摘要
狼洞沟地裂发生在浑江向斜的北西翼,由北西向主地裂带和北北东向地隆起带所组成。前者主要由成群成带展布的地裂缝,构成狼洞沟地裂的主体。走向N40°W,倾向南西,倾角50°以上,北东侧上升,南西侧下降,属高角度张性正断层性质。其升降幅度因地而异,一般在30～50cm,最大达1.1m。据野外调查资料,该地裂主要是在区域上北东—南西向主压应力作用下,北西向老断裂继承性所致,并与区域上的北东向压性浑江断裂带有着密切的成因联系。
The Early Triassic strata are well developed in the Yashan area, Nanlin County, Anhui Province, yielding abundant fossils such as conodonts, ammonites and bivalves. In the course of regional geological mapping at a scale of 1: 50000, 114 conodont samples were systematically collected. Through analysis and treatment, 600 conodont individuals were obtained. They respectively belong to seven genera and 21 species. Six assemblages or zones have been established in ascending order as follows. 1. Neogodolella planata assemblage 2. Neospathodus dieneri zone 3. Neospathodus maageni zone 4. Diplodolella magmdentata assemblage 5. Neospathodus homeri assemblage 6. Neospathodus anhuiensis-N, collinsoni assemblage These provide new evidence for the stratigraphic classification and correlation of the Early Triassic strata in the area. Besides, the geological section and conodont fauna in the area have also been analyzed.
出处
《中国区域地质》
CSCD
1992年第4期323-326,338-344+386+293,共4页
Regional Geology of China
