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西藏东部地区怒江上游两岸,广泛分布着一套巨厚的黑色板岩,李璞等(1955)命名为“沙丁板岩系”,岩性以板岩、砂岩为主,两者交互成层,时夹灰岩透镜体及少量火山岩等,大多轻微变质。根据雅安多到邦通之间找到的Cordaites和一些瓣鳃类化石,以及嘉黎南沟的六射珊瑚,认为时代应属中生代下部,并可能包括一部分古生代。后来,沙丁板岩又被认为与西康群相当(王文彬,1957;顾知微,1962);西藏的地质工作者,也常将其视为怒江上游地区三迭系的代表。但一直没有发现确切的三迭纪化石依据。
A set of huge thick black slate is widely distributed on both sides of the upper reaches of the Nujiang River in the eastern part of Tibet. Li Pu et al. (1955) named it the “Sardinian slate system.” The lithology is mainly composed of slate and sandstone, , When the limestone lens and a small amount of volcanic rocks, etc., most of the slight deterioration. According to the Cordaites and some petal fossils found between Ya’an and Bang Tung, and the six corals in Jialinan ditch, the era is believed to belong to the lower part of the Mesozoic and may include part of the Paleozoic. Sardinian slate was later considered to be comparable to Xikang (Wang Wenbin, 1957; Gu Zhwei, 1962). Geologists in Tibet also often view it as a representative of Triassic in the upper reaches of the Nu River. But has not found the exact basis of the Triassic fossils.