角闪石族和辉石族矿物的系统矿物学分类命名   总被引：1，自引：0，他引：1  

刘显凡  汪灵  李慧  刘菁  赵甫峰  卢秋霞  胡琳 《矿物学报》2015,35(1):19-28

角闪石族和辉石族矿物是链状硅酸盐矿物的重要组成部分,它们中的许多矿物种属于造岩矿物和/或工业矿物,具有重要的成因矿物研究意义和工业应用开发价值。国内学者对它们的分类命名和基本系统认识主要源自于王璞等(1984)编著的《系统矿物学》。随着科学技术发展和矿物学研究的不断深入,原有的矿物基础资料和分类命名都在不断更新与完善,迄今已有专业学术机构和学者在不同年代陆续发表了不同版本对该两类矿物的修订或修改意见,但一直没有统一整合,导致在涉及该两类矿物的应用研究中,在分类命名上与国际标准不统一。根据本课题组在国家公益性行业科研专项项目(新编《系统矿物学》)所承担的研究任务和当前国内外研究进展,本文系统归纳、梳理并综述了角闪石族和辉石族矿物的分类方案和命名原则,使分类命名统一标准、原则和认识并与国际接轨,这有利于该两类矿物的理论研究与开发应用,更好地支撑地质学及相关学科的研究与发展。  相似文献   

Revised activity–composition models for clinopyroxene and amphibole     

J. F. A. DIENER  R. POWELL 《Journal of Metamorphic Geology》2012,30(2):131-142

Recent activity–composition models for clinopyroxene and amphibole are revised to provide better consistency with observed phase relations in natural rocks. For clinopyroxene, the calibration in NCFMAS is retained, but the incorporation of acmite is revised to improve the partitioning of ferric iron between coexisting clinopyroxenes. For amphibole, the NCFMASH calibration is retained, but the addition of ferric iron is changed to provide consistency with the clinopyroxenes. The thermodynamics of orthoamphibole (gedrite) is also adjusted to resolve an unrelated inconsistency. The effects of these improvements are illustrated through comparison of calculated pseudosections produced with the existing and new models with natural data from lawsonite eclogites.  相似文献   

Fluorine and chlorine in apatites,micas, and amphiboles of layered trap intrusions of the Siberian Platform     

V.V. Ryabov  O.N. Simonov  S.G. Snisar 《Russian Geology and Geophysics》2018,59(4):363-373

Geochemistry of chlorine and fluorine in apatites, micas, and amphiboles in rocks from eight intrusive complexes of the Siberian Platform has been first studied on the basis of new factual and analytical data (more than 1000 analyses). The main attention is focused on minerals from layered intrusions. Most apatites show F > Cl; the maximum contents of halogens are specific to chlorapatite (6.97 wt.% Cl) and fluorapatite (6.04 wt.% F). The total f value (f = Fe/(Fe + Mg), at.%) of femic minerals varies from 2 to 98 at.% in micas and from 22 to 95 at.% in amphiboles. The Cl-f and F-f trends show an increase in the Cl content and a decrease in the F content in the minerals with increasing f. Chlorine clearly exhibits ferrophilic properties, and fluorine has magnesiophilic properties. The halogen-richest minerals are fluorophlogopite (F = 7.06 wt.%, f = 7 at.%), chlorannite (Cl = 6.30 wt.%, f = 89 at.%), and chloroferrihastingsite (Cl = 5.22 wt.%, f = 90 at.%). Coexisting micas and amphiboles in the rocks are close in f value, but the micas are richer in Cl than the amphiboles. We assume that the halogen-containing minerals crystallized at the high pressure of halogen-hydrocarbon fluids at the levels of the MW, IW, and QIF buffers. The reducing conditions of the magmatism process are also evidenced by the presence of graphite and native metals in the rocks. The similarity of the Cl-f and F-f trends of micas and amphiboles from different intrusive complexes indicates the same mechanisms of the melt differentiation and mineral crystallization.  相似文献   

估算钙碱性长英质侵入岩结晶压力的地质压力计评述     

徐鸿雪  汪洋 《地质论评》2023,69(4):2023040029-2023040029

本文对四种常见的矿物压力计（角闪石全铝压力计、黑云母压力计、榍石压力计和“石英”压力计）的适用性进行了经验性检验。基于国内外典型钙碱性长英质岩体的矿物化学和全岩化学成分数据,采用不同压力计估算岩体侵位压力,并与角闪石全铝压力计结果对比。结果表明：角闪石六次配位Al压力计与广泛使用的角闪石全铝压力计的估算值存在系统相关性;榍石压力计计算的压力与角闪石全铝压力计的估计结果相关性较为显著;基于Qtz—Ab—Or简并花岗岩体系的“石英”压力计可以用于估计准铝质—弱过铝质钙碱性（狭义）花岗岩的结晶压力。但是,经验性的黑云母压力计和基于实验数据的黑云母压力压计均不能很好地复现角闪石全铝压力计的结果。黑云母压力计不适用于估算钙碱性侵入岩的结晶压力。  相似文献   

河南桐柏歇马岭金矿床地质特征及找矿标志   总被引：1，自引：0，他引：1  

姜克全  柳玉虎 《矿产与地质》2012,26(3):194-197

通过对歇马岭金矿地质特征和矿化富集规律的初步分析,提出了找矿标志和找矿模型,对矿区及外围进一步找矿提供了思路.  相似文献   

黄河和长江沉积角闪石亲石元素地球化学特征对比与物源辨识     

金秉福  党丽丽  孔庆祥  王孟瑶  岳伟  樊水淼 《沉积学报》2022,40(1):149-165

为辨识黄河和长江入海沉积物中角闪石的物源差异,对采自黄河口段、长江口段以及废黄河口和苏北沿岸,共26个样点、38组粒度粗细不同的碎屑角闪石进行了矿物元素地球化学测试,获得了这些角闪石群体的50种常量和微量元素含量值.结果表明:不同粒级测量的同源角闪石元素含量除少数大离子活泼元素相对偏差较大之外,大部分元素含量差异性较小...  相似文献   

Crustal thickness and adakite occurrence in the Philippines: Is there a relationship?     

Carla B. Dimalanta  Graciano P. Yumul  Jr 《Island Arc》2008,17(4):421-431

Adakites are increasingly being recognized worldwide in a variety of tectonic settings. Models on the formation of this geochemically distinct class of volcanic rocks have evolved from partial melting of subducted young, hot oceanic slabs to magmatism resulting from oblique subduction, low‐angle or flat subduction, or even slab‐tearing. Some workers have also pointed to the partial melting of thickened crust to explain the generation of adakitic melts. Rare earth element ratios from adakites and adakitic rocks in the Philippines were used in this study to obtain approximations of the levels where they were generated. These were tied to available geophysical data that defines the crustal thickness of the areas where the samples were collected. High Sm/Yb and La/Yb ratios denote the involvement of amphiboles, and in some cases garnet, in the generation of adakites and adakitic magmas. The presence of amphibole and garnet as residual phases suggests high pressures corresponding to thicker crust (～30 to 45 km). Adakites and adakitic rocks formed through processes other than melting of subducted young oceanic crust would need ≥30 km to account for the heavy rare earth element signatures. If mantle fractionation is not the process involved, crustal thickness is critical to generate adakites and adakitic rocks.  相似文献   

Using amphibole phenocrysts to track vapor transfer during magma crystallization and transport: An example from Mount St. Helens,Washington     

M.C. Rowe  A.J.R. Kent  C.R. Thornber 《Journal of Volcanology and Geothermal Research》2008

In order to evaluate and further constrain models for volatile movement and vapor enrichment of magma stored at shallow levels, amphibole phenocrysts from 2004–2005 Mount St. Helens dacite were analyzed for major and selected trace elements (Li, Cu, Zn, Mn, and REE) and Li isotopes. Several recent studies have examined fluid-mobile trace element abundances in phencryst phases and melt inclusions as a means of tracking volatile movement within subvolcanic magmatic systems, and high Li contents in plagioclase phenocrysts from 1980 and 2004 Mount St. Helens dacites have been interpreted as evidence that shallow magma was fluxed by a Li-bearing vapor phase prior to eruption.  相似文献   

Eruption episodes and magma recharge events in andesitic systems: Mt Taranaki,New Zealand     

Michael B. Turner  Shane J. Cronin  Ian E. Smith  Robert B. Stewart  Vince E. Neall 《Journal of Volcanology and Geothermal Research》2008

Eruption episodes, where a series of eruption events are generically related, can include the eruption of a wide spectrum of volcanic activity over decadal periods. This paper concentrates on the opening phases of an eruption episode which occurred approximately 1800 yrs BP from Mt Taranaki, New Zealand. These events spanned the eruption of differing bulk compositions and styles from two distinct vent locations; an andesitic sub-plinian eruption from the summit vent and a scoria cone-building eruption of basaltic magma from a satellite vent. Compositional profiles and zoning textures of plagioclase, amphibole and clinopyroxene phenocrysts from the opening andesitic event show evidence of magma mixing and subsequent crystallisation just prior to the initiation of the eruption episode. Titanomagnetite grain morphology and Ti variation suggest that the magma mixing event occurred within a few days to weeks before the eruption acting as a trigger for it. We present a magmatic model which is constrained by the petrological observations and eruptions of the episode. In this model magma differentiation at depth causes its rise and recharging of a mid-crustal magma storage area at 5–7 km. Although the recharging magma differed slightly in oxygen fugacity and temperature, it was compositionally and physically similar enough to the residing andesitic magma to allow efficient mixing. The petrological characteristics described here can be readily observed and enable identification of mixing events in other recent eruption episodes.  相似文献   

南黄海北部B03孔沉积物的重矿物特征及物源指示意义     

赵利  赵广涛  何雨旸  徐翠玲  祁奇  龙晓军 《中国海洋大学学报(自然科学版)》2014,44(9):72-81

本文对取自南黄海北部的B03孔岩芯(330cm)沉积物进行了粒度和重矿物特征分析,并运用电子探针技术,分析了其典型层位角闪石的矿物化学特征。研究表明,B03孔柱状样为均一连续的粉砂质沉积,重矿物含量较低(平均仅0.65%),主要为云母类和闪石类矿物,岩芯以85cm处为界分为上、下2个沉积层,其重矿物组合分别为普通角闪石-云母类矿物-绿帘石和云母类矿物-普通角闪石-绿帘石。角闪石的EPMA分析显示其种属主要为镁角闪石,其次为镁钙闪石、铁镁钙闪石及阳起石,成因以中酸性侵入岩与中高级变质岩为主,上下沉积层角闪石特征元素Mg/Fe2+比值分别为2.03、1.90。综合分析认为,岩芯的主要物源为黄河源物质及山东半岛陆架基岩剥蚀产物的混源,上下沉积层的矿物特征差异暗示了沉积物源发生了变化,其分界线可能代表了黄河1855年改道事件在山东半岛东部陆架的区域响应。  相似文献