北京平原区地质剖面的初步建立-太古宙结晶基底和元古宙地层

Primary establishment of stratigraphic section in plain area of Beijing: Archean crystalline basement and Proterozoic strata

北京平原目前尚未建立系统的地质剖面。1867年庞培莱将北京西山分为3大系,1871年李希霍芬提出震旦系、划分12层。1922年葛利普将震旦系限定在前寒武系,1923年田奇镌将南口剖面划分为7个岩组,1934年高振西将震旦系3分(南口群、蓟县群、青白口群)。1976年乔秀夫3分青白口群(下马岭组、龙山组和景儿峪组),1980年汪长庆等将十三陵剖面分为4系12组,1991版《北京市区域地质志》将十三陵剖面分为3系12组。本文初步建立平原区地层表,详细描述太古宙结晶基底和元古宙地层剖面,在京南大兴区的榆垡(兴热-1井)和安定(兴热-2井)发现太古宙片麻岩,在京热-70井、京热-59井、京热-71井和京热-75井编录蓟县纪地层,利用亦庄小学钻孔厘定待建系下马岭组、青白口纪龙山组和景儿峪组。

Systematical geological section has not been established in Beijing plain area. Western Hills of Beijing were divided into3 systems by R. Pumpelly in 1867 and 12 layers by F. V. Richthofen in 1871. The Sinian strata were limited to pre-Cambrian by A.W. Grabau in 1922. The Nankou geological section was divided into 7 formations by Tian Qi-juan in 1923. The Sinian strata were divided into 3 groups which were Nankou Group, Jixian Group and Qingbaikou Group by Gao Zhen-xi in 1934. The Qingbaikou Group was divided into 3 formations of Xiamaling Formation, Longshan Formation and Jingeryu Frmation by Qiao Xiu-fu in 1976.The Ming Tombs geological section was divided into 4 systems and 12 formations by Wang Chang- qing in 1980. In 1991,‘Regional Geology of Beijing Municipality'divided Ming Tombs into 3 systems and 12 formations. This paper established a stratigraphic table in Beijing plain area and detailed Archean gneiss and Proterozoic strata. The Archean gneiss was discovered in Yufa'Xingre-1 Well'and Anding'Xingre-2 Well'. The Jixian system from Jingre-70 Well, Jingre-59 Well, Jingre-71 Well and Jingre- 75 Well was cataloged. The Xiamaling Formation to be established and Longshan Formation and Jingeryu Formation of Qingbaikou system were also cataloged at Yizhuang Primary School of South Beijing.