Ge/Si-Opal and the "Missing Sink"-Investigation of Germanium Geochemistry and Paleoredox

锗/硅蛋白石和“失踪的汇”——锗地球化学和古氧化还原的研究

• 批准号: 9811199
• 负责人: Philip Froelich
• 金额: $ 22万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9811199&HistoricalAwards=false
• 关键词: Ge; Si; Opal; Missing; Sink

ABSTRACT FROELICH / 9811199 The PI proposes to continue his studies into the geochemical cycling of germanium and silica in the ocean, and the interpretation of Ge/Si-opal records in sediment cores. The two major goals of this proposal are to: 1) use pore water and sediment analyses of Ge to study the diagenetic behavior of Ge, and 2) test the hypothesis that Ge and Si are not fractionated during biouptake. The samples to be analyzed under this proposal represent a unique set of marine sediment, pore water, sediment trap materials, which have been collected by the PI on recent cruises. This proposal provides the opportunity to close the Ge balance in the oceans, since diagenetic reactions in the suboxic zone may represent a non-opal "missing Ge-sink" needed to balance the opal, fluvial and hydrothermal Ge/Si cycle in the ocean. These results will permit a better interpretation of the marine sediment Ge/Si-opal and opal accumulation records, and thus provide a deeper understanding of the interactions among climate change, ocean chemistry and paleoproductivity.

Froelich/9811199他建议继续研究海洋中Ge和SiO_2的地球化学循环，以及沉积物岩心中Ge/Si-Opal记录的解释。这一建议的两个主要目的是：1)利用Ge的孔隙水和沉积物分析来研究Ge的成岩行为；2)检验Ge和Si在生物吸收过程中不分馏的假设。根据这一建议进行分析的样本代表了一套独特的海洋沉积物、孔隙水、沉积物捕捉器材料，这些材料是国际海事组织在最近的几次邮轮上收集的。这一提议提供了关闭海洋中的Ge平衡的机会，因为亚氧基带的成岩反应可能代表着平衡海洋中的蛋白石、河流和热液Ge/Si循环所需的非蛋白石“缺失的Ge-汇”。这些结果将有助于更好地解释海洋沉积物Ge/Si-蛋白石和蛋白石的积累记录，从而加深对气候变化、海洋化学和古生产力之间相互作用的理解。