| 2 | Mineralization at low temperature and its relation with organic substances——Taking Songxi Ag-Sb ore deposit in northeast Guangdong as an example显示文摘1 Geological setting and samples Songxi Ag-Sb ore deposit is located in the southern margin of Yongding-Mexian Paleozoic depressionof South China Caledonian orogenic belt, and the northern margin of Zhaigang Mesozoic volcanic basin,where a series of faults and folds formed with northwest tectonic directions. The sedimentary rocks arecomposed of Songling Group of low Jurassic system, Zhangping Group of middle Jurassic system and Quaternary System in which Songling Group can be divided into 3 lithostratigraphic units regionally, where thetwo of the units can be found there, i.e. the middle unit with gray-yellow quartz sandstone, fine sandstone and siltstone, and the upper with black shale and tuff, in which layered Ag-Sb ore bodies are deposited, and especially in the low part of quartz sandstone, siltstone, bioclastic limestone and the alteredbasalt are the main ore-bearing rocks. The ore bodies can be divided into two types of mineralization, i.e. bedded or bedded-like types and vein type. | XIAO Zhenyu~1, YANG Xiaoyong~2 and YANG Xueming~2 1. Guangdong Geol. Bureau, China Nonferrous Metals Exploration, Guangzhou 510080, China 2. Department of Earth and Space Sciences, University of Science & Technology of China, Hefei 230026, China | 1999 | Chinese Science Bulletin1999，44，S2： | 0 |
| 3 | REGIONAL GEOLOGICAL ASPECTS CONCERNING SAFETY OF WATER STORAGE显示文摘Dams and, particulary,large dams are structures with a risk potential and impacts on the environment. The impacts not only concern the immediate project area and its vicinity, but often the whole catchment area and the downstream valley. This is why regional aspects are important during design, investigation and operation. Regional geology,including all relevant geo-sciences, provides basic information for a safe and longtime operation of a project. | Lutz KRAPP, HE Ying-chen, JIN Kan-kun, Paraskevas PANTZARTZIS (l. Technical University of Aachen, Germany 52080 2. Hebei Institute of Architectural Science & Technology, Handan, 056038 3. Dip. Geol., Da rer nat.,Greece) | 2000 | 河北建筑科技学院学报2000，17，1： | 0 |
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