青藏高原1∶25万区域地质调查主要成果和进展综述(南区)

Primary results and progress of regional geological survey(1:250000):the south of Qinghai-Tibet Plateau

青藏高原南部1∶25万区域地质调查取得的丰硕成果,为进一步系统和深入地认识青藏高原地质作用过程奠定了坚实的基础。区域主要结合带和断裂带时空分布的查证取得重大进展,为进一步建立区域构造格架提供了基础资料;前寒武纪变质岩系中高压麻粒岩的发现和大量同位素年代学数据的获得,为探讨藏南基底的形成机制、折返过程提供了新资料;一些地层及大量古生物化石的发现和确定,为区域地层系统的建立、划分与对比提供了重要依据;一些岩浆岩岩石类型的发现及大量同位素年代学数据的获得,为建立区域岩浆岩的时空格架和演化过程提供了新资料;重要不整合接触关系和沉积相的确定,为区域构造-岩相古地理恢复和沉积盆地分析提供了基础资料;第四纪地质及新构造区调成果,为青藏高原隆升、环境演变和古大湖研究提供了丰富的基础资料;人文古迹、生态环境、旅游地质等方面取得众多进展,为青藏高原的生态环境、古人类文化研究和地方经济的发展提供了基础资料;矿产资源调查取得众多新发现,为开展重要成矿区(带)的矿产资源调查评价提供了基础信息和导向作用。

The plentiful results and progress from the new regional geological survey(1:250000)in the south of Qinghai-Tibet Plateau established the stable bases to realize and understand the geological process and principle of Qinghai-Tibet Plateau. The important progress of the spatio-temporal distributing about the regional primary junction belts and faults provided the basic geological information to set up further the geotectonic framework. The discover of high-press granulites and obtainment of lots of isotope chronology datum among Precambrian metamorphic rocks offered new information for discussing the formation mechanism and exhumation process of the metamorphic basement in the southern Tibet. The find and affirmation of some few strata and lots of fossils provided the evidence to establish, divide and contrast the regional stratigraphic system. The discovery of some few magmatic rock types and obtainment of a lot of isotope chronology datum offered new information for establishing the evolving process and spatio- temporal framework of the magmatic rocks. The find and affirmation of important unconformities and sedimentary facies offered the basic geological information for the sedimentary basin analysis and tectonic lithofacies paleogeography rebuilding. The results and progress of regional geological survey about Quaternary geology and neotectonic movement provided a great deal of basic geological information to investigate plateau uplift, environmental evolution and great paleolake. Some more progress of the ancient human activity relic, zoology environment and tour geology offered the basic information for investigating the zoology environment and ancient human civilization of Qinghai-Tibet Plateau and developing the district economy. Some more discovery of regional geological survey about the mineral resources offered the basic information and guide action for developing the mineral resources investigation and appraisal of important metallogenic regions and belts in Qinghai-Tibet Plateau.