摘要
西藏南部晚白垩世红色灰岩层为大洋富氧条件下的沉积产物，红色灰岩层内有机碳极低，生物极其繁盛，碳同位素偏低，但从上往下又呈增高趋势。溶解氧含量在古海洋演化史中是非线形波动变化的，既有全球溶解氧含量偏低时期（缺氧条件），也有全球溶解氧含量偏高时期（富氧条件），古海洋溶解氧含量重建和富氧问题的解决对于理解大洋循环、古气候、生命绝灭。
To reestablish paleo dissolved oxygen will benefit greatly to understand paleo ocean current,paleo climate,bio events and organic evolution.This paper discusses dissolved oxygen distribution,its influence factors and study ways of paleo ocean oxygen,such as bioturbation,sulfur isotope,trace element and paleo ecology.A series of special 20～120m thick marine red beds have been discovered in southern Tibet.The Upper Cretaceous red beds,which formed in deep water basins,are sedimentary products of a sort of high oxic conditions.This conclusion is supported by low organic carbon,relatively high S/C ratio,and low carbon isotope values.Furthermore,we make an inference that the high oxic conditions of deep intermediate water are prevailing in Upper Cretaceous(Santonian to Campanian).
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1999年第3期39-47,共9页
Marine Geology & Quaternary Geology
基金
国家杰出青年科学基金
关键词
古海洋学
溶解氧
富氧环境
缺氧事件
西藏南部
paleo oceanography
dissolved oxygen
high oxic environment
anoxic events
southern Tibet
