Cretaceous Oceanic Redbeds: Implications for Paleoclimatology and Paleoceanography  

作　　者：WANGChengshan HUANGYongjian HUXiumian LIXianghui 

机构地区：[1]StateKeyLaboratoryofOil／GasReservoirGeologyandExploration,ChengduUniversityofTechnology,Chengdu,Sichuan610059 [2]DepartmentofEarthScience,NanjingUniversity,Nanjing,Jiangsu210096

出　　处：《Acta Geologica Sinica(English Edition)》2004年第3期873-877,共5页地质学报（英文版）

基　　金：The research is jointly supported by the Key Project of the National Natural Science Foundation of China(No.40332020);Prophase Special Research of Vital Projects in the Basic Research of the Ministry of Science and Technology of China(No.2001CCA01 800);International Geological Correlation Program(IGCP463/494).

摘　　要：The Cretaceous is among the most unusual eras in the geological past. Geoscience communities have been having great concerns with geological phenomena within this period, for example carbonate platforms and black shales in the Early and Middle Cretaceous respectively, during the last decades. But few people have paid any attention to the set of pelagic redbeds lying on the black shales, not to mention the applications to paleoclimatology and paleoceanography. It is shown by the sedimentary records of redbeds, that they were deposited around the CCD, with both a higher content of iron and much lower concentrations of organic carbon, which implies conditions with a relatively high content of oxygen. Such redbeds occurred in the global oceans, mainly in the Tethyan realm, with different durations of deposition and a climax from the late Santonian to early Campanian. Global cooling and dramatic changes in ocean currents might help to increase the oxygen flux between the atmosphere and ocean, after the large scale organic carbon burial during the Middle Cretaceous, and therefore lead to the oxygenation of deep ocean and so the occurrence of late Cretaceous oceanic redbeds.The Cretaceous is among the most unusual eras in the geological past. Geoscience communities have been having great concerns with geological phenomena within this period, for example carbonate platforms and black shales in the Early and Middle Cretaceous respectively, during the last decades. But few people have paid any attention to the set of pelagic redbeds lying on the black shales, not to mention the applications to paleoclimatology and paleoceanography. It is shown by the sedimentary records of redbeds, that they were deposited around the CCD, with both a higher content of iron and much lower concentrations of organic carbon, which implies conditions with a relatively high content of oxygen. Such redbeds occurred in the global oceans, mainly in the Tethyan realm, with different durations of deposition and a climax from the late Santonian to early Campanian. Global cooling and dramatic changes in ocean currents might help to increase the oxygen flux between the atmosphere and ocean, after the large scale organic carbon burial during the Middle Cretaceous, and therefore lead to the oxygenation of deep ocean and so the occurrence of late Cretaceous oceanic redbeds.

关 键 词：CRETACEOUS oceanic redbeds PALEOCLIMATE PALEOCEANOGRAPHY 

分 类 号：P736.222[天文地球—海洋地质] P736.224[天文地球—海洋科学]