花岗岩单元—超单元填图的理论基础划分标志与归并原则

本文综述了花岗岩单元－超单元填图的理论基础和分解岩体、划分侵入体的标志及单元、序列、超单元超单元组合的归并原则，对花岗岩地区的地质填图和普查找矿，科研工作均有借鉴意义。     

广西大容山——十万大山地区花岗岩单元超单元填图方法研究

本文较详细地叙述了广西大容山—十万大山花岗岩区运用单元超单元方法填图所取得的成果;总结了单元超单元填图的优越性;填补了国外S型花岗岩区成功地运用此方法填图的空白。     

花岗岩单元－超单元填图的理论基础划分标志与归并原则──以湖南省花岗岩划分成果和桂东试验区为例

本文综述了花岗岩单元—超单元填图的理论基础和分解岩体、划分侵入体的标志及单元、序列、超单元、超单元组合的归并原则，对花岗岩地区的地质填图和普查找矿、科研工作均有借鉴意义。     

福建花岗岩区试用单元—超单元填图方法

花岗岩区单元—超单元填图方法,是英国学者皮切尔教授在秘鲁海岸岩基段地区,通过几年的详细研究之后提出来的一种新的填图方法,它在国际上引起强烈的反响。近两年来,我们分队在承担福州地区1:5万区调工作中,对魁岐岩体南半部首次试用这种填图方法,取得了一些经验和较好的效果。现已初步查明魁岐复式岩体(超单元)是由钾长花岗岩、极细粒碱性长石花岗岩、碱性花岗岩、似     

单元—超单元填图方法在基性岩区的应用

借鉴花岗岩区单元—超单元填图理论方法 ,通过对乌增苏辉长岩体岩石学、岩石化学、微量元素、稀土元素等特征的研究 ,将岩体划分为四个单元     

花岗岩区单元-超单元-岩基段填图方法概述

近几年英、美等国加强对花岗岩地区的区域地质研究工作,采用了近似于对沉积岩区的填图方法。具有代表性的,是对秘鲁海岸花岗岩岩基填图中创立的单元-超单元-岩基段填图方法。该方法的理论基础是:花岗岩岩基是复式岩体;花岗岩岩基是多幕深成活动造成的;侵入体的成分和结构的分带,常是多次岩浆活动的产物。在填图中要解决的关键是:查明花岗岩岩基和岩体的内部结构;查明花岗岩的侵位序次;建立起不同等级的构造单元或填图单位;寻找岩基的典型地段和典型剖面。我国已在江西等省开始进行这种花岗岩地区新填图方法的实践工作。     

辽西察哈尔山和小和营超单元花岗岩地质特征

辽西务欢池－铁匠各冷地区中生代－晚古生代花岗岩体可划分为十一个填图单元,据岩体形成时间、侵入接触关系,岩体及岩石组构特征,可把这十一个花岗岩填图单元归并为小欧力营和察哈尔山两个超单元,两 个超单元主体岩性为钾长花岗岩和二长花岗岩,岩体成因类型属于壳幔混源型,二者岩源不同,小欧力营超单元同位素年龄为２６９Ｍａ,侵入时代为早二叠纪,为强力就位,察哈尔山超单元同位素年龄为１９０Ｍａ,侵位时代为早侏罗纪,岩石糜棱岩化明显,属于被动就位。     

西藏冈底期岩带尼木—曲水岩基段的解体

运用单元－超单元填图新方法对尼木－曲水岩基段进行了解体。建立了２６个侵入岩单元，其中归并７个超单元，２个超单元组合。讨论了各超单元内部不同单元之间的演化规律以及岩基段的发展，通过各单元，超单元特征研究，确定该区存在四种花岗岩系列，即Ｍ型，科迪勒拉Ⅰ型，加里东Ⅰ型和Ｓ型，后两类系列为该岩基段主体岩石类型，且具同碰撞花岗岩特征。     

西秦岭一带S型花岗岩区单元─超单元填图中稀土元素的作用

在花岗岩同源岩浆演化过程中，稀土元素的铕亏损和轻、重稀土的比值可以反映各单元岩浆演化的先后顺序，进而为花岗岩单元─超单元填图提供佐证。     

白马尖超单元组合特征及其成因机制

经详细填图，将白马尖复式杂岩体解体出９１个侵入体，归并６个单元，３个超单元，它们均属燕山期产物，物源于壳幔混合岩浆。岩石由花岗闪长岩二长花岗岩钾长花岗岩方向演化，岩浆活动由弱强弱，一幕一幕向上推进，呈向北东迁移趋势。区域构造活动和岩浆自身演化的双重因素制约了白马尖超单元组合。     

中基性侵入岩中-大比例尺专题地质填图实践——以河北武安铁矿集区填图试点为例

侵入岩类的填图方法伴随侵入岩成因分类、填图实践及研究技术手段发展而不断更新和完善。近20年来,由于新技术及新方法的应用,侵入岩的研究取得了长足的进步。研究表明,一个岩浆系统可能具有多个岩浆源区,单一岩浆房和全岩浆同时结晶模式在自然界几乎不能存在。因此,基于同源岩浆演化理论的"单元-超单元"填图方法似乎应该得到修正和完善。以河北武安铁矿集区填图试点为依托,总结出一套针对中性-基性侵入岩的填图方法——"岩浆系统-子系统"填图方法。运用该填图方法,在武安地区识别出6个岩浆成矿系统,在详细研究的基础上,对每个系统进行了若干子系统的进一步划分。在此基础上,厘清了每个系统的侵入岩组装过程及成岩成矿过程。     

The geosynclinal pair at the continental margin of Peru

The Andean geosynclinal pair in Peru consists of a eugeosynclinal marine andesitic volcanic trough and a miogeosynclinal sedimentary trough. Both troughs developed on a block-faulted basement of Precambrian crystalline rocks in which movement occurred along faults parallel to the continental margin. Subsidence in the eugeosyncline was most rapid during the Albian during which period about 7000 m of marine volcanics were deposited. In the miogeosyncline the greatest subsidence took place during the Tithonian but continued throughout the Cretaceous to accumulate a total thickness of about 6000 m. From the Late Cretaceous to the mid-Tertiary the Andean granitoid batholith was emplaced, mainly in the eugeosynclinal zone. A Benioff zone has been active at the continental margin from the Early Jurassic until the present so that the entire geotectonic cycle from the geosynclinal stage through to orogeny and uplift has taken place under a regime of active subduction.During the geosynclinal stage the sedimentary troughs developed in fault-bounded blocks which subsided under tension. It is possible to envisage crustal thinning within the subsident blocks by rotational movement on extensional faults or by plastic stretching of the lower crust. Stretching would be facilitated by the high geothermal gradient resulting from the emplacement of plutonics and volcanics and might be analogous to the formtion of marginal basins of western Pacific type. It is more difficult to account for the subsequent uplift for although the granites contributed to the crustal thickening, the main uplift did not occur in the granitic sector but further inland, and was moreover delayed for at least 20 m.y. after the last granites were emplaced.     

阿巴拉契亚造山带(纽芬兰岛)阿克利巨型花岗岩基地球化学填图及其成矿制约

阿巴拉契亚造山带加拿大纽芬兰岛东南部发育一晚泥盆纪阿克利巨型花岗岩基(～2500 km2).该岩基侵位于甘德和阿瓦隆地块的多佛-赫米蒂奇湾巨型断层带之间,内部发育钨-锡-钼矿床及相关的矿化.本文锆石年代学研究显示,岩基中Tolt单元侵位于378±2 Ma,各单元年龄基本一致,为同期岩浆多次侵位的产物.岩基中主要岩石类型...     

Large-scale coast-parallel displacements in the Cordillera: a granitic resolution to a paleomagnetic dilemma

Resolution of the `Paleomagnetic dilemma', the discrepancy between large paleomagnetically determined dextral displacement of outboard portions of the northern Cordillera, and much smaller offsets implied by mapping and stratigraphic correlations, is fundamental to understanding the tectonic evolution of the Cordillera. This paper presents structural orientation data from the middle Cretaceous Dawson Range batholith of west central Yukon and its wallrocks, and suggests that some of the `missing' displacement may be found in intrusions. The elongate northwest-trending batholith has a margin-parallel foliation, a sub-horizontal stretching lineation, and records syn-intrusive dextral shearing. In country rocks adjacent to the batholith, north-trending lineations are deflected clockwise into near parallelism with the batholith's margins; lineations from wallrock screens within the batholith are all aligned parallel with the batholith's long axis. The Big Creek strike-slip fault forms the north-margin of the batholith and accommodated a minimum of 20 km of dextral slip. These observations imply that the batholith invaded an active dextral shear zone, accommodated shearing while crystallizing, and focused post-crystallization fault development. The batholith is conservatively estimated to have accommodated 45 km of syn-intrusive shearing. Collectively, middle Cretaceous intrusions of the northern Cordillera may account for >400 km of previously unrecognized dextral displacement.     

高精度重力测量在香港石硖尾滑坡治理区的应用

介绍了采用5m网度的高精度重力测量进行工程勘查的方法技术，包括测地技术、重力测量技术和三维反演技术。通过对已知山顶建筑物工程设计参数进行重力影响的消除，实现了人文干扰的改正。采用精确的直立棱柱体理论重力异常正演公式进行正演，并采用广义逆的方法进行反演，获得了香港九龙石硖尾滑坡治理区新鲜花岗岩基顶面起伏的构造特征。与钻探结果对比表明，该花岗岩基顶面深度图结果可靠。     

The evolution of Central Asiatic geosynclines through sea-floor spreading

Late Precambrian-Early Paleozoic and Middle Paleozoic oceanic basins are reconstructed in the orogenic belt of Central Asia. These basins coincide with eugeosynclinal ophiolites which can be considered as remnants of a former oceanic floor. As these ophiolites are of decreasing age from the edges of the eugeosynclinal zones toward their centres, one can assume the creation of an ancient oceanic basin by a sea-floor spreading process. Restored oceanic basins can be considered as analogues of present marginal and inland seas. The distinct structural-magmatic zonal pattern came into existence during the generation of a given oceanic basin. This pattern appears to be governed by the ancient Benioff zone along which energy and light lithophile substance ascended as mantle diapir.     

Evidence for Neoproterozoic Continental Arc Magmatism in the Santa Quitéria Batholith of Ceará State,NW Borborema Province,NE Brazil: Implications for the Assembly of West Gondwana

Recent field investigations and geochronological studies of Neoproterozoic rocks in the northwestern part of the Borborema Province, Ceará State, NE Brazil provide important clues pertaining to the nature of convergence between the Borborema Province and the West African-São Luis craton during the assembly of West Gondwana. U-Pb zircon data indicate that the earliest evidence of convergent magmatism along the northwest margin of the Borborema Province occurred around 777 Ma, and was followed by the development of a large continental arc batholith (Santa Quitéria batholith) between ca. 665 and 591 Ma within the central part of Ceará State. These findings, along with supporting geophysical data, suggest that convergence between the Borborema Province and the West African-São Luis craton involved closure of an oceanic realm with subduction polarity to the southeast beneath the northwestern part of the province. Consequently, it seems likely that the Pharusian Ocean was continuous from the Hoggar Province in West Africa into South America during the late Neoproterozoic and additional data suggests that it may have even been connected with the Goianides Ocean of the Brasília Belt farther to the southwest.     

新疆西准噶尔花岗岩类的时代及其成因

在西准噶尔地区存在两期不同成因的花岗岩类,一期为与弧后盆地封闭有关的海西中期(305—320Ma)、以小岩体产出的花岗闪长岩-石英闪长岩;另一期为后造山的海西晚期(240—280Ma)的以巨大岩基形式产出的碱长花岗岩。     

北秦岭漂池岩体的源区特征及其形成的构造环境

北秦岭漂池花岗质岩基为早古生代岩浆活动的产物，岩石类型主要为二云母花岗岩。通过主要元素，微量元素及Ｎｄ，Ｓｒ，Ｏ同位素特征的分析，其成因类型为Ｓ型花岗岩，地物质来自壳源碎屑物，研究表明，秦岭群片麻岩类是形成漂池岩体的主要源岩，结合区域地质背景分析，岩体并不形成于板块碰撞环境，而形成北秦岭早古生代活动大陆边缘，受板块俯冲作用的动力学影响所诱发的陆缘地壳物质熔融的产物，因此，漂池岩体形成的构造类型是活     

西天山特克斯达坂花岗岩基的解体及钼找矿意义

通过详细的岩石学特征、接触关系、地质时代以及含矿性等研究,特克斯达坂岩基可解体为早石炭世库勒萨依序列和早二叠世其那尔萨依序列,其同位素年龄分别为347Ma和291~292Ma,地质调查已证实,两序列间为侵入接触关系。并于解体出的库勒萨依两序中新发现了斑岩型钼矿体。特克斯达坂岩基的解体,客观反映了岩浆活动的特征,不仅为深化区域成矿规律和指导进一步找矿具有重要意义,而且为丰富构造岩石组合资料和探讨本区大地构造演化有重要理论价值。