摘要
依据野外调查资料和室内化学分析,组建了阜平表壳岩的填图单元,单元分为阜平表壳岩上部和阜平表壳岩下部岩石。上部岩石原岩为沉积岩,属角闪岩相,无紫苏辉石,具有变余沉积层理和韵律构造,塑性变形差,从下到上可见片麻岩、浅粒岩、大理岩、斜长角闪岩的大韵律,角闪岩中还见小韵律;上部表壳岩的斜长角闪岩中SiO2、CaO、MgO的含量均高于下部1%左右。下部岩石原岩为火山岩,见变余火山杏仁状构造和枕状构造,为麻粒岩相,含紫苏辉石,塑性变形强烈,原岩构造保留较少。上下岩石无直接接触关系,从下部岩石中测得Rb-Sr全岩同位素年龄为2700～2900Ma,属太古代岩石。
Based on the field survey and indoor analysis,geological mapping unit for Fuping surface shell rocks is built, and the unit is divided into upper and lower parts. The upper part is of sedimentary rock and hornblende facies, but without hyperstbene. This part is featured with metamorphic deposit bedding,rhyme structure and hard to be molded.In this part upperward, there are gneiss, quartzofelspathic metamorphic rocks, marble and plagioclase-hornblenda rock. The contents of SiO2,CaO and MgO are all 1% higher respectively than that in the lower part. The origiral rock for the lower part is volcanic rock. It has the structure of metamorphic apricot kernel and pillow shaped. It is granulite facies. This part has hyperstbene, but easy to be molded. And orginal rock structure is less preserved. The two parts are not directly connected. The lower rocks' isotopo age is Rh-Sr 2 700～2 900 Ma, and the rocks are belong to the Archean.
出处
《河北林果研究》
2003年第3期225-229,共5页
Hebei Journal of Forestry and Orchard Research
关键词
阜平表壳岩
地质特征
原岩
麻粒岩相
Fuping surface shell rocks
geological feature
original rocks
granulite facies
