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在对扬子地台贵州瓮安陡山沱组剖面干酪根碳同位素组成进行分析后发现其变化显示了一定的规律性。碳同位素规律变化反映了最初的沉积信息,特别是有机质埋藏量的变化。获得的陡山沱期沉积岩中碳同位素组成研究结果初步反映了震旦-寒武交变期沉积环境的面貌;碳同位素组成变化规律可以用于反映扬子地台沉积层序和世界同期地层全球碳循环的对比和参考。为扬子区陡山沱期环境变化和生物演化提供了证据。δ13Cker值在-32.3‰和-24.5‰(PDB)间漂移与δ13Ccarb值在-4.9‰和3.6‰(PDB)间的变化,反映了当时海水的碳同位素组成。无机和有机碳同位素组成之差的Δδorg-carb值沿剖面不断变化,是由于沉积有机质中有促进发酵功能的细菌数量比例变化所致。
After analyzing the carbon isotopic composition of kerogen in the Doushantuo Formation of the Weng’an, Yangtze Delta, it was found that the variation of kerogen showed a certain regularity. Changes in the laws of carbon isotope reflect the initial sedimentary information, especially changes in the amount of organic matter buried. The results of the carbon isotope composition analysis of the sedimentary rocks in the Doushantuo Period initially reflect the appearance of the sedimentary environment in the Sinian-Cambrian alternating phase. The variation law of carbon isotopic composition can be used to reflect the sedimentary sequence of the Yangtze platform and the global carbon Cycle comparison and reference. It provided evidence for the environmental changes and biological evolution in the Doushantuo period of Yangtze region. The change of δ13Cker between -32.3 ‰ and -24.5 ‰ (PDB) and the change of δ13Ccarb between -4.9 ‰ and 3.6 ‰ (PDB) reflect the carbon isotopic composition of seawater at that time. The δδδδδ-carb value, which is the difference between the inorganic and organic carbon isotopic compositions, varies along the profile due to the change in the proportion of bacteria that promote the fermentation in sedimentary organic matter.