-resolution topography and precise chronology at the same site makes it possible to reveal the geomorphic complexities of terrace riser offsets and post-depositional evolution, and to show how previous geological rates along the fault were both under-and overestimated .

Domaines

Tectonique
Fichier principal
Vignette du fichier
Shaoetal_GSAB_2020-accepted.pdf (3.15 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03012211 , version 1 (27-11-2020)

Identifiants

Citer

Yanxiu Shao, Jing Liu-Zeng, Jérôme van Der Woerd, Yann Klinger, Michael Oskin, et al.. Late Pleistocene slip rate of the central Haiyuan fault constrained from OSL, 14C, and cosmogenic isotope dating and high-resolution topography. Geological Society of America Bulletin, 2020, ⟨10.1130/B35571.1⟩. ⟨hal-03012211⟩
81 Consultations
130 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More