陇东地区延长组疑源类组合特征及其古环境意义

吉利明; 王少飞; 徐金鲤

Volume 31 Issue 6

Jun. 2006

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JI Li-ming, WANG Shao-fei, XU Jin-li, 2006. Acritarch Assemblage in Yanchang Formation in Eastern Gansu Province and Its Environmental Implications. Earth Science, 31(6): 798-806.

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JI Li-ming, WANG Shao-fei, XU Jin-li, 2006. Acritarch Assemblage in Yanchang Formation in Eastern Gansu Province and Its Environmental Implications. Earth Science, 31(6): 798-806.

JI Li-ming, WANG Shao-fei, XU Jin-li, 2006. Acritarch Assemblage in Yanchang Formation in Eastern Gansu Province and Its Environmental Implications. Earth Science, 31(6): 798-806.

Citation:

JI Li-ming, WANG Shao-fei, XU Jin-li, 2006. Acritarch Assemblage in Yanchang Formation in Eastern Gansu Province and Its Environmental Implications. Earth Science, 31(6): 798-806.

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Acritarch Assemblage in Yanchang Formation in Eastern Gansu Province and Its Environmental Implications

1.
Lanzhou Research Center for Oil and Gas Resource, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
2.
Graduate School, China University of Geosciences, Wuhan 430074, China
3.
Research Institute of Exploration and Development of Changqing Oizfield Branch, Xi'an 710021, China
4.
Geological Sciences Research Institute of Shengli Oilfield, Dongying 257015, China

Received Date: 2006-04-28
Publish Date: 2006-11-25

Abstract

Abstract

In this paper, the microfossil assemblage from drilling core samples of Xifeng oilfield is discussed with palynologic analystic method, to clarify terrestrial sediment environment of Yanchang Formation in Ordos basin during the Middle and Late Triassic. The research shows abundant acritarchs in the main oil-source rocks, namely in Chang 7 Section of Yanchang Formation. All these acritarchs, highly abundant in fossils, but monotone in species, are dominated absolutely by Leiophaerids acritarchs Leiosphaeridia, often associated with acanthomorphic acritarchs Micrhystridium. The contrast in the ecological distribution and assemblage between contemporaneous acritarchs, especially acanthomorphic acritarchs, illustrates that the sedimentary surroundings were fresh lacustrine. These acritarchs, not only monotone in species but also conspicuous in echinulate process, suggest that some acanthomorphic marine acritarchs survived long-time evolution in fresh water. The sedimentary environment of Chang 7 Section, the main source rock in the area, turned into the climax of lake transgression, indicating the supply of the large-scale lake water body from rivers instead of from the rise in sea level. These evidences prove that the Early and Middle Triassic paralic and lacustrine features had already been inactive in the Middle and Late Triassic Ordos basin.
- Ordos basin,
- Triassic,
- Yanchang Formation,
- acritarch,
- paleoenvironment.

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Acritarch Assemblage in Yanchang Formation in Eastern Gansu Province and Its Environmental Implications

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