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

BassamFAIBassam 《中国地质大学学报(英文版)》2003,14(1):52-58

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.  相似文献   

云南喀斯特洞穴型旅游目的地生命周期调控机制研究   总被引：9，自引：0，他引：9  

李亚  任敬  赵福祥 《云南地理环境研究》2003,15(4):26-31

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。  相似文献   

高浑浊内河悬沙浓度的遥感估测:以中国云南金沙江下游支流为例     

S.C.Liew  吕喜玺  陈平  周跃  朱云梅 《山地学报》2003,21(3):378-379

山区土地利用和土地覆盖变化对水文过程的影响是人们关注的热点,因为它与洪水或干旱等严重的自然灾害有密切关系。一般认为,森林的清除会引起一个地区水沙量的明显增加。但是,要通过在地面进行观测来测算大河流域泥沙流量是十分困难的,特别在山区和人烟稀少地区更是如此。遥感手段为在这些地区收集相关资料和数据提供了一个有效的途径。在这个研究项目中,我们开发出了基于测量在可见光、近红外光波段的遥感反射系数的高浑浊内陆河流悬沙浓度(SSC)预测方法,并采用了中国云南金沙江下游河流SSC的地面观测值和河水反射光谱的数据进行了校准和检验。 我们在2002年6月龙川江的流量和输沙量比较高的时候开展了野外调查,使用了GER—1500手持光谱仪测量河水的反射光谱。SSC的地面观测值采用标准水样过滤法获取。结果表明,地面观测得到的SSC的变化范围为16～13 000g/m~3,其中间  相似文献   

滇东北渔户村组富铅锌矿成矿地质特征及找矿标志   总被引：3，自引：4，他引：3  

陈启良 《地质与勘探》2002,38(1):22-26

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。  相似文献   

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

PengYuanqiao  WangShangyan 《中国地质大学学报(英文版)》2002,13(2):157-162

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.  相似文献   

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

刘友梅  杨蔚华  陈多福 《中国地球化学学报》2002,21(3):266-273

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.  相似文献   

云南一批“矿娃娃”呼之欲出     

《浙江地质科技情报》2002,(4):34-35

  相似文献   

锑矿地电化学异常特征、成晕机制及找矿预测   总被引：8，自引：6，他引：8  

罗先熔  王桂琴  杜建波  胡云沪 《地质与勘探》2002,38(2):59-62

锑矿的地电化学Pb、Zn、As、Sb异常同步垂直出现在隐伏锑矿上 ,异常值的高低排列顺序是As〉Sb〉Zn〉Pb ,呈明显的电化学性异常标志。锑矿的电化学溶解试验结果表明 ,锑矿不但能产生电化学溶解 ,而且电化学溶解能力较强。找矿预测在云南木利、贵州半坡都取的了较好的效果。  相似文献   

云南白秧干净多金属成矿区构造特征及其控矿作用     

朱大岗  杨伟光等 《地质地球化学》2002,30(1):28-33

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。  相似文献   

滇中地区砂岩铜矿矿物分带特征及其成因意义   总被引：5，自引：0，他引：5  

陈根文  夏斌等 《地质地球化学》2002,30(1):41-45

滇中地区砂岩铜矿形成于紫色层向浅色层过渡的氧化还原界面附近，矿体具明显的矿物分带，从紫色层向浅色层，金属矿物依次按赤铁矿→辉铜矿→斑铜矿→黄铜矿→黄铁矿变化，这种分带有两种表现形式：一种为顺层分带，另一种为垂直分带，引起矿物分带的原因是由于具氧化性的含铜卤水和具还原性的含硫溶液相互反应，造成了不同矿物的先后沉淀。  相似文献