...
  • 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 >Kokchetavite: a new potassium-feldspar polymorph from the Kokchetav ultrahigh-pressure terrane
【24h】

Kokchetavite: a new potassium-feldspar polymorph from the Kokchetav ultrahigh-pressure terrane

机译：Kokchetavite：来自Kokchetav超高压地层的新型钾长石多晶型物

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

Kokchetavite, a new polymorph of K-feldspar (KAlSi3O8), has been identified as micrometer-size inclusions in clinopyroxene and garnet in a garnet-pyroxene rock from the Kokchetav ultrahigh-pressure terrane, Kazakhstan. Kokchetavite has a hexagonal structure with a =5.27(1) Å, c=7.82(1) Å, V=188.09 Å3, Z=1, and is found to be associated with phengite + α/β-cristobalite (or quartz) + siliceous glass ± phlogopite/titanite/calcite/zircon, occurring as multi-phase inclusions in clinopyroxene and garnet. It is concluded that kokchetavite could not be an exsolution phase in host minerals. Instead, it might be metastably precipitated from an infiltrated K-rich melt during rock exhumation. Alternatively, although less likely, kokchetavite might be derived from dehydration of K-cymrite, which, in turn, was formed at high pressures. In either case, kokchetavite is a metastable polymorph of K-feldspar.
机译：Kokchetavite是钾长石（KAlSi3 O8 ）的一种新的多晶型物，已被确定为哈萨克斯坦Kokchetav超高压地层的石榴石-辉石岩中斜长石和石榴石中微米级的包裹体。 Kokchetavite具有六边形结构，其结构为= 5.27（1）Å，c = 7.82（1）Å，V = 188.09Å3，Z = 1，并且被发现与辉石+α/β-方英石（或石英）+硅质玻璃±金云母/钛铁矿/方解石/锆石，以多相夹杂物形式存在于斜辉石和石榴石中。结论是，kokchetavite不可能是宿主矿物中的析出相。取而代之的是，它可能在岩石挖掘过程中从渗透的富K熔体中转移出来。另外，尽管可能性不大，但kokchetavite可能是由K-硫铁矿的脱水产生的，而K-硫铁矿的脱水又是在高压下形成的。无论哪种情况，kokchetavite都是钾长石的亚稳态多晶型物。

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