High-Pressure Crystal Chemistry of Potassium in Clinopyroxene and Other Phases

9314819.本研究的目标是：(1)从实验上检验5-15 Gpa和1200-1700oC范围内单斜辉石吸收钾的极限和参数；(2)通过X射线衍射、透射电子显微镜、电子显微镜证实K进入单斜辉石结构，并表征这种替代的结构特征；(3)进行不同方差的额外实验，以产生共存的单斜辉石和其他相，以检验钾角闪石和富钾矿物；以及(4)开始研究钙相中的吸收，作为钾的二价类似物。建议的研究与确定地幔中钾的潜在储量有关这对于理解地幔岩石中钾的来源、地幔交代作用、俯冲作用下的钾循环以及地球的热收支是至关重要的。

9314819 Harlow The goals of the proposed research are (1) to examine experimentally the limits and parameters of K uptake in clinopyroxenes from 5 to 15 GPa and 1200-1700oC, (2) to verify by x-ray diffraction, TEM, ATEM that K enters the clinopyroxene structure and to characterize the structural characteristics of this substitution, (3) to conduct additional experiments with difference variance to produce coexisting clinopyroxene and other phases in order to examine K-amphiboles and K-rich minerals, and (4) to begin to examine Ba uptake in calcic phases, as a divalent analogue of K The proposed study has relevance for determining potential reservoirs of K in the mantle, which is central to understanding the source of K in mantle- derived rocks, mantle metasomatism, K recycling by subduction, and the heat budget of the Earth.