西藏埃永错东地区区调成果与展望

根据1∶5万区域地质调查有关规范和技术要求,在西藏埃永错东地区开展了1∶5万区域地质调查。通过对岩石地层、年代地层、生物地层、层序地层和事件地层等多重地层的划分与对比,重新厘定了古生代、中生代地层形成的时代和地层序列,并将特殊岩性层以非正式填图单位进行了表达;系统查明了区域地层、岩石、构造特征和成矿地质条件;首次在晚三叠世日干配错群中新识别出晚侏罗世—早白垩世雪山组;建立了测区二叠系多重地层划分方案;重新厘定了日干配错群基本层序和物质组成,将日干配错群进一步划分为2个组;新解体出31个侵入体、8个潜火山岩地质体和多条中酸性脉体;查明了区内断裂、褶皱等构造性质、时代、序次及空间配置关系,建立了测区构造格架和构造样式;新发现金属矿(化)点18处,找矿靶区2处。

Achievements and Prospects of Regional Geological Survey in the East Aiyongcuo Area,Tibet

Based on the 1:50 000 regional geological survey standard and technical requirements, the east Aiyongcuo regional geological survey project is carried out. The formation age and stratigraphic sequence of the Paleozoic and Mesozoic strata are redefined through multiple stratigraphic division and correlation for the lithostratigraphy, chronostratigraphy, biostratigraphy, sequence stratigraphy and event stratigraphy study. The special lithologic layers are showed by informal mapping unit. The regional strata, rocks, structural characteristics and ore-forming geological conditions of the area are found out. The achievements and progress of regional geological survey in east Aiyongcuo area include the followings: Xueshan Formation (late Jurassic-early Cretaceous) is identified for the first time in the late Triassic Riganpeicuo Group; Permian multiple stratigraphic classification scheme of this area is set up; basic sequence, material composition of Riganpeicuo Group is reclassified, and two formations in Riganpeicuo Group are established; about 31 intrusive bodies, 8 submarine volcanic geological body and a plurality of intermediate-acidic veins are disintegrated in this area; the quality, age, sequence and spatial configuration relationship for faults and folds in the area are found, the tectonic framework and tectonic style in the area are established; 18 ore occurrences and 2 prospecting target area are found in this area.