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借助显微镜和扫描电镜、电子背散射衍射仪、电子探针、拉曼探针等现代仪器,对云南昭通巧家杏仁斑状玄武岩晶洞中灯笼状葡萄石聚集体的形貌和成因进行系统研究。葡萄石主要与水晶、绿帘石等矿物共生。葡萄石中普遍含有0.03%~0.06%的SrO,与其共生的绿帘石中SrO的含量(0.18%~1.70%)明显高于葡萄石;与葡萄石共生的水晶中气液包裹体主要成分为H_2O及少量CH_4。灯笼状聚集体由板柱状葡萄石单晶呈扇形密集分布,大多数晶粒的[010]方向垂直于灯笼状聚集体的横切面,[100]方向和[001]方向均平行于灯笼状葡萄石聚集体横切面且按一定的角度呈发散状。分析表明,葡萄石形成于低温(151.5℃~169.1℃)、低盐度(10.11%~11.81%)的热液环境中,成矿热液中少量甲烷等有机成分的存在,使葡萄石聚集体倾向于生长成整体具有更小比表面积的球形。晶洞中锶的来源与玄武岩层下的下二叠统(P1)富含锶的碳酸岩层密切相关。
Morphology and genesis of the lantern-like grapes aggregates in Qiaotong Qiaogan Almond-like basalts in Yunnan Zhaotong were studied systematically by means of microscopy, scanning electron microscopy, electron backscatter diffraction, electron probe and Raman probe. Grape stone and crystal, green curtain stone and other minerals symbiosis. Grape stone generally contains 0.03% ~ 0.06% of SrO, with the symbiotic epidote of SrO content (0.18% ~ 1.70%) was significantly higher than that of grape stone; and grape stone symbiotic crystal gas-liquid inclusions main component H_2O and a small amount of CH_4. The lantern-like aggregates are fan-shaped and densely distributed by platelet-shaped graphene single crystals. The [010] direction of most of the grains is perpendicular to the cross-section of the lantern-like aggregates. Both the directions [100] and [001] Stone aggregate cross-section and according to a certain angle was divergent. The analysis shows that the grape stone is formed in the hydrothermal environment of low temperature (151.5 ℃ ~ 169.1 ℃) and low salinity (10.11% ~ 11.81%), and the existence of a small amount of methane and other organic components in ore-forming hydrothermal fluids, Tend to grow into globes that have a smaller overall surface area as a whole. The source of strontium in the crystal cave is closely related to the Lower Permian (P1) strontium-rich carbonate rock under the basalt layer.