Helium and argon isotopic geochemistry of Jinding superlarge Pb-Zn deposit

The study results of He and Ar isotopes from fluid inclusions in pyrites formed during mineralization stage of Jinding superlarge Pb-Zn deposit in west Yunnan, China are reported. The data show that the⁴⁰Ar/³⁶Ar and³He/⁴He ratios of fluid inclusions are respectively in the range of 301. 7–385. 7 and 0. 03–0.06Ra, suggesting the oreforming fluid is a kind of air saturated meteoric groundwater. On the basis of research on coupled relationships among He, Ar, S and Pb isotopes, the evolution history of ore-forming fluid of the deposit can be summarized as (i) air saturated meteogenic groundwater infiltrated down and was heated→ (ii) leached S, C and radiogenic He, Ar from the basinal strata → (iii) leached Pb and Zn from mantle-derived igneous rocks located in the bottom of the basin→ (iv) ore-forming fluid ascended and formed the deposit. Due to this process, the isotope signatures of crustal radiogenic He, atmospheric Ar (with partial radiogenic⁴⁰Ar), crustal S and mantle-derived Pb remained in the ore-forming fluid. Project supported by A30 Project of the National Climbing Program of China and University of Manchester.     

扫描电子显微镜下放射虫化石制样方法的探讨

讨论了为获得放射虫化石的高质量的二次电子图像所采用的试样制备方法。通过多次试验,认为放射虫化石的表面导电处理应采用碳金双层镀膜法。在放射虫化石表面先蒸镀一层１０～２０ｎｍ厚的碳膜,然后根据放射虫化石的形态和表面结构的不同,溅射厚度不同的金膜;钟罩形、塔形放射虫化石的金膜厚度在６０～８０ｎｍ,带刺的球形放射虫化石的金膜厚度在８０～１４０ｎｍ,球形放射虫化石的金膜厚度在１４０～２００ｎｍ。     

哀牢山金矿带成矿流体稀土元素地球化学

本项研究测定了矿石、蚀变围岩和相应未蚀变岩石的稀土元素组成。通过对这些地质体稀土元素地球化学特征的对比研究发现,在成矿流体的演化过程中,镇沅和墨江两个金矿床成矿流体的稀土模式具明显的变化,而大坪金矿成矿流体的稀土模式则保持相对不变。因此,大坪金矿的稀土模式（轻稀土高度富集、弱负Ｅｕ异常和较强负Ｃｅ异常）可以代表初始成矿流体的稀土模式。研究表明,具有这种稀土模式的流式,可能是由地幔去气作用产生的地幔     

庐山运动

本文简述了庐山隆-滑构造的基本特征。在中元古代双桥山群底部的顺层韧变带中，把前人的断层构造砾或沉积成因的巨厚层状变质复成分砾岩，自上而下分离出三层砾：上部砾、中部砾、下部砾。其中上部砾为断层构造砾；中部砾不是砾，而是构造分泌物；下部砾为沉积底砾。在此基础上，同时参考研究区早元古代星子群与中元古代双桥山群构造、岩浆活动、变质作用等方面的差异，建立了“庐山运动”，其活动时间为2200～1800Ma，这可以与华北及华南其它地区同时期的构造运动相对比，但庐山运动的强度相对较弱，表现为以垂直隆升为特色的造陆运动，它曾使研究区早元古代晚期至少遭受过长达200Ma（1800～1600Ma）的风化、剥蚀作用。     

临沧锗矿床成因初探

本文根据临沧锗矿床中富锗煤与硅质岩的空间分布规律，富锗煤中黄铁矿的硫同位素组成，锗在矿化煤层中的品位变化规律以及硅质岩的地球化学特征，探讨了分散元素锗形成独立矿床的可能机制，研究结果表明，与矿化煤层互层的硅质岩为热水沉积成因，矿化煤层中的锗主要来自形成硅质岩的热水溶液，而这种热水溶液中的锗则主要由盆地基底的富锗花岗岩所提供。     

中期暴雨预报自动化系统

中期暴雨预报系统实现了从信息采集、预报制作到服务全过程自动化。中期暴雨预报方法主要有：环流分型相似预报、暴雨个例相似预报和中期暴雨预报专家系统，采用层次分析动态决策方法进行预报集成。该系统在业务预报中取得显著效果。     

The East Asian Monsoon Simulation with IAP AGCMs-A Composite Study

Ｔｈｅ　Ｅａｓｔ　Ａｓｉａｎ　Ｍｏｎｓｏｏｎ　Ｓｉｍｕｌａｔｉｏｎ　ｗｉｔｈ　ＩＡＰ　ＡＧＣＭｓ－Ａ　Ｃｏｍｐｏｓｉｔｅ　ＳｔｕｄｙＷａｎｇＨｕｉｊｕｎａｎｄＢｉＸｕｎｑｉａｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＡｔｍｏｓｐｈｅｒｉｃＰｈｙｓｉｃｓ（ＩＡＰ），...     

湖北松滋县洈水风景区的岩溶洞穴群

松滋县洈水风景区的洞穴群是一具有旅游、科学研究、考古和探险等综合价值的岩溶资源。本文初步，也是首次介绍了该洞穴群的地质背景、环境条件和发育特征，重点展示了新神洞内奇特壮观的瀑布、化学沉积物、惊险无比的洞道和洞水。     

The characteristics of volatile components and alkaline metasomatism in main skarn-type iron deposits in China and their role in ore formation

Skarns, ores and hydrothermally metasomatic rocks associated with some major skarn iron deposits in China contain abundant volatile components, such as F, Cl and H₂O. Alkaline (sodic or potassic) metasomatism is obviously evident in the magmatic and other alumo-silicate wall rocks. They may serve as important ore-searching indicators. In this paper, the probable source of iron fluids, transport forms of iron and conditions of precipitation of magnetite are also discussed. From the studies of major skarn iron deposits in China, the authors hold that volatile components, such as F, Cl, H₂O, etc., and alkaline (K, Na) metasomatism play a very important role in the formation of this type of iron deposits^{[1, 2, 3]}.