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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Nanocrystalline (Mg, Fe, Cr)TiO3 perovskite inclusions in olivine from a mantle xenolith, Udachnaya-East kimberlite pipe, Siberia
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Nanocrystalline (Mg, Fe, Cr)TiO3 perovskite inclusions in olivine from a mantle xenolith, Udachnaya-East kimberlite pipe, Siberia

机译：西伯利亚Udachnaya-East金伯利岩管的地幔异种岩中橄榄石中的纳米晶（Mg，Fe，Cr）TiO3钙钛矿包裹体

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摘要

Olivine grains from an ilmenite-garnet-peridotite nodule from the kimberlite pipe Udachnaya-Wostotschnaya, Siberia have been investigated by TEM methods (electron diffraction, HREM, AEM, EELS). The nodule is a high-temperature garnet peridotite, which equilibrated at about 1200-1300 degrees C and 200 km depth. TEM investigation of several olivine grains revealed nanometre-sized inclusions of (Mg,Fe,Cr)TiO3 perovskite together with ilmenite. Both types of inclusions exhibit a typical grain size of about 50 nm. The crystal structure of the perovskite inclusions is monoclinic with a(o)=1.095 nm, b(o) = 0.5169 nm, c(o)=0.743 nm and the monoclinic angle beta = 95 degrees. The orientation relationship between perovskite and olivine is (101)(ol)//(300)(per) and [010](ol)//[0 (1) over bar0](per). This observation combined with the experimentally determined ilmenite/perovskite phase boundary [A. Metha, K. Leinenweber, A. Navrotsky, M. Akaogi, Calorimetric study of high-pressure polymorphism in FeTiO3: stability of the perovskite phase, Phys. Chem. Minerals, 21 (1994) 207-212] [8] allows the use of perovskite in olivine as a geobarometer. The presence of perovskite in olivine suggests that the peridotite originated at pressures of 8-10 GPa, significantly higher than the pressure of last silicate equilibration (4.5-6.5 GPa). (C) 2005 Elsevier B.V. All rights reserved.
机译：西伯利亚金伯利岩管Udachnaya-Wostotschnaya的钛铁矿-石榴石-橄榄岩的结核中的橄榄石颗粒已通过TEM方法（电子衍射，HREM，AEM，EELS）进行了研究。结核是高温石榴石橄榄岩，其在大约1200-1300摄氏度和200 km深度达到平衡。几种橄榄石晶粒的TEM研究表明，（Mg，Fe，Cr）TiO3钙钛矿和钛铁矿的纳米级夹杂物。两种类型的夹杂物均表现出约50nm的典型晶粒尺寸。钙钛矿夹杂物的晶体结构是单斜晶，a（o）＝ 1.095nm，b（o）＝ 0.5169nm，c（o）＝ 0.743nm，并且单斜角β＝ 95度。钙钛矿和橄榄石之间的取向关系是（101）（ol）//（300）（per）和[010]（ol）// [0（1）over bar0]（per）。该观察结果与实验确定的钛铁矿/钙钛矿相界相结合[A. Metha，K. Leinenweber，A.Navrotsky，M.Akaogi，FeTiO3中高压多态性的量热研究：钙钛矿相的稳定性。化学Minerals，21（1994）207-212] [8]允许在橄榄石中使用钙钛矿作为气压计。橄榄石中钙钛矿的存在表明橄榄岩起源于8-10 GPa的压力，明显高于最后一次硅酸盐平衡的压力（4.5-6.5 GPa）。 （C）2005 Elsevier B.V.保留所有权利。

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