Geologic and Geophysical Studies of Mesozoic Guyots

中生代居奥特的地质和地球物理研究

• 批准号: 8717079
• 负责人: Edward Winterer
• 金额: $ 43万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-01 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8717079&HistoricalAwards=false
• 关键词: Geologic; Geophysical; Studies; Mesozoic; Guyots

This award will support Dr. Winterer of Scripps Institution to participate in a study of the morphology, sediment history, and geochemistry of guyots which are located between the Japan Trench and the Hawaiian Islands. This area of the Pacific Ocean is known to be unique and is characterized by numerous seamount chains, atolls and guyot groups which began forming during a Cretaceous period of extensive volcanism. Data to be collected during a field program aboard the Thomas Washington include reflection seismic profiles, gravity and magnetics across individual guyots as well as sampling of these features. These data will be used to examine questions on the age sequences of volcanism, Cretaceous Pacific Plate motions, lithosphere flexuring and elastic/thermal thickness, geochemical affinities and mantle sources of volcanics, seamount paleolatitudes, thickness and internal stratigraphy of guyot reef caps, and the timing and causes of reef drowning. These data will be used to examine the hypothesis that the older northwest end of this "Darwin Belt" of seamount chains was underlain in Cretaceous times by the type of mantle and thin, hot lithosphere that now underlies the active, southeast part of the belt. This is a cooperative project involving scientist at Scripps Institution, Texas A & M University and the Massachusetts Institute of Technology. Data from this project will be important in planning future ocean drilling in this region.

该奖项将支持斯克里普斯研究所的温特博士 参与一项关于形态学，沉积历史， 和位于日本之间的盖奥特的地球化学 海沟和夏威夷群岛。太平洋的这片海域 已知是独一无二的，其特点是有许多海山 珊瑚链、环礁和盖奥特群， 白垩纪广泛的火山活动。收集数据 在托马斯华盛顿号上的一次实地考察中， 反射地震剖面、重力和磁力 个别盖奥特以及这些特征的取样。这些 数据将被用来检查的年龄序列的问题， 火山作用，白垩纪太平洋板块运动，岩石圈 挠曲和弹性/热厚度、地球化学亲合性 火山岩的地幔源，海山古纬度， 盖奥特礁盖的厚度和内部地层， 珊瑚礁溺水的时间和原因。这些数据将用于 检验这个古老的西北端 白垩纪形成海山链“达尔文带” 时代的地幔和薄而热的岩石圈， 位于活动带的东南部 这是一个合作项目， 斯克里普斯研究所，德克萨斯农工大学和马萨诸塞州 理工学院该项目的数据将非常重要 未来在这一地区的海洋钻探计划。