Quantitative Study of the Early Cretaceous Paleoclimate in Beishan Area, Gansu Province: Based on C-O Isotope Analysis of Reptiles

WANG Qian; SHEN Huan; WEI Zheng'an; LI Yubai; ZHANG Zhifeng

doi:10.12401/j.nwg.2024071

Northwestern Geology > 2024 > 57(6): 136-149. > DOI: 10.12401/j.nwg.2024071

WANG Qian，SHEN Huan，WEI Zheng'an，et al. Quantitative Study of the Early Cretaceous Paleoclimate in Beishan Area, Gansu Province: Based on C-O Isotope Analysis of Reptiles[J]. Northwestern Geology，2024，57（6）：136−149. doi: 10.12401/j.nwg.2024071

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Quantitative Study of the Early Cretaceous Paleoclimate in Beishan Area, Gansu Province: Based on C-O Isotope Analysis of Reptiles

1.
Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Department of Earth System Science, Tsinghua University, Beijing 100084, China
3.
Institute for Advanced Study, Shenzhen University, Shenzhen 518060, Guangdong, China
4.
School of GeologicalEngineering and Geomatics, Chang'an University, Xi'an 710064, Shaanxi, China
5.
School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China

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Received Date: November 07, 2022
Revised Date: July 24, 2024
Accepted Date: July 28, 2024
Available Online: October 09, 2024

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Abstract

Abstract

In order to quantitatively study important paleoclimatic indicators such as paleotemperature and precipitation of early Cretaceous in Beishan area, Gansu Province, effective samples of dinosaurs' teeth, crocodiles' teeth and turtles' carapace were collected from the Lower Cretaceous in the Beishan area of the northeastern margin of the Jiuquan Basin. Bioapatite was extracted from tooth enamel and tortoiseshell samples by chemical experiments, the δ¹⁸O_P(‰, V-SMOW) of phosphate and the δ¹³C_C(‰, V-PDB) in apatite have been extracted and measured. The δ¹⁸O_P(‰, V-SMOW) of Iguanodon tooth enamel is between 14.627‰～22.137‰, the average value is 17.634‰; The δ¹⁸O_P(‰, V-SMOW) of ceratopsia tooth enamel is between 15.532‰～22.668‰, the average value is 18.225‰; The δ¹⁸O_P(‰, V-SMOW) of theropod tooth enamel is between 16.915‰～20.763‰, the average value is 18.925‰; The δ¹⁸O_P(‰, V-SMOW) of crocodiles' tooth enamel is 16.619‰; The δ¹⁸O_P(‰, V-SMOW) of turtles' carapace is between 15.106‰～16.627‰, the average value is 16.061‰. The δ¹³C_c(‰, V-PDB) of Iguanodon tooth enamel is between −6.477‰～−1.852‰, the average value is −5.274‰. The δ¹³C_c(‰, V-PDB) of ceratopsia tooth enamel is between −5.609‰～−2.495‰, the average value is −4.051‰. Based on oxygen isotope data, the annual average paleotemperature is calculated to be (19±3)℃, Based on carbon isotope data, the annual average precipitation is calculated to be (605 ± 151)mm/y, which indicates that the early Cretaceous in Jiuquan area had a warm temperate subtropical dry forest climate, mainly semi-arid to arid environment.
- Beishan area,
- early Cretaceous,
- paleoclimate,
- carbon and oxygen isotope,
- bioapatite

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Quantitative Study of the Early Cretaceous Paleoclimate in Beishan Area, Gansu Province: Based on C-O Isotope Analysis of Reptiles

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Quantitative Study of the Early Cretaceous Paleoclimate in Beishan Area, Gansu Province: Based on C-O Isotope Analysis of Reptiles

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