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首页> 外文期刊>Contributions to Mineralogy and Petrology >The Ca-Eskola component in eclogitic clinopyroxene as a function of pressure, temperature and bulk composition: an experimental study to 15 GPa with possible implications for the formation of oriented SiO2-inclusions in omphacite
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The Ca-Eskola component in eclogitic clinopyroxene as a function of pressure, temperature and bulk composition: an experimental study to 15 GPa with possible implications for the formation of oriented SiO2-inclusions in omphacite

机译：氯次生辉石中Ca-Eskola组分随压力，温度和体积组成的变化：对15 GPa的实验研究，可能对绿辉石中定向SiO 2 -夹杂物的形成有影响

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摘要

Experiments have been conducted in the P-T range 2.5–15 GPa and 850–1,500°C using bulk compositions in the systems SiO2–TiO2–Al2O3–Fe2O3–FeO–MnO–MgO–CaO–Na2O–K2O–P2O5 and SiO2–TiO2–Al2O3–MgO–CaO–Na2O to investigate the Ca-Eskola (CaEs Ca0.5□0.5AlSi2O6) content of clinopyroxene in eclogitic assemblages containing garnet + clinopyroxene + SiO2 ± TiO2 ± kyanite as a function of P, T, and bulk composition. The results show that CaEsss in clinopyroxene increases with increasing T and is strongly bulk composition dependent whereby high CaEs-contents are favoured by bulk compositions with high normative anorthite and low diopside contents. In this study, a maximum of 18 mol% CaEsss was found at 6 GPa and 1,350°C in a kyanite-eclogite assemblage garnet + clinopyroxene + kyanite + rutile + coesite. By comparison, no significant increase in CaEsss with increasing P could be observed. If the formation of oriented SiO2-rods frequently observed in eclogititc clinopyroxenes is due to the retrogressive breakdown of a CaEs-component then these textures are a cooling rather than a decompression phenomenon and are most likely to be found in kyanite-bearing eclogites cooled from temperatures ≥750°C. The presence of clinopyroxene with approx. 4 mol% CaEsss in an experiment conducted at 2.5 GPa/850°C confirms earlier suggestions based on field data that vacancy-rich clinopyroxenes are not necessarily restricted to ultrahigh pressure metamorphic conditions.
机译：已在SiO 2 -TiO 2 -Al 2 <系统中使用本体组成在PT范围2.5–15 GPa和850–1,500°C下进行了实验。 / sub> O 3 –Fe 2 O 3 –FeO–MnO–MgO–CaO–Na 2 O –K 2 O–P 2 O 5 和SiO 2 –TiO 2 -Al 2 O 3 -MgO–CaO–Na 2 O研究Ca-Eskola（CaEs Ca 0.5 2 的阳刚组合中斜cl基的>□ 0.5 AlSi 2 O 6 ）± TiO 2 ±蓝晶石作为P，T和本体组成的函数。结果表明，斜吡咯中的CaEs ss 随着T的增加而增加，并且强烈依赖于整体组成，因此高标准钙长石和低透辉石含量的整体组成有利于高CaEs含量。在这项研究中，在6 GPa和1,350°C的蓝晶石-榴辉岩组合石榴石+斜ino石+蓝晶石+金红石+堇青石中发现最大18 mol％CaEs 。相比之下，没有观察到CaEs ss 随着P的增加而显着增加。如果在氯吡喹啉环庚烯中经常观察到取向的SiO 2 -棒的形成是由于CaEs组分的逆向分解，则这些纹理只是冷却而不是减压现象，最可能被发现温度≥750°C冷却的含蓝晶的榴辉岩中。大约有环吡咯烯的存在。在2.5 GPa / 850°C下进行的4 mol％CaEss ss 证实了基于野外数据的早期建议，即富空位的斜py烯并不一定限于超高压变质条件。

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