ICP—AES浓度比法在耐火材料分析中的应用   总被引：2，自引：0，他引：2  

阴怀亮  黄少平 《岩矿测试》1990,9(2):110-114

本文叙述了适用于耐火材料分析的ICP-AES浓度比法通用公式,并成功地用于锆质、硅质、镁质、镁铬质、高铝粘土质等耐火材料常规样品的分析,获得了较高的精密度。尤其对含量高于80％的元素,测定的精密度更好。  相似文献   

Petrological investigation of the Ganyu peridotite in the Sulu ultrahigh-pressure terrane, eastern China   总被引：1，自引：0，他引：1  

Shizhong Chen  Jingsui Yang 《Tectonophysics》2009,475(2):383-203

The ultramafic body sampled in the Chinese Continental Scientific Drilling (CCSD) Hole PP3 is located in the eastern part of the Dabie-Sulu UHP metamorphic belt near Donghai County. It is about 480 m thick, and consists chiefly of garnet peridotite, dunite and serpentinite. The principal minerals include olivine, chromium spinel, diopside, enstatite, garnet with minor secondary augite, phlogopite and amphibole. Both the olivine and orthopyroxene are highly magnesian, and the garnet is pyropic with 5.4-6.4% CaO and 0.3-3.3% Cr₂O₃. Two generations of clinopyroxene are present; an early diopside followed by augite. Chromium spinels are highly variable with Cr#s (100Cr / (Cr + Al)) between 51 and 89, and their compositions reflect different processes of formation, namely partial melting and eclogite, amphibole and greenschist facies metamorphism. The Mg#s (100 Mg / (Mg + Fe²⁺))of the spinels correlate positively with the Cr#s but negatively with oxygen fugacity. Based on the spinel compositions the ultramafic rocks originated in the shallow mantle, then subducted to depths of more than 100 km and finally exhumed to the surface. They underwent partial melting at shallow depths, mostly in the spinel facies, and were later transformed into garnet peridotites during deep subduction. All of the rocks were weakly metasomatized during exhumation and were subjected to retrograde metamorphism.  相似文献   

膜生物反应器处理难降解废水的特性研究   总被引：3，自引：3，他引：0  

张凤君  赵芝清  周秀清  苏克  周海林  于广菊 《吉林大学学报(地球科学版)》2005,35(6):786-789,795

膜生物反应器与生物接触氧化法处理难降解废水的对比研究表明,在相同的运行条件下,膜生物反应器比生物接触氧化法具有更稳定的出水水质,其平均出水COD_cr去除率达到88.41%,比接触氧化法提高了近30%;其平均色度去除率达到85.27%,相比接触氧化法,提高了近30%。通过出水分子量组成分析发现,膜出水以分子量介于3 000和10 000之间的物质为主,占总数的88.36%,接触氧化以分子量大于10 000的物质为主,占总物质的72.04%,介于3 000和10 000之间的仅占9.76%。  相似文献   

河北阳原新生代玄武岩中橄榄岩捕虏体矿物化学:华北岩石圈地幔演化   总被引：1，自引：0，他引：1  

陈曦  郑建平 《地球科学》2009,34(1):203-219

橄榄岩及其中矿物的组成, 特别是单斜辉石的微量元素, 可以很好的揭示岩石圈地幔性质.在对河北阳原新生代玄武岩中橄榄岩捕虏体详细岩相学和矿物化学研究基础上, 重点分析了单斜辉石的激光原位微量元素, 讨论了新生代华北内部山带岩石圈地幔特征及其演化机制.阳原地区陆下岩石圈, 除个别样品的部分熔融程度为15%~20%外, 多数样品<5%, 显示该区的地幔演化是不均一的, 并表现为饱满与难熔-过渡型地幔的交叉并存.这种共存现象可以用软流圈物质对古老地幔进行不均匀侵蚀、改造和置换作用来解释.   相似文献   

New constraints on the evolution of the Gibraltar Arc from palaeomagnetic data of the Ceuta and Beni Bousera peridotites (Rif,northern Africa)     

《Journal of Geodynamics》2015

The Betic Cordillera and the Moroccan Rif together form one of the smallest and tightest orogenic arcs on Earth and almost completely close the Mediterranean to the west. For the explanation of the geodynamic evolution of the mountain belt, palaeomagnetic data that generally found clockwise block rotations in the Iberian and anticlockwise rotations in the Moroccan part of the mountain belt, have played a key role in recent works. This palaeomagnetic study has found new constraints on the rotations and timing of the peridotitic bodies outcropping in the key position at the westernmost margin of the mountain belt, in Ceuta and Beni Bousera (Rif, northern Africa).Detailed thermal demagnetization of 115 individually oriented samples from 14 sites was combined with rock magnetic and scanning electron microscopic experiments to analyze the magnetic mineralogy responsible for the remanences and the mechanisms and relative times of their acquisition. In Ceuta, up to three magnetic components, and in Beni Bousera, up to two magnetic components have been found, that are all to be interpreted as chemical remanent magnetizations (CRM). The data suggests the following succession of geodynamic events affecting the peridotites until recent times: (1) after their exhumation and subsequent cooling about 20 Ma ago, they recorded a characteristic remanent magnetization of both normal and reversed polarities, carried by (pseudo-)single-domain magnetite grains; (2) after their dismembering, the Ceuta peridotites were tilted southward by 22–34° about a horizontal or tilted axis (up to plunge 50°) with an azimuth of 72–145° and the Beni Bousera peridotites were rotated anticlockwise by 72.3 ± 12.1° about a vertical axis and (3) both recorded another magnetic signal of normal polarity only, carried by multi-domain magnetite grains; and finally (4) the Ceuta peridotites rotated anticlockwise by 19.7 ± 5.9° about a vertical axis.This study provides the first palaeomagnetic data for the Ceuta peridotites that, with their tilt and recent small net rotation, had a distinct geodynamic evolution from the large net rotations about vertical axes in Beni Bousera and Ronda (Betic Cordillera). Moreover, earlier palaemagnetic data for Beni Bousera is improved, as mixed polarities have been found in the older of the remanences for the first time, and its interpretation as a CRM changes the rotation timing that was proposed previously. The sequence of events exposed in this work are important constraints that need to be incorporated in any geodynamic model of the evolution of the Betic–Rifean mountain belt.  相似文献   

Morphology and distribution of dolines on ultramafic rocks from airborne LiDAR data: the case of southern Grande Terre in New Caledonia (SW Pacific)   总被引：1，自引：0，他引：1       下载免费PDF全文

Julie Jeanpert  Pierre Genthon  Pierre Maurizot  Jean‐Luc Folio  Myriam Vendé‐Leclerc  Jeremy Sérino  Jean‐Lambert Join  Marion Iseppi 《地球表面变化过程与地形》2016,41(13):1854-1868

Dolines are closed geomorphological depressions which are surface manifestations of karstic systems. Usually developed on limestones, they also typify the morphology of the New Caledonian landscape, particularly on the southern massif of the main island (known as Massif du Sud). The specificity of dolines here lies in their development on ultramafic rocks. They are evidences of subsidence, suffosion and collapse phenomena resulting from dissolution weathering of peridotites. However, extensive underground drainage systems are still not yet recognized. Semi‐automatic mapping of dolines is carried out on a 148 km² area of the Massif du Sud from a high accuracy LiDAR digital elevation model. In this area 8601 dolines ranging from 1 m² to 2 km² are identified and morphologically characterized with precision. Most are small, shallow and round‐shaped, yet more complex shapes are locally observed. Size distribution analysis allows the setting of a threshold of 20 000 m² above which surface processes rather than chemical weathering control doline evolution. Doline density analysis reveals high concentrations on flat areas where ferricrete overlies the complete weathering profile, especially in the case of elevated rainy watersheds. Dolines are aligned and elongated along a north 135° ± 5° major fracture direction, which is inherited from the obduction of the Pacific Plate upper mantle in the Late Eocene. Finally, we propose a pioneering morphometric typology of dolines that provides important clues as to pseudokarstic activity. We define collapse, bowl‐shaped and flat bottom dolines. Collapse and bowl‐shaped dolines are assumed to denote active pseudokarst. They may widen and deepen, or eventually be filled by sediments. They are distinguished from flat bottom dolines that are partially to completely filled, which suggests that they are associated with paleo‐pseudokarsts. However the groundwater flow paths associated with the genesis and evolution of dolines must be clarified, thus collapse and bowl‐shaped dolines should be hydrologically monitored. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Allende陨石富深绿辉石—钙长石—尖晶石难熔包体的岩石学和矿物化学特征:熔融和蚀变证据     

于明生  林杨挺  田明君 《世界地质》2014,33(4):965-973

对Allende陨石中一块富深绿辉石--钙长石-尖晶石难熔包体进行了岩石学和矿物化学研究。包体近似球形(半径~3 mm),边部为钙长石和方钠石(Mg O=1.04%~2.69%;Fe O1.57%)组成的矿物圈层(厚度~200μm),内部主要矿物有深绿辉石(Al2O3=7.63%~16.08%;Ti O2=1.73%~4.48%)、钙长石(Mg O0.41%;Na2O0.14%)和尖晶石(Fe O1.70%)。包体中残留黄长石(k70~85,Na2O0.22%),颗粒较小(10μm),大部分都被蚀变成为钙铝榴石、钙镁橄榄石和氯硅铝钙石(Mg O=5.07%~8.04%;Fe O0.31%)。包体规则的外形不可能由气—固凝聚形成,而可能是由熔融重结晶形成。黄长石含量较少以及残余黄长石非常富镁说明包体可能经历过蚀变作用,且方钠石与氯硅铝钙石的产状和成分差异说明包体可能经历了两次不同的蚀变事件。  相似文献   

Method Development and Optimisation of Sodium Peroxide Sintering for Geological Samples          下载免费PDF全文

Syed Nadeem Hussain Bokhari  Thomas C. Meisel 《Geostandards and Geoanalytical Research》2017,41(2):181-195

This work provides a measurement procedure for the complete digestion of rock samples containing refractory minerals such as zircon and chromite. Their dissolution by wet acid digestion is often incomplete but, although providing complete digestions, alkali fusion techniques can result in solutions with a high blank and total dissolved solid content. It was established by the systematic study with reference material trachyandesite MTA‐1 that a 1:6 sample to sodium peroxide (Na₂O₂) ratio is conservative for the complete digestion and recovery of all the analytes especially those contained in zircon. The sample decomposition time was 120 min for the zircon‐bearing rhyolite reference material MRH‐1. Complete digestion of chromite was obtained in the harzburgite RM MUH‐1. The sample solutions were stable for at least 1 year. Accurate measurements of SiO₂, Al₂O₃, TiO₂, P₂O₅ and K₂O could be made with ICP‐MS by not discarding the supernatant of the sinter solution and by using geological reference materials for external calibration. HF digestions are slow, not universal, and may form new mineral/phases that are insoluble under high temperature conditions. The validated sample decomposition procedure combined with ICP‐MS presents an alternative to the use of HF in routine analysis of difficult to digest geological materials.  相似文献   

SHS耐火材料的应用现状及发展前景   总被引：1，自引：0，他引：1  

李建平  倪文  邱永侠  赵万智 《矿物岩石地球化学通报》1999,(4)

目前,冶金行业普遍存在工业窑炉用不定形耐火材料对局部损毁的修补,以及整体浇注料、捣打料的烧结程度低、强度低等问题。这些问题用传统方法均难以解决;自蔓延高温合成（ＳＨＳ）技术是有希望解决这些问题的一种有效的工艺方法。把ＳＨＳ方法应用于耐火材料的制造,特别是用于传统工艺难以解决的部位,因其制备工艺简单、烧结速度快且产品性能优良,而具有重要的现实意义和广阔的应用前景［１～７］。下面就ＳＨＳ耐火材料的特点、应用现状和发展前景及存在问题作一系统论述。１　ＳＨＳ耐火材料的应用现状　　在ＳＨＳ耐火材料研究和应…  相似文献   

西藏雅鲁藏布江缝合带普兰地幔橄榄岩铬尖晶石成因研究     

赵斌  龚小晗  黄启帅  史仁灯 《岩石学报》2020,36(2):455-468

普兰蛇绿岩位于雅鲁藏布江缝合带西段,其中地幔橄榄岩由方辉橄榄岩、含单斜辉石方辉橄榄岩以及少量二辉橄榄岩及纯橄岩组成。尖晶石是地幔橄榄岩中常见的副矿物,可以作为重要的岩石学成因指示剂。在野外地质调查基础上,通过岩相观察、电子探针、尖晶石成分面分析、电子背反射衍射分析,可将普兰地幔橄榄岩铬尖晶石分为三类:第一类铬尖晶石呈自形,粒径较小(<100μm),或包裹于斜方辉石中,或杂乱分布于橄榄石和辉石之间,具有高Cr^#(>0.6)、低Mg^#(0.43~0.57)的特征,为部分熔融+玻安质熔体交代成因;第二类铬尖晶石呈半自形-他形,粒径较大(>100μm),常含有橄榄石、辉石包裹体,具有中Cr^#(0.17~0.42)、高Mg^#(0.63~0.77)的特点,主要受部分熔融作用影响;第三类铬尖晶石呈他形蠕虫状与辉石交生在一起构成后成合晶结构,粒径变化较大,具有低Cr#(0.17~0.28)、高Mg^#(0.67~0.77)的特点。EBSD分析结果显示尖晶石、辉石的结晶学优选方位(CPO)较为相似,表明为同一矿物分解而来,单斜辉石与大陆岩石圈地幔捕掳体中石榴子石的稀土元素对比表明构成后成合晶结构的辉石和铬尖晶石为具有大陆岩石圈地幔属性的高压石榴子石退变分解而成。综合分析表明:普兰蛇绿岩的地幔橄榄岩体在从石榴子石相深度上升过程中发生了石榴子石退变、岩石部分熔融及熔体渗透作用,岩体经历了威尔逊旋回初期的大陆裂谷阶段,主体经历了中-低程度的部分熔融,类似大洋中脊环境,局部受到了富硅、富镁玻安质熔体的影响。  相似文献