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“铁洞沟组”地层系指陕西省兰田县坝源公社铁洞沟、北川一带位于熊耳群火山岩系之下的石岩英、绢云石英岩层而言,由陕西区测队所命名。 1966年出版的I-49-XⅣ(渭南幅)地质图及说明书中,将“铁洞沟组”地层置于下元古界底部,并认为与下伏太古界片麻岩系呈平行不整合接触;与上复熊耳群火山岩系为角度不整合接触。 1969年印刷的1∶50万东秦岭地质图和地层说明书中则将其划为上太古界。 1971年夏,笔者在金堆城——坝源一带做过短期踏勘,曾对“铁洞沟组”地层做过一些观
The “Tiegougou” strata refers to the Tieyinggou of Damyuan commune in Lantian County of Shaanxi Province and the rock quartzite of Shiyanying and Sericite below the volcano rock series of Xiong’ergou in Beichuan. In I-49-XIV (Weinan amplitude) geological map and specification published in 1966, the “Tiedonggou” stratum was placed at the bottom of the Proterozoic and was considered to be parallel unconformity with the underlying Archean gneiss Contact; and the restoration of the ear group of volcanic rocks for the angle of unconformity contact. The 1: 500000 East Qinling geological map and the stratum printed in 1969 will be classified as the Upper Archean. In the summer of 1971, I made a short-term reconnaissance in the Jinduicheng-Baoyuan area, and made some observations on the strata in the “Tiedonggou”