Detailed Petrological and Geochemical Studies of Abyssal Peridotites

深渊橄榄岩的详细岩石学和地球化学研究

• 批准号: 0002663
• 负责人: Donald Elthon
• 金额: $ 22.98万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0002663&HistoricalAwards=false
• 关键词: Detailed; Petrological; Geochemical; Studies; Abyssal

This proposal requests funds to support detailed petrological and geochemical studies of abyssal peridotites recovered by the Ocean Drilling Program from the Hess Deep (Leg 147) and the Mid-Atlantic Ridge, south of the Kame Fracture Zone (Leg 153). Extensive abyssal peridotite suites recovered on each drilling leg. Studies by shipboard scientists form the framewrok for this study in which we propose to investigate the following key questions: (1) Are the calculated whole-rock NaxO contents inabyssal peridotites conclsively higher than melting and melt percolation models predict? (2) What are the localized distribution patterns of clinopyroxenes and spinals in abyssal peridotites? (3) What are the minor element and trance element abundances of clinopyroxene, spinal, orthopyroxene, and olivine in these abyssal periootites? What correlations exist in these minor and trace elements at mid-ocean ridges? (5) Is it possible to more accurately quantify melt-rock interactions, such as the particularly well developed examples from the Hess Deep?

这项提议要求提供资金，以支持对大洋钻探方案在赫斯深海(第147段)和卡梅断裂带以南的中大西洋海脊(第153段)发现的深海橄榄岩进行详细的岩石学和地球化学研究。在每个钻井段都发现了广泛的深海橄榄岩套。船上科学家的研究构成了这项研究的框架，我们建议调查以下关键问题：(1)深海橄榄岩中计算的全岩NaXO含量是否明显高于熔融和熔体渗流模型预测的含量？(2)深海橄榄岩中单斜辉石和尖晶石的局部分布模式？(3)这些深海橄榄岩中单斜辉石、脊椎辉石、斜方辉石和橄榄石的微量元素和常量元素丰度是什么？大洋中脊的这些微量和次要元素之间存在什么相关性？(5)有没有可能更准确地量化熔岩相互作用，比如赫斯深渊特别发达的例子？