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八三年九月,我院岩矿专业学生张泽明、袁晓江在黑龙江五大连池老黑山火山富钾基性熔岩流(石龙)中,发现了幔源超镁铁包体.这是在该区新期熔岩中首次找到的幔源包体.据薄片观察和电子探针分析,包体为尖晶石二辉橄榄岩,由镁橄榄石、铬透辉石、铬尖晶石(及斜方辉石)组成.包体在熔岩中分布零散,直径只有一到数厘米.初步估算超镁铁包体与寄主岩浆的平衡温度为1455℃、压力为29.4千巴.包体的初步研究成果已载入他们的毕业论文中.新期火山熔岩中幔源包体的发现.对于研究五大连池富钾基性岩浆的起源、演化和该地区上地幔的物质组成及热状态,有重要价值.
In September 1983, Zhang Zeming and Yuan Xiaojiang, rock-mine students in our college, discovered mantle-derived ultramafic inclusions in the potassium-rich basic lava flow (Shilong) of the Wudalianchi, Heilongjiang volcano, The mantle-derived inclusions were first found in lava, and the inclusions are spinel lherzolites, which are composed of forsterite, chrome diopside, chrome spinel (and orthopyroxene), as observed by flake observation and electron probe analysis The inclusions are scattered in the lava and have a diameter of only one to several centimeters.It is initially estimated that the equilibrium temperature of the ultramafic enclave and the host magma is 1455 ℃ and the pressure is 29.4 kPa.The preliminary results of inclusions have been loaded into their It is of great value to study the origin and evolution of potassium-rich mafic magma in the Wudalianchi Basin and its material composition and thermal state in the upper mantle.