辽宁弓长岭太古宙斜长角闪岩中微球粒之发现
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The Discovery of Microspherules in Archean Lamellar Plagioclase Amphibolite of Gongchangling Area,Liaoning Province
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    摘要:

    本文报道了辽宁弓长岭二矿区太古宙纹层状斜长角闪岩中微球粒之发现。微球粒一种呈暗色、不透明、有磁性;另一种为浅乳黄—棕黄色、透明—半透明、无磁性或弱磁性。它们多为玻璃质,强磁性者为磁铁矿。微球粒具气孔、瘤状、气泡塌陷、连体、凹坑等反映强塑性、高速运动、富挥发份、快速冷凝特征的多种表面和内部结构。其化学组成以SiO2、TFe、Al2O3和CaO为主。它们的形成可能与火山作用或陨石撞击作用有关。无论其成因如何,均表明:1)纹层状斜长角闪岩的原岩为基性凝灰岩;2)本区变质温压条件存在微区不均匀性。

    Abstract:

    The microspherules reported here are discovered in lamellar plagioclase amphibolite of the Gongchangling No. 2 Mine. The microspherules can be divided into two kinds: one is black, opaque, and with magnetism; the other is canary-citrine, transparent-semitransparent, and with weak or no magnetism.Most of them are glassy, but those with strong magnetism have become magnetite. The microspherules have many kinds of surface and inher textures such as vesicle, tubercle, bubble breakdown and intergrowth, indieating that they were formed under such cotiditions as high temperature, abundance of volatile components, strong plasticity, and rapid movement and cooling. The microspherules are compositionally charadterized by high contents and wide variation in SiO2 (2.7%--55.9%), Al2O3(1.7%--23.9%), TFeO(2.1%-92.6%) and CaO(0.5%--33.5%) .Based on the present study, it is thought that their formation might have been related either to volcanism or to meteorite impact. whi-chever origin the microspherules are of , the following important information can be drawn: (1) the original rocks of the lamellar plagioclase amphibolites are basic tuffs formed by resedimentation; (2) metamorphic temperaturepressure conditions are somewhat inhomogenous in the study area.

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万渝生,伍家善,杨明明,1993,辽宁弓长岭太古宙斜长角闪岩中微球粒之发现[J].岩石矿物学杂志,12(2):108~114. Wan Yusheng, Wu Jiashan, Yang Mingming Institute of Geology, Chinese Academy of Geological Sciences, Beijing Institute of Mineral Deposits, Chinese Academy of Geological Sciences,1993,The Discovery of Microspherules in Archean Lamellar Plagioclase Amphibolite of Gongchangling Area, Liaoning Province[J]. Acta Petrologica et Mineralogica,12(2):108~114.

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