Isotope effects in carbonate minerals: Proxies for environmental changes and biosignatures

碳酸盐矿物中的同位素效应：环境变化和生物特征的代表

• 批准号: RGPIN-2015-04413
• 负责人: Kim, SangTae
• 金额: $ 1.6万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=589786
• 关键词: Isotope; effects; carbonate; minerals; Proxies

Carbonates such as calcite and aragonite are among the most abundant minerals on the surface of the Earth. Due to their natural ubiquity, these carbonate minerals have frequently been the subject of physical, chemical, and geological studies. In particular, Earth scientists and paleoclimatologists have long used the geochemical properties of marine and continental carbonates to decipher Earth's past environmental variations, providing paleoenvironmental records for the development of accurate climate models that are capable of future climate prediction. For example, corals, cave deposits, fish ear-bones, and shells of marine plankton have been invaluable carbonate climate archives in the fields of paleoclimatology and paleoceanography. With the financial assistance of the Discovery Grants program, my research group will characterize multiple geochemical properties of laboratory-grown carbonates depending on their growth conditions. The mechanisms of these environment-sensitive geochemical signatures will then be identified, establishing theoretical baselines to develop new innovative geochemical tools to better extract the past environmental changes, as well as the fingerprints of biological activities recorded in carbonate minerals when they formed.

方解石和文石等碳酸盐是地球表面最丰富的矿物之一。由于它们在自然界的普遍存在，这些碳酸盐矿物经常成为物理、化学和地质研究的主题。特别是，地球科学家和古气候学家长期以来一直利用海洋和大陆碳酸盐的地球化学性质来破译地球过去的环境变化，为开发精确的气候模型提供古环境记录，从而能够预测未来的气候。例如，在古气候学和古海洋学领域，珊瑚、洞穴沉积物、鱼耳骨和海洋浮游生物的壳是宝贵的碳酸盐气候档案。在发现补助金计划的财政援助下，我的研究小组将根据实验室生长的碳酸盐的生长条件描述其多种地球化学特性。这些环境敏感地球化学特征的机制将被确定，为开发新的创新地球化学工具建立理论基础，以更好地提取过去的环境变化，以及碳酸盐矿物形成时记录的生物活动指纹。