• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemical geology >A REE-in-garnet-clinopyroxene thermobarometer for eclogites, granulites and garnet peridotites
【24h】

A REE-in-garnet-clinopyroxene thermobarometer for eclogites, granulites and garnet peridotites

机译：石榴石斜长岩REE气压计，用于榴辉岩，粒状和石榴石橄榄岩

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

A REE-in-garnet-clinopyroxene thermobarometer for eclogites, granulites, and garnet peridotites has been developed on the basis of the temperature, pressure and mineral composition dependent partitioning of rare earth elements (REEs) between garnet and clinopyroxene. This new thermobarometer is derived from the garnet-clinopyroxene REE partitioning model of Sun and Liang (2014) that was calibrated against experimentally determined garnet-melt and clinopyroxene-melt partitioning data. It makes use of a group of trace elements that have similar geochemical behaviors at magmatic and subsolidus conditions, and allows one to invert temperature and pressure simultaneously using a least squares method. Application of the REE-in-garnet-clinopyroxene thermobarometer to REE partitioning data from laboratory experiments and field samples (quartz-bearing, graphite-bearing, and diamond-bearing granulites and eclogites; and well-equilibrated mantle eclogite xenoliths) published in the literature validates its reliability at both magmatic and subsolidus conditions. Application of the new thermobarometer to eclogites, garnet granulites and peridotites from various tectonic settings reveals an intriguing observation: temperatures derived from the REE-based thermobarometer are consistently higher than those derived from the widely used Fe-Mg thermometer of Krogh (1988) for samples that experienced cooling, but systematically lower than temperatures derived from the Fe-Mg thermometer for samples from thermally perturbed tectonic settings. The temperature discrepancies are likely due to the relative differences in diffusion rates between trivalent REEs and divalent Fe-Mg in garnet and clinopyroxene. Temperatures derived from the REE-based thermometer are closely related to closure temperatures for samples that experienced cooling, but are likely equilibrium or apparent re-equilibration temperatures at an early stage of heating for samples from thermally perturbed tectonic environments. The REE-in-garnet-clinopyroxene thermobarometer can shed new light on thermal histories of mafic and ultramafic rocks. (c) 2014 Elsevier B.V. All rights reserved.
机译：石榴石-斜长石-石榴石-榴辉岩中的稀土元素在石榴石-斜辉石中的热压法是基于石榴石和斜辉石之间稀土元素（REE）的温度，压力和矿物成分的分配而开发的。这项新的温度晴雨表源自Sun和Liang（2014）的石榴石-斜茂铁REE分配模型，该模型针对实验确定的石榴石熔体和斜向吡咯-熔融物分配数据进行了校准。它利用一组在岩浆和亚固相线条件下具有相似地球化学行为的微量元素，并允许使用最小二乘法同时反转温度和压力。在文献中发表的REE-石榴石-斜茂铁热气压计在REE分区数据中的应用来自实验室实验和现场样本（石英，石墨，榴辉岩和榴辉岩;以及平衡良好的地幔榴辉岩异岩）验证了其在岩浆和近固相条件下的可靠性。新型热压计在各种构造背景下的榴辉岩，石榴石颗粒和橄榄岩中的应用显示了一个有趣的发现：基于REE的热压计得出的温度始终高于由Krogh（1988）广泛使用的Fe-Mg温度计得出的温度。经历了冷却，但是对于热扰动的构造环境中的样品，温度却系统地低于铁-镁温度计的温度。温度差异很可能是由于石榴石和斜发rox石中三价REE和二价Fe-Mg之间扩散速率的相对差异所致。从基于REE的温度计得出的温度与经历冷却的样品的关闭温度密切相关，但对于来自热扰动构造环境的样品，在加热的早期阶段很可能达到平衡或表观的重新平衡温度。石榴石-斜向辉石中的稀土元素可以为镁铁质和超镁铁质岩石的热历史提供新的启示。 （c）2014 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 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