• 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 >Trace element zoning in pyroxenes from ODP Hole 735B gabbros: diffusive exchange or synkinematic crystal fractionation?
【24h】

Trace element zoning in pyroxenes from ODP Hole 735B gabbros: diffusive exchange or synkinematic crystal fractionation?

机译：ODP孔735B长辉石中的辉石中的痕量元素分区：扩散交换还是动力学晶体分离？

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

Major and trace element profiles of clino-pyroxene grains in oceanic gabbros from ODP Hole 735B have been investigated by a combined in situ analytical study with ion probe, and electron micro-probe. In contrast to the homogeneous major element compositions, trace elements (REE, Y, Cr, Sr, and Zr) show continuous core to rim zoning profiles. The observed trace element systematics in clinopyroxene cannot be explained by a simple diffusive exchange between melts and gabbros along grain boundaries. A simultaneous modification of the melt composition is required to generate the zoning, although Rayleigh fractional crystallization modelling could mimic the general shape of the profiles. Simultaneous metasomatism between the cumulate crystal and the porous melt during crystal accumulation is the most likely process to explain the zoning. Deformation during solidification of the crystal mush could have caused squeezing out of the incompatible element enriched residual melts (interstitial liquid). Migration of the melt along grain boundaries might carry these melt out of the system. This process named as synkinematic differentiation or differentiation by deformation (Natland and Dick in J Volcanol Geotherm Res 110(3-4):191-233, 2001) may act as an important magma evolution mechanism in the oceanic crust, at least at slow-spreading ridges.
机译：通过结合离子探针和电子微探针的原位分析研究，研究了来自ODP孔735B的海洋辉长岩中斜向辉石晶粒的主要和微量元素分布。与均质的主要元素组成相反，痕量元素（REE，Y，Cr，Sr和Zr）显示出连续的岩心到边缘分区轮廓。不能通过沿晶界的熔体和辉长岩之间的简单扩散交换来解释在斜ino中观察到的微量元素。尽管瑞利分级结晶模型可以模拟轮廓的一般形状，但需要同时修改熔体成分以产生分区。晶体累积过程中，累积晶体与多孔熔体之间同时发生交代作用是解释分区的最可能过程。结晶糊状物的凝固过程中的变形可能导致挤出了富含不相容元素的残留熔体（间隙液体）。熔体沿晶界的迁移可能会将这些熔体带出系统。这种被称为动运动学分化或通过形变分化的过程（Natland and Dick in J Volcanol Geotherm Res 110（3-4）：191-233，2001）可能是海洋地壳中重要的岩浆演化机制，至少在慢速作用下如此。蔓延的山脊。

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