The phase boundary between CaSiO3 perovskite and Ca2SiO4 + CaSi2O5 determined by in situ X‐ray observations
The phase boundary between CaSiO3 perovskite and Ca2SiO4 + CaSi2O5 determined by in situ X‐ray observations
复制标题
DOI：
10.1029/2006gl025772
复制
发表时间：
2006-05
影响因子：
5.2
通讯作者：
Yuichiro Sueda;T. Irifune;A. Yamada;T. Inoue;Xi Liu;K. Funakoshi
中科院分区：
文献类型：
--
作者：
Yuichiro Sueda;T. Irifune;A. Yamada;T. Inoue;Xi Liu;K. Funakoshi
利用Kawai型多砧装置（KMA）结合同步辐射研究了CaSiO 3钙钛矿和Ca 2SiO 4钾长石+CaSi 2 O 5钛酸盐之间的相变。实验测得该相界为P（GPa）= 9.8（4）+ 0.0017（3）× T（°C），比激光加热金刚石对顶砧实验和热力学计算结果低2- 4GPa，但与KMA淬火实验结果一致。研究结果表明，最近在几内亚康康地区发现的金刚石包裹体可能来自240-360 km深度的上地幔。
The phase transition between CaSiO3 perovskite and Ca2SiO4 larnite + CaSi2O5 titanite has been investigated using a Kawai‐type multianvil apparatus (KMA) combined with synchrotron radiation. This phase boundary is located by our experiments as P (GPa) = 9.8(4) + 0.0017(3) × T (°C), which is 2–4 GPa lower than the most recent results using laser heated diamond anvil cell and those based on thermodynamic calculations, but is consistent with earlier studies based on quench experiments using KMA. The present results suggest some diamond inclusions recently found in Kankan distinct, Guinea, may originate from depth of 240–360 km in the upper mantle.