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橄榄岩捕虏体中的流体(熔体)包裹体是研究地幔流体的最直接样品.应用流体包裹体显微测温学和激光拉曼技术,研究了山东临朐乔山地幔橄榄岩捕虏体中的各类流体(熔体)包裹体(早期富CO2流体包裹体和碳酸盐熔体包裹体,晚期富CO2流体包裹体和硅酸盐熔体包裹体).其中早期富CO2流体包裹体多为高密度纯CO2流体包裹体,部分含有石墨,CO,N2,菱镁矿等多种杂质.两期流体包裹体的最小捕获压力分别为1.42GPa和0.80GPa.由于碳酸盐熔体包裹体的寄主矿物主要是斜方辉石,据此推测碳酸盐熔体的形成可能与CO2流体和橄榄石、单斜辉石之间的反应有关.富CO2流体包裹体中杂质组分的多样性说明橄榄岩曾经经历与流体/熔体灌入有关的氧化还原反应.乔山地幔捕虏体的流体(熔体)包裹体证据说明该区陆下岩石圈地幔曾经被软流圈来源的富CO2流体/熔体所改造.
Fluid (melt) inclusions in the peridotite xenoliths are the most direct samples for the study of mantle fluids.Using fluid inclusions microscopic thermometry and laser Raman techniques, the effects of the olivary xenoliths (Inclusions of early CO2-rich fluid and carbonate melt inclusions, late-enriched CO2 fluid inclusions and silicate melt inclusions), of which the early CO2-rich fluid inclusions Most of the high-density pure CO2 fluid inclusions, some containing graphite, CO, N2, magnesite and other impurities.The minimum trap pressure of two fluid inclusions were 1.42GPa and 0.80GPa. As the carbonate melt wrapped The main host minerals are orthopyroxene, suggesting that the formation of carbonate melt may be related to the reaction between CO2 fluid and olivine and clinopyroxene.The abundance of impurities in CO2-rich fluid inclusions The peridotites have undergone the redox reactions associated with fluid / melt infiltration.The fluid (melt) inclusions of the Qiaoshan mantle xenoliths show evidence that the subtropic lithospheric mantle in the area was once rich in asthenospheric sources CO2 fluid / melt modified.