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加勒比海圣卢西亚岛最新喷发(<1百万年)的英安质熔岩属钙-碱性火山岩系。呈岩穹、岩钟状火山侵出体及猛烈喷发的浮岩相产出。根据矿物学及岩浆包裹体温压地球化学研究,英安质浮岩富含挥发组分,各类矿物斑晶在岩浆结晶分异晚期,于800-900℃、0.6-1.8千巴(P_(H_2O))条件下近于同时结晶析出;英安岩侵出体形成于猛烈爆发之后,气体大量逸出,挥发分含量较低,各类矿物斑晶于880℃、1千巴(P_(H_2O))条件下近于同时结晶析出。
The latest eruptive (<1 million year) British amphibolite in Saint Lucia, Caribbean, is a calc-alkaline volcanic series. Was rock dome, rock bell-shaped volcanic eruptions and violent eruption of the pluton production. According to the geothermographic and geochemical studies of mineralogy and magma inclusions, the amphibolite is rich in volatile components. Various types of mineralized plagioclasts occur at late stage of magma crystallization at 800-900 ℃ and 0.6-1.8 kPa (P_ (H_2O) )) Near the same time, the crystal precipitates at about the same time. After the violent explosion, the gas escapes in a large amount and the volatile content is low. All kinds of mineral plaque at 880 ℃ and 1 000 bar (P_ (H_2O) ) Near the same time under the conditions of crystallization.