河北良岗阜平岩群岩性特征及原岩恢复探讨  

Discussion on Lithological Characteristics and Protolith Restoration of the Fuping Group in Lianggang Area,Hebei Province

作　　者：侯建军 董立帅 HOU Jian-jun;DONG Li-shuai(The Ninth Geological Brigade of Hebei Bureau of Geology and Mineral Exploration and Development,Xingtai 054000,China)

机构地区：[1]河北省地质矿产勘查开发局第九地质大队,河北邢台054000

出　　处：《河北地质大学学报》2023年第6期14-19,共6页Journal of Hebei Geo University

摘　　要：河北省良岗一带出露的变质表壳岩主要为阜平岩群元坊岩组及宋家口岩组。通过野外岩性组合特征并利用岩石化学及地球化学对其原岩恢复展开探讨。河北良岗一带元坊岩组整体为一套片麻岩夹斜长角闪岩的岩石组合,局部见磁铁石英岩,原岩建造属中性火山岩夹基性火山岩及陆源碎屑沉积岩建造。该岩组形成环境属于消减带岛弧—前陆盆地构造环境。宋家口岩组可分为三个岩段,一岩段为浅粒岩夹少量钙硅酸盐,二岩段以钙硅酸盐为主,三岩段主要为大理岩,顶部出现少量的变粒岩。原岩建造应为一套陆源碎屑岩-碳酸盐岩建造,其原岩应形成于岛弧-前陆盆地的构造环境。The metamorphic supracrustal rocks in Lianggang area of Hebei Province are mainly Yuanfangyan formation and Songjiakou formation of Fuping group.Based on the characteristics of lithology association in the field and the petrochemistry,geochemistry,the protolith restoration was discussed.The Yuanfangyan formation in Lianggang area of Hebei Province is a suite of gneisses with plagioclase-hornblende rocks,and magnetite quartzite is also found in some places.The protolith formation belongs to the intermediate volcanic rocks with basic volcanic rocks and terrestrial clastic sedimentary formation.The formation environment belongs to the subduction tectonic environment of island arc-foreland basin.The Songjiakou formation can be divided into three rock sections,one of which is composed of leucoleptite with a small amount of calc silicate,the other of which is composed mainly of calc silicate,and the third of which is composed mainly of marble with a small amount of metamorphic rock at the top.The protolith should be a suite of terrigenous clastic rock-carbonate rock formation,and are probably formed in the tectonic environment of island arc-foreland basin.

关 键 词：良岗 片麻岩 原岩恢复 构造环境 

分 类 号：P581[天文地球—岩石学]