衡山岩体西缘韧性剪切带磁性组构研究

本文对采自衡山花岗岩体西缘韧性剪切带的标本进行了岩石磁性组构研究,并将其与常规应变分析方法所得结果予以比较,表明了岩石磁化率各向异性椭球体与应变椭球体之间有一定的对应关系,岩石磁化率各向异性技术可望成为构造地质学的一种新手段。岩石磁性组构资料可应用于变形岩石的应变分析,特别是在没有宏观应变标志或者通常的岩石组构分析方法太费时间的情况下更显出其优越性。     

磁化率各向异性椭球三维图形显示的VB .net实现

磁组构在地球科学研究中具有广泛的应用.磁化率各向异性椭球形状可以反映丰富的地质信息.目前磁化率各向异性测量仪器所用软件不能以图形的方式直观地反映样品的磁化率椭球形状,其数据以二进制及文本方式存储,以纯文本方式显示,需借助其它数据处理与绘图程序来判别椭球形状.使用Visual Basic.net编程语言计算岩石样品的主磁化率及主方向,再调用Mathematica数学系统软件核心显示磁化率各向异性椭球的三维图形,调用Grapher绘图程序核心显示主方向,测量数据可直接存储到Excel文件中.首次实现了显示磁化率各向异性椭球的三维图形的功能,同时可以显示主方向的二维图形,可以进行从样品坐标系到地理坐标系的转换及手动输入15个方向磁化率数据进行主磁化率与主方向的计算.     

西昆仑山前晚新生代沉积岩磁组构及构造意义

西昆仑山前晚新生代沉积岩磁组构特征表明，沉积岩原生磁组构受后期构造活动改变。磁组构测试结果表明晚新生代沉积岩生较明显变形，岩石磁化率椭球体指示磁面理较发育，反映岩石受压扁型变形为主。磁化率椭球体最小轴方向为NW，指示该区最大主压应力为NW，与区域构造分析结果相一致。     

湖北青峰韧性剪切带构造岩的磁性组构研究

通过对青峰韧性剪切带中糜棱岩的磁性组构研究,同时与常规主应变分析方法所测结果比较,表明岩石磁化率各向异性椭球体与应变椭球体之间有一定的对应关系。磁性组构的特征为构造岩变形机制,以及断裂带的运动学、动力学等的研究提供了一种比较可靠、准确、方便的方法。     

对磁组构在岩石变形分析应用中若干问题的思考

在应用传统的磁组构方法进行岩石构造变形分析时,发现这些方法中有许多不完善之处,如变形岩石磁化率量值椭球和应变椭球是否可以对应及对应条件,初始磁组构是否会影响变形碉石磁化率量值椭球与应变椭球的对应关系,岩石脆性破裂前的塑性变形是否影响磁组构,韧性变形如何影响磁组构,能否用磁组构来推断主应力方向,Ｒａｔｏｒｅ（１９８０）最小磁化率指向对韧性剪切带运动方向和方式的分析在多期变形区是否适用等,并据此提出解     

用磁化率各向异性研究构造变形的几个问题

本文讨论了用磁化率各向异性研究构造变形时应注意的几个问题。介绍用磁化率各向异性研究岩石变形的限制条件,待解决的问题及应用前景。同时提出了地质历史时期岩石脆性破裂前的塑性变形可能会引起磁化率各向异性的变化及岩石中不同期,不同种类的磁性矿物的共存可能是影响磁化率椭球与应变椭球对应关系的是一个重要因素的观点。     

西藏南部聂拉木地区前寒武纪岩石磁组构及其构造意义

通过对西藏南部聂拉木地区前寒武纪岩石磁组构进行研究表明:该区岩石磁化率百分率的各向异性H值较高,均大于10%,这说明岩石曾经历了较强烈的韧性变形。根据岩石最小磁化率从主轴K3方向推断的岩石变形期,最大的主压应力方位主要有SN向、NE-SW向、NW-SE向。岩石磁组构费林(Flinn)图解表明,大部分岩石磁组构具有磁面理发育、磁线理不发育,岩石磁化率量值椭球体呈压扁状的特点。部分岩石磁组构还具有磁线理发育、磁面理不发育,岩石磁化率量值椭球体呈拉长形的特点。因此,该区域构造应变型式具有压缩应变和拉伸应变二种型式。岩石磁组构研究还表明,该区具有SN向挤压、NW-SE向挤压、NW-SE向伸展滑脱三期构造应力。这说明高喜马拉雅结晶基底岩石曾经历了SN向逆冲推覆构造作用,NW-SE向逆冲推覆构造作用和NW-SE向伸展滑脱构造作用过程。构造应力场的转变及其构造作用,为印度板块与欧亚板块之间,自白垩纪末~始新世晚期发生的弧~陆、陆~陆碰撞,和始新世晚期以来,强烈的陆内汇聚造山与青藏高原剧烈隆升,及区域伸展滑脱构造作用过程的响应。     

岩石磁组构在断裂变形性状与期次研究中的应用——以广西博白-合浦断裂为例

岩石磁化率椭球体的三个轴与应变椭球体的三个轴方向相平行,并具有一定的共构关系.变形岩石的磁组构参数P、T、F、L以及磁化率椭球体主张量方向等可以用来定量地表征岩石变形的性状及期次.本文通过实测和计算27个样品的磁组构参数,研究了博白-合浦断裂带的变形性状与期次,结果表明:博白-合浦断裂带大致经历了三期构造变形作用,不同时期具不同性质的构造变形.变形性状分别表现为韧性、韧-脆性及脆性变形,应变行为分别表现为平面、非平面和线性应变.     

藏东昌都地区侏罗纪岩石磁组构研究及其构造意义

本文对藏东昌都地区侏罗纪汪布组、东大桥组和小索卡组红层共71个采点开展了磁组构(AMS)研究。磁组构测试结果表明,早侏罗世汪布组岩石磁线理较磁面理发育,磁化率各向异性度较高,磁化率椭球最小轴K3散布于层面缩短方向,代表了与构造成因相关的磁组构;中侏罗世东大桥组和晚侏罗世小索卡组岩石则磁面理较磁线理发育,磁化率各向异性度较低,磁化率椭球最小轴K3与层面近垂直,指示了原生沉积磁组构。早侏罗世汪布组地层的磁组构揭示了其构造应力场方向为NE-SW向。中侏罗世东大桥组的磁组构指示了其沉积时的古水流方向为SE向(138.3°),而晚侏罗世小索卡组磁组构指示了其沉积时的古水流方向为NNW向(328.3°)。古水流方向的明显变化揭示了昌都地区从中侏罗世到晚侏罗世沉积物物源发生了相应的转变,表明昌都地区南早北晚的隆升过程。     

磁化率各向异性与剪切带

岩石组构记录了地壳形成与演化的关键信息,提取这些信息对分析和恢复地球动力学过程具有重要意义.磁化率各向异性(AMS)是一种重要的岩石组构方法,可以有效地揭示岩石的应变特征,分析其地球动力学过程,是研究构造变形性质以及应力作用方式的有效手段.本文在梳理AMS的研究历史、主要成果和最新进展的基础上,系统阐述了AMS的基本原...     

Magnetic fabric and modeled strain distribution in the head of a nested granite diapir,the Melechov pluton,Bohemian Massif

The Melechov pluton, Bohemian Massif, is interpreted as a mid-crustal nested granitic diapir with an apical part exposed at the present-day erosion level. The diapir head exhibits a concentric structure defined by lithologic zoning and by the anisotropy of magnetic susceptibility (AMS). In concert with theoretical models, outward-dipping margin-parallel magnetic foliations are associated with oblate shapes of the susceptibility ellipsoids and higher degree of anisotropy, passing inward into weaker triaxial to prolate fabric. By contrast, magnetic fabric in an inner granite unit is in places oriented at a high angle to internal contacts and is interpreted as recording an internal diapir circulation. We use inverse modeling to calculate strain variations across the diapir from the AMS data. The magnetic fabric parameters and calculated strains are in agreement with strain distribution in heads of model Newtonian diapirs traveling a distance of two body radii and suggest granitic magma ascent as a crystal-poor suspension followed by crystallization of fabric markers and their response to strain near the final emplacement level. The intrusive fabric thus formed late but, though generally weak, was still capable of recording incremental strain gradient in the granite diapir.     

福建中甲锡矿及其外围岩石磁组构特征

磁组构成分析是利用岩石磁化率各向异性研究构造变形特征及其应力作用方式和方向的方法,研究表明,中甲地区岩石各向异性度Ｐ值比较小,反映本区总体变形较弱,但变质石英砂岩相对变形较强。变质石英砂岩磁面理发育,磁线理较弱,显示压扁变形,变形主压应力方向是ＮＷ－ＳＥ向。火山（碎屑）岩具有明显的磁线理,反映流纹构造特征;最大磁化率轴方向屡示本区火山岩流体构造为ＮＷ－ＳＥ向。矿化蚀变岩和矿石的磁各向异性度Ｐ值明显     

Anisotropy of magnetic susceptibility as an indicator for palaeocurrent analysis in folded turbidites (Outer Western Carpathians,Poland)

The anisotropy of magnetic susceptibility is a well-known geological proxy in revealing the directional tectonic and sedimentological features of rocks, although it can be ambiguous in situations where these two factors co-occur. This paper demonstrates the usefulness of the anisotropy of magnetic susceptibility in determining palaeotransport directions in turbiditic rocks that underwent subsequent thrusting and folding. This study demonstrates that the magnetic lineation is largely unsuitable as a palaeocurrent direction proxy, and suggests that the imbrication of magnetic foliation is better in such cases. Moreover, the anisotropy of magnetic susceptibility results were analyzed in reference to a joint and fold study within the framework of the regional structural geology. Magnetic fabric investigations were conducted in the eastern part of the Outer Western Carpathians (south-east Poland). During the study, a total of 191 oriented palaeomagnetic samples were collected from three outcrops (Nasiczne, Dwernik and Hoczew) in the Krosno Beds, Silesian Unit. For the purpose of sedimentological analysis, 121 m of turbidite successions were documented and 126 directional sedimentary structures were measured. The magnetic anisotropy of sandstones revealed typical sedimentary fabrics, often overprinted by variably intense tectonic deformation. Oblate susceptibility ellipsoids from Nasiczne showed tilt coherent with the palaeoflow direction, whereas the rocks from Dwernik and Hoczew contained triaxial magnetic fabric developed during compressional palaeostress. This paper suggests that medium-grained and coarse-grained sandstones, preferably with high mica content, are the most suitable for palaeotransport reconstructions among the studied lithologies.     

白银厂矿区劈理成因的磁组构分析

将磁性组构方法用于甘肃白银厂矿区的构造分析.结果表明该区岩石的磁性组构与岩石组构具有同一分布规律.岩石的磁线理与岩石的拉长线理L~a近于一致,磁面理与第一期劈理S_1基本平行,并垂直于岩石的磁化率椭球的最小主轴,也垂直于应变椭球的最短主轴方位,故推断第一期劈理S_1的成因主要属压扁成因.同时受到后期的多次变形与褶皱迭加影响.S_1轴面的优选面状分布发生变位不大,表明该区多次构造变形主要来自早期的同一主应力场作用所致.矿区岩石的磁面理与应变椭球拉长轴面或第一期劈理面S_1存在某些的角度差,表明该区岩石的劈理面由于受后期多次构造变形影响,可能发生剪切运动或旋转机制.     

Anisotropy of magnetic susceptibility of heated rocks

Heating produces changes, which does not always correspond to simple enhancement of the magnetic fabric. Two methods are proposed to determine the anisotropy of magnetic susceptibility of the ferrimagnetic minerals formed or that have disappeared by chemical change during successive heating. The first diagonalizes the tensor from the difference between each tensor term before and after heating. The second employs linear regression for each tensor term made with the values obtained throughout a thermal treatment. When the same magnetic fabric is obtained from several thermal steps, it cannot be related to randomly oriented ferrimagnetic minerals. Instead, the newly formed fabric must be related to characteristics of the pre-existing rock. By comparing this ferrimagnetic minerals fabric with the initial whole rock fabric, we can distinguish cases where heating simply enhances pre-existing fabric from those where thermal treatment induces a different fabric. Relative to the pre-heating fabric, this different fabric may simply be an inverse fabric or one whose principal susceptibility axes are oriented in a different direction, related to petrostructural elements other than those defining the initial fabric.     

Magnetic susceptibility anisotropy as a strain indicator in the sudbury basin, Ontario

The magnetic susceptibility anisotropy of 181 samples from the Chelmsford Formation, the Onaping Formation and the norite of the Sudbury Basin has been measured. Magnetic foliation planes are almost exactly parallel to the planar structural elements (slaty cleavage and foliation) that are axial planar to the Basin. Magnetic lineations, where present, are parallel to linear structural elements (mineral elongation lineations). The shapes of the susceptibility ellipsoids of individual samples and the grouping of their principal axes are used to classify each site according to one of nine possible anisotropy types. In the Chelmsford Formation there is dominantly one anisotropy type, but several are present in the norite. At each site there is a variation in shape of the anisotropy ellipsoids, which can be interpreted using magnetic susceptibility axial ratio plots analogous to the deformation plots used by structural geologists. Using this technique the measured anisotropy patterns are interpreted in terms of progressive modification of original predeformation magnetic fabrics by various types of strain. In the norite the shape of the susceptibility ellipsoid and the anisotropy type vary systematically with distance from the Grenville Front.     

玲珑花岗岩体的变形磁组构特征及其与金矿的关系

本文利用磁组构的方法对玲珑花岗岩体的磁组构特征及其与金矿的关系进行研究.玲珑岩体的磁化率各向异性度P的平均值为1.2872,具有典型的构造变形成因特点;磁面理围绕其西北侧的北截花岗闪长岩展布,倾角平缓;磁线理呈SW向近水平展布.玲珑岩体的变形磁组构的特征表明玲珑岩体的变形磁组构是由于后期侵入的北截郭家岭花岗闪长岩体侵入造成的.研究还发现除了断裂的控矿作用以外,位于玲珑岩体内部和边缘的金矿和磁化率各向异性间存在密切的空间对应关系.金矿往往位于磁化率各向异性度P值高的区域,而磁化率各向异性度P值低的区域金矿很少.     

Magnetic fabric study of the SE Rhenohercynian Zone (Bohemian Massif): Implications for dynamics of the Paleozoic accretionary wedge

The progressive deformation recorded in the magnetic fabric of sedimentary rocks was studied in the SE Rhenohercynian Zone (RHZ), eastern margin of the Bohemian Massif, Czech Republic. Almost 800 oriented samples of the Lower Carboniferous mudstones and graywackes were collected from the SSE part of the Czech RHZ, so-called the Drahany Upland. The anisotropy of magnetic susceptibility (AMS) is predominantly controlled by the preferred orientation of paramagnetic phyllosilicates, mainly iron-bearing chlorites. A regional distribution of the magnetic fabric within the Drahany Upland revealed an increasing deformation from the SSE to the NNW. In the SE, the magnetic fabric is bedding-parallel with magnetic lineation scattered in the bedding plane or trending N–S to NNE–SSW. Further to the NW, the magnetic foliation rotates from the bedding-parallel orientation to the orientation parallel to the evolving cleavage. This rotation is accompanied by a decrease of the anisotropy degree and the prolate nature of the anisotropy ellipsoids. The magnetic lineation is parallel to the strike of the bedding, bedding/cleavage intersection, pencil structure or the fold axes on a regional scale. In the NW part of the Drahany Upland, the magnetic foliation becomes parallel to the cleavage accompanied by an increase of the anisotropy degree and the oblate nature of the anisotropy ellipsoids. The increasing trend of deformation corresponds to the SSE–NNW increase in the degree of anchimetamorphism; both trends being oblique to the main lithostratigraphic formations as typically observed in the sedimentary rocks of the accretionary wedges. The SSE–NNW increase in deformation and anchimetamorphism continues to the Nízký Jeseník Mts., representing the northern part of the same accretionary wedge. The kinematics of deformation could not be unambiguously assessed. The observed magnetic fabric may reflect either lateral shortening or horizontal simple shear or a combination of both mechanisms. Regarding the subduction process, it seems that the sedimentary sequences of the Drahany Upland were subducted, partly offscraped and accreted frontally or partly underplated as opposed to the Nízký Jeseník Mts. where some return flow must have occurred.