Mangrove Mapping Using Landsat Imagery and Aerial Photographs: Kemaman District, Terengganu, Malaysia

Classification and distribution of mangrove vegetation are vital information for the proper development of a mangrove management plan. In this study, classification for the mangroves of the district of Kemaman were done using both 1 : 5000 aerial photographs and Landsat TM imageries. The coverage by aerial photographs is limited to the coastal and estuarine areas only. Thus, for areas further upstream of the aerial photo coverage, Landsat TM imageries were used. Analysis of aerial photographs and remote sensing images revealed that the mangroves of Kemaman could be classified into 14 different classes of vegetation. All the 14 classes were identified from areas covered by the aerial photographs. For areas covered by the Landsat images only 7 classes of vegetation were identified. The accuracy for aerial photograph and Landsat images are 91.2% and 87.8%, respectively. It can be concluded that although both techniques are useful in determining the mangrove vegetation classes, the large 1 : 5000 aerial photographs are more accurate and provided more detailed information comparatively.     

Fractionation of heavy metals and phosphorus in suspended sediments of the Yamuna river,India

The Yamuna river is the largest tributary of the Ganges river system. It originates in the Himalayas and flows through a varied geological terrain encompassing a large basin area. Metals Fe, Mn, Pb, Zn, Cu in different chemical fractions of suspended sediments such as exchangeable, carbonates, Fe–Mn oxides, organics and residual fractions were studied. Phosphorus associated with different chemical forms are discussed. The metals are mostly associated with residual fractions in the sediments followed by organics, Fe–Mn oxides, exhangeable and carbonates. Intensive use of chemical fertilizers and pesticides in agriculture in the basin affects the high inorganic phosphorus content in sediments.     

扬子型铜矿床矿物稀土元素地球化学

本文较系统研究了扬子型铜矿床中有代表性的菱铁矿、胶黄铁矿、黄铁矿、磁黄铁矿、磁铁矿、黄铜矿及部分脉石矿物的稀土元素组成及特征，总结了展状矿石中和矽卡岩矿石中矿物稀土元素组成的特点及二者之间存在的明显差别，从一个方面探索扬子型铜矿床的成因。     

安徽月山地区成岩-成矿作用关系研究

安徽月山地区的成岩-成矿作用在长江中下游地区具一定的典型性。本文论述了月山地区成岩-成矿的时空关系，探讨了岩浆岩及岩浆演化的成矿作用显示，并从成矿地球化学角度深入研究了闪长质岩浆（岩）对两类铜矿床成矿物质来源的贡献，从而确定了月山地区成岩-成矿作用的内在联系，评价了岩浆岩体的成矿潜力。     

Pearce型构造岩浆地球化学判别图评述——以玄武岩为例

自从六十年代板块构造的概念诞生以来,人们认识到有必要探讨古地理和古构造重建的方法.一段时期以来,很多学者(如Gilluly,1971)认为,岩浆作用与特定的大地构造环境紧密相关,不同的岩浆类型或火山岩系列产在一定的地壳环境,因而出现了许多运用主要或微量元素资料的分类体系或判别图.基于Irvine和Barager(1971)以及Miyashiro(1973)发表的主要元素图解能用来判别岩浆类型,而Pearce(1976)则介绍     

贵州水城青山铅锌矿床地球化学研究

通过对青山铅锌矿床矿石矿物、蚀变围岩、含矿层、辉绿岩的稀土元素、硫、碳、氧同位素及黔西北岩石地层中铅锌含量的研究，笔者认为，成矿金属并非源于岩浆岩，而源于深部的沉积岩，碳、硫分别源于碳酸盐岩和含矿地层的硫酸盐硫；大气降水经深循环再上升形成成矿介质水。     

四川锦屏山地区部分地层时代、玄武岩和花岗岩地球化学特征及构造环境

锦屏地区的地质研究程度较低，部分地层时代争议较大，玄武岩、花岗岩的性质、物质来源和构造环境等尚未深入研究。为了切实评价区域稳定性，基础地质研究十分重要。通过同位素年代学和孢粉分析，改盐塘组时代由中三叠世为早二叠世，皮罗渡桥西黑色砂页岩层为晚三叠世；稀土元素、过渡元素、微量元素和岩石化学分析表明，在金一箐断裂东西两侧分布的玄武岩为上地幔来源、不同于陆海环境的大陆裂谷喷发产物，花岗岩的分异和重熔程度不同，代表造山期挤压向造山期后拉张环境转化。上述结论为该区构造发展演化和区域稳定性评价、矿产资源寻找提供了重要基础资料。     

汞的环境地球化学研究进展

介绍了目前对环境样品中总汞及其各形态未的分析方法以及大气和水生生态系统中汞的研究进展，并指出，燃煤、汞齐法采金和人造水库等引起的环境汞污染问题以及汞在热带地区水生生态系统中的迁移转化规律等是目前的研究热点。     

福建崇安─宁化地区金锡多金属成矿地球化学研究

本文较系统地研究了成矿元素。稀土元素和铅、硫、氢、氧同位素以及流体包裹体等成矿地球化学特征。探讨了成矿物质和成矿溶液来源。研究结果表明．不同成因类型矿床的成矿物质和成矿溶液来源存在很大差异。     

贵州赤水宝元-元厚地区油气遥感信息分析

本文通过对赤水宝元－元厚地区地质背景的分析，研究影响油气遥感无价值信息的主要因素，确定排除油气遥感无价值信息的基本原则，从而决定油气遥感有用信息，并作出地质解释，说明油气遥感直接勘探是一种快速、经济、有效的方法。