热液金刚石压腔外压对包裹体均一温度的影响

Effects of External Pressures on Homogenization Temperatures of Fluid Inclusions by Using Hydrothermal Diamond Anvil Cell

常压下通常用冷热台测定流体包裹体均一温度,然而因内压的存在使得包裹体在加热的过程中为非等容变化,较大的内压甚至可以使流体包裹体在测温过程中发生爆裂。本文利用热液金刚石压腔(HDAC),以水作为传压介质,通过施加一定的外压对利用高压釜合成的不同体系的合成流体包裹体样品和来自玉龙铜矿的H2O-CO_2体系的天然流体包裹体样品进行测温实验,来研究不同外压下的均一温度变化,结果显示随着外压的增大,包裹体均一温度降低,包裹体发生形变,体积变小。

The homogenization temperatures of fluid inclusions are usually measured in a heating-freezing stage at 1 atm pressure,however the inclusions are not isovolumic in the heating process due to the increase of internal pressure which could result in the decrepitation of some inclusions. In our study,experiments regarding effects on homogenization temperatures of fluid inclusions by various external pressures are conducted by using hydrothermal diamond anvil cell（ HDAC）with water as the pressure transmitting medium. Results show that homogenization temperatures and volumes of natural H2O-CO_2 fluid inclusions from Yulong copper deposit and those of various synthetic fluid inclusions,which were synthesized with a certain external pressure,are decreased with the increasing of the external pressure.