讲座时间：2024年6月13日 15：00-17：00
讲座所在：地质楼204聚会室
主持人：吴嘉 副教授
专家先容：周义明，中国科学院深� ？蒲в牍こ萄芯克仄秆芯吭�。他于1945年出生于台湾，并在1968年获得台湾大学地质学学士学位，后于1974年取得美国约翰霍普金斯大学地球与行星科学系地球化学博士学位，并在原校及NASA各当两年博后。在1979年到2013年的34年间，他事情于美海内政部地质视察局（USGS），并于2013年入职中国科学院深� ？蒲в牍こ萄芯克�，建设深海极端情形模拟研究实验室。周义明研究的研究规模主要涵盖实验地球化学的手艺开发，地质流体、矿物及气体水合物（包括自然气水合物）在差别条件下的物理化学性子。他在Science、PANAS、Geology、EPSL、GPL、GCA等国际着名期刊上揭晓了200余篇论文，论文总引数凌驾8000次。
讲座内容：Dr. Zhou’s talk focus on how to control and measure Redox in hydrothermal experiments. In addition to pressure (P) and temperature (T), oxygen fugacity is another important extensive parameter in hydrothermal experiments simulating natural geological processes, especially for those related to the stabilities of minerals and metal-chloride complexes in aqueous fluids containing multivalence elements. The oxygen buffer and Shaw membrane techniques have been widely used in these experiments, but they can only be applied for experiments above 500?C, because at lower T’s the permeability of hydrogen through the osmotic membrane of H2 commonly used in these experiments (e.g., Pt or Ag-Pd alloys) is quite low, and therefore, equilibrium control of the redox state of the sample cannot be reached in a reasonable experimental duration (weeks or month). Fortunately, their ability to control the redox state of hydrothermal experiments at lower temperatures became possible, when fused silica was used as the osmotic membrane of H2. Furthermore, the exact redox state of an experimental system can be checked by using the hydrogen fugacity sensor, in the form of either Pt capsule or fused silica capillary capsule, at temperatures above or below 500?C, respectively. Also, it is now possible to determine the redox state of a sample in an optical cell, with either diamond or fused silica window, at elevated P-T conditions by using in situ quantitative Raman spectroscopic analysis method.
联系地点：北京市昌平区府学路18号，版权所有:公海彩船（北京），油气资源与工程天下重点实验室 邮编：102249 邮箱：prp@cup.edu.cn 联系电话：010-89733952，010-89731770
