广东省湛江地区第四纪更新世地层   总被引：5，自引：1，他引：5  

梁俊平 《广东地质》1992,7(4):21-34

  相似文献   

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

Du Janguo  Liu Wenhui 《中国地球化学学报》1991,10(4):318-325

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.  相似文献   

广东黄岗蚀变花岗岩型金矿的发现及其地质意义     

王福山 《黄金地质》1991,(1)

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。  相似文献   

榍石的红外光谱及穆斯堡尔谱研究     

谷湘平  陈良青 《矿产与地质》1991,(1)

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.  相似文献   

广东中部倒春寒天气特点和天气形势     

陈嘉玲 《广东气象》1989,(1):8-11

  相似文献   

Geology,Geochemistry and Genesis of Yinyan Porphyry Tin Deposit     

朱正书  朱金初 《中国地球化学学报》1989,8(4):374-384

The Yinyan porphyry tin deposit is a blind deposit associated with a small granite porphyry stock.The petrology and geochemistry of the Yinyan granite porphyry suggest that it is genetically of the transfor-mation type,emplaced at the late stage of fractional crystallization within a high-level magma chamber.Ore-forming fluids are derived predominantly from the granitic magma and they interact with the wall rocks intensely when finding their way upwards through the granite porphyry.From the lower part of the porphyry upwards the following alteration zones can be distinguished(a)slightly altered granite porphyry (with weak potash feldspathization),(b)protolithionite-quartz greisenization zone,(c)to-paz-quartz greisenization zone,(d)senicite-quartz sericitization zone,and （e）silicification zone (quartz core at the surface).Tin mineralization is related to greisenization,especially to topaz-quartz greisenization.Rock and ore-forming temperatures and oxygen fugacities are estimated,respectively.There are significant differences in many aspects between the Yinyan porphyry tin deposit and volcan-ic-subvolcanic porphyry tin deposits.  相似文献   

广东电白地区的玻璃陨石（tektite）的初步报道     

窦成勋  张如柏 《地质论评》1989,35(5):419-422

玻璃陨石发现于电白县小良乡的冲积层中,呈黑色—沥青黑色,相对密度为2.34—2.37,玻璃—沥青光泽,条痕无色,摩氏硬度为6—6.5。在偏光镜下观察为均质体,油浸法测得折光率约为1.503～1.506(t=14℃)。陨石表面布满了大小不等、形状各异的气孔,陨石本身的形状为圆形、长柱状圆形、扁豆状等。陨石的化学成分(平均值):SiO_2 74.956,Al_2O_3 12.486,(FeO+Fe_2O_3)4.346,CaO 1.934,MgO 1.872,MnO 0.072,TiO_2 0.7,K_2O 2.588,Na_2O 0.806。  相似文献   

对珠江三角洲地区防震减灾工作战略重点的思考     

何熙平 《地震学刊》1996,(1):30-32

重新认识珠江三角洲的经济战略地位，确定珠江三角洲的震情和震害特点，调整广东省防震减灾的战略重点，提出了实现战略重点的三项保证措施，并根据珠江三角洲的实际情况，重点考虑工程防震和抗震，中心城市防震建设，地震速报及防震减灾宣传的问题。  相似文献   

惠东─连县地学断面的地壳结构及性质研究     

王祖伟  赵风清  金文山  王官福 《华东地质学院学报》1996,(2)

本文利用地球物理－地质地球化学相结合的研究方法，分析了惠东─连县地学断面的地球物理特征及其速度密度模型，探讨了断面地壳的物质组成、结构和深部地壳的形成时代，认为该断面地壳的物质组成以长英质为主，断面深部存在太古代地壳，断面的地壳分层主要由变质相相变产生，由麻粒岩相下地壳、高绿片岩相－角闪岩相中地壳，低绿片岩相及沉积盖层组成上地壳的三部分．  相似文献   

广东省主要行业经济效益的比较研究     

胡新艳 《热带地理》1996,16(4):357-361

本文利用１９９３年主要行业经济效益统计指标，运用因子分析，聚类分析方法对广东省１８个主要行业的经济效益进行比较分析，抽取３个主因子，根据主因子得分，将广东省主要行业划分为４种类型，并分析各种类型的优势及存在的不足，进而提出调整，扶持，引导和促进主要行业发展的具体措施。  相似文献