SGER: Biogeochemistry of Lipid Biomarkers in Modern and Fossil Bivalve Shells

SGER：现代和化石双壳贝壳中脂质生物标志物的生物地球化学

• 批准号: 9224586
• 负责人: Lisa Pratt
• 金额: $ 2.92万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-15 至 1994-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9224586&HistoricalAwards=false
• 关键词: SGER; Biogeochemistry; Lipid; Biomarkers; Modern

Analyses of light stable isotopes in bulk organic matter and major compound classes are widely used by organic geochemists to assess the origin and thermal maturity of fine-grained sedimentary rocks. In the last five years, it has become possible to determine the carbon isotopic composition of individual organic compounds using instruments with a gas chromatograph coupled to an isotope mass spectrometer. Application of isotope ratio monitoring of individual compounds (IRM/GC-MS) to a wide range of geological problems is beginning to emerge. PIs will utilize IRM/GC-MS for a direct comparison of the isotopic composition of lipid biomarkers (organic molecular fossils) between soft tissues and organic matter within mineralized tissues of bivalve shells. Both living shells and fossil shells will be surveyed. If sufficient quantities of lipids can be extracted from shells and if lipids from the shell mimic the isotopic composition of the mantle tissues, then it should be feasible to use shell lipids for studies of molecular paleontology and paleoecology.

有机地球化学家广泛使用对大量有机质和主要化合物类别中的光稳定同位素的分析来评估细粒沉积岩的起源和热成熟度。 在过去的五年中，使用气相色谱仪与同位素质谱仪联用的仪器已经可以确定单个有机化合物的碳同位素组成。 单个化合物的同位素比监测 (IRM/GC-MS) 在广泛的地质问题中的应用正在开始出现。 PI 将利用 IRM/GC-MS 直接比较双壳贝壳矿化组织内软组织和有机质之间的脂质生物标志物（有机分子化石）的同位素组成。 活贝壳和化石贝壳都将受到调查。 如果可以从贝壳中提取足够量的脂质，并且如果来自贝壳的脂质模拟地幔组织的同位素组成，那么使用贝壳脂质进行分子古生物学和古生态学研究应该是可行的。