COLLABORATIVE RESEARCH: Morphology, Geochemistry, and Stable Isotope Compositions of Vertic Paleosols as Indicators of Paleozoic Paleoclimate

合作研究：垂直古土壤的形态、地球化学和稳定同位素组成作为古生代古气候的指标

• 批准号: 9206540
• 负责人: Claudia Mora
• 金额: $ 9.95万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9206540&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Morphology; Geochemistry; Stable

This is a collaborative research between C.I. Mora and S.G. Driese (University of Tennessee; lead institution) and D.E. Fastovsky (University of Rhode Island) to support ongoing research on aspects of Paleozoic paleoclimates that are reflected in vertic-featured paleosols preserved in the central and southern Appalachian sedimentary sequence. The study takes advantage of the wide spatial and temporal distribution and climatic-dependency of these paleosols, as well as their amenability to stable isotopic analysis. Morphology, geochemistry, and stable isotopic compositions of the vertic paleosols form the database of the study. Vertic-featured paleosols are exposed in six states, representing fluvial and marginal-marine environments from the Ordovician through the Permian. Because vertic paleosols are, by comparison with other paleosol type, diagnostic of specific climatic variables such as annual wet/dry cyclicity and subtropical to tropical conditions, these paleosols are ideal subjects for the reconstruction of paleoclimatic variables. Moreover, the common occurrence of pedogenic carbonate permits the estimation of annual rainfall (based upon nodular horizon depth), as well as the opportunity to estimate Paleozoic atmospheric pCO2 and to tests of models of global atmospheric CO2 concentrations throughout most of the Paleozoic Era.

这是C.I.之间的合作研究Mora和S.G. Driese（田纳西大学；领导机构）和D.E. Fastovsky（罗德岛大学）支持对古生代古生物的各个方面进行的研究，这些研究反映在阿巴拉契亚中部和南部的阿巴拉契亚沉积序列中保存的vertic式古溶胶中。 该研究利用了这些古溶胶的广泛空间和时间分布以及气候依赖性，以及它们对稳定的同位素分析的不合适性。 Vertic古溶胶的形态，地球化学和稳定的同位素组成形成了研究的数据库。 在六个州暴露了vertic式的古质，代表了来自二叠纪的河流和边缘海洋环境。 由于与其他古溶胶类型相比，由于角膜质溶解是对特定气候变量的诊断，例如每年的湿/干循环性以及对热带条件的亚热带，因此这些古溶胶是重建古气候变量的理想受试者。 此外，花梗碳酸盐的常见发生允许估计年降雨量（基于结节范围的深度），以及在整个古生物学时代的整个大部分时代的全球大气二氧化碳浓度模型进行估算的机会。