粤西河台金矿糜棱岩中的微观韧性剪切指向标志

粤西河台金矿是一种由糜棱岩带控制的金矿床,笔者在对该矿床控矿糜棱岩的显微构造进行系统研究的基础上,指出了云母鱼和长石碎斑系是两种较为可靠的微观韧性剪切指向标志,为今后同类型金矿床的构造研究提供了有益的参考。     

广东百年一遇特大洪涝与气象服务

1994年6月8～21日，广东连遭9403号强热带风暴、龙卷风、大暴雨、特大暴雨、特大洪涝的灾害．九洲江、北江、西江水位超过或接近百年一遍的特大水灾，灾害波及广东9市60个县，占全省面积2／3，死亡220人，157万人受洪水围困，直接经济损失146亿元。本文就今年这次百年一遍的特大洪涝概况、主要影响系统、气象服务三个部分作一介绍。1特大暴雨和特大洪涝概况6月8日到19日，粤西、粤北和粤西南，降雨量达400～600mm不等。最大降雨中心分布在廉江市、阳山县和恩平市，中心雨量分别为689、563、577mm。其特点是强度大、时间长、面积广，为历史同…     

对广东防洪减灾若干问题的思考

本文通过对１９９４年广东省两次特大洪水的分析研究，讨论了广东省防洪减灾的总体战略思想，防洪工程建设的方针，社会经济系统对防洪减灾要求的适应，城市防洪问题以及灾害监测预报系统的现代化问题。     

广东玉水-银屎富铜多金属矿带同位素地球化学找矿研究

玉水-银屎铜多金属矿带是粤东北重要的铜、铅锌、金、银等多金属成矿远景区（带）之一。已发现铜、铅锌、金、银、铁、锰等矿床、矿点多处，其中玉水铜矿、银屎铅锌矿是近几年发现并评价的富铜、铅锌中型矿床，在这两个矿床的外围还有若干矿点及异常区。本文应用铅、硫及碳氧同位素示踪，对玉水-银屎矿床及其外围若干矿点及远就（异常）区进行对比研究，在阐明矿床成因、物质来源、成矿时代、演化历史的基础上，总结已知矿床和矿点的同位素特征，提出找矿评价的稳定同位素标记，对远景区（异常区）进行找矿评价。     

Isotopic Geochemistry of Non—hydrocarbons in Natural Gases from the Sanshui Basin,Guangdong Province,China

This study is focused on geothermal heat flow and the origin of non-hydrocarbons in natural gases in terms of the isotope geochemical characteristics of Ar, He, CO₂ and N₂ in natural gases from the Sanshui Basin, Guangdong Province. China.³He/⁴He ratios are of (1.60-6.39) × 10^-6, and⁴⁰Ar/³⁶Ar ratios of 450–841. The carbon isotopic composition (δ_l3C PDB) of carbon dioxide ranges from -20‰ to -2‰. δ^l5N(air) ratios have a wider range of-57 ‰- +95 ‰. The isotope geochemical characteristics of non-hydrocarbons indicate that He, Ar and N₂ in the gas reservoirs enriched in non-hydrocarbons were derived largely from the upper mantle. Non-hydrocarbons in gaseous hydrocarbon reservoirs consist mainly of crustal radiogenic He and⁴⁰Ar and some mantle-derived He and Ar, as well as of¹³C-depleted carbon dioxide and nitrogen generated as a result of thermal decomposition of organic matter in strata. Carbon dioxide enriched in¹³C was derived largely from carbonate rocks and partially from the lower crust and upper mantle. Based on the relationship between geothermal heat flow (Q) and³He/⁴ He ratio in natural gases, the Q values for the area studied have been calculated. Similar Q values are reported from the upper mantle uplift area (77 mWm^-2) in Huabei and the Tancheng-Lujiang Rift Zone (88 mWm^-2). More than 60 percent of geothermal heat flow in the Sanshui Basin may have been derived from the upper mantle. The project is financially supported by the National Natural Science Foundation of China.     

广东黄岗蚀变花岗岩型金矿的发现及其地质意义

黄岗蚀变花岗岩型金矿,位于吴川—四会断裂带西侧,产于加里东期粗粒花岗岩体的边部,受北西向压性断裂的控制,矿体产于绿帘石化及钾化花岗岩中,呈不规则状及扁豆状产出,主要组分以金为主。它的发现对于寻找新的靶区,具有十分重要的意义。     

榍石的红外光谱及穆斯堡尔谱研究

本文描述了花岗岩中榍石的矿物学特征,对其红外光谱与金红石红外光谱对比研究,获得某些谱带的归属,并给出了群论分析;对其穆斯堡尔谱Fe~(3-)的两组对线的归属从结构、成分上进行了讨论.