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

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

中国地质大学地球科学学院湖北武汉 430074

基金项目:

国土资源部国际合作与科技司项目 00012007

详细信息

作者简介:
王红梅(1970), 女, 讲师, 1997年毕业于中国地质大学(武汉), 获矿床学硕士学位, 现主要从事有机地球化学和地质微生物的教学和科研工作

中图分类号: P53
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出版历程
- 收稿日期: 2000-12-13
- 刊出日期: 2001-05-25

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

摘要

摘要: 利用气相色谱-质谱仪从四川剑门关侏罗—白垩系红层中检测出包括正构烷烃、类异戊二烯烃、长链三环萜、藿烷及甾烷等系列分子化石.分析了这些分子化石的分布特征及其来源, 利用分子化石的多项参数(如w (C₂₁^-)/w (C₂₂⁺), w (Pr) /w(Ph), w(Pr)/w(nC17), w(Ph)/w (nC₁₈), 伽马蜡烷指数、甾烷等) 对沉积环境的盐度、氧化-还原条件、陆相标志等方面作了探讨.这些分子化石参数证实在中侏罗世—早白垩世, 剑门关一带的沉积环境应为低盐度淡水、弱氧化的陆相沉积环境.所研究的陆相样品高碳数正构烷烃均以与木本植物有关的C₂₇, C₂₉为主峰, 未出现草本植物的C₃₁主峰, 反映了研究区总体格局是一种以木本植物占绝对优势、温暖湿润的气候环境, 与红盆发育的气候条件吻合, 充分体现了分子化石在恢复古环境、古植被和古气候方面有极大潜力
- 分子化石 /
- 红层 /
- 古环境 /
- 古植被 /
- 古气候 /
- 剑门关
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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图 1 剑门关剖面样品C₂₇ ,C₂₈ ,C₂₉规则甾烷三角图

Fig. 1. Distribution of regular steranes

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图 2 剑门关红色盆地分子化石指标分布

Fig. 2. Distributions of molecular fossil parameters from red strata of Jianmenguan, Sichuan basin

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表 1 剑门关剖面样品分子化石参数

Table 1. Parameters of molecular fossils on Jianmenguan profile

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