Early Cretaceous spore-pollen assemblages from the Shahezi Formation in Well SK-2 and their paleoclimate significance

ZHANG Dejun; ZHENG Yuejuan; ZHANG Shuqin; ZHANG Jian; HUANG Xin; CHEN Shuwang; SUN Lei

doi:10.12097/gbc.2021.09.018

2024 Vol. 43, No. 2~3

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Article navigation > Geological Bulletin of China > 2024 > 43(2~3): 429-442

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ZHANG Dejun, ZHENG Yuejuan, ZHANG Shuqin, ZHANG Jian, HUANG Xin, CHEN Shuwang, SUN Lei. 2024. Early Cretaceous spore-pollen assemblages from the Shahezi Formation in Well SK-2 and their paleoclimate significance. Geological Bulletin of China, 43(2~3): 429-442. doi: 10.12097/gbc.2021.09.018

Citation:

ZHANG Dejun, ZHENG Yuejuan, ZHANG Shuqin, ZHANG Jian, HUANG Xin, CHEN Shuwang, SUN Lei. 2024. Early Cretaceous spore-pollen assemblages from the Shahezi Formation in Well SK-2 and their paleoclimate significance. Geological Bulletin of China, 43(2~3): 429-442. doi: 10.12097/gbc.2021.09.018

Early Cretaceous spore-pollen assemblages from the Shahezi Formation in Well SK-2 and their paleoclimate significance

1.
Shenyang Center, China Geological Survey, Shenyang 110034, Liaoning, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Research Centre of Palaeontology and Stratigraphy, Jilin University, Changchun 130026, Jilin, China

More Information

Corresponding author: ZHENG Yuejuan, 1152746127@qq.com

Received Date: 18 September 2021

Revised Date: 15 April 2022

Publish Date: 15 March 2024

Abstract

Abstract

Well SK-2 is located in the Anda City of Heilongjiang Province, China. A total of 4134.8 m continuous core in Well SK-2 provides a unique chance to study the Lower Cretaceous in the Songliao basin, being an important part in the continental scientific drilling program. Based on the distribution of pollen and spores in the Well SK-2, two assemblages are established for the upper part of the Shahezi Formation. They are named as Leiotriletes sp.−Cyathidites australis−Chasmatosporites sp. assemblage (at the depth of 3832.94~3901.35 m) and Klukisporites triangulus−Aequitriradites sp.−Pristinuspollenites sp. assemblage (at the depth of 3395.46~3493.24 m). The geological age of the Shahezi Formation is assigned to Hauterivian – Early Barremian (Early Cretaceous) according to the characteristics of the assemblages. The reconstructed vegetation changes from coniferous forest and tussock to evergreen broad-leaf forest, to coniferous forest and tussock, and to coniferous and broad-leaved mixed forest during the time interval. The reconstructed climate changes from humid warm temperate to semi-humid south subtropical, to humid warm temperate, and to semi-humid temperate.
- Well SK-2 /
- Early Cretaceous /
- Shahezi Fomation /
- pollen and spore assemblage /
- paleoclimate /
- Songliao basin

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References

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