沉积学报2012，Vol.30Issue(5)：806-816,11.
贵州新民剖面晚二叠世碳同位素变化特征及有机碳埋藏的意义
Variations of Carbon Isotope Carbon Burial in the Late Permian and the Significance of Organic at Xinmin Section, Guizhou Province
摘要
Abstract
The fraction of organic carbon burial (forg) is calculated on the basis of the carbon cycle model with the re- cords of carbon isotope composition on both carbonate and organic matter in the late Permian at Xinmin section, and the abundance of acritachs, algae and microbes which represents marine primary paleo-productivity is examined. We discuss the relationship among fors, marine paleo-productivity and the content of residual TOC in details. Residual TOC is determined by the combinations of the primary productivity, organic carbon burial fraction (fors) and burial redox conditions. But the data in Xinmin section and Meishan section show that the paleo-productivity plays a domi- nant role on the value of residual TOC. But this conclusion still needs further proof: we found that fo~s is mainly con- trolled by 813Coarb by Kump' s model, in which it concluded increased volcanism leads to only small changes in ~13 Ccarb, and set the carbon isotope value of volcanic activity and weathering as ~w = -5%o. That is to say, a series of secondary environmental effects caused by volcanism were ignored, such as " volcanic winter", ocean acidification, smoke and other toxic substances and so on, all of which had great impact on the marine environment. However, large-sized volcanism in the Late Permian could result in serious perturbation to marine carbon cycle. Therefore, the model still need to be further improved on calculating organic carbon burial fraction quantitatively or semi-quantitative- ly during this special geological period.关键词
碳同位素/有机碳埋藏分数/疑源类、藻类和菌孢/晚二叠世Key words
carbon isotope/fraction of organic carbon burial/acritachs, algae and microbes/late Permian分类
天文与地球科学引用本文复制引用
胡庆,沈俊,冯庆来..贵州新民剖面晚二叠世碳同位素变化特征及有机碳埋藏的意义[J].沉积学报,2012,30(5):806-816,11.基金项目
国家自然科学基金项目（批准号：40839903和40921062）资助. （）
