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引言本文系我队1960—1964年期间集体劳动成果的一部分。青海东部地区,在上述期间通过J-47-ⅩⅩⅩ(湟源幅)、J-47-ⅩⅩⅩⅥ(西宁幅)及J-48-ⅩⅩⅪ(乐都幅)等三幅图1∶20万区域地质测量,对地层、构造、矿产及侵入岩等取得了较系统的资料。对区域地质构造特征的认识及其研究程度大大的提高了一步,其中尤以地层方面所获得的成果更为重要。在许多时代地层中查清了接触关系,建立了可靠的地层剖面,取得了足够的化石依据,从根本上改变了笼统的“南山系”的划分法。特别是拉脊山的寒武纪、奥陶纪地层的发现,不论对今后本区普查找矿的实践及地质理论的研究都具有重要意义。为了适应上述三幅图的出版,对本区提出了地方性地层命名方案,呈报全
Introduction This article is part of the collective labor effort of our team during the period 1960-1964. In the eastern part of Qinghai, geological maps of 1: 200,000 areas, including J-47-XXX (Xinyuan), J-47-XXXVI (Xining) and J-48-XXXI , Made more systematic information on the strata, structure, minerals and intrusive rocks. The understanding of the regional geological tectonics and the degree of its research have been greatly improved. Among them, the achievements obtained especially in stratigraphy are even more important. In many times the strata have identified the contact relationship, established a reliable stratigraphic profile, obtained sufficient fossil basis and fundamentally changed the division of the general “Nanshan system.” Especially in the Cambrian of Lajishan, the discovery of Ordovician strata is of great significance both for the practice of prospecting prospecting in this area and for the study of geological theory. In order to adapt to the publication of the above three maps, proposed a local stratigraphic naming scheme in this area,