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.

具有超深起源的钻石中的包含物可以对运动层，过渡区甚至下地幔的局部化学成分，因此可以进入全球运输过程和回收机制。 UND HARRIS，1984年，Stachel等，2000b；这些显示了出现液体或液体传输的证据（例如，含水林木含有高达1,4 wt％的水，Pearson，Brenker等，2014； Epep Egg，Wirth等，2007），另一方面用于沉积部件（Z.B. epep Egg，Wirth Egg，Wirth等，2007; Cf-phase + k-phase + k-phase + k-phase + s bulan + s），地球的过渡区。这些含水浓厚的高压矿物质，浓密的含水矿物质和从高密度烟道中爬行的阶段，可以使深地球内的液体在深地球内的化学成分从其受人尊敬的源区域内的地幔中获得，并在形成和呼吸过程中逐渐散发出钻石的钻石型在不脱落的情况下。合成液体成分，几种致密的含水矿物质（例如相鸡蛋，Wirth等，2007）和含水矿物（例如，水木地石，Pearson等，2014）。这些发现将详细研究它们的化学成分和晶体结构，以获取有关独特样品形成和挖掘过程中条件的更多信息。主要重点将放在样品的TEM投资上。这将包括对沉淀物，实质性，变形以及相变的研究，例如堆叠断层和反相域。