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今正值耄耋之年,投身地质已53载,在黔历42寒暑。贵州省在地层古生物、沉积改造矿床和喀斯特3个方面占优势,现笔者基于贵州省地质研究的几个认识就教于大家。 鲕铁石 笔者在研究四川宁南中奥陶世浅海泻湖沉积鲕铁石,和湖北、湖南、江西、广西、贵州、云南、四川的泥盆纪浅海相沉积鲕铁石发现,海水咸度大,浮力也大,鲕粒停留在水体中的时间长,有充足的时间发育,因而鲕拉多(70％～90％)、鲕粒颗粒大(0.5～2mm),鲕环也多(3～4最多20)。而四川綦江侏罗世湖相淡水沉积的鲕铁石,因水体是淡水,浮力小,鲕粒在水体中停留时间短,鲕粒少(2％),颗粒小(0.5～0.6mm),鲕环也少(1～2环),这种情况在全球相同。可以断定星生宙鲕铁石,其鲕粒的多少、大小及鲕环的多少均与沉积时水体咸度有关。
This is a time of staggering years, to join the geology has been 53, in the calendar 42 summer. Guizhou Province has three advantages in stratigraphic paleontology, sedimentary alteration, and karst. Nowadays, based on the knowledge of geological research in Guizhou Province, the author taught to everyone. The author of this paper studied the deposition of oolites in the middle Ordovician shallow sea lagoon in Ningnan, Sichuan, and the shallow Devonian sediments in Hubei, Hunan, Jiangxi, Guangxi, Guizhou, Yunnan and Sichuan. Large, oolitic stay in the water for a long time, there is sufficient time for development, which oolla more (70% to 90%), oolitic particles (0.5 ~ 2mm), oocysts are also more (3 to 4 up to 20 ). The oolite deposited in the Jurassic lacustrine sediments in the Qiongjiang River in Sichuan Province is characterized by its fresh water and low buoyancy, short residence time of ooids in water, less oolong (2%) and small particles (0.5 ~ 0.6mm) (1 ~ 2 ring), this situation is the same in the world. It can be concluded that the cosummoshaline oolites, the amount of their ooids, the size and the amount of oocysts are related to the salinity of sediments.