Tectonomagmatic Cycles and the Formation of Oceanic Crust at the Cleft Segment of the Juan de Fuca Ridge

胡安德富卡海岭裂隙段的构造岩浆旋回和洋壳的形成

• 批准号: 0221541
• 负责人: Michael Perfit
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0221541&HistoricalAwards=false
• 关键词: Tectonomagmatic; Cycles; Formation; Oceanic; Crust

Under this award, the PI will continue participating in a collaborative study of the Cleft segment of the Juan de Fuca ridge. The field work has been and will continue to be done with MBARI vessels and ROVs, in active collaboration with D. Stakes, M. Tivey, and others. The PI's main responsibility is in sampling of volcanic rocks, interpreting volcanic land forms, and undertaking laboratory analyses of the rock samples. One field program occurred in 2000, and another will take place in 2002. The PI has additional rock samples from the area collected in 1990 and 1994. The PI proposes flow mapping of the axial and off-axis region with a variety of goals and objectives, one of which is to test the "split-ridge" model of Kappel and Ryan for tectonic and magmatic cycles forming the symmetrical land forms on either side of the present ridge axis. Axial and off-axis sampling out to ~6km (150 ka) will be used to test this idea, and elucidate the processes of crust creation and evolution in the near-axis region. A full laboratory program of major and trace element studies and isotopic studies are planned for ROV-collected and wax cored samples.

根据这一奖项，PI将继续参与对Juan de Fuca脊裂部分的合作研究。现场工作已经并将继续使用MBARI船和ROV，与D.Stakes、M.Tivey和其他人积极合作。PI的主要职责是对火山岩进行采样，解释火山地貌，并对岩石样本进行实验室分析。一项实地方案于2000年实施，另一项将于2002年实施。PI还有1990年和1994年从该地区采集的额外岩石样本。PI提出了轴向和离轴区域的流动地图，其目的和目的各不相同，其中之一是测试Kappl和Ryan关于构造和岩浆旋回的“分裂脊”模型，该旋回在当前山脊轴线两侧形成对称的地貌。轴向和离轴取样至~6公里(150 Ka)将被用来检验这一观点，并阐明近轴地区地壳的形成和演化过程。计划对ROV收集的样品和蜡芯样品进行全面的实验室方案，包括主要和微量元素研究以及同位素研究。