NEOGENE PALYNOLOGICAL ASSEMBLAGES FROM QIONGDONGNAN BASIN AND THEIR PALEOCLIMATIC IMPLICATIONS

ZHANG Yifan; LIU Dongsheng; ZHANG Xunhua

doi:10.16562/j.cnki.0256-1492.2017.01.011

2017 Vol. 37, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2017 > 37(1): 93-101

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ZHANG Yifan, LIU Dongsheng, ZHANG Xunhua. NEOGENE PALYNOLOGICAL ASSEMBLAGES FROM QIONGDONGNAN BASIN AND THEIR PALEOCLIMATIC IMPLICATIONS[J]. Marine Geology & Quaternary Geology, 2017, 37(1): 93-101. doi: 10.16562/j.cnki.0256-1492.2017.01.011

Citation:

ZHANG Yifan, LIU Dongsheng, ZHANG Xunhua. NEOGENE PALYNOLOGICAL ASSEMBLAGES FROM QIONGDONGNAN BASIN AND THEIR PALEOCLIMATIC IMPLICATIONS[J]. Marine Geology & Quaternary Geology, 2017, 37(1): 93-101. doi: 10.16562/j.cnki.0256-1492.2017.01.011

NEOGENE PALYNOLOGICAL ASSEMBLAGES FROM QIONGDONGNAN BASIN AND THEIR PALEOCLIMATIC IMPLICATIONS

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Qingdao Institute of Marine Geology, Qingdao 266071, China

Received Date: 16 May 2016

Revised Date: 25 July 2016

Publish Date: 28 February 2017

Abstract

Abstract

Palynological research plays a significant role in exploration for petroliferous basins. It provides not only evidence for stratigraphic classification, but also information on paleovegetation and paleoclimate. With the palynological assemblages of the Well LS33 from the deepwater area of the Qiongdongnan Basin, this paper discussed the paleovegetation types and paleoclimatic characteristics of the basin since Oligocene. Eight palynological assemblages are identified and variations in assemblages recognized. The Early Oligocene pollen assemblages is dominated by ferns, accompanied by evergreens, with little cool and dry species, representing a tropical or subtropical warm and humid climate. The Late Oligocene to Early Miocene assemblages inherited the warm and humid weather in Early Oligocene. Quercoidites and Momipites are most abundant, with more apparent vertical zonations in both vegetation and climate. However, a stunning change occurred in Early Miocene. An increasing in pollen assemblage of temperate deciduous forest and alpine coniferous forest suggests the climate conditions that changed dramatically to cool and dry. Evergreens and Mangrove were abundant in Early Miocene to Late Miocene, and the climate was warm and humid then. Since Late Miocene, mangrove gradually reduced while herbs increased, which illustrated a conversion from the warm and humid weather to the cool and dry again.
- palynological assemblages /
- paleoclimate /
- Neogene /
- Qiongdongnan Basin

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References

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