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Palaeoecological Analysis of Paleogene Shahejie Formation in North Central Raoyang Sag of Central Hebei Depression(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第04期
Page:
358-363
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Palaeoecological Analysis of Paleogene Shahejie Formation in North Central Raoyang Sag of Central Hebei Depression
Author(s):
XI Zhu-gang1; GUO Jing-xing1; ZHAO Xiao-ying2
1. School of Geosciences, China University of Petroleum, Qingdao 266555, Shandong, China; 2. School of Foreign Languages, Anhui Science and Technology University, Fengyang 233100, Anhui, China
Keywords:
palaeoecology;  paleoclimate;  palynological assemblage;  Shahejie Formation;  Paleogene;  Raoyang Sag;  Central Hebei Depression
PACS:
Q913.8
DOI:
-
Abstract:
According to the identification of sporopollen fossils from the 42 wells in north central Raoyang Sag, Central Hebei Depression, the palaeoecological classification of palynoflora in Shahejie Formation was discussed; one palynological assemblage with high proportion of Quercoidites-Ulmipollenites was recognized, and five sub-assemblages were established, including Ephedripites-Ulmoideipites sub-assemblages, Pinaceae-Ephedripites-Podocarpidites sub-assemblages, Ephedripites-Pinaceae-Labitricolpites sub-assemblages, Pinaceae-Podocarpidites sub-assemblages and Piceaepollenites-Ephedripites-Cedripites sub-assemblages. Contrast to the palynological assemblage of offshore Shahejie Formation in Huanghua Depression, the palaeoecological change of Shahejie Formation in north central Raoyang Sag was discussed according to the different characteristics of palynological assemblage during various periods. The results showed that the proportion of mesic sporopollen was stable, with an average of 70% or higher, while there was a little change for the proportion of xerophilous and hygrophilous sporopollen; vegetation pattern during the late member 4 of Shahejie Formation was mainly evergreen and deciduous broad-leaved forest in semi-arid warm temperate climate; vegetation pattern during the member 3 of Shahejie Formation was mainly coniferous forest, and secondly broad-leaved forest in sub-humid sub-tropical climate; vegetation pattern during the member 2 of Shahejie Formation was mainly coniferous and broad-leaf forest in semi-arid sub-tropical climate; vegetation pattern during the member 1 of Shahejie Formation was mainly coniferous and broad-leaf forest with an increase of hygrophilous herbaceous vegetation in humid sub-tropical climate.

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Last Update: 2011-12-20