河南鲁山地区中元古代兵马沟组的发现 及其地质意义

简述了鲁山地区的地质特征和兵马沟组的特征，分析了地壳演化历程，认为兵马沟组形成于河流三角洲环境， 并有向港湾到滨海过渡的迹象。燕山晚期三门峡-鲁山断裂带的向北逆冲推覆，导致兵马沟组呈倒转产状。通过对济 源、伊川、鲁山、舞钢分布的兵马沟组进行对比，认为兵马沟组沉积时具陆在北、海在南的古地理格局。兵马沟组与 上覆地层汝阳群云梦山组或五佛山群马鞍山组为角度不整合或平行不整合接触，期间发生过地壳抬升，兵马沟组不宜 归入汝阳群或五佛山群，应是一个独立的地层单位，这对完善华北乃至中国地层年代表具有重要意义。

The Discovery of the Middle Proterozoic Bingmagou Formation in Lushan County, Henan Province, and its significance

Geological characteristics of Lushan area and features of Bingmagou Formation as well as the crustal evolution process are discussed in this paper. On such a basis, the authors consider that Bingmagou Formation was formed in a river delta sedimentary environment and tended to become transitional to littoral facies. In the late Yanshanian period the northward obduction and napping of the Sanmenxia-Lushan fracture belt led the Bingmagou Formation to form overturn structure. Based on the correlation of Bingmagou Formation strata distributed in Jiyuan, Yichuan, Lushan and Wugang areas, the authors hold that there existed the paleogeographic framework that the land lay in the north and the sea lay in the south during the deposition of Bingmagou Formation. Bingmagou Formation is in angular unconformity contact with the overlying Yunmengshan Formation of Ruyang Group or in parallel unconformity contact with Maanshan Formation of Wufoshan Group, with a crustal uplift taking place between them. It is therefore not suitable to assign Bingmagou Formation to Ruyang or Wufoshan Group. Bingmashan Formation is an independent stratigraphic unit, thus it has important significance in perfecting the stratigraphic time scale of North China and even whole China.