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

单斜辉石和其他相中钾的高压晶体化学

• 批准号: 9314819
• 负责人: George Harlow
• 金额: $ 5.67万
• 依托单位: American Museum Natural History
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-15 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9314819&HistoricalAwards=false
• 关键词: Pressure; Crystal; Chemistry; Potassium; Clinopyroxene

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.

9314819 Harlow拟议研究的目标是（1）在5 - 15 GPa和1200- 1700 ℃条件下，实验研究单斜辉石中K吸收的极限和参数，（2）通过X射线衍射、TEM、ATEM证实K进入单斜辉石结构，并表征这种取代的结构特征，（3）进行具有差异方差的额外实验以产生共存的单斜辉石和其它相，以检验钾角闪石和富钾矿物;（4）开始检验Ba在钙质相中的吸收，作为K的二价类似物 这项研究与确定地幔中钾的潜在储集层有关，这对于理解地幔岩中钾的来源、地幔交代作用、俯冲作用引起的钾再循环以及地球的热收支至关重要。