四川剑门关侏罗——白垩系红层分子化石的古环境和古气候意义

王红梅; 刘育燕; 王志远

Volume 26 Issue 3

May 2001

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Article Navigation > Earth Science > 2001 > 26(3): 229-234

WANG Hong-mei, LIU Yu-yan, WANG Zhi-yuan, 2001. MOLECULAR FOSSILS AS INDICATORS FOR PALEOENVIRONMENT AND PALEO-CLIMATE FROM RED CLASTIC ROCKS OF MIDDLE JURASSIC-EARLY CRETACEOUS IN JIANMENGUAN, SICHUAN BASIN OF CHINA. Earth Science, 26(3): 229-234.

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MOLECULAR FOSSILS AS INDICATORS FOR PALEOENVIRONMENT AND PALEO-CLIMATE FROM RED CLASTIC ROCKS OF MIDDLE JURASSIC-EARLY CRETACEOUS IN JIANMENGUAN, SICHUAN BASIN OF CHINA

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2000-12-13
Publish Date: 2001-05-25

Abstract

Abstract

Series of molecular fossils, including n-alkanes, extended tricyclic terpanes, hopanes and regular steranes, have been detected from the red clastic strata of Middle Jurassic-Early Cretaceous in Jianmenguan profile, Sichuan basin in China. These molecular fossils are supposed to be derived from higher plants and aquatic organisms. Their parameters such as low gammaceran abundance, relative higher w (Pr) / w (Ph) and the dominance of C₂₇-ethylcholestane suggest the occurrence of a limnetic, non reductive continental environment in the study area during Middle Jurassic and Early Cretaceous. C₂₇ and C₂₉ n-alkanes, believed to be related to woody plants, constitute the main high carbon number n-alkanes in the studied samples, while C₃₁ n-alkane, supposed to be the main n-alkane in herbal plants, does not prevail over C₂₇ and/or C₂₉ n-alkanes in the samples. This suggests the flourishing of woody plants other than grassy plants at that geological time. This kind of vegetation further indicates the existence of a warm and humid climate from Middle Jurassic-Early Cretaceous, a kind of climate favorable for the development of the red basin. This investigation of the red sedimentary rocks shows that the molecular fossils have a high potential in recovering the paleoenvironment, paleo-vegetation and palaeo climate.
- molecular fossils,
- red strata,
- paleoenvironment,
- paleo-vegetation,
- paleo-climate,
- Jianmenguan

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References(21)

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