Collaborative Research: How Is Rifting Exhuming the Youngest High-pressure and Ultrahigh-pressure (HP/UHP) Rocks on Earth?

合作研究：裂谷作用如何挖掘出地球上最年轻的高压和超高压 (HP/UHP) 岩石？

• 批准号: 0814236
• 负责人: Geoffrey Abers
• 金额: $ 106.38万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-01-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0814236&HistoricalAwards=false
• 关键词: Collaborative; Research; How; Rifting; Exhuming

The project is a follow-on to the discovery that there are very young UHP rocks exposed on islands near the eastern tip of Papua New Guinea (PNG). A major objective is to use detailed study of this area to better understand how UHP rocks get to the surface from great depth. Because the rocks are in a tectonically active region, it can be argued that there is a good chance of improving models for UHP exhumation because this example is still in its tectonic context. There is evidence that the process is ongoing. Related to this objective is the study of the overall tectonic evolution of this area, which is needed in order to help understand how the UHP rocks got where they are and from whence they came.Within this framework, this project involves a range of studies that can contribute to piecing together the UHP exhumation history and the tectonic evolution. One large study involves passive seismic data acquisition to image the crust and mantle beneath the area where partially exhumed HP/UHP rocks may occur at depth; a large fraction of the studies involve petrology, geology, mineral physics and geochemistry. In addition, GPS work and geodynamic modeling are included.

该项目是继巴布亚新几内亚东端附近岛屿上发现非常年轻的超高压岩石之后的又一发现。一个主要目标是对这一地区进行详细研究，以更好地了解超高压岩石是如何从深处到达地表的。由于岩石处于构造活动区域，因此可以认为，由于这个例子仍然处于构造背景中，因此有很好的机会改进超高压挖掘模型。有证据表明，这个过程正在进行中。与这一目标相关的是对该地区整体构造演化的研究，这有助于理解超高压岩石是如何形成的，以及它们从何而来。在这个框架内，该项目涉及一系列研究，可以将超高压挖掘历史和构造演化结合起来。一项大型研究涉及被动地震数据采集，以成像部分挖掘出的高压/超高压岩石可能存在的区域下方的地壳和地幔；大部分研究涉及岩石学、地质学、矿物物理学和地球化学。此外，还包括GPS工作和地球动力学建模。