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黔东地区典型构造样式特征及其地质意义 总被引：5，自引：2，他引：3
黔东地区发育中、新元古代至新生代地层和多种类型的岩浆岩、变质岩, 存在多期次构造运动, 主要可划分为武陵构造旋回期、加里东构造旋回期、燕山构造旋回期和喜马拉雅旋回期。形成的典型构造样式分别有阿尔卑斯式褶皱、侏罗山式褶皱、逆冲推覆构造、韧性剪切带、变质核杂岩构造及伸展剥离断层系、平行走滑断层系、地垒—地堑构造等。在不同的构造旋回期, 其构造样式的差异反映出了所处构造位置的不同, 进而在平面上反映出江南造山带是由不同时期的造山亚带组成且具有向东迁移的演化历史的复合造山带。 相似文献
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试论江南造山带西南段构造演化--以黔东及邻区为例 总被引：9，自引：2，他引：9
江南造山带西南段，黔东及邻区，位于扬子陆块与华南陆块的过渡区，发育中、新元古代至新生代地层和多种类型的岩浆岩、变质岩，存在多期次构造运动，可划分出洋陆转换阶段的武陵构造旋回期、加里东构造旋回期和板内活动阶段的海西一燕山构造旋回期、喜马拉雅构造旋回期。具有从洋陆转换阶段的B型俯冲造山向板内活动阶段的A型俯冲造山演化、从活动型地壳向稳定型地壳的演化历程，是一个由不同时期、不同性质的造山作用构成的复合造山带，反映出扬子陆块向东南增生及江南造山带向东南迁移的演化历史。 相似文献
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南岭地区与中生代花岗岩类有关的有色、稀有金属矿床地质 总被引：2，自引：0，他引：2
<正> 南岭成矿区是指东西横亘于湘、桂、粤间的五岭山脉和赣、粤间九连山脉及其邻区有色、稀有金属矿床比较集中及其成矿作用相似的地区。 该区处于古亚洲构造城、特提斯-喜马拉雅构造域和滨西太平洋构造域的交叉复合部位,是多构造体系的联合作用地区。区内大地构造的发展历经地槽、地台和大陆边缘活动带三大阶段,包括雪峰、加里东、海西—印支、燕山和喜马拉雅各期运动,其中加里东期和印支期分别结束了地槽和地台的发展历史,燕山期是大陆边缘活动的鼎盛时期,是本区花岗岩成岩、成矿带重要时期。 相似文献
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贵州在海西—燕山构造旋回期同时受东南侧江南复合造山带和西南侧特提斯域的发展演化影响,从晚古生代开始发生陆内裂陷,三叠纪初转化为前陆盆地,燕山运动使贵州进入板内造山阶段,形成前陆盆地典型褶皱样式侏罗山式褶皱和浅层滑脱构造等。其裂陷盆地和前陆盆地控制了沉积型、喷流沉积型矿产资源的时空产出,代表性矿种有煤、锰、铝土矿、烃源岩及页岩气等。而以金锑砷汞、铅锌、软玉等内生热液型、沉积改造型矿产明显受浅层滑脱构造、板内岩浆岩控制。由于该时期贵州所处前陆盆地之构造位置,形成了贵州非常有特色的中低温成矿域。 相似文献
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贵州雪峰-加里东构造旋回期成矿地质背景研究 总被引：2，自引：0，他引：2
武陵运动后,雪峰-加里东构造旋回期贵州呈现台地斜坡盆地沉积格局,经历了裂陷洋盆至前陆盆地的演化历程,发育不同背景下的岩浆岩组合。广西运动形成加里东期造山带,此时贵州从东向西分别位于造山带内带、外带和前陆位置,区域变质作用随之逐渐减弱,同时发育逆冲推覆断层、变质核杂岩构造等。其裂陷洋盆、前陆盆地控制了沉积型、喷流沉积型矿产,代表性矿种有锰、磷、重晶石、镍钼钒、铅锌、烃源岩及页岩气等;而金、铜、铅锌、金刚石等内生热液型、沉积改造型矿产明显受变质核杂岩构造、板内岩浆岩控制。 相似文献
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广东区域构造及与银矿的关系 总被引：3，自引：0，他引：3
广东大地构造位于华南加里东地槽褶皱系.其地质构造划分出雪峰—加里东、海西—印支、燕山和喜山4大构造层.主要深—大断裂带分为NE向深—大断裂带、EW向断裂—岩浆岩带和NW向大断裂带.广东银矿床产布主要受海西—印支构造层和NE向深—大断裂带的控制,大多数银矿床分布于粤中—粤西雪峰—加里东褶皱区内,尤其是不同级别构造单元的接触过渡地带.独立、共生银矿床与区域构造关系更为密切. 相似文献
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本文以活动论的大地构造学说为指导,对贵州新元古代至今约870百万年的地质记录进行了构造-建造的划分。以威尔逊旋回及造山作用不整合界面为依据,将其分为武陵、扬子—加里东、海西—印支、燕山和喜马拉雅5个构造层,并简述了它们的基本特征;按控制原型盆地动力背景的不同,划分出10个亚构造层,分别注明它们在地壳结构中的所处部位——盖层或基底。依据一定地质时期和环境条件下形成的、有成因联系的岩石共生组合不同,分别划分出沉积建造49个、岩浆建造9个,并指出它们的含矿性。从而建立了贵州构造-建造完整体系,为重塑贵州地壳构造演化和探讨成矿规律奠定了基础。 相似文献
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西秦岭造山带处于古亚洲构造域、特提斯构造域和滨太平洋构造域交汇的特殊地段,是中国中央造山带的关键部位,成为中国大陆构造中一个独特的构造单元。该构造单元存在一系列弧顶向南的EW向弧形构造,弧形构造格局是经历了印支—燕山—喜马拉雅期陆陆碰撞和陆内推覆造山长期的继承性构造演化形成的。 相似文献
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一批地质标准物质通过部级鉴定１９９４年５月２０日～２１日全国地质矿产标准化技术委员会岩矿测试标准样品及方法分技术委员会在北京举行会议，组织评审了一批地质标准物质，通过了“黄铁矿、黄铜矿、方铅矿和闪锌矿４种矿物标准物质的研制”、“铅锌、铅锌铜、镍钴、钨... 相似文献
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《International Geology Review》2012,54(8):1374-1386
Discusses some basic problems with geologic, geochronologic, and paleoclimatological implications. The paper addresses itself mainly to the problem of Quaternary geology, including European classification of multi-glacial,deposits, geologic correlation of non-contemporaneous climatostratigraphic,divisions, climatic and geologic rhythms, and late Würm or post-Würm. The paper includes a chart summarizing local climatostratigraphic and geochronological subdivisions, dated by radiocarbon and ionium methods. Somewhat visionary, but nonetheless stimulating views are expressed, on the differences between climatostratigraphy and the usual brand of stratigraphic framework. Some overtones of the discussion may be of interest to those who desire to explore the philosophies of Quaternary stratigraphy and geochronology. One general conclusion emerges which affirms a-self-evident fact — Pleistocene stratigraphy must have its own ground rules to be meaningful and to reflect the depth of detail that can be derived from all the combinations of all applicable techniques for 'study of those complex deposits. — B. N. Cooper. 相似文献
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Jun-Mo Kim 《Mathematical Geology》2005,37(8):929-941
On the basis of vectorial formulation, a series of relatively simple closed-form mathematical equations is presented to determine
the direction cosines of the local coordinate axes associated with planar and linear structures in an anisotropic geologic
material from their geologic angle measurements (i.e., strike and dip for planar structures and trend and plunge for linear
structures). The equations are then applied to calculation of global anisotropic hydraulic conductivity and elastic stiffness
tensors with respect to the geographical coordinate axes from their local counterparts with respect to the material symmetry
axes. 相似文献
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Francis J. FLANAGAN Roosevelt MOORE Philip J. ARUSCAVAGE 《Geostandards and Geoanalytical Research》1982,6(1):25-46
The mercury contents of 109 reference samples of 12 organizations have been determined by flameless atomic absorption spectrometry. The homogeneity of mercury in the six USGS samples issued in 1964 was tested twice, a year apart, using unopened bottles of samples. The analysis of variance of these data in the form of a design with a single variable of classification showed that the mercury contents of the 12 sets can be considered homogeneous at F 0.95 and that 10 of these sets can be considered homogeneous at F 0.90 , a more stringent test.
Data for other reference samples were generally obtained using Youden Squares. This experimental design was used so that we could determine the significance of the variation attributable to some cause on the days on which mercury was determined, to the order in which the determinations were made on the several days, and to the mercury contents of the samples in each design. For the latter, one may assume that the mercury contents of samples will differ and that a significant F ratio may be obtained. For the principal variable of classification, the variation attributable to some cause on the days on which mercury was determined was significant for only 1 of 9 analyses of variance of sets of data but we have not been able to explain the cause of the significance.
The mercury contents of the several types of samples, except for micas, dunites, and perhaps the granodiorites, depend on the origin of the samples. The mercury contents of ande-sites and basalts of continental origin are higher than those for similar samples originating in island arcs or the circum-Pacific belt. We conclude that the high and extremely variable mercury content of W-1 is probably due to mercury resulting from the use of mercury fulminate detonators in the quarry prior to the collection of the sample. 相似文献
Data for other reference samples were generally obtained using Youden Squares. This experimental design was used so that we could determine the significance of the variation attributable to some cause on the days on which mercury was determined, to the order in which the determinations were made on the several days, and to the mercury contents of the samples in each design. For the latter, one may assume that the mercury contents of samples will differ and that a significant F ratio may be obtained. For the principal variable of classification, the variation attributable to some cause on the days on which mercury was determined was significant for only 1 of 9 analyses of variance of sets of data but we have not been able to explain the cause of the significance.
The mercury contents of the several types of samples, except for micas, dunites, and perhaps the granodiorites, depend on the origin of the samples. The mercury contents of ande-sites and basalts of continental origin are higher than those for similar samples originating in island arcs or the circum-Pacific belt. We conclude that the high and extremely variable mercury content of W-1 is probably due to mercury resulting from the use of mercury fulminate detonators in the quarry prior to the collection of the sample. 相似文献
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孙快忠 《前寒武纪研究进展》2013,(4):305-310
根据钻孔原位测试和岩土样品试验室分析结果,对奉化江、姚江面积约600km。流域的工程地质结构进行了研究,并对流域地表以下60m范围内进行了工程地质分区和工程地质问题探讨。结果表明：（1）全新统镇海组有3个工程地质层和5个亚层,上更新统宁波组有3个工程地质层和20个亚层,下伏基岩归入1个基岩工程地质层;（2）可选用的持力层为④1、④3-2、④3-3、⑤1、⑤3-1、⑤3-2、⑥1、⑥3-1、⑥3-2、⑥4工程地质亚层和基岩工程地质层,持力层地基承载力特征值fak≥160kPa;（3）流域内有两个硬土层,即岩性为粉质粘土的第一硬土层④1和第二硬土层⑤1;（4）根据各持力层的厚度和组合分布特征,研究区被划为6个工程地质分区,并提供了每一个工程地质分区的持力层、基础类型;（5）主要工程地质问题是地面沉降和软土震陷。 相似文献
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漳浦复式岩体位于长乐一南澳断裂带南段,是一个大型的燕山期复式岩体。前人将该复式岩体划分为早侏罗世、晚侏罗世、早白垩世早期、早白垩世晚期、晚白垩世等5期侵入岩。其中,早侏罗世、晚侏罗世、早白垩世早期侵入岩都具有韧性变形、变质的特征,而早白垩世晚期、晚白垩世侵人岩则未发生韧性变形、变质作用。通过对变质侵入岩锆石微区（LA—... 相似文献