HYDROTHERMAL STUDIES IN A NEW DIAMOND-ANVIL CELL UP TO 10 GPA AND FROM - 190-DEGREES-C TO 1200-DEGREES-C

被引：33

作者：

BASSETT, WA

SHEN, AH

BUCKNUM, M

CHOU, IM

机构：

[1] Department of Geological Sciences, Cornell University, Ithaca, 14853, New York, Snee Hall

[2] 959 National Center, U.S. Geological Survey, Reston, 22092, Virginia

来源：

PURE AND APPLIED GEOPHYSICS | 1993年 / 141卷 / 2-4期

关键词：

PRESSURE; TEMPERATURE; HYDROTHERMAL; H2O; EQUATION OF STATE; DIAMOND ANVIL CELL;

D O I：

10.1007/BF00998341

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The new hydrothermal diamond anvil cell (HDAC) has been designed for optical microscopy and X-ray diffraction at pressures up to 10 GPa and temperatures between -190-degrees-C and 1200-degrees-C. Laser light reflected from the top and bottom anvil faces and the top and bottom solid sample faces produce interference fringes that provide a very sensitive means of monitoring the volume of sample chamber and for observing volume and refractive index changes in solid samples due to transitions and reactions. Synchrotron radiation has been used to make X-ray diffraction patterns of samples under hydrothermal conditions. Individual heaters and individual thermocouples provide temperature control with an accuracy of +/-0.5-degrees-C. Liquid nitrogen directly introduced into the HDAC has been used to reduce the sample temperature to -190-degrees-C. The alpha - beta phase boundary of quartz has been used to calculate the transition pressures from measured transition temperatures. With this method we have redetermined 5 isochores of H2O up to 850-degrees-C and 1.2 GPa at which the solution rate of the quartz became so rapid that the quartz dissolved completely before the alpha-beta transition could be observed. When silica solutions were cooled, opal spherules and rods formed.

引用

页码：487 / 495

页数：9

共 8 条

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