Multi-Mineral Geochronology and REE Geochemistry of High- and Ultrahigh-Pressure Metamorphic Rocks: North Qaidam Terrane, Northwest China
高压和超高压变质岩的多矿物年代学和稀土地球化学:中国西北柴达木地体
基本信息
- 批准号:0710927
- 负责人:
- 金额:$ 17.96万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2007
- 资助国家:美国
- 起止时间:2007-07-01 至 2010-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Intellectual merit. Ultrahigh-pressure (UHP) metamorphism (i.e., at depths 80 km) is a consequence of continental subduction and collision. Investigation of such rarely exposed rocks can provide new insights into processes of continental collision, growth, and mountain building, as well as crust/mantle interaction. An outstanding question regarding UHP metamorphism concerns how these rocks return to the surface while preserving their high P/T mineral assemblages. Critical to addressing this question is a better understanding of the exhumation rates. To attain such information, this project focuses on well exposed eclogite-facies rocks of the North Qaidam Mountains of China. U-Pb geochronology of zircon, monazite and titanite will be coupled with pressure, temperature, and mineral paragenesis (based on REE geochemistry, mineral inclusion analysis, and thermobarometry) to evaluate ages of peak and retrograde metamorphism. These data will constrain exhumation rates associated with their eclogite- to granulite- and amphibolite-facies decompression. Rates will be calculated based on the age difference (determined by U-Pb geochronology of accessory zircon and other phases) between superposed mineral growth zones corresponding to different pressures (depths) of formation (as inferred from mineral inclusions, REE geochemistry, and thermobarometry of garnet-bearing mineral assemblages). This study is likely to significantly advance our knowledge of the geologic history of the N. Qaidam terrane, and provide new perspectives on UHP exhumation processes in general. Broader impacts. Central to this research is collaboration with Chinese colleagues, thereby enhancing international scientific exchange and cooperation. Collaborative research during our previous research has resulted in six journal publications, and we expect to continue this productive collaboration. The trace element analysis routine developed during our previous and continuing work expands capabilities of the state-of-the-art, multi-user Stanford-USGS SHRIMP-RG facility, thereby enhancing the utility of this facility for research and education. This project will also provide training and research experience for Stanford University graduate and undergraduate students.
智力上的优点。超高压(UHP)变质作用(即,深度80公里)是大陆俯冲和碰撞的结果。对这些很少暴露的岩石的研究可以为大陆碰撞、生长和造山过程以及地壳/地幔相互作用提供新的见解。关于超高压变质作用的一个悬而未决的问题是,这些岩石如何返回到地表,同时保留其高P/T矿物组合。解决这一问题的关键是更好地了解挖掘率。为了获得这些信息,本项目的重点是中国柴北缘的榴辉岩相岩石。锆石、独居石和钛铁矿的U-Pb年代学将与压力、温度和矿物共生(基于稀土元素地球化学、矿物包裹体分析和热压法)相结合,以评估峰期和退变质作用的年龄。 这些数据将限制与榴辉岩-麻粒岩相和角闪岩相减压有关的折返速率。将根据与不同形成压力(深度)对应的叠加矿物生长带之间的年龄差(通过副锆石和其他相的U-Pb地质年代学确定)(根据矿物包裹体、稀土元素地球化学和含石榴石矿物组合的热压测定法推断)计算速率。这项研究可能会大大推进我们对北大西洋的地质历史的认识。柴达木盆地超高压折返过程的研究提供了新的视角。更广泛的影响。这项研究的核心是与中国同事合作,从而加强国际科学交流与合作。在我们以前的研究中,合作研究已经在六个期刊上发表,我们希望继续这种富有成效的合作。在我们以前和持续的工作中开发的微量元素分析程序扩展了最先进的多用户Stanford-USGS SHRIMP-RG设施的能力,从而提高了该设施在研究和教育方面的实用性。该项目还将为斯坦福大学的研究生和本科生提供培训和研究经验。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Dennis Bird其他文献
Dennis Bird的其他文献
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{{ truncateString('Dennis Bird', 18)}}的其他基金
Collaborative Research on the Iceland Deep Drilling Project: An Investigation of a High-Temperature Mid-Ocean Ridge Hydrothermal System in a 5 km Deep Borehole
冰岛深钻项目合作研究:5公里深钻孔高温洋中脊热液系统研究
- 批准号:
0506882 - 财政年份:2005
- 资助金额:
$ 17.96万 - 项目类别:
Continuing Grant
Zircon Geochronology and REE Geochemistry of High- and Ultrahigh-Pressure Metamorphic Rocks: North Qaidam and South Altun Terranes, Northwest China
高压和超高压变质岩的锆石年代学和稀土地球化学:中国西北柴达木地体和南阿尔金地体
- 批准号:
0408690 - 财政年份:2004
- 资助金额:
$ 17.96万 - 项目类别:
Standard Grant
Strontium Attenuation in Basaltic Aquifers: Experimental Determination of Ca2+-Na+-Sr2+-K+ Exchange Between Heulandite and Aqueous Solutions
玄武岩含水层中的锶衰减:片沸石与水溶液之间 Ca2-Na-Sr2-K 交换的实验测定
- 批准号:
0001113 - 财政年份:2000
- 资助金额:
$ 17.96万 - 项目类别:
Standard Grant
Seasonal Attenuation and Release of Arsenic by Pyrite Weathering Products, Southern Mother Lode Gold District, California
加利福尼亚州南主矿金区黄铁矿风化产品造成砷的季节性衰减和释放
- 批准号:
9902859 - 财政年份:1999
- 资助金额:
$ 17.96万 - 项目类别:
Standard Grant
Interaction Between the Iceland Mantle-Plume and the Hydrosphere: Tectonic and Climatic Effects on Hydrothermal Solutions
冰岛地幔柱与水圈之间的相互作用:构造和气候对热液的影响
- 批准号:
9506469 - 财政年份:1995
- 资助金额:
$ 17.96万 - 项目类别:
Standard Grant
Precious Metal Mineralization in an Oceanic-Type Layered Gabbro: Kap Edvard Holm Complex, East Greenland
海洋型层状辉长岩中的贵金属矿化:东格陵兰 Kap Edvard Holm 杂岩
- 批准号:
9220431 - 财政年份:1993
- 资助金额:
$ 17.96万 - 项目类别:
Standard Grant
Transport, Concentration, and Deposition of Precious Metals in Layered Gabbros During Continental Rifting
大陆裂谷期间层状辉长岩中贵金属的传输、富集和沉积
- 批准号:
9206962 - 财政年份:1992
- 资助金额:
$ 17.96万 - 项目类别:
Standard Grant
Mass Transfer Processes During Crustal Rifting
地壳裂谷期间的传质过程
- 批准号:
9004007 - 财政年份:1990
- 资助金额:
$ 17.96万 - 项目类别:
Continuing Grant
Geochemical and Structural Evolution of Gabbro-Hosted Magma-Hydrothermal Systems: East Greenland
辉长岩岩浆热液系统的地球化学和结构演化:东格陵兰
- 批准号:
8803754 - 财政年份:1988
- 资助金额:
$ 17.96万 - 项目类别:
Continuing Grant
Reactions and Mass Transfer in the Fluid Source Region of the Skaergaard Magma-Hydrothermal System
斯卡尔加德岩浆热液系统流体源区的反应和传质
- 批准号:
8606256 - 财政年份:1986
- 资助金额:
$ 17.96万 - 项目类别:
Continuing Grant
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