Oxygen and Carbon Stable Isotope Composition of Cretaceous to Pliocene Calcareous Paleosols in the Tian Shan Region (Central Asia): Controlling Factors and Paleogeographic Implications - Archive ouverte HAL Access content directly
Journal Articles Geosciences Year : 2018

Oxygen and Carbon Stable Isotope Composition of Cretaceous to Pliocene Calcareous Paleosols in the Tian Shan Region (Central Asia): Controlling Factors and Paleogeographic Implications

(1) , (1) , (2) , (1) , (3) , (1) , (1) , (4) , (5) , (6)
1
2
3
4
5
6
Marc Jolivet
Connectez-vous pour contacter l'auteur
Philippe Boulvais
  • Function : Author
  • PersonId : 840705
Laurie Barrier
  • Function : Author
  • PersonId : 882773
Cécile Robin
  • Function : Author
  • PersonId : 836508
Gloria Heilbronn
  • Function : Author
  • PersonId : 768250
  • IdRef : 184668670
Julie Ledoyen
  • Function : Author
  • PersonId : 1036135
Quentin Ventroux
  • Function : Author
  • PersonId : 1036136

Abstract

The Late Mesozoic–Cenozoic topographic and climate evolution of Central Asia remains highly debated. The final retreat of the proto-Paratethys Sea from the western Tarim Basin is thought to correspond in time with the onset of tectonic uplift in the Pamir, Tian Shan and Altai ranges, as well as with regional aridification. The oxygen and carbon isotope compositions of the sediment deposits in the various Central Asian basins have already been used to decipher both the topographic and climatic changes that occurred in that region during the Cenozoic, generally concentrating on one sedimentary section and/or on a limited time range and either using multiple-type samples including sandstone calcitic cements, marine carbonates, fossils, or paleosols. In order to get a homogeneous dataset, minimizing variations in the isotopic composition of the material depending on its type and/or depositional environment, we selected only calcareous paleosols sampled in several continuous sections covering a wide time range from the Late Jurassic to the Pliocene. Our sampling also covers a wide area encompassing the whole Tian Shan region, which allows detecting regional variations in the δ 18 O and δ 13 C values. We show that the influence of the distance to the proto-Paratethys Sea on the paleosol δ 18 O record was not significant. Besides local factors such as the occurrence of large lakes that can have a significant effect on the isotopic composition of the calcareous paleosols, the long-term evolution of both the δ 18 O and δ 13 C values possibly reflects the hypsometry of the river drainage systems that bring water to the basins. However, as it is commonly accepted that the δ 18 O of soil carbonates is controlled by the δ 18 O of in-situ precipitation, this last conclusion remains to be further investigated.
Fichier principal
Vignette du fichier
jolivet-geosciences-2018.pdf (3.94 Mo) Télécharger le fichier
Origin : Publication funded by an institution
Loading...

Dates and versions

insu-01866759 , version 1 (03-09-2018)

Identifiers

Cite

Marc Jolivet, Philippe Boulvais, Laurie Barrier, Cécile Robin, Gloria Heilbronn, et al.. Oxygen and Carbon Stable Isotope Composition of Cretaceous to Pliocene Calcareous Paleosols in the Tian Shan Region (Central Asia): Controlling Factors and Paleogeographic Implications. Geosciences, 2018, 8 (9), pp.330. ⟨10.3390/geosciences8090330⟩. ⟨insu-01866759⟩
112 View
118 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More