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在四川木里与云南宁蒗交界的依吉地区,分布一套由云母片岩、石英片岩、结晶灰岩、变质石英砂岩、板岩组成的变质带(还有少许硬绿泥石、白云母及透闪石等变质矿物)。大致平行于无量河(水落河)呈北北东向展布。地形高峻,谷深坡陡,道路崎岖,加之人烟稀少,给地质调查带来困难,因工作程度的局限,统称为石炭系。 1977年,我队唐秉奕测制了地层剖面,笔者在依吉背斜的核部与翼部采集了牙形刺,为建立依吉群和确定其上覆地层的时代提供了古生物依据。文中所列牙形刺是董致中鉴定。
A set of metamorphic belt composed of micritian schist, quartz schist, crystalline limestone, metamorphic quartz sandstone and slate (and a little chlorite and muscovite and slate) are distributed in the Yiji area at the junction of Muli and Yunnan Ninglang. Tremolite and other metamorphic minerals). Roughly parallel to the immeasurable river (Shuihehe) was north-north-east distribution. Steep terrain, deep steep slopes, rugged roads, coupled with sparsely populated, geological survey to bring difficulties, due to the limitations of work, collectively referred to as the Carboniferous. In 1977, our team measured the stratigraphic profile of Tang Bingyi. The author collected conodonts in the core and wing of the Yiji anticline, which provided the paleontological evidence for the establishment of the Yiji Group and the identification of the overburden. Toothpick listed in the article is Dong Zhizhong identification.