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: 1240684
• 负责人: Paul Mann
• 金额: --
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-23 至 2012-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1240684&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.

该项目是在巴布亚新几内亚东端附近的岛屿上发现了非常年轻的超高压岩石的后续发现。一个主要目标是利用对这一地区的详细研究，更好地了解超高压岩石是如何从极深的地方到达地表的。由于这些岩石位于构造活跃区，因此可以认为，超高压折返模型有很大的改进机会，因为这个例子仍然处于其构造背景下。有证据表明，这一过程正在进行中。与这一目标相关的是对该地区整体构造演化的研究，这是帮助理解超高压岩石如何形成和来自哪里所必需的。在这个框架内，该项目涉及一系列研究，有助于拼凑出超高压折返历史和构造演化。一项大型研究涉及被动地震数据采集，以成像可能在深处部分出土的高压/超高压岩石区域下的地壳和地幔；很大一部分研究涉及岩石学、地质学、矿物物理和地球化学。此外，还包括GPS工作和地球动力学建模。