Remote Sensing Study of Gold Biogeochemical Effects in the Western Guangdong-Hainan Region——A Case Study of the Hetai Gold Deposit

The vegetation has been poisoned by gold in the western Guangdong-Hainan region. The gold content ofthe leaves there is as high as 10-1961 times the abundance, the chlorophyll content is 10%-30% lower thanthat of the vegetation in metamorphic terrains and 10%-20% higher than that in granite terrains, and thecarotenoid content is 10%-44% lower than the background value. The water content of leaves is 10% to 20%lower than the background value. The cells of leaves are deformed and broken. The leaf surface shows colourspots and becomes yellow or dark green. The spectral reflectance of the leaf surface is 5%-30% higher than thebackground value: the spectral shape has shifted 5-15 nm to the short wavelength. The gray scales of eanopyon images of Landsat TM and airborne imaging scanner (AIS) are 10%-100% higher than the backgroundvalues. On Landsat TM and AIS false colour images, plants poisoned by gold display a yellow color, whichdisinguishes them from background plants. According to the spectral and image features of goldbiogeochemical effects, the author has constructed a gold information system and expert prediction system,and thus two gold target areas and two gold prospect areas have been identified rapidly, economically andaccurately in the western Guangdong-Hainan region which is extensively covered by vegetation.     

香花岭及其邻区的岩浆岩研究取得新进展

本文根据1:50000香花岭幅综合方法提取的相关信息,在香花岭及其邻区共圈定了25个岩体含42个侵入体,建立了癞子岭、尖峰岭等10个单元,骑田岭、香花岭两个序列与印支、燕山两次构造岩浆作用期;并预测了香花岭、骑田岭地区的隐伏岩体及其顶面窿起区与凹陷区的识别标志。在此基础上,重新认识了香花岭矿田的控矿机制。     

重、磁数据处理和图象显示FORTRAN程序库

重、磁常规数据处理在地质上得到广泛应用,我们建立了一个标准的常规数据处理工具库:HKl.LIB,同时,在库中加入图形函数,使得能够使用FOR-TRAN语言编制绘图软件。     

淅川石煤钒矿提取技术的研究

石煤提钒技术关键是钒的氧化和转化。浙川石煤中钒主要有V~(3+)和V~(4+)形式存在,以类质同象取代粘土矿物二八面体中Al~(3+)。钒的价态分布研究表明,低温时有机质和黄铁矿决定了钒的价态,在370℃(风化样)或490℃(原样)V~(3+)全部氧化至V~(4+);高于800℃V~(4+)不再氧化至V~(5+),反应处于动态平衡,此时ηV~(5+)达91％。同时讨论了氯化钠在提钒过程中的氧化和转化作用,石煤钠盐氧化焙烧提钒的最佳条件:矿:盐=100:15,800℃,30分钟,η_培为67.4％。实验表明,焙烧气氛对钒转化有很大影响,氧化—氯化焙烧技术提高η_培6％。     

某些幔源矿物晶体中异常消光现象的显微喇曼谱研究

异常消光是一种在幔源晶体中常可观察到的物性改变现象,然而它与晶体的真实结构之间的内在联系却至今仍未被认识清楚。本项工作试图用一种灵敏的微区结构探测新技术——显微激光喇曼谱方法研究幔源晶体中由构造作用导致的异常消光现象的结构本质。实验结果说明:上地幔高温蠕变作用对橄榄石及辉石主要感应了晶体内微区晶轴取向的变化,还未能产生明显的结构相变;不同的异常消光现象反映晶轴扭转的单位大小不同,并主要依赖于矿物晶体本身的结构特性。     

赣东北元古代蛇绿岩Sm—Nd同位素年龄及地质意义

江南古陆东南缘赣东北弋阳—德兴—婺源一线有一条蛇绿岩带,普遍认为它是二个一级大地构造单元的分界线,形成于元古代。推断蛇绿混杂岩是元古代古洋壳俯冲时被挤上来的碎片;也有人认为它是中生代二大古陆之间的缝合线。Sm-Nd矿物等时线给出1034±16Ma(MSWD=1.0)的同位素年龄,它符合元古代缝合带的观点,而不利于中生代缝合带。     

黄淮海地区农村劳动力剩余与转移研究

黄淮海地区农村劳动力的转移历史以1978年为界分为前后两个阶段。劳动就业目前仍集中于农业,农业劳动力多为兼业性的。农村劳动力转移水平普遍较低,地域分异明显,农村劳动力剩余量较大。劳动力转移的基本措施包括促进经济总体增长,提高乡镇企业就业弹性、提高劳动力文化素质、完善小城镇和劳动力市场建设。