...
  • 主题
高级搜索  >
历史搜索 清空历史
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 SiO_2-inclusions in omphacite
【24h】

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 SiO_2-inclusions in omphacite

机译：环氧氯吡ino烯中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

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Experiments have been conducted in the P-T range 2.5-15 GPa and 850-1,500 deg C using bulk compositions in the systems SiO_2-TiO_2-Al_2O3-Fe_2O3-FeO-MnO-MgO-CaO-Na_2O-K_2O-P_2O_5 and SiO_2-TiO_2-Al_2O_3-MgO-CaO-Na_2O to investigate the Ca-Eskola (CaEs Ca_(0.5) □_(0.5)AlSi_2O_6) content of clinopyroxene in eclogitic assemblages containing garnet + clinopyroxene + SiO_2 + -TiO_2 + - kyanite as a function of P, T, and bulk composition. The results show that CaEs_(ss) 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 percent CaEs_(ss) was found at 6 GPa and l,350 deg C in a kyanile-eclogite assemblage garnet + clinopyroxene + kyanite + rulile + coesite. By comparison, no significant increase in CaEs_(ss) with increasing P could be observed. If the formation of oriented SiO_2-rods frequently observed in eclogititc clinopyroxenes is due to the retrogressive breakdown of a CaEs-componenl then these textures arc a cooling rather than a decompression phenomenon and are most likely to be found in kyanite-bearing eclogites cooled from temperatures > 750 deg C. The presence of clinopyroxene with approx. 4 mol percent CaEs_(ss) in an experiment conducted at 2.5 GPa/850 deg C confirms earlier suggestions based on field data that vacancy-rich clinopyroxenes are not necessarily restricted to ultrahigh pressure metamorphic conditions.
机译：使用SiO_2-TiO_2-Al_2O3-Fe_2O3-FeO-MnO-MgO-CaO-Na_2O-K_2O-P_2O_5和SiO_2-TiO_2-系统中的本体组成在PT范围2.5-15 GPa和850-1,500摄氏度下进行了实验Al_2O_3-MgO-CaO-Na_2O用于研究含石榴石+斜向辉石+ SiO_2 + -TiO_2 +-蓝晶石与P的函数的斜向组合中斜辉石的Ca-Eskola（CaEs Ca_（0.5）□_（0.5）AlSi_2O_6）含量T和散装组成。结果表明，环吡咯烯中的CaEs_（ss）随T的增加而增加，并且强烈依赖于整体组成，因此高规范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℃下，在蓝晶-榴辉岩组合石榴石+斜柏石+蓝晶石+铝矾石+堇青石中发现最大18 mol％CaEs_（ss）。相比之下，没有观察到CaEs_（ss）随着P的增加而显着增加。如果在氯吡喹啉亚吡咯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，则这些结构是冷却而不是减压现象，并且最有可能在从温度冷却的含蓝晶的榴辉岩中发现> 750摄氏度。在2.5 GPa / 850摄氏度下进行的实验中，4 mol％CaEs_（ss）证实了基于野外数据的早期建议，即富空位的斜茂铁不一定限于超高压变质条件。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号