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1930年譚錫畴和李春昱在四川西部(原西康省)进行地貭調查吋,曾将康定以西的一套黑灰色板岩、頁岩和砂岩,以及綠灰色板岩和砂岩的地层命名为“西康系”,并在雅江以西地区采得植物化石。化石多为Podozamites,故将“西康系”与香溪煤系对比,并将它划归侏罗紀(見譚錫畴、李春昱,1959:四川西康地貭志)。黄汲清在1945年所著的“中国主要地貭构造单位”一书中,曾列举了五点証据,否定“西康系”为侏罗紀地层,并认为主要属古生代。在1955年所出的“康藏路线地貭图”中,将“西康系”地层另命名为“札科系”,将其时代定为二迭紀。1958年甘孜地貭队将它划为石炭二迭紀,另外亦有人将它定为石炭紀。总之,这套地层的时代,长期以來是爭論不休的。
In 1930, Tan Hsin-chu and Li Chun-yu conducted a survey on the ground in western Sichuan (formerly Hikkatsu). They named a set of dark gray slate, shale and sandstone, and green-gray slate and sandstone formations to the west of Kangding as “Xikang System” , And plant fossils in the west of Yajiang. The fossils are mostly Podozamites. Therefore, the “Xikang System” is compared with the Xiangxi coal system and assigned to the Jurassic Period (see Tan Xichou, Li Chunyu, 1959: Chikang Di, Xikang, Sichuan). In his book “The Main Tectonics of China”, which was published in 1945, Huang Jiqing cited five evidences that denied that the “Xikang System” is a Jurassic period and that it is mainly Paleozoic. In the 1955 “Kham-Tibet Route Map”, the “Xikang Series” strata was renamed as “Zha Ke System”, setting its age as the Second Permian. In 1958, the Garze prefectures classified it as Permian-Permian, while others also defined it as Carboniferous. In short, the age of this formation has long been debated.