Linkam热台与热液金刚石压腔的熔体包裹体均一实验对比研究

A comparative study of applications of Linkam high temperature stage and Hydrothermal Diamond Anvil-Cell(HDAC) to homogenization experiment of melt inclusions

熔体包裹体均一实验是利用熔体包裹体研究原始岩浆演化和挥发分组成的基础。目前,开展包裹体均一温度实验的设备主要为Linkam系列的高温热台,而热液金刚石压腔（HDAC）是近年来才被应用到熔体包裹体均一实验中的。文章以义兴寨金矿床石英斑岩为例,对比研究了Linkam TS1500高温热台和HDAC在熔体包裹体均一实验应用中的优劣。利用Linkam TS1500高温热台得出熔体包裹体的均一温度范围为943-1190℃,而HDAC的测试结果为780-890℃。实验研究表明：HDAC能够在加热的同时提供接近熔体捕获条件的外压,更适于开展富挥发分的高内压熔体包裹体的均一实验。实验过程中得到的熔体包裹体固相初熔温度范围,可为估算义兴寨金矿床石英斑岩原始岩浆晚期结晶的压力提供依据。

Silicate-melt inclusions （MI） are natural samples of silicate melt entrapped in magmatic minerals, and homogenization experimentation is a prerequisite for the study of magma evolution and volatile contents. The microscope-mounted high temperature stage of heating at one atmosphere is the main homogenization equipment for MIs. Hydrothermal Diamond Anvil-Cell （HDAC） is an advanced experimental device applied to homogenization of melt inclusions in recent years which can provide proper external pressure at the time of heating. This paper compares the advantages and shortages of HDAC and Linkam TS1500 high temperature stage in the application of homogenization with the example of MIs in quartz porphyry from the Yixingzhai gold deposit. The melt inclusions in quartz phenocryst of the Yixingzhai gold deposit have homogenization temperatures （th） of 943-1190℃ by using Linkam TS1500 high temperature stage, and have homogenization temperatures of 780-890℃ by using HDAC. The results of HDAC are more credibly coincident with previous studies. Experimental results show that HDAC is more applicable to melt inclusions with high volatile contents compared with Linkam TS1500. The initial melting temperature of melt inclusions from this experiment can provide a basis for evaluating the latest crystallization pressure of primary magma of quartz porphyry in the Yixingzhai gold deposit.