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前言对东昆仑地槽褶皱系形成的时代一直存在着不同认识。有人将其划分为加里东褶皱系,又有人划分为华力西褶皱系。就华力西褶皱系而言,也有几种不同的认识和划分方法。所以造成这些分歧,其关键是对纳赤台群时代的认识问题。东昆仑北缘布尔汉布达山一带出露的一套中级变质的绿片岩夹碳酸盐岩地层,五十年代初曾笼统地划为南山系。随着地质工作的发展,对其又进行了进一步划分。五十年代地质部六三二队将其划为奥陶志留系,称“纳赤台系”。文献中的纳赤台群含义比较混乱,除了上述中级变质绿片岩夹碳酸盐岩外,还包括了秀沟—西大滩以南至五道梁一带的砂板岩,统以 Pz_(1+2)表示之。青海省区域地质测量大队在区测中将西大滩以南的砂板岩划出,修订了纳赤台系含义,划归早古生代,称“纳赤台群”。
Preface There has been a different understanding of the formation of the East Kunlun Trough fold system. Some people divide it into the Caledonian folds, and others are divided into the Variscan folds. In the case of the Variscan folds, there are several different ways of understanding and dividing. Therefore, the key to creating these differences is the understanding of the age of the Nairtwai group. A set of intermediate metamorphic green-schist carbonate sandstones exposed in the Burhan section of the northern margin of East Kunlun Mountains was generally classified as a Nanshan line in the early 1950s. With the development of geological work, it has been further divided. Sixty-two two hundred and fifty geology department of the fifties will be classified as Ordovician detained, said “Nachi terrace ”. In the literature, the meaning of the Naji Tai group is rather confusing. In addition to the middle metamorphic green-schist carbonate sandstone, it also includes sand slate in the area from Xiugou-Xidatan to Wudaoliang, +2) said it. The regional geological survey unit of Qinghai Province set aside the sandstone to the south of Xida Beach in the area survey, revised the meaning of Nachi Taichung, and classified it into Early Paleozoic, which is called “Naji Tai Group”.