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Electron microscopic study of the composition, the microstructure and defects of natural dense hydrous minerals and of phases that crystallize from high density fluid inclusions in diamond.

对天然致密含水矿物和金刚石高密度流体包裹体结晶相的成分、微观结构和缺陷进行电子显微镜研究。

基本信息

批准号：
264128933
负责人：
Professor Dr. Frank Erich Brenker
金额：
--
依托单位：
School of Geographical and Earth Sciences
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/264128933?language=en
关键词：
Electron microscopic study composition microstructure

项目摘要

Inclusions in diamond with super deep origin enable unique insights into the local chemical composition of the asthenosphere, the transition zone or even the lower mantle and therefore into the global transport processes and recycling mechanism.A large part of the studied samples from the Juina area (Brazil) show evidence for an origin within the transition zone (410-660km) or the Earth´s lower mantle (> 660km) (Harte und Harris, 1984; Stachel et al., 2000b; Kaminsky et al., 2001; 2012, Brenker et al., 2005, 2007; Harte, 2012, Walter et al., 2011, Pearson et al., 2014, Bulanova, 2010).Within the last years two unusual suites of inclusions in so called super deep diaomnds were recognized. These show evidence for the occurence of fluids or fluid transport (e.g. hydrous Ringwoodite with up to 1,4 wt% water, Pearson, Brenker, et al., 2014; Phase EGG, Wirth et al., 2007) and on the other hand for sedimentary parts (z.B. Phase EGG, Wirth et al., 2007; CF-Phase + K-Hollandite + SiO2, Bulanowa et al., 2010) down to the transition zone of the Earth´s mantle. The investigation of these water-bearing dense high pressure minerals, dense hydrous minerals and phases that cristallize from high density fluids enables to acquire the chemical composition of fluids within the deep Earth´s mantle from their respected source region and of the physico-chemical conditions during formation and later exhumation.The diamond samples studied during a preproject by the means of non-destructive in-situ techniques yield a high amount of syngenetic fluid components, several dense hydrous minerals (e.g. Phase Egg, Wirth et al,. 2007) and water-bearing minerals (e.g. waterbearing ringwoodite, Pearson et al, 2014). These findings will be studied in great detail for their chemical composition and their crystal structure in order to get more information about the conditions during formation and exhumation of the unique samples.The main focus will be on the TEM investigation of the samples. This will include the study of precipitates, exsolution, deformation, as well as phase transformations, like stacking faults and antiphase domains.

具有超深成因的钻石中的包裹体使我们能够独特地洞察软流圈、过渡带甚至下地幔的局部化学成分，从而了解全球的运输过程和再循环机制。来自Juina地区(巴西)的大部分研究样品表明，起源于过渡带(410-660公里)或地球的S下地幔(&gt；660公里)(Harte und Harris，1984；Stachel等人，2000b；Kaminsky等人，2001年；2012年，Brenker等人，2005,2007；Harte，2012，Walter等人，2011，Pearson等人，2014，Bulanova，2010)。在过去的几年里，在所谓的超深部辉长岩中发现了两套不寻常的包裹体。这些证据表明存在流体或流体输送(例如，含水高达1，4wt%的环木岩类，Pearson，Brenker等，2014；阶段Eg，Wirth等，2007年)；另一方面，沉积部分(Z.B.阶段Eg，Wirth等，2007年；Cf相+K-Hollandite+SiO_2，Bulanowa等，2010年)向下延伸到地球的S地幔过渡带。通过对这些含水的致密高压矿物、致密含水矿物和从高密度流体中结晶而来的相的研究，可以从其重要的源区获得地球深部S地幔内流体的化学成分，以及形成和后来折返过程中的物理化学条件。通过非破坏性原位技术在前期项目中研究的钻石样品产生了大量的同生流体成分和几种致密的含水矿物(如阶段Egg、Wirth等)。含水矿物(如含水环木岩，Pearson等人，2014年)。这些发现将对其化学成分和晶体结构进行详细研究，以获得更多关于独特样品形成和挖掘过程中的条件的信息。主要重点将是样品的透射电子显微镜研究。这将包括对沉淀、出溶、变形以及相变的研究，如层错和反相区。