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南非金伯利地区白垩纪金伯利岩携带的复合 (Polymict)橄榄岩捕掳体 (JJG1 41 4)中含有部分具环带结构的石榴石 .通过对这些环带状石榴石的电子探针、离子探针和激光氟化法释氧分析 ,揭示从中心到边缘石榴石存在系统的主、微量元素和氧同位素组成的变化 ,通常边部比中心富集Ca ,Ti,Cr,LREE ,Sr和Nb ,而亏损Mg ,Al和18O .反映这些石榴石曾受到过熔 /流体的改造 ,即为流体参与下地幔变形作用非平衡的产物 .
The Polymict peridotite entrapment (JJG1 41 4) carried by the Cretaceous kimberlite in the Kimberley region of South Africa contains some garnet with a zonal structure. By analyzing these ring-shaped garnet electron probe, ion probe And laser fluoridation of oxygen to reveal changes in the major, trace elements and oxygen isotopic compositions of the garnet presence system from the center to the periphery, usually with Ca, Ti, Cr, LREE, Sr, and Nb enriched in the edges more than the center Loss of Mg, Al, and 18O reflect that these garnets have been altered by melt / fluid, ie, a non-equilibrium product of mantle deformation under fluid participation.