广西金牙金矿床形成条件浅析   总被引：3，自引：0，他引：3  

李福春 《矿产与地质》1992,6(1):35-42

文章分析了与金牙金矿矿床形成有关的岩性、构造和岩浆岩;探讨了金的来源、活化条件和迁移形式;利用地质地球化学热力学计算了成矿的物理化学参数。  相似文献   

湘中地区二叠纪镁质粘土初步研究成果     

钱惠林 《湖南地质》1992,11(3):225-230

湘中地区几个主要晚古生代向斜内,二叠系茅口组底部的各种镁质粘土岩分布广泛。在湘潭、湘乡一带该层位主要为海泡石粘土岩,而娄底往西到新化一带变为以蒙皂石族为主的粘土岩。它们对研究该区的沉积环境具有指相作用,并具找矿意义。  相似文献   

A Comparative Study of Numercial Solution of PDE inGeosciences     

Zhang Hongren Ministry of Geology  Mineral Resources  Beijing 《《地质学报》英文版》1994,68(1):83-93

A number of phenomena and processes in geosciences can be summarized by second order partial differential equations. The major numerical methods for their solution include the classical finite difference method and the finite element method newly developed in the last two or three decades. Since 1977 the author has proved that for the Laplace and Poisson equations, these two methods are identical and are different only in the process of formulation. For transient problems, such as heat conduction in the earth and the groundwater and oil-gas unsteady flow in porous media, there are some differences in resulting linear algebraic euqations. In general, two methods give similar results, but when the time step is decreased to some extent, the resulting algebraic equation will be consistent with the anti-heat conduction equation rather than the original heat conduction equation. This is the reason why unrealistic potentials are produced by the finite element method. Such a problem can be overcome by using the  相似文献   

新疆北部前寒武系划分和对比   总被引：4，自引：0，他引：4  

彭昌文  高振家  陆松年 《新疆地质》1991,(4)

库鲁克塔格是新疆北部前寒武系分布较广,地层层序相对完整的地区.作者以库鲁克塔格为地层模型区,以同位素第龄为格架,初步确定了本区群级地层单元的界线及归属.在岩石地层、生物地层、化学地层等各种方法相互印证的基础上,建立并完善了前寒武纪的地层层序.  相似文献   

东海新生代构造运动对比   总被引：1，自引：0，他引：1  

陈颐亨 《上海国土资源》1988,(2)

东海面积大、构造复杂,不同构造单元的发展史有一定差异,因而与沉积和构造圈闭发育有关的地壳运动时代、幕次的性质和表现形式的对比就为人们所关注,更主要的是它们对矿产的形成,特别是油气的聚集息息相关。为此作者据国内外有关东海的地质和地球物理资料,从生物地层学、地震地层学、同位素测年和变质期,以及岩浆活动诸方面对之进行了评述与对比,并特别强调了早第三纪末玉泉运动和中新世末龙井运动对东海油气田形成的重要意义。  相似文献   

钾锶矾在我国的首次发现及其找钾意义     

莫珉 《矿物学报》1987,(2)

发现于四川农乐的钾锶矾,晶体发育完好,(000)解理完整,属于三方晶系,空间群R3m,一轴晶,负光性,Ne=1.549±0.001,No=1.572±0.001。钾锶矾在盐矿床中是后生矿物,其出现可以作为寻找可溶性钾盐矿床的标志。  相似文献   

Isotope geochronological study of Late Palaeozoic granitic rocks in the Nanling Region,South China     

Laboratory of Isotope Geology  Yichang Institute of Geology  Mineral Resources  the Ministry of Geology  China 《中国地球化学学报》1982,1(2):159-174

Fourty-four isotopic ages have been determined by K-Ar and U-Th-Pb methods for Late Palaeozoic granitic rocks in the Nanling Region, South China. All dating values vary within the range of 231–348 m.y. From the obtained dates, further evidence has been found that there do exist Late Palaeozoic granitic rocks, which can be subdivided into Late Devonian and Permian granitic rocks. Within a Late Devonian terrain, there is a granitic pluton, namely granodiorite with a zircon U-Th-Pb age of 348 m.y., while ten granitic plutons have been recognized within a Permian terrain where granites are predominant, yielding biotite K-Ar ages of 236–289 m.y. (λ _β =4.72×10^?10yr.^?1,λ _K=5.57×10^?11yr.^?1) and zircon U-Th-Pb ages ranging from 231 to 280 m.y., respectively. It is obvious from the dates that intrusive activity of granitic magma extensively took place in the Nanling Region during Late Palaeozoic, although no records of orogenie movements have been found, indicating that the faults are the main factor controlling the activity of granitic magma, whereas the orogenic movements are not the only prerequisite for the formation of granitic magma and the intrusive activity.  相似文献   

河南不同成因类型铝土矿的矿石特征   总被引：4，自引：0，他引：4  

陈廷臻  张天乐 《矿物学报》1989,9(1):89-94

本文在对铝土矿石物质组成研究的基础上,运用电子显微镜(EM)对河南两类不同类型铝土矿床的矿石结构进行了观察研究。根据EM观察到的铝土矿石显微结构的不同形貌特征,划分出三种矿石结构类型:致密-隐晶结构、粒状镶嵌结构和粒屑结构。由此归结为两个成因类型:古风化壳异地堆积亚型和古风化壳原地堆积亚型的铝土矿床。  相似文献   

虹螺山一带花岗岩类含钼性的矿物学标志     

刘成龙 《矿物学报》1986,(2)

通过对虹螺山一带酸性花岗岩类副矿物的研究,获得了一些岩体含钼性的矿物学标志。 区内含钼岩体最典型的副矿物组合是黄铜矿-锆石-金红石(白钛石)-辉钼矿型或硫化矿物-辉钼矿-锆石-磷灰石型。这种组合类型以含磁铁矿极微,且赤铁矿量大于磁铁矿,钛矿物中出现大凰白钛石或金红石,辉钼矿、黄铜矿等硫化矿物增多为其特征。含矿岩体副矿物明显具有多期性和多世代性。在形态上普遍成破碎颗粒状,特别是当锆石出现扁板晶、歪晶等形态时,对区内寻找钼矿具有标志意义。副矿物中钼浓度显著增高是岩体含钼性的微量元素标志,早期晶出的锆石等副矿物食钼较高,标示岩体有钼成矿的可能性,而辉钼矿的大量出现或其他金属硫化物含钼较高则可视为钼成矿的直接标志。含矿岩体和非含矿岩体中磁铁矿、磷灰石晶胞参数有规律性地变化,也是岩体含钼性的一种矿物学标志。  相似文献   

平泉萤石晶体的包裹体研究     

陈银汉  燕永恒 《矿物学报》1986,(2)

研究表明,平泉萤石中包裹体有五个生长带,其形成温度范围从100—132℃,压力16—24bar,流体的盐度为10.4—6.14％(wt),密度为1.040—0.995cm~3/g,Eh=-0.26—0.27V,成矿介质为弱酸性。研究中发现一种由凝胶(外壳)和胶体(内核)组成的胶体包裹体。  相似文献