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地壳岩石的失水熔融实验 被引量:8

EXPERIMENTAL RESEARCH ON WATER LOSS MELTING OF CRUSTAL ROCKS
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摘要 以岩石粉末试样的熔融实验为基础的 Q Ab Or An H2 O 体系的相关系表明,地壳岩石的熔融作用遵循矿物相消失所制约的固 液相平衡规律。然而,地壳岩石块状样品开放体系的熔融作用,其熔融机制、矿物相转变、初熔液相成分、残余固相等方面,均与地壳岩石封闭体系的熔融作用有很大差别。石英闪长岩开放体系的熔融实验表明,岩石的熔融首先从含水矿物的脱水熔融开始,从而熔体成分由基性逐渐转变为中酸性,残余固相趋于超酸性。这一实验结果对大陆地区岩浆起源和深部地壳物质组成的研究可能有新的启示。 The phase relationships of QAbOrAnH 2O system in the rockpowder melting experiment indicate that the melting process of the crustal rocks observes the solidliquid equilibrium rule constrained by the mineralphase disappearance.In the open and massive melting experimental system, however, the melting process of the crustal rocks has great differences in melting mechanism, mineralphase transition, the initial melting phase composition, the residual solid phase, etc from close melting system. The open and massive melting experiment on quartz diorite shows that the initial melting in the rock commences from the dehydration melting of the hydrousminerals, and experiences two melting stages i.e. decomposition melting stage and congruent melting stage. Hornblendes are at first tranferred into olivines (Fo=50%~57%) and a little magnetites, with the yellowcolored, calciumand ironriching melts. And then, biotites are transferred into olivines (Fo=63%~69%) and magnetites, with the violetcolored, alkalisand aluminumriching melts. Finally, plagioclase and quartz begin to melt. As melting increases, the evolutional sequences of the melting compositions are from basic to intermidiate and acid, from potasiumriching to sodiumriching, and from superalkali to alkali and subalkali, and the rock evolves from alkali basalt to trachyte and dacite. This experimental conclusion is of great significance to understanding of the continental magma origins and the deep crust compositions.
出处 《长春科技大学学报》 CSCD 1999年第3期209-214,共6页 Journal of Changchun University of Science and Technology
基金 国家自然科学基金 (中- 韩国际合作)项目
关键词 石英闪长岩 开放体系 失水熔融 地壳岩石 quartz diorite, open system, dehydration melting
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