Trace-element mobilization during dehydration reactions in slabs: constraints from eclogite-facies veins (Tianshan, China)

板片脱水反应过程中微量元素的迁移：榴辉岩相脉的限制（中国天山）

• 批准号: 32481179
• 负责人: Professor Dr. Reiner Klemd
• 金额: --
• 依托单位: Institute of Geology and Geophysics
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/32481179?language=en
• 关键词: Trace; element; mobilization; during; dehydration

Aqueous low- to high-solute fluids and/or supercritical hydrous melts released from the oceanic crust are believed to be responsible for trace element transport from the subducting slab to the overlying mantle wedge under UHP conditions. Reliable information on the nature and the composition of these UHP fluids as well as their capability to transport major and trace elements is scarce and stems exclusively from former subducted continental crust. A unique opportunity to study UHP veins in former subducted oceanic crust is given in the western Tianshan HP-LT metamorphic belt in north-western China. The aim of the intended study is to provide insight into fluid-rock interaction and element transfer during fluid flow under UHP conditions in subduction zones by means of a petrological (mineral chemistry, geothermobarometry) and geochemical (major and trace elements, fluid inclusions) investigation of the UHP veins and associated country rocks. In addition, it is intended to constrain the composition and type of fluid responsible for associated metasomatism and trace element transfer to the overlying mantle wedge.

从大洋地壳释放的低到高溶质的含水流体和/或超临界含水熔体被认为是负责微量元素从俯冲板片上覆地幔楔在超高压条件下的传输。关于这些超高压流体的性质和组成及其迁移主要和微量元素的能力的可靠信息很少，而且完全来自前俯冲大陆地壳。西天山高压-低温变质带是研究前俯冲洋壳中超高压脉体的一个难得的机会。预期研究的目的是通过对超高压脉和相关围岩的岩石学（矿物化学、地质温压法）和地球化学（主要和微量元素、流体包裹体）调查，深入了解俯冲带超高压条件下流体流动过程中的流体-岩石相互作用和元素转移。此外，它的目的是限制的组成和类型的流体负责相关的交代和微量元素转移到上覆地幔楔。

项目成果

Coexisting carbonate-bearing eclogite and blueschist in SW Tianshan, China: Petrology and phase equilibria

• DOI: 10.1016/j.jseaes.2012.08.015
• 发表时间: 2012-10
• 期刊: Journal of Asian Earth Sciences
• 影响因子: 3
• 作者: Ji‐Lei Li;R. Klemd;Jun Gao;M. Meyer

High-pressure mafic oceanic rocks from the Makbal Complex, Tianshan Mountains (Kazakhstan & Kyrgyzstan): Implications for the metamorphic evolution of a fossil subduction zone

• DOI: 10.1016/j.lithos.2013.06.015
• 发表时间: 2013-09
• 期刊: Lithos
• 影响因子: 3.5
• 作者: M. Meyer;R. Klemd;D. Konopelko

Eclogitization of transient crust of the Aktyuz Complex during Late Palaeozoic plate collisions in the Northern Tianshan of Kyrgyzstan

• DOI: 10.1016/j.gr.2013.08.018
• 发表时间: 2014-11
• 期刊: Gondwana Research
• 影响因子: 6.1
• 作者: R. Klemd;E. Hegner;H. Bergmann;J. Pfänder;Ji‐Lei Li;F. Hentschel

Compositional zoning in dolomite from lawsonite-bearing eclogite (SW Tianshan, China): Evidence for prograde metamorphism during subduction of oceanic crust

• DOI: 10.2138/am.2014.4507
• 发表时间: 2014
• 期刊: American Mineralogist
• 影响因子: 3.1
• 作者: Ji‐Lei Li;R. Klemd;Jun Gao;M. Meyer

Subduction and exhumation mechanisms of ultra‐high and high‐pressure oceanic and continental crust at Makbal (Tianshan, Kazakhstan and Kyrgyzstan)

• DOI: 10.1111/jmg.12097
• 发表时间: 2014-10
• 期刊: Journal of Metamorphic Geology
• 影响因子: 3.4
• 作者: M. Meyer;R. Klemd;E. Hegner;D. Konopelko