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通过1∶25万邦多区幅地质调查,在尼玛县西部拉舍—岷千日一带发现一套基性-中性-酸性-酸碱性火山岩岩石组合,其时代属古新世—始新世,新创建美苏组。描述了该组的分布、岩性、岩相、古生物及同位素年代特征,讨论了其形成的构造环境。
Through the 1: 25 Wanbang regional geological survey, a set of basic-neutral-acidic-acid-base volcanic rock assemblage was found in the Laxue-Minqianri area in the west of Nima County. Its age belonged to the Paleocene- World, the new creation of the United States and Soviet Union group. Described the distribution of the group, lithology, lithofacies, paleontology and isotopic dating characteristics, discussed the formation of the tectonic environment.