Fabric Transitions in an oceanic detachment fault; IODP Expedition 357

GSTDTAP

项目编号	NE/P000711/1
	Fabric Transitions in an oceanic detachment fault; IODP Expedition 357
	[unavailable]
主持机构	University of Leeds
项目开始年	2016
	2016-04-01
项目结束日期	2016-12-31
资助机构	UK-NERC
项目类别	Research Grant
国家	英国
语种	英语
英文摘要	e have known for the last 50 years that Europe and America have been moving apart at about 2cm/yr by processes of seafloor spreading that generate new oceanic crust at the submarine mid-Atlantic Ridge. This is one of the fundamental processes of Plate Tectonics, and has shaped the planet that we live on. Yet because we cannot use standard remote sensing techniques using electromagnetic radiation to study the seafloor, in many ways we know more about the surface of Mars than we do about the floor of the Atlantic! Over the last 12 years improved sonar surveys of the mid Atlantic Ridge have revealed a new mode of seafloor spreading where a significant part of the plate divergence is taken up by slip on long-lived, convex upward detachment faults, rather than mainly by magmatic intrusion. Up to half of the Atlantic seafloor may have formed in this way. New drilling using sea bottom drills in IODP Expedition 357 means that we have better samples of an oceanic detachment fault than ever before. These samples will be studied using scanning electron microscope and electron probe techniques to look for the amount of deformation and the way it is localised by different overprinting alteration assemblages. In this way we will understand better how and why deformation takes place on these faults. These studies will be linked to geochemical and isotopic studies by other scientists to understand the role of seawater derived fluids in localising deformation
来源学科分类	Natural Environment Research
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/86073
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	[unavailable].Fabric Transitions in an oceanic detachment fault; IODP Expedition 357.2016.