含钒石煤的穆斯堡尔谱研究   总被引：2，自引：0，他引：2  

江嘉济  许国镇 《现代地质》1991,5(2):192-200

本文收集了我国湘鄂淅地区含钒石煤样品,使用化学分析和穆斯堡尔谱方法,测定和研究了石煤中钒铁的赋存方式和价态,以及不同焙烧温度下钒铁价态变化等。初步研究表明,石煤中钒铁价态及价态变化的测定,对含钒石煤中钒铁矿物和成因研究,钒的提取和石煤的综合利用有重要意义。  相似文献   

民乐盆地的新构造与地震     

王多杰  徐小卫 《甘肃地质》1991,(1):24-35

民乐盆地位于甘肃河西走廓的中部,是北祁连地槽褶皱系山前的一个断陷盆地。该盆地西以榆木山为界,南靠北祁连山,北连龙首山,东部则以山丹以西沿大马营河至西大河水库西侧一线为界。盆地基底主要由两个构造层组成,下古生代加里东构造层,由奥陶、志留变质岩系构成了盆地的广泛基底;上古生代海西构造层,由石炭、二叠系及中生代的三叠系组成,分布在盆地的隆起带和单斜带。中生代以来,伴随区域性北西向断裂活动,持续接受沉  相似文献   

萨拉乌苏河地区地层中的碎屑矿物及其所反映的中更新世末期以来之气候环境变化   总被引：2，自引：0，他引：2       下载免费PDF全文

李保生  董光荣  高尚玉  丁同虎  申建友  邵亚军 《岩石矿物学杂志》1991,10(1):84-90

文章根据对萨拉乌苏河地区第四纪地层中的碎屑矿物分析结果,将重矿物按其抗化学风化的能力不同分为不稳定、较稳定、稳定和极稳定四种类型,不同层位的重矿物类型的百分含量不同,从而可求出重矿物的风化系数HW。不同时期地层的HW不同,而HW的大小变化与化学风化的程度有很大关系,一般来说,化学风化作用强,HW相应变小。而化学风化作用的强弱又主要受气候的影响,从而可推测该时期气候环境的变化。  相似文献   

Applications of Error Propagation Analyses to Geochemical Calculation     

徐伟彪  饶纪龙 《中国地球化学学报》1991,10(2):166-173

Two examples are given for comparing applications and limitations of four methods which can be used to deal with error propagation in geochemical calculations.The examples indicate that the Monte Carlo method can also be employed to evaluate the effect of covariance.A special function of the method for covariance matrix shown here can reveal the correlations of middle variables relative to the independent primary variables.  相似文献   

Petrochemistry,Age and Petrogenesis of the Shexian Pluton in Southern Anhui     

Xing Fengming  Xu Xiang  Ren Siming  Li Yingyun 《中国地球化学学报》1991,10(3):244-256

The Shexian gneissic granodiorite in southern Anhui trends NE 55° from Shexian in the west to Guitoujian in the east with a length of 22 km and an outcrop area of 32 km. It was considered formerly to be Caledonian on the basis of a biotite K-Ar age of 474 Ma (1982). However, new evidence indicates that it may be Early Jinning in age as shown by: (1) it is found intruding into the Mid-Proterozoic Shangxi Group and is unconformably overlain by the Sinian Xiuning Formation, and (2) a zircon U-Th-Pb age of 928 Ma is obtained for the pluton. The pluton is composed of plagioclase (An=27.37%), K-feldspar(14%), biotite(16%) and quartz(32%). Accessory minerals are ilmenite (150g/T), xenotime (15g/T). garnet(25g/T), monazite(10g/T), zircon (20g/T) and apatite (104g/T). Petrochemical characteristics of the intrusion are:(l) Al-enrichment (A/NKC=1.30); (2) H₂O enrichment (H₂O= 1.74%); and (3) low oxidation index (f ’=0.10). It belongs to the continental crust transformation type as evidenced by: (1) MF and Mg/Y values of biotite are 0.41 and 0.31 respectively; (2) (⁸⁷Sr/⁸⁶Sr)=0.71119; (3) δ Eu=0.52; and (4) A/NKC=130. The Shexian pluton is therefore considered as a product of melting of phyllite at depth in the light of similarities in trace element and REE contents with the phyllite of the Banxi Group. Calculations of REE batch partial melting indicate that it may have resulted from 75% melting of the Banxi phyllite.  相似文献   

A New Variety of Mineral—Argentian Mercurian Gold     

杨时惠  张汉卿等 《中国地球化学学报》1991,10(4):379-382

Argentian mercurian gold,golden-yellow in colour,is a variety of native gold containing Ag and Hg,coccurring as hexagonal and tetragonal crystals in hairy,milk-droplet or irregular forms.Its microhardness Hv=91kg/mm^2,equivalent to 3.04on Mons‘scale,and the reflectance is 70.35%(589nm).Chemical analysis gave:Au 56.05-67.33,Ag18.29-31.06 and Hg 10-14.82%,as well as minor Cu.In a few samples Bi or Fe was also detected.The simplified formula is (Au0.52Ag0.36Hg0.09Cu0.02)0.99.X-ray analysis suggests the mineral is of isometric system,with space group=Oh^5-Fm3m,a0=0.40803nm,V=0.06739nm^3,and Z=4.Argentian mercurian gold occurs in a Ag-multimetal deposit at Xiacun,Baiyu County,Sichuan Province,As observed in the mining district,the mineral is distributed along the fissures of the main metallic minerals pyrite,tetrahedrite,chalcopyrite,arsenopyrite,galena,sphalerite,etc.,or in the sulfide veinlets developed in the.fissures of these minerals.Also found in the mineral deposit are native gold,argentite,sulvanite,bournonite,boulangrite,etc.  相似文献   

Biotite percussion figures in naturally deformed mylonites     

Xu Shutong  Ji Shouyuan 《Tectonophysics》1991,190(2-4):373-380

  相似文献   

虎皮鹦鹉夜叫声量异常与地震关系的分析     

徐宝山 《地震研究》1994,17(4):389-395

本文根据江苏省东台市Ｊｉａｎｇ港农场综合地震测报点微观观测虎皮鹦鹉的实验资料，详细介绍了１９８５年以来记录到的两次地震前鹦鹉异常反应。并对观测条件和方法、资料的可靠性、异常指标的确定，地震前兆异常与非震异常特征及其鉴别方法等分别作了介绍和讨论，还对动物的微观观测可能成为监视地震的一种有希望的短临前兆手段，进行了估评。  相似文献   

大同铁路分局地裂缝带的三维构造特征及其成因分析   总被引：5，自引：0，他引：5       下载免费PDF全文

徐锡伟  钱瑞华 《地震地质》1994,16(4):355-364

通过实地考察、槽探和浅层地震探测等手段以及对地质构造和地下水超采环境的分析，详细地研究了大同铁路分局地裂缝带的三维构造特征，指出现今处于发展中的地裂缝带是由东向西扩展的，扩展速率为２６０～５２０ｍ／ａ，地裂缝带两侧的差异升降运动速率达２２．１～２４．４ｍｍ／ａ，主地裂缝带的水平拉张速率约１．１１～１１．６ｍｍ／ａ，垂直错动速率０．２～８．５７ｍｍ／ａ，左旋错动速率１．８７～３．５７ｍｍ／ａ。地裂缝带的活动方式为无震蠕滑型，扩展中的地裂缝是一种无震的地质灾害  相似文献   

苏北平原井下摆观测效果的讨论     

徐元耀 《地震地磁观测与研究》1994,15(6):31-35

文章以江苏省大丰台、盐城台、淮阴台、海安台，射阳台井下摆观测为例。比较它们的观测结果，分析认为井下摆的观测效果不仅与地面复盖层的厚度有关，而且与井下摆周围的环境干扰，观测用井的质量有关。为了提高井下摆观测效果，应尽量减少环境干扰，并注意井的垂直度和固井，文章还指出，沿海地区井下摆受海浪干扰相当显著的。  相似文献