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1.
本文在结构测定的基础上。应用穆斯堡尔谱技术。确定了钛钡铬石和钛钾铬石中铁离子的价态及结晶学位置。测试结果表明钛钾铬石中Fe的相对含量Fe~(2+)>Fe~(3+),而钛钡铬石中Fe~(2+)相似文献
2.
本文通过结构的测定和修正。确定了各阳离子特别是Zr_+~4在钛钡铬石、钛钾铬石(蒙山矿)中的结晶学位置,证实了这两个矿物是锶铁钛矿族的分别以大阳离子Ba和K为主的两种新矿物。通过与锶铁钛矿族其他矿物的晶体结构和晶体化学特征进行对比,探讨了这两个矿物中M(4)-O M(5)O平均键长较同族其他矿物的偏大的原因,以及该族矿物晶胞的实际形态与理想形态(据最紧密堆积原理推测的)相比在堆积层内有些伸长而在堆积方向则有些收缩的原因。由于结构中较独立的M(0),M(1),M(2)配位位置的存在,故使具有共同结构特征的锶铁钛矿族矿物种类繁多,且化学成分复杂。 相似文献
3.
在鉴定云南某铂矿区重砂样品时,发现一种含钛较高的铬磁铁矿.据文献记载,铬尖品石类矿物中除Cr、Fe、Mg、Al主要元素外,还可含有微量的T i、V、Ni、M n和Ca等元素.它们多呈类质同象存在于铬尖晶石结晶格架中,而TiO_2则常形成钛铁矿,在铬尖晶石类矿物中呈固溶体.本文所研究的铁质铬磁铁矿,化学分析含T iO_23.95%,电子探针分析含TiO_24～5%,且Ti呈均匀状态分布.彭志忠教授认为,这是一种含钛较高的 相似文献
4.
蛇纹岩矿物组合简单,主要组成矿物蛇纹石的温压稳定范围很大,这导致确定蛇纹岩的变质温压条件存在困难。本文通过实验岩石学模拟的方法,确定了钛粒硅镁石是蛇纹岩经历超高压变质的特征变质矿物。根据实验观察,压力达到3.0~3.5 GPa条件下,600~700℃范围内均存在钛粒硅镁石的生成反应,说明钛粒硅镁石在压力大于3.0~3.5 GPa条件下才能稳定;温度高于750℃,钛粒硅镁石开始减少直至消失。至于钛粒硅镁石的压力上限,由于实验条件所限,本次实验并未得出。钛斜硅镁石先于钛粒硅镁石出现,晚于钛粒硅镁石消失,稳定的温压范围更大。对实验样品观察发现,普遍存在钛粒硅镁石、钛斜硅镁石和橄榄石互为核边、互相交生的现象,这些实验现象与自然界中观察到的现象一致。低温高压条件下,由于这3类矿物结构的相似性,钛斜硅镁石与橄榄石通常出现互为核边的现象;随着温度升高,钛斜硅镁石以斑块或者片晶出现在橄榄石中,直至最终分解消失。钛粒硅镁石的出现与否取决于温压条件：低温低压条件下,钛粒硅镁石不稳定,发生分解产生钛斜硅镁石,出现钛斜硅镁石包裹钛粒硅镁石的现象;低温高压条件下,钛粒硅镁石稳定生长,出现钛粒硅镁石发育于钛斜硅镁石边部的现象;高温条件下,钛粒硅镁石不稳定,以片晶形式存在于橄榄石或钛斜硅镁石中。研究表明,钛粒硅镁石稳定于低温高压条件,确定其为冷俯冲带蛇纹岩超高压变质的标志。同时详细的岩相学显示了钛硅镁石矿物在高压变质过程中的行为,从而为俯冲带超基性岩变质研究提供理论依据。 相似文献
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富钛尼日利亚石产于燕山早期花岗岩体与泥盆系上统灰岩外接触带的大理岩中,呈六方板状,浅黄到棕黄色,(0001)解理完全,D=4.1,Hv=1280kg/mm~2(荷重50g),弱多色性,低重折率,No>Ne>1.78,一轴(一)。晶体结构为六方晶系,晶胞参数:α=5.7004,c=13.8699,V=390.33~3。探针成分多点分析平均含量:TiO_26.205、SiO_20.191、MgO5.525、MnO1.134、SnO_217.585、Al_2O_358.491、FeO5.021、CaO0.161、ZnO5.619。Kα特征X射线图象表明,钛在矿物中呈均匀分布,与锡成类质同象存在。富钛尼日利亚石是尼日利亚石的新变种。是在富Ti、Sn、高Zn、Al的岩浆期后热液中形成。 相似文献
6.
镍钛改性膨润土对铬的吸附性能研究 总被引：4，自引：0，他引：4
以钠基膨润土为原料,制备镍钛交联改性膨润土、镍钛有机复合改性膨润土,并应用于含铬模拟废水的处理。探讨了改性膨润土的用量、pH值、吸附时间等最佳使用条件,比较了原土、交联改性土、有机复合改性土对铬的吸附效果。结果表明改性土的吸附效果明显优于原土,在最佳实验条件下,交联改性土、有机复合改性土对Cr(Ⅵ)的去除率分别达到了87%和96%。两种改性土对铬吸附行为均符合Langmuir吸附等温方程,饱和吸附量和Lang-muir常数分别为3.1827mg/g、8.5543mg/g和3.5007、1.2738。 相似文献
7.
白云鄂博原型钡铁钛石晶体化学研究的新进展 总被引：1，自引：1，他引：0
钡铁钛石是白云鄂博REE-Nb-Fe矿发现的首个新矿物。迄今,已逾半个世纪。但是,关于原型钡铁钛石的化学分子式却有不同的表述,有的甚至殊异。拙文对这些写法各异的分子式进行了梳理,结合我们和国内外对原型钡铁石及其类似矿物的晶体结构测定,运用其最初发表的化学成分,按3种方法,重新计算矿物单位分子式中的离子数并分别加以评估。在此基础上,对原型钡铁钛石的晶体化学式作了初步改进。再者,关于原型钡铁钛石的晶胞参数,国内外亦存在歧见。主要根据晶体结构初步精修,借鉴东海产钡铁钛石晶体结构精测的启示,对原型钡铁钛石的真晶胞参数作了持之有据的推论。看来,原型钡铁钛石仍有深入研究的必要。可以肯定,它的晶体化学式、晶胞参数和晶体结构需要厘正、辩正和修正。 相似文献
8.
峨眉山高钛玄武岩中主要的赋钛矿物——榍石的产状、特征及成因 总被引：2，自引：1，他引：1
峨眉山玄武岩中钛以什么矿物形式存在一直以来很少有学者提及。本文通过镜下观察、全岩化学分析、X-衍射、能谱、扫描电镜、电子探针、阴极发光对川西南部周公山-汉王场地区钻井岩心中峨眉山玄武岩进行了详细的分析,讨论了其主要赋钛矿物及成因。(1)SiO2含量46.4%~48.3%和TiO2>3%显示区内峨眉山玄武岩属于高钛峨眉山玄武岩系列。但多个层段榍石含量>5%,而极少见磁铁矿、钛铁矿;(2)榍石主要以隐晶质的云雾状、雪花状、芝麻点状、枝状等形态分布于微晶长石之间和溶孔、溶洞边缘及裂缝中,少量呈显晶质粒状分布于微晶长石、绿泥石之间。(3)电子探针分析显示:所有含钛矿物中,钛铁矿中TiO2含量最高,为39.069%,榍石中TiO2次之,TiO2含量为17.143%~38.648%,磁铁矿中TiO2含量最高为12.293%,平均在5%~10%左右,其他矿物基本上都少于1%。(4)扫描电镜及其能谱分析显示:榍石中的Ti含量(2.49%~24.97%)明显高于含钛磁铁矿(2.68%~9.21%)、含钛赤铁矿(3.64%)中Ti含量,与钛铁矿(19.51%)含量相当。分析结果认为:峨眉山玄武岩中大量出现的隐晶榍石可能是岩浆后期产物或期后蚀变的产物。在峨眉山玄武岩中首次鉴别出的大量隐晶质榍石是高钛峨眉山玄武岩中最主要的赋钛矿物。隐晶榍石在玄武岩中的含量是区分"高钛"和"低钛"玄武岩的主要标志之一。 相似文献
9.
根据矿物薄片颜色判估铬尖晶石类型的方法 总被引：1，自引：0，他引：1
尖晶石族矿物为AB2X4型氧化物,因其阳离子A和B元素的不同,分属Cr、Fe、Al、Zn、Mn、Ti、Ni等不同种属,并有不同的产状。其中铬尖晶石仅见于幔源超镁铁岩和镁铁岩中。对岩石中副矿物铬尖晶石的薄片颜色与其矿物化学类型对比发现,二者存在着明显的专属关系,薄片中铬尖晶石的不同颜色可做为寄生岩体可能产出铬矿床或镍矿床的判据。副矿物和造矿铬尖晶石的化学通式是相同的,其中二价阳离子为Mg和Fe,三价阳离为Cr、Al和Fe。铬尖晶石以其三价阳离子含量百分比的不同分为不同的种属。岩石薄片下,铬尖晶石类矿物除含钛磁铁矿、铬磁铁矿和高铁… 相似文献
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11.
Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
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The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
13.
K.Naganjaneyulu 《地学前缘(英文版)》2014,5(1):1-2
正The Precambrian shields and associated suture zones of the globe preserve important records of continental growth and destruction,the formation and closure of ocean basins,and the early evolution of the Earth in terms of tectonics,resources,and environment.They also offer critical clues on the nature and style 相似文献
14.
Daniel Harlov 《地学前缘(英文版)》2014,5(5):621-625
正1.Introduction This special issue of Geoscience Frontiers is a tribute volume honoring the life and career of Jacques Touret.A set of research papers has been assembled,which broadly reflect his research interests over his 50 plus year career.These papers focus on the role that fluids play during the formation and evolution of the Earth's crust.Below I provide a brief summary of the life of Jacques Touret,along with a select bibliography of his more important papers.This is then followed by a brief introduction to the papers assembled for this special issue. 相似文献
15.
《地学前缘(英文版)》2014,(1):139-141
正1 AIM AND SCOPE GEOSCIENCE FRONTIERS(GSF)is a bi-monthly international journal that publishes in English high quality original research articles and timely reviews in interdisciplinary fields of Earth and Planetary Sciences.GSF aims to bridge innovative,provocative and challenging concepts and models related to various fields of research including petrology and geochemistry in understanding lithospheric architecture and mantle dynamics,global tectonics,economic geology and fuel exploration,geophysics,stratigraphy and paleontology with new 相似文献
16.
正The world petroleum exploration suggests that,about70%of the world’s potash resources were discovered during oil and gas exploration(Zheng et al.,2007).The Kuqa depression in the Tarim basin is abundant with petroleum exploration data,and 相似文献
17.
正Qarhan Salt Lake is located in the eastern part of the Qaidam Basin,which is first discovered the large potash deposit in the late 1950s.The Bieletan section is located in the west of Qarhan Salt Lake,where saline sediment 相似文献
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正With the approach of the 45th World Earth Day,China’s Ministry of Land and Resources issued the status of the Chinese geological survey and environments on 22nd April 2013.Regional geological survey in 2013 achieved new results—(why was oceanic in twice?)polar and oceanic expedition were fully completed,a national census of geography was begun,and 相似文献
19.
正1 Introduction The Lop Nor playa,located in the eastern end of the Tarim Basin,capped with a thick salt crust covering an area of approximately 5,500 km2(Ma 2007)that closely resembles a"Great Ear"in satellite images.Understanding the formation of the salt crust can provide important 相似文献
20.
In Liaoning, Hunan, Guangxi, Guizhou, Gansu, Sichuan, Anhui, Jilin and other provinces in China, there is a wide occurrence of metal quantity over 1000 tons of refractory gold ores, principally because of low gold recoveries and become ＂stay mine＂. Features of refi＇actory gold ores are： gold in micro-particles or a microscopic state that is wrapped in pyrite, presence of arsenopyrite and other sulfide minerals or disseminated in the crystal lattice of sulfide minerals; harmful impurity elements such as arsenic, carbon, mercury, antimony, copper with high content are closely related with the gold, and these elements affect the contact reaction between the gold and solvent extraction, making the recovery of the gold extraction process low. In the past 20 years, overseas countries have developed the application of the roasting oxidation method, hot acid （alkali） oxidation, bacterial oxidation and flash chlorination oxidation technology to solve this problem.Among these, biological oxidation has developed rapidly in the domestic market and gold enterprises abroad because of its low investment in infrastructure, low production costs, less environmental pollution, simple process and easy control, etc. 相似文献