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在老挝万象平原钾镁盐矿勘查中,将古近系划分为班塔博组、塔贡组。班塔博组属盐上盖层,为一套红色陆源碎屑沉积,形成于河流环境;塔贡组为含盐地层,由下部膏盐层、上部陆源碎屑岩组成3个明显的沉积旋回,属咸化潟湖沉积。古近系中所含介形虫属Sinocypris-Cypris(Cristocypris)-Parailyocypris组合,轮藻属Peckichara-Obtusochara组合。这2个组的岩石地层、生物地层及年代地层,可与我国滇西地区的勐野井组、等黑组相对比。这2个组南延至老挝北汕平原、沙湾拿吉平原后,岩石地层、生物地层、年代地层特征无明显变化。
In the exploration of potassium-magnesium salt deposits in the Vientiane Plain in Laos, the Paleogene was divided into the Bantabo Formation and Tageng Formation. The Bantabo Formation belongs to the salt caprock and is a set of red terrigenous clastic sediments formed in a river environment. The Tarong Formation is a salt-bearing formation consisting of three distinct sedimentary cycles of lower gypsum salt and upper terrigenous clastic rocks , Is a salty lagoon deposition. Paleogene contained in the family of Ophiodera Sinocypris-Cypris (Cristocypris) -Parailyocypris combination, Pesticide Peckichara-Obtusochara combination. The rock formations, biostratigraphy and chronostratigraphy of the two groups can be compared with the Mengnoi Group and the other black groups in western Yunnan. After these two groups were extended to the North Shan Shan Plain and Shawananji Plain in Laos, there was no obvious change in the characteristics of lithostratigraphy, biostratigraphy and chronostratigraphy.