The discovery of Paleogene insect fossils in eastern Nima Basin, Tibet, and its implication for paleoclimate

ZENG Shengqiang; CHEN Wenbin; FU Xiugen; LIU Junhao; LI Jinfeng; QIU Jilong

2020 Vol. 39, No. 7

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ZENG Shengqiang, CHEN Wenbin, FU Xiugen, LIU Junhao, LI Jinfeng, QIU Jilong. The discovery of Paleogene insect fossils in eastern Nima Basin, Tibet, and its implication for paleoclimate[J]. Geological Bulletin of China, 2020, 39(7): 1121-1124.

Citation:

ZENG Shengqiang, CHEN Wenbin, FU Xiugen, LIU Junhao, LI Jinfeng, QIU Jilong. The discovery of Paleogene insect fossils in eastern Nima Basin, Tibet, and its implication for paleoclimate[J]. Geological Bulletin of China, 2020, 39(7): 1121-1124.

The discovery of Paleogene insect fossils in eastern Nima Basin, Tibet, and its implication for paleoclimate

1.
Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China
2.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China
3.
Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Natural Resources, Chengdu 610081, Sichuan, China
4.
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China
5.
280 Institute of Nuclear Industry, Guanghan 618300, Sichuan, China

Received Date: 14 November 2019

Revised Date: 15 June 2020

Publish Date: 25 July 2020

Abstract

Abstract

Since the Cretaceous period, thick terrigenous clastic rocks interbedded with limestone strata have been deposited in the Nima Basin, northern Tibet, but the deposition age is still debatable due to the lack of fossil evidence.Recently, a lot of insect, fish and plant fossils were discovered from the fine clastic rocks interbedded with limestone strata in the Saibu Co area in the east of the Nima Basin.The insect fossils mainly consist of Aquarius lunpolaensis, which is consistent with the morphological characteristics of the species reported in the Dayu area in the Lunpola Basin and the Jiangnongtangga area in the west of Nima Basin, indicating that this set of strata was Late Oligocene Dingqinghu Formation rather than the Jingzhushan Formation or Niubao Formation.In addition, Aquarius lunpolaensis mainly existed in warm and humid environment at low elevation area and, in combination with tropical to subtropical fish and plant fossil assemblage in the Late Oligocene strata in the Lunpola and Nima basins of central Tibet found in recent years, the authors argue for a warm and humid lowlands environment in the Late Oligocene period in the central Tibet rather than high and cold climate as used to be considered.
- insect fossil /
- Late Oligocene /
- Dingqinghu Formation /
- Nima Basin

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References

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