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题名: Hydrogen isotopic compositions of n-alkanes from terrestrial plants correlate with their ecological life forms
作者: Liu, Weiguo ; Yang, Hong ; Li, Liwu
刊名: CHINESE SCIENCE BULLETIN
出版日期: 2006
卷号: 150, 期号:2, 页码:330-338
关键词: hydrogen isotope ; leaf wax ; plant species
学科分类: Ecology
英文摘要: Xifeng (sic) oilfield was recently found in the southwest of the Ordos basin. The oil source rocks are the Chang 7 Section of Yanchang (sic) Formation. In order to study the paleoclimate that controlled the formation of source rocks, a systemically palynological research on related beds in Yanchang Formation has been carried out. The core samples were analyzed with classical palynological techniques and the organic-walled sporomorphs from these samples were observed, identified and photographed under a light microscopy and a fluorescence microscopy. Abundant sporopollen were found in drilling cores from Chang 8 and Chang 7 sections, and two assemblages were distinguished: the Aratisporites-Punctatisporites assemblage and the Asseretospora-Walchiites assemblage. Their characteristics are similar to those or the assemblage of Tongchuan (sic) Formation and the assemblage of Yanchang Formation in southeast Ordos basin, respectively. Their geological times are Ladinian of late Middle Triassic and Carnian of early Late Triassic, respectively. The correlation of palynoflora with their parent plants suggests the paleoclimate of eastern Gansu (sic) Province in the Middle and Late Triassic was warm and rainy with prosperous vegetation. The palynoflora indicated the area was in a temperate to subtropical zone then. Both the ecological types and differentiation degree curves of sporopollen indicated the period during Chang 8 and Chang 7 sections was warm and wet, and the phase accorded with large-scale lake transgression in Chang 8 Section and the largest lake area in Chang 7 Section. North China in Middle and Late Triassic was located in a warm and rainy, temperate and subtropical zone. The palynofloras in Chang 8 and Chang 7 sections have the characteristics of North China flora, however they also indicate wetter and warmer climate due to their proximity to the large lakes. The period of Chang 8 to Chang 7 sections is the climax of the expansion of the lake, and the bloom or fresh algae during the period, which helped form the high-quality source rocks in Chang 7 Section.
收录类别: SCI
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.lig.ac.cn/handle/132962/2120
Appears in Collections:油气地球化学研究室_期刊论文

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Liu, Weiguo; Yang, Hong; Li, Liwu.Hydrogen isotopic compositions of n-alkanes from terrestrial plants correlate with their ecological life forms,CHINESE SCIENCE BULLETIN,2006,150(2):330-338
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