河南鲁山原“太华岩群”的重新厘定  

REDEFINITION OF THE TAIHUA GROUP,LUSHAN,HENAN

作　　者：沈其韩[1] 宋会侠[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《地层学杂志》2014年第1期1-7,共7页Journal of Stratigraphy

基　　金：国家自然科学基金(41203025);中国地质调查局工作项目(1212010811048)资助

摘　　要：出露于河南鲁山地区的原“太华岩群”在地质研究和新的同位素年代学测年新进展的基础上，已将其分解为古元古代变质表壳岩为主的上部岩系和以新一中太古代TTG岩系为主的下部岩系，二者之间为不整合接触，两套岩系地质特征很不相同，时间相隔5～7亿年，因此原“太华岩群”这一统一地质单位已不再适用，需重新厘定。建议以新一中太古代TTG岩系为主（70％）和伴生少量变质表壳岩（约30％）的下部岩系改称太华杂岩；上部的古元古代变质表壳岩系，因其标准剖面在鲁山，可以用“鲁山岩群”替代“原太华岩群上亚群”，这一群级地层单位曾被涂绍雄（1996）建议过。重新厘定后的地层名称，将不再出现命名上的混乱，也便于对比。Based on new geological research and isotopic ages, the originally defined Taihua Group can be divided into upper part of paleoproterozoic and lower part of Neoto Mesoarchean rock series. These two rock series are different in geological characteristics and isotopic age, and they are separated by an unconformity of 500N 700 Myr of missing time. Thus originally difined stratigraphic unit of the Taihua Group must be redefined. The lower rock series is chiefly composed of 70% TTG gneiss and about 30% metamorphic super crust rock. It is suggested that the lower rock series of the originally defined Taihua Group be renamed as the Taihua Complex, whereas the upper rock series be renamed as the ＂Lushan Group＂. This name was suggested by Tu Shaoxiong （1996）.

关 键 词：岩石地层单位 “太华岩群” TTG岩系 变质表壳岩 鲁山岩群 太华杂岩 古元古代 太古代 鲁山 河南 

分 类 号：P534.2[天文地球—古生物学与地层学] P534.3[天文地球—地质学]