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.

超深部起源钻石中的包裹体可以对软流圈、过渡带甚至下地幔的局部化学成分进行独特的了解，从而了解全球运输过程和再循环机制。来自Juina地区（巴西）的大部分研究样本显示了在过渡带（410-660公里）或地球下地幔（160 -660公里）内的起源证据（Harte und Harris, 1984； Stachel等人，2000b； Kaminsky等人，2001;2012，Brenker等人，2005,2007;Harte, 2012， Walter等人，2011，Pearson等人，2014,Bulanova, 2010）。在过去的几年里，在所谓的超深钻石中发现了两组不寻常的内含物。这些显示了流体发生或流体输送的证据（例如含水高达1.4 wt%的Ringwoodite， Pearson, Brenker, et al., 2014; Phase EGG, Wirth et al., 2007），另一方面，沉积部分（z.B. Phase EGG, Wirth et al., 2007; df -Phase + K-Hollandite + SiO2, Bulanowa et al., 2010），一直延伸到地球地幔的过渡带。对这些含水的致密高压矿物、致密含水矿物和高密度流体结晶的相的研究，使我们能够从其受尊敬的源区获得深部地幔内流体的化学成分，以及形成期间和后来挖掘时的物理化学条件。在预项目期间，通过非破坏性原位技术研究的钻石样品产生了大量的同生流体成分，几种致密的含水矿物（例如Phase Egg， Wirth等）。2007年)和含水矿物（如含水环伍德石，Pearson等，2014年）。这些发现将被非常详细地研究它们的化学成分和晶体结构，以便获得更多关于独特样品形成和挖掘过程中的条件的信息。重点将放在样品的透射电镜调查上。这将包括对沉淀、析出、变形以及相转变的研究，如层错和反相域。

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.