蒙古国矿产资源丰富,但地质勘查程度低.为了探查扎马尔地区找矿潜力,在区内开展了1∶25000土壤地球化学测量工作.依据测量结果,从数理统计学的角度,应用因子分析、相关分析和聚类分析的方法,研究工作区元素地球化学特征.结果 表明工作区土壤成矿潜力较大的元素组合有2组,即Au-Ag-Hg和As-Sb,这些元素含量高,变异系数大,反映低温热液成矿作用.对土壤分析元素应用异常下限进行异常圈定,共圈出6个综合异常区,其中综合异常区HT2、HT4、HT6分布受构造控制明显,为下一步优选找矿远景区提供了依据.

Qaidam Basin, located at the large Mesozoic-Cenozoic sedimentary basin in north Qinghai-Tibet plateau, is one of the important exploration areas for oil and gas resources.After summarizing the research status of Jurassic strata at this basin, the author finds that there are still many different points of view in the basin property and structure type.The studies mainly focus on features of sedimentary facies and hydrocarbon source rock, but the researches in sequence, thickness and stretch of the strata sedimentation are few, just lingering on qualitative study.Sedimentary sequence of the strata and the sediments source tracing can objectively retrieve the orogenic evolution and uplifting type and regulation.Thus, through establishing the sedimentary sequence of Jurassic strata at northern Qaidam Basin, the structural activities of the neighboring orogenic belt at that time can be retrieved, which is a scientific and effective method for discussing the Mesozoic-Cenozoic structural evolution at northern Qaidam Basin.

Systematic analyses of Pb and S isotopes are conduct on the W-Cu-Mo-U ore deposits in the Ziyunshan Intrusive Rocks (ZIR), in order for better understanding of the evolution of large-scale ore-forming fluids. Sulfides from the ores are characterized byδ34SCDT = 1.2‰—21.1‰, with 1.0‰—3.0‰ for W-Cu-Mo metallogenesis and 21.1‰ for U metallogenesis, and have208Pb/204Pb =38.541—38.742 (averaging at 38.705),207Pb/204Pb=15.617—15.710 (averaging at 15.654), and206Pb/204Pb = 18.240—18.433 (averaging at 18.299). Wolframites have 208Pb/204Pb = 38.649—339.595 (averaging at 39.122),207Pb/204Pb = 15.542—15.828, (averaging at 15.685) and 206Pb/204Pb = 20.842—21.319 (averaging 21.081), and quartzes have208Pb/204Pb = 37.683,207Pb/204Pb = 15.602 and206Pb/204Pb = 20.442. The ZIR have208Pb/204Pb = 38.583—39.182 (averaging at 38.943),207Pb/204Pb = 15.635—15.683 (averaging at 15.657 ) and206Pb/204Pb = 18.714—19.276 (averaging at 18.937). These isotopic data suggest that the source materials of the ore deposits could not be solely derived from the ZIR. In combination with the literature Pb isotopic data for the volcanic rocks of the study area, we concluded that the metallogenic hydro-thermal fluids from ZIR and Yuhuashan volcanic rocks play important roles in the genesis of the W-Cu-Mo-U ore deposits.

通过对修水县莲花芯石英脉型Cu-Mo-W矿床的辉钼矿进行Re-Os同位素测年,获得的ω(普Os)为0.0083×10 9～0.1535×10-9,加权的平均年龄为(157.7±2.8) Ma,计算得到辉钼矿Re-Os等时线年龄为(158.6±2.0) Ma(MSWD=0.63),与加权平均年龄在误差范围内一致,可代表辉钼矿的形成年龄,成矿作用时代晚于赋矿围岩晋宁期黑云母花岗岩的成岩时代.对比区域成岩成矿作用时代,认为该矿床可能与燕山期花岗岩岩浆活动有关,是赣北大规模钨多金属成矿序列演化的产物之一,属于华南中生代第二次大规模成矿作用(165～135Ma)的产物.

Uranium deposits in XiangShan is the largest volcanic type uranium deposits of China,the geological prospecting and research work is comprehensive and mature regions,the prospecting work from the 1950s has been more than half a century,and put a lot of exploration work.The re search invested a lot of money and achieved fruitful results.Summarize its mining practice has positive significance for guide future mining research and production of its mining practice.

The crude polysaccharides of wild Natural Boletus were extracted by hot water and deposited by ethanol. DEAE Cellulose column chromatography was used for polysaccharides purification after the protein was removed by Seveg method,and four kinds of polysaccharides named as Nb-I,Nb-II,Nb-III and Nb-Ⅳ were separated. Infrared spectrum analysis showed that Nb-Ⅰis β-D-glucopyranose containing glucuronic acid,and Sepharose CL-4B method showed that molecular weight of NbI is 4.0×104. Both crude polysaccharides and Nb-Ⅰhave total antioxidation activity(T-AOC) ,and that of Nb-Ⅰis higher.