高温高压下含水玄武岩熔体的波速理论研究

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中图分类号：TB332 文献标志码：A 文章编号：2095-2945（2025）31-0061-04

Abstract：Comparedtominerals，acousticwavepropagationinbasaltmeltsisafectedbyloosestructureandintermolecular distance，anditswavevelocityisusuallylowespeciallathighpressuresStudyingitswavevelocitycharacteristicsisofgreat significanceforunderstandingthestructureoftecrustanduppermantle.Inthisstudy，byintegratingBilluinspetralaalysis technologyanddiamondanvildevice，acomprehensivestudywascariedoutontheelasticwavevelocitycharacteristics， mechanicalresponselawsanddensitydistibutionevolutionmodelsofbasaltmeltedsystemsunderextremetemperatureand presureconditions.Usinghigh-temperatureandhigh-pressurein-situtestingmethods，quantitativeanalysisofmeltelastic parameters，mechanicalbehaviorcharacteristicsandmaterialstatechangeswasrealized.Theexperimentalresultsshowthatthe second-orderphasetransformationoccursinthebasaltmeltatabout1OGPa，andthephasetransformationpressurepointisslightly advancedwiththeincreaseof temperature.Theelasticmoduluschangessignificantlyatthephasetransitionpoint，whilethedensity increasesmonotonicallywith presurewithoutsuddenchange.Theresearchresultsrevealthestructuralphasetransitionmechanism ofbasaltmeltsunderhightemperatureandhighpresure.Thisstudyhelpsexplaintheformationmechanismofthelow-velocity layerof seismic waves inside theearth，andthenreveals thephysical stateand dynamicprocesses inside theearth.

Keywords：basalt melt;high temperatureandhigh pressure; wavevelocity;Pwave;Swave;deep earth;seismic wave

1 材料与方法

1.1 材料准备

含水玄武岩熔体先前的研究是以常温高压的方式研究，利用热膨胀实验来计算密度，然而热膨胀实验误差较大难以获得精准的数据[1-3]。（剩余5141字）