...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Deep mantle roots of the Zarnitsa kimberlite pipe, Siberian craton, Russia: Evidence for multistage polybaric interaction with mantle melts
【24h】

Deep mantle roots of the Zarnitsa kimberlite pipe, Siberian craton, Russia: Evidence for multistage polybaric interaction with mantle melts

机译：Zarnitsa Kimberlite管道的深层地幔根，西伯利亚Craton，俄罗斯：与地幔熔体的多级多级压边互动的证据

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

Zarnitsa kimberlite pipe in Central Yakutia contains pyrope garnets with Cr2O3 ranging from 9 to 19.3 wt% derived from the asthenospheric mantle. They show mostly S-shaped, inflected rare earth element (REE) patterns for dunitic and harzburgitic, lherzolitic and harzburgitic varieties and all are rich in high field strength elements (HFSE) due to reaction with protokimberlite melts. Lithospheric garnets (9 wt% Cr2O3) show a similar division into four groups but have more symmetric trace element patterns. Cr-diopsides suggest reactions with hydrous alkaline, protokimberlitic and primary (hydrous) partial melts. Cr-diopsides of metasomatic origin have inclined REE patterns and high LILE, U, Th and Zr concentrations. Four groups in REE of Ti-rich Cr-diopsides, and augites have asymmetric bell-like REE patterns and are HFSE-rich. Mg-ilmenites low in REE were formed within dunite conduits. Ilmenite derived from differentiated melts have inclined REE patterns with LREE similar to 100 x chondrite levels. Thermobarometry for dunites shows a 34 mWm(-2) geotherm with a HT branch (50 mWm(-2)) at 6-9 GPa, and a stepped HT geotherm with heated pyroxenite lenses at four levels from 6.5 to 3.5 GPa. Parental melts calculated with KDs suggest that augites and high-Cr garnets in the lithosphere base reacted with essentially carbonatitic melts while garnets from lower pressure show subduction peaks in U, Ba and Pb. The roots of the Zarnitsa pipe served to transfer large portions of deep (9 GPa) protokimberlite melts to the lithosphere. Smaller diamonds were dissolved due to the elevated oxidation state but in peripheral zones large diamonds could grow.
机译：Zarnitsa Kimberlite管道在雅库蒂亚中部含有带来Cr2O3的Pyrope Garnet，从9至19.3wt％源于哮喘的壁炉。它们显示Dunitic和Harzburgitic，Lherzolitic和Harzburgitic品种的S形，为Dunitic和Harzburgitic，Lorzolity和Harzburgitic品种的Ree），并且由于与Protokimberlite熔体的反应，所有这些都富含高场强元件（HFSE）。岩性装甲（＆ 9wt％CR2O3）显示了与四组类似的分裂，但具有更多对称的迹线元素图案。 Cr-Diopsides建议用含水碱，Protokimberlitic和初级（含水）部分熔体的反应。替代偏离的CR-DIOPSIDES具有倾斜的REE图案和高乳胶，U，TH和ZR浓度。富含Ti的Cr-Diopside的REE中的四组，奥斯特有不对称的铃铛般的REE图案，是富含HFSE的。在Dunite导管中形成咖啡中的Mg-Ilmenites。衍生自分化熔体的Ilmenite具有倾斜的REE图案，其与100×Chondrite水平类似。 Dunites的热能测定法显示34mWm（-2）地热，HT分支（＆ 50 mwm（-2）），在6-9个GPA，阶梯式HT地热，加热的冰象镜片，从6.5到3.5GPa的四个水平。用KDS计算的父母融化表明，岩石圈碱中的奥斯特和高Cr arnet与基本上的金色熔体反应，而来自较低压力的脉状型胶片，在U，Ba和Pb中的俯冲峰。 Zarnitsa管子的根部用于转移大部分深（＆ 9 gpa）protokimberlite融入岩石圈。由于升高的氧化态，但在外周区域中，较小的钻石溶解较小的钻石可以生长。

著录项

相似文献

  • 外文文献
  • 中文文献
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