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Orbital Forcing and Sea-Level Changes in the Earliest Triassic of the Meishan Section,South China

Journal of Earth Science 2014年第1期25卷 64-73页

作者： Shifeng Tian Zhong-Qiang Chen Chunju Huang Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Faculty of Earth Resources China University of Geosciences State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Faculty of Earth Sciences China University of Geosciences

The Earliest Triassic Yinkeng Formation is exposed at the well-known Meishan Section, South China, which contains the Global Stratotype of Section and Point （GSSP） for the Permian- Triassic boundary （PTB）. It records centimeter-scale rhythmic alternations comprised mainly by marl- stone and limestone. Seven types of couplet embedded in five types of bundles were recognized based on occurrence and thickness of the lithologic units, suggesting that their formation was controlled by cyclic processes. The various orders of cycles observed correlate well with other Early Triassic counterparts recorded in South China. Here, we present new cyclostratigraphic results based on lithologic thickness and relative carbonate content of the Yinkeng Formation. Power spectra of carbonate content show that the ratio of major wavelengths recognized throughout the formation is similar to that of the 100 kyr short eccentricity, 33 kyr obliquity, and 21 kyr precession cycles, indicating that astronomical sig- nals are recorded in the Earliest Triassic rhythmic succession. Consistence between pronounced lithologic rhythmicity and sea-level changes obtained from Fischer plots indicates that high-frequency climatic cycles may have driven sea-level changes immediately after the PTB mass extinction. Fur- thermore, the 4th-order sea-level changes interpreted from the sedimentary record match well with 100 kyr short eccentricity component of carbonate content, reflecting that the 100 kyr short eccentricity- induced climate changes may have likely controlled the deposition of 4th-order sequences recognized from rhythmic successions.

关键词： orbital cycle limestone-marl alternation carbonate content Fischer plot Yinkeng Formation.

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PALEOCLIMATIC CHANGES IN DABUSU LAKE

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Chinese Journal of Oceanology and Limnology 2001年第1期19卷 91-96页

作者：沈吉曹建廷吴艳宏 RyoMatsumoto 孙庆义 NanjingInstituteofGeographyandLimnology ChineseAcadanyofSciencesNanjing210008China GeologicalInstitute UnitaryofTokyoTokyo113Japan JCommitteeofManagingofManagingWaterResowres ShandongPrtniruceJining272192China

Study on the carbonate content and oxygen isotope of a sediment section in Dabusu Lake revealed that this region has experienced several cold wet and warm dry climatic cycles since 15400 a BP. It was about 6740 a BP when the climate in the region reached a relatively stable warm stage, so that the lake water was gradually condensed and finally a saline lake was formed.

关键词： carbonate content oxygen isotope paleoclimate Dabusu Lake

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