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本文使用穆斯堡尔效应研究了在高温高压下合成的铁橄榄石和铁尖晶橄榄石。298K温度下铁橄榄石的穆斯堡尔谱由一组双峰组成,它被指派给Fe^2+(M1,M2)离子。298K温度下铁尖晶橄榄石的穆斯堡尔谱由三组双峰组成,其中两组双峰指派给八面体位置B上的Fe^2+,另一组双峰归为四面体位置A上的Fe^3+,两组Fe^2+双峰的同质异能迁移近似相等而四极分裂不同,Si原子在八面体位置上的占有率为6%~10% 相似文献
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山东金伯利岩中橄榄石的研究 总被引:1,自引:0,他引:1
本文首次研究了山东金伯利岩中橄榄石的产状、含量、大小、世代、形态、颜色、
环带、矿物包体、折光率、2V、化学成分、端员组分特征及红外光谱和穆斯堡尔谱特征,并分
析研究了橄榄石的成因。指出了无色一浅绿色的、含MgO、Cr2O3. Ni0高的橄榄石是找金刚石
矿的指示性矿物。 相似文献
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通过高温高压实验研究了铁橄榄石集合体的流变性.首先,利用高精度的Paterson气体介质变形装置对铁橄榄石集合体Fe2SiO4进行了高温三轴压缩蠕变试验.变形试验条件为:温度1273~1423K,围压300MPa,差应力10~250MPa,应变率10-7~10-4s-1,试件的最大变形量不超过20%.利用三维非线性拟合方法对蠕变试验数据进行分析,得到铁橄榄石集合体的微观变形机制为扩散域和位错域,扩散域的应力指数为1左右.位错蠕变域中,干燥铁橄榄石集合体的应力指数为5.4.活化能为781kJ/mol;含水铁橄榄石集合体的应力指数为3.4,活化能为516kJ/mol.实验结果表明,含水时铁橄榄石的流变强度比干燥时小一个数量级.将实验结果与铁橄榄石单晶的强度进行对比,发现铁橄榄石集合体的流变强度比铁橄榄石单晶的强度高.从而得到了铁橄榄石集合体高温高压流变性(强度)的初步试验结果. 相似文献
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翠榴石(Demantoid)是一种稀少的贵重宝石矿物。本文的新疆含铬翠榴石在我国属首次发现。通过化学成分、X射线粉晶衍射、穆斯堡尔谱、红外及可见吸收光谱等测定确认,新疆翠榴石所含钙铁榴石端员分子均在90%以上,接近于纯端员组成,Fe~(2+)含量低于穆斯堡尔谱最低检出界限。在这里,绿色与占据八面体位置的Fe~(3+)直接相关,而微量Cr~(3+)的存在则使其翠绿色色调大大加强。结合翠榴石产出地质条件及矿物共生组合分析可以认为,在超镁铁质岩体中残存的挥发分作用下出现了橄榄石、辉石被蛇纹石交代的现象,形成贫铝富铁的结晶环境。后期侵入的岩浆热液沿蛇纹岩裂隙交代促使石棉脉中翠榴石的结晶沉淀,而局部范围内的挤压错动则造成了由蛇纹石石棉“胶结”的翠榴石“团块”,翠榴石中含的微量铬来源于超镁铁质岩中的铬铁矿和铬尖晶石。 相似文献
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氟铁云母是三八面体云母类矿物新种,属铁云母的富氟类似物.利用电子探针、湿法和原子吸收分析等手段并结合穆斯堡尔谱分析的结果,按O+OH+F+Cl=12及四面体阳离子数之和为4计算的氟铁云母经验化学式为:(K0.92Na0.03Rb0.02Ba0.01)0.98(Fe1.822++Fe0.493++Al0.19Mg0.18Li0.18Ti0.08Mn0.05Zn0.02)2.99(Al1.17Si2.83)4.00O10(F1.03OH0.50O0.47)2.00.其理想化学式为:KFe32+AlSi3O10F2.使用粉晶XRD衍射仪,采用毛细管装样和超能探测器相结合收集衍射数据/图谱的微区衍射新方法收集氟铁云母的粉末衍射数据,通过构建晶体结构模型和Rietveld法晶体结构精修并收敛到Rp=2.51%,Rwp=3.19%,Rexp=2.85,X2=1.253完成晶体结构解析.矿物属于单斜晶系1M型,空间群C2/m;晶胞参数:a=0.537 05(4)nm,b=0.929 95(6)nm,c=1.017 35(6)nm;β=100.465(5)°,V=0.499 64(5)nm3;Z=2. 相似文献
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单斜星叶石矿物的穆斯堡尔光谱学研究 总被引:1,自引:0,他引:1
本文对产于俄罗斯希宾地区的单斜星叶石进行了不同的温度条件下的穆斯堡尔光谱效应研究,通过在温度分别在298 K,180 K和80 K条件下的分析,发现单斜星叶石由2个Fe~(2 )和1个Fe~(3 )四极双峰组成,并进行了单斜星叶石中的畸变参数包括八面体键角(σ~2)和键长变量(Δ)的计算。但是,在两个畸变参数之间存在着明显的差异,将无法对它们的穆斯堡尔参数和四极双峰进行指派。本文对温度在同质异能位移和四极分裂中的作用进行了探讨,根据通过穆斯堡尔效应和f(Fe~(3 )(O))/f(Fe~(2 )(O))的平均值获得的三价铁对全铁的比值,改写了单斜星叶石的化学式。 相似文献
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本文百次研究了山东金伯利岩中橄榄石的产状、含量、大小、世代、形态、颜色、环带、矿物包体、折光率、2V、化学成分、端员组分特征及红外光谱和穆斯堡尔谱特征,并分析研究了橄榄石的成因。指出了无色—浅绿色的、含MgO、Cr2O3、NiO高的橄榄石是找金刚石矿的指示性矿物。 相似文献
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S. A. Novikova 《Geology of Ore Deposits》2009,51(8):800-811
Fayalite is a common mineral of Fe-rich paralavas related to spontaneous combustion of coal seams. Fayalite has also been
found in parabasalts from burned coal waste piles of the Chelyabinsk coal basin. Among paralavas from different combustion
metamorphic (CM) complexes of the world, fayalite is the most widespread in the fused rocks of the Kuznetsk coal basin (Kuzbass)
and the Ravat area in Tajikistan. The optimal conditions for fayalite formation as products of coal fires in the Kuzbass and
Ravat resulted from a favorable combination of the composition of fused protolith (parental rocks) composed of pelitic and
Fe-rich sediments and the redox conditions of the deep subsurface ($
f_{O_2 }
$
f_{O_2 }
is lower than the QFM buffer). In the Kuzbass, fayalite is commonly hosted in high-silica aluminous Fe-rich paralavas composed
of Fe-cordierite (sekaninaite), tridymite, hercynite-magnetite, cristobalite, aluminous clinoferrosilite, and Al-K silicic
glass. The composition of all Kuzbass fayalites is close to the Fe2SiO4 end member. Kuzbass fayalites are characterized by a negligibly low CaO content and higher MnO and P2O5 contents like fayalites from burned rocks of other CM complexes. In Kuzbass paralavas, Fe-olivine is the late phase that
crystallized after sekaninaite and tridymite, immediately before melt quenching. 相似文献
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Ivan V. BRAGIN Georgy A. CHELNOKOV Oleg V. CHUDAEV Natalia A. KHARITONOVA Sergey V. VYSOTSKIY 《《地质学报》英文版》2016,90(1):276-284
Studied waters belong to warm(T=30-50℃),alkaline(pH=8.9-9.3),low mineralized(TDS235 mg/1)Na-HCO_3 or Na-SO_4-HCO_3 thermal waters with high content of SiO_2(up to 81 mg/l)and F(up to 3.9 mg/1),occur on modern volcano-tectonic rejuvenated areas of Eastern Sikhote-Alin orogenic belt.Low~3He concentration as well as N_2/O_2 and N_2/Ar ratios exclude influence of deep mantle fluid.New rare earth element data constrain our understandmg of water-rock interaction occurring in the water source region.Meteoric origin of waters is proved by stable isotope values varying from-71‰to-136.1‰and from-10.8‰to-18.8‰forδ~2U andδ~(18)O respectively.REE patterns reflect high pH,resultfing from water-rock interaction and oxidative conditions.Calculations of deep aquifer temperature using Na-K and quartz geothermometers show 116.8-131.1°C and 82.2-125.8℃respectively.Presence of deep faults both with abnormal thermal gradient(~45-50 K/km)define unique geochemical shape of thermal waters of Sikhote-Alin,area,where no present volcanic activity is registered. 相似文献
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土压缩模量预测回归分析方法 总被引:1,自引:0,他引:1
在土压缩模量Es的分析计算中,常用的分析方法是根据土的e-p曲线试验资料建立公式求解,本文引入了数学上的回归分析方法来探讨Es与其它各项物理力学指标参数之间的相关关系,旨在找出对Es影响最显著的指标参数,并建立最优回归方程式,以此来预测Es。研究结果表明:该方法通用性强,应用范围广,亦可推广应用于其它相关领域。 相似文献
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Using the database of automatic hydrometeorological stations, installed in the Don RIver delta and Taganrog Bay seashore, the sources of the anomalois scale water negative surge and salinization of the Azov Sea under conditions of low river flow in 2015–2016 are studied. The new schemes of stratification and advection of salty sea waters in the Don River mouth under different weather conditions, water discharge and levels are given. 相似文献
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Doklady Earth Sciences - Multiannual observations (2009–2017) by means of autonomous seiche recorders have been conducted for marine seiches with one second discreteness in the boot basin for... 相似文献
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《International Geology Review》2012,54(10):1218-1225
Copper deposits of Cuba belong to the Jurassic lead-zinc-copper, Cretaceous copper and Paleogene copper complexes, which differ substantially in their formation conditions. The island is differentiated into a number of metallogenic zones formed at the initial and early stages of the Cuba folded province. Pinar del Rio, Pinos, Trinidad and Oriente zones, of an intrageanticlinal nature, are prospective with respect to copper vein deposits of the lead-Zinc-copper complex. The Sasa and Cauto zones - intrageosynclinal - are prospective with regard to copper-pyrite and copper vein deposits of the Cretaceous complex. A metallogenic study of the island is indicated in planning the exploration of its copper prospects. -- AGI Staff. 相似文献