The Triassic to Early Jurassic palynological record of the Tarim Basin, China

The Tarim Basin, located in northwestern China, is an important oil-bearing region, and the extensive non-marine Mesozoic successions make this a key location for understanding environmental changes through the Triassic and Jurassic. Palynological analyses on samples from Lunnan-1 and Tazhong-1 dril...

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Bibliographic Details
Published in:Palaeobiodiversity and Palaeoenvironments
Main Authors: Peng, Jungang, Li, Jianguo, Li, Wenben, Slater, Sam M., Zhu, Huaicheng, Vajda, Vivi
Format: Report
Language:English
Published: SPRINGER HEIDELBERG 2018
Subjects:
Phytogeography
Palaeovegetation
Biostratigraphy
Spores and pollen
Triassic and Jurassic
Tarim Basin
PERMIAN MASS-EXTINCTION
NW CHINA
TRIASSIC/JURASSIC BOUNDARY
NORTHWESTERN CHINA
EAST GREENLAND
CLIMATE-CHANGE
JUNGGAR BASIN
VEGETATION
RECOVERY
POLLEN
Biodiversity & Conservation
Paleontology
Biodiversity Conservation
Greenland
East Greenland
Online Access:http://ir.nigpas.ac.cn/handle/332004/17795
https://doi.org/10.1007/s12549-017-0279-y
Description
Summary:The Tarim Basin, located in northwestern China, is an important oil-bearing region, and the extensive non-marine Mesozoic successions make this a key location for understanding environmental changes through the Triassic and Jurassic. Palynological analyses on samples from Lunnan-1 and Tazhong-1 drill cores from the northern and central part of the Tarim Basin reveal well-preserved spore-pollen assemblages. Five palynological assemblages, i.e. Tarim Triassic 1 (TT1)-Tarim Triassic 4 (TT4) and Tarim Jurassic 1 (TJ1), spanning the Early Triassic to Early Jurassic were identified based on compositional changes, which are supported by ordination of samples using non-metric multidimensional scaling (NMDS). The Early Triassic assemblages possess abundant bryophytes and Densoisporites spp.-producers, which potentially represent a recovery succession following the end-Permian event. The Late Triassic spore-pollen assemblages are more similar to those of the North China Palynofloral Province compared to the South China Province. Based on our phytogeographic analysis, we propose that the western section of the boundary between the North and South China palynofloras should be placed at the southern margin of the Tarim Basin.

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