Improved Geological Interpretation Using Landsat TM Data in Lancang-Jinghong Area, Yunnan Province, China

Landsat TM digital spectral data of Lancang-Jinghong area (Yunnan Province) has been used for the purpose of geological interpretation. To meet this object, different image processing tech-niques including selected band color composites, principal component analysis and IHS decorrelation stretching are used to improve the discrimination of different lithologicai and structural features in the area. It was found that IHS decorrelation stretching images obtained from the transformation of false color composite 741 (in red, green and blue) provided the best results based on the original data. By combining the characteristics of images produced by different approaches and other canonically trans-formed images with available geological data and surface observations, the geological interpretation could be done with satisfactory degree of accuracy.     

云南喀斯特洞穴型旅游目的地生命周期调控机制研究

喀斯特洞穴是一种特殊的旅游资源，具有地域上的普遍性、共性大，独特性小、空间竞争替代性强、开发后资源本身变化大等方面的特征。同时，喀斯特洞穴又具有特殊的旅游生命周期，往往没有探查阶段和参与阶段，直接进入发展阶段。因此，以Butler旅游地生命周期理论为支撑，通过实地调查，对喀斯特洞穴型旅游目的地的生命周期进行详细研究，并结合典型案例分析，编制喀斯特洞穴旅游地生命周期曲线，分析影响曲线的因子，提出调控喀斯特洞穴旅游地生命周期的途径和方法，将对喀斯特洞穴型旅游目的地的开发具有重要的指导意义。     

滇东北渔户村组富铅锌矿成矿地质特征及找矿标志

渔户村组为滇东北富铅锌矿的重要产出层位。通过成型或基本成型的茂租，金沙厂，五星，乐红，大海等矿床，论述了滇东北渔户村组富铅锌矿的成矿地质特征，认为其与热水沉积成矿作用和后期改造作用有关，并总结了地质找矿标志。     

Aproposed Area for Study of Accessory Section and Point of Terrestrial Permian—Triassic Boundary

After the establishment of the global stratotype section and point (GSSP) of the Permian-Triassic boundary (PTB), the definition of the accessory section and point (ASP) of the terrestrial Permian-Triassic boundary (TPTB) is now on the agenda. However, all good TPTB sections so far known have the following shortcoming:(1) the exact TPTB horizon is difficult to define paleontologically with high-resolution, and (2) accurate correlation between marine and terrestrial PTBs in hard to attain. In order to enhance the understanding of the nature of the global life crisis in both the marine and terrestrial environments across the Paleozoic-Mesozoic transition, these shortcomings need to be addressed. In western Guizhou and eastern Yunnan, Southwest China, some fossiliferous PTB sections which include marine, paralic and terrestrial are well-developed, allowing bed-to-bed correlation of the PTB sequences. Fortunately, the marine PTB sequence in this area is almost the same as found at the Meishan Section, where the GSSP of the PTB is located, which may provide a reliable auxiliary marker for high-resolution demarcation of the TPTB. These features fund in estern Guizhou and eastern Yunnan make this area a good place to study the ASP of the TPTB, so we propose to study the ASP of the TPTB in this area.     

Geochemical Characteristics of Volcanic Rocks of the Laochang Ag Polymetallic Deposit,Lancang,Yunnan Province,China

In terms of major element, trace element and REE geochemical characteristics ofvolcanic rocks in the area studied and by making use of the TiO2-K2O-P2O5,The-Hf-Ta and Zr-Nb-Y trianglar diagrams and the environmental discrimination diagrams of incompatible ele-ment distribution pattems,the authors have drawn some conclusions that are different from those by previous workers.It is concluded that volcanic rocks in the Laochang Ag polymetallic deposit at Lancang,Yunnan belong to continental within-plate alkali basalts, and that their geotectonic setting seems to be at the northeastern margin of East Gondwana Land.     

云南白秧干净多金属成矿区构造特征及其控矿作用

通过区域地质构造，矿区构造特征分析，论述了云南白秧坪多金属成矿东矿带，西矿带的主要地质构造特征及其构造控矿作用，并探讨了区域构造导矿与成矿及其对成矿带的控制作用，小型褶皱及推覆构造对矿床的控制作用，次级断裂对矿体的控制作用，构造环境下岩石的屏蔽与容矿作用和构造环境中碳质水源及其成矿作用等问题。     

宾川小龙潭斑岩铜矿地质特征及找矿远景探讨

详细叙述了小龙潭斑岩铜矿成矿的岩性、构造和元素地球化学晕等重要资料 ,证明该地区存在有较好的斑岩铜矿成矿条件 ,并提出了找矿有利区段     

云南省五月雨量转折突变的研究

本文应用时间序列转折突点的检测方法，对云南省18个代表站1951年至1999年5月雨量的年际和年代际转折突变进行了初步研究，结果表明，云南5月降水不存在明显的年际转折突变，但存在明显的年代际转折突变；云南大部分地区5月雨量在50年代发生了少雨转折突变，60年代发生了多雨转折突变，70年代发生了少雨转折突变；80年代以后云南大部分地区5月雨量又发生一次多雨转折突变。     

The Recent Crustal Deformation on the Sichuan-Yunnan Rhombic Block Boundaries

Based on data from an across-fault survey along the sichuan-Yunnan rhombic block boundaries,the recent deformation characteristics on each fault have been analyzed.It was found that the rate of crustal deformation is slowing down along the northern segment and increasing along the southern segment.Each fault has different features of deformation.The horizontal deformation is mainly characterized by left-lateral strike-slip.The rate of vertical deformation is less than that of the horizontal dformation.The faults have the feature of upper wall uplifting alternated with descending.The anomaly changes of crustal deformation at some sites are closely related to the seismicities near the sites.