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   

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   

郯庐断裂带(安徽段)内磁铁石榴角闪岩的形成条件、年代学及构造归属的探究   总被引：5，自引：5，他引：0  

聂峰  石永红  王娟  康涛  曹晟 《岩石学报》2014,30(6):1718-1730

通过对肥东群南缘特征性岩石——磁铁石榴角闪岩的构造地质学和岩相学研究表明,磁铁石榴角闪岩及其围岩以构造透镜体形式产出,该变质岩具有两个阶段变质矿物组合,热力学评价显示①阶段的温压范围为：T=616~700℃和P=0.66~0.85GPa,平均温压为T=653±35℃和P=0.75±0.09GPa。②阶段的温压范围为：T=597~643℃和P=0.51~0.94GPa,平均温压为T=620±15℃和P=0.73±0.15GPa,并表现出一个快速等压降温P-T演化特征。锆石U-Pb定年和拉曼光谱分析表明,该磁铁石榴角闪岩的变质年龄为2469±49Ma。结合地质背景和前人的研究,可以判定该类岩石可能源于华北板块。由于郯庐断裂的左旋走滑作用被构造并置与扬子板块中。从而进一步推测,郯庐断裂（安徽段）横向宽度可达到10~15km。  相似文献   

Petrology and U-Pb Zircon Geochronology of Amphibole-rich Cumulates with Sanukitic Affinity from Husky Ridge (Northern Victoria Land, Antarctica): Insights into the Role of Amphibole in the Petrogenesis of Subduction-related Magmas     

Tiepolo  Massimo; Tribuzio  Riccardo 《Journal of Petrology》2008,49(5):937-970

A microanalytical trace element and geochronological study wascarried out on mafic amphibole-rich cumulates (quartz diorites)cropping out in northern Victoria Land (Antarctica). Associatedtonalites and basement rocks were also investigated. Rock texturesand major and trace element mineral compositions reveal thepresence in quartz diorites of two mineral assemblages: (1)clinopyroxene-I + brown amphibole ± dark mica; (2) clinopyroxene-II+ green amphibole + plagioclase + quartz. Both mineral assemblagescontain mafic phases with elevated Mg-number, but their traceelement signatures differ significantly. In situ U–Pbzircon geochronology was carried out to support petrogeneticand geological interpretations. Quartz diorites were emplacedin the mid-crust probably at 516 ± 3 Ma. Parental meltsof quartz diorites were computed by applying solid/liquid partitioncoefficients. The melt in equilibrium with the first mineralassemblage (melt-I) is extremely depleted in heavy rare earthelements (HREE), Y, Ti, Zr and Hf (at about 0·2 timesnormal mid-ocean ridge basalt) and enriched in B, Th, U, thelarge ion lithophile elements and light REE (LREE). It sharesmany similarities with sanukitic melts (e.g. Setouchi andesites),which originated by equilibration of subduction-derived sedimentmelts with a refractory mantle. The melt in equilibrium withthe second mineral assemblage (melt-II) is characterized bya steep LREE enrichment (La_N/Yb_N up to 39), a U-shaped HREEpattern and low Ti, which is depleted relative to HREE. Thetrace element signature of melt-II can be acquired through amphibolecrystallization starting from a sanukitic melt similar to melt-I,probably in a deeper magma chamber. Our results allow us toconstrain that melts from the subducted slab were produced ona regional scale, in accordance with literature data, belowa large sector of the east Gondwana margin during the mid-Cambrian.Implications for the role of amphibole in petrogenesis of subduction-relatedmagmas are also discussed. KEY WORDS: amphibole; sanukite; high-Mg andesites; Ross Orogeny; Antarctica  相似文献   

西藏冈底斯尼木后碰撞花岗岩的岩浆混合作用:显微结构证据   总被引：4，自引：3，他引：1  

陆天宇  贺振宇  张泽明  水新芳  颜丽丽 《岩石学报》2016,32(12):3613-3623

岩浆混合过程中不同熔体之间的相互作用会影响晶体的成核与生长,形成矿物内部复杂的成分变化,以及矿物之间的不平衡结构。尼木二长花岗岩位于冈底斯岩浆岩带中部,是代表性的形成于后碰撞构造演化时期的花岗岩体。本文对其中的斜长石与角闪石颗粒进行了详细的结构和成分分析,揭示了斜长石中的港湾状、浑圆状、筛孔状熔蚀结构以及斜长石成分的突然变化和角闪石包裹黑云母的不平衡结构,并探讨了它们的成因以及相关的岩浆混合作用。分析结果显示,斜长石中突变环带的An含量为37.6~40.6,熔蚀环带的An含量为48.2~59.5,均高于两侧斜长石的An含量(18.4~26.4),表明在形成这些结构时有外来基性岩浆的混合使得岩浆成分发生了突变。样品中的部分黑云母被自形的角闪石包裹,黑云母呈浑圆状并且具有港湾状的熔蚀边,这可能是基性岩浆的混合作用使得岩浆的温度升高导致黑云母发生部分熔融,混合后的岩浆在黑云母周围继续结晶形成角闪石。这些显微结构为揭示冈底斯岩浆岩带的岩浆混合作用提供了新证据。  相似文献