大别山北部的变质复理石推覆体     

刘贻灿  徐树桐  江来利  苏文  吴维平 《地质通报》1998,(2)

大别山北部的变质复理石推覆体属华北大陆板块南部的盖层推覆体,主要包括佛子岭群和卢镇关群。其时代主要为震旦纪—早古生代至泥盆纪。变质作用主要为角闪岩相—绿片岩相,在靠近变质蛇绿混杂岩带附近的部分（佛子岭群）可能曾经因卷入变质蛇绿混杂岩带而有过麻粒岩相或榴辉岩相（？）变质作用。变质复理石推覆体中岩石变形强烈,但不同地段变形程度不等。  相似文献   

Architecture and Kinematics of the Dabie Orogen,Central Eastern China   总被引：3，自引：0，他引：3  

XU Shutong  LIU Yican  CHEN Guanbao  WU Weiping Anhui Institute of Geology  Hefei  Anhui  Laboratory of Continental Dynamics of the Ministry of Land  Resources  Beijing 《《地质学报》英文版》2005,79(3):356-371

The geometry of the Dabie Mountains is manifested in terms of the distribution of petro-tectonic units in three dimensions. It is identified into three segments from east to west, four horizons in vertical profiles and eight petrotectonic units from north to south. Three segments are the east, middle and west segments. Four horizons, from top to bottom, are two different meta-tectonic melange in the uppermost part, underthrust basement and cover below them, and mantle at the bottom of the profiles. Eight petro-tectonic units from north to south are: (1) the hinterland basin, (2) the meta-flysch, (3) the ultramafic rock belt (UM) Sujiahe eclogite belt (SH), (4) eclogite belt 2 (Ec2) with most eclogites of continental affinity, (5) eclogite belt 1 (Ecl1) with some eclogite of oceanic affinity, (6) the Dabie complex or underthrust basement of the Yangtze continent, (7) the Susong and Zhangbaling Groups or underthrust cover of the Yangtze continent and (8) the foreland belt. The (3), (4) and (5) units belong to meta-tectonic melange. Some ultrahigh pressure metamorphic minerals such as coesite and micro-diamonds have been found in (3) and (4) units; a possible ultrahigh pressure mineral,clinozoisite aggregate pseudomorph after lawsonite, was found in unit (5). The three tectonic units are speculated to be coherent initially; the UM and SH units are suggested to be the root belt in the east, middle and west segments respectively.The kinematics of the Dabie orogen is divided into three stages: top-to-south thrusting during the eclogite-granulite facies metamorphism, top-to-north extension during the amphibolite metamorphic stage, and faults or shear bands of brittle deformation and greenschist facies metamorphism were formed in the post-orogenic stage since the Late Jurassic and the movement pictures of these faults is different from each other.  相似文献   

北大别的多期深熔作用及山根垮塌的新证据          下载免费PDF全文

刘贻灿  杨阳  李洋 《地质科学》2019,54(3):664-677

大别山是由华南板块在245～210 Ma向华北板块之下俯冲并发生陆陆碰撞形成的。随着南、北板块的汇聚继续,地壳持续加厚。然而,加厚的下地壳岩石（特别是镁铁质下地壳岩石）在重力作用下密度增大、稳定性降低,在145～130 Ma 时发生深熔作用;130 Ma 左右加厚下地壳拆沉,引发软流圈上涌,产生了130～110 Ma的大规模镁铁质和花岗质岩浆作用以及北大别发生强烈的混合岩化作用。其中,北大别混合岩中不同类型浅色体（至少可以分为4种）和碰撞后变质闪长岩的甄别及其岩石地球化学和同位素年代学方面系统研究为大别山印支期深俯冲陆壳的折返以及燕山期镁铁质下地壳岩石拆沉和山根垮塌所引发的多期深熔作用提供了新的关键证据。山根垮塌诱发的地幔对流导致～145 Ma时岩石圈开始减薄,进而导致加厚镁铁质下地壳温度和地壳中下部地热增温率升高,并使其发生部分熔融;加厚下地壳的部分熔融导致造山带下地壳持续弱化,加剧其重力不平衡,从而引发深部俯冲的镁铁质下地壳岩石的大规模拆沉和山根垮塌。  相似文献   

Multistage Metamorphic Evolution and P-T-t Path of High-T Eclogite from the North Dabie Complex Zone during Continental Subduction and Exhumation     

LIU Yican  DENG Liangpeng  GU Xiaofeng  GROPPO Chiar  and ROLFO Franco 《《地质学报》英文版》2016,90(2):759-760

正Objective High-T eclogites from the North Dabie complex zone(NDZ),central China underwent a complex metamorphic evolution involved in ultrahigh-pressure(UHP)and highpressure eclogite-facies metamorphism,and subsequent  相似文献   

大别山超高压变质带面理化榴辉岩中变形石榴石的几何学和运动学特征及其大地构造意义   总被引：12，自引：4，他引：8  

Xu Shutong  Liu Yican  Su Wen  Wu Weiping  Jiang Laili  Wang Rucheng. 《岩石学报》1999,15(3):321-337

大别山东部双河附近面理化榴辉岩中, 所有榴辉岩相矿物包括石榴石、绿辉石乃至金红石都受到强烈拉伸。用透射电镜可以观察到石榴石晶体中塑性变形的显微构造, 包括自由位错、位错环、位错壁和位错网。拉伸石榴石的应变轴比表现为 Ｘ＞ Ｙ＞ Ｚ。运动学标志如石榴石的不对称碎斑和旋转的金红石颗粒, 表明有旋转应变的作用。石榴石和金红石的福林系数分别为１１８ 和０９８。所有这些都表明石榴石是在接近于平面应变的条件下形成。由于石榴石颗粒在应变前后体积未变,因此也是在简单剪切作用条件下形成的。根据石榴石韧性变形要求的温度条件, 此种变形应在榴辉岩相条件下发生, 代表一次向南的逆冲作用, 经过展开后, 逆冲的方向为南西。根据石榴石的流变律, 其韧性变形的最低温度估计约为 ８００℃。石榴石中普遍有一组透入性破劈理, 它产生于面理化榴辉石折返后的角闪岩相早期, 形成于石榴石韧性变形之后。破劈理及其中反Ｓ形破劈理的运动指向表明有向北的滑动, 发生在主簿源复背斜形成之前; 主簿源复背斜使面理化榴辉岩的产状由倾向北改变为倾向南。根据面理化榴辉岩及其围岩的同位素年龄, 估算出面理化榴辉岩在２００～１９０ Ｍａ 期间的平均垂直折返速率为９ｍ ｍ ／ａ。此外, 还  相似文献   

倾斜立体影像的Shi-Tomasi特征匹配     

赵琛琛  龚志辉  龙怡灿  孙晓昱  李劲澎 《测绘科学技术学报》2015,(1):66-71

针对倾斜影像畸变大的现象,提出一种适用于倾斜立体影像匹配的方法。首先采用基于SIFT算法的匹配点对消除影像间的射影失真;然后提取Shi-Tomasi特征并采用多窗口的归一化互相关系数(NCC)计算相似性测度,获得稳定的匹配点对;最后使用两组倾斜影像将该算法同SIFT算法和ASIFT算法进行综合对比分析。实验结果表明,所提算法在正确匹配点对数量、匹配点对分布及匹配精度上均优于其他两种算法。  相似文献   

Eclogites from the Northern Dabie Mountains,eastern China: Geochemical characteristics,Sr−Nd isotopic compositions and tectonic implications     

Liu Yican  Xu Shutong  Li Shuguang  Jiang Laili  Wu Weiping  Chen Guanbao  Su Wen 《中国科学D辑(英文版)》2000,43(1):178-188

The petrologic geochemical and Sr?Nd isotopic compositions of the eclogites from the mafic-ultramafic rock belt (MUMRB) in the Northern Dabie Mountains indicate that: (1) the protoliths of most of eclogites are tholeitic basalt and a few may be gabbro, and most of them produced from the Yangtze subducted continental crust (lower crust and formed during the deep subduction) and a part may be from paleo-oceanic relics between the Yangtze and North China continental plates; (2) their positive Nb anomalies and related trace element characteristics show that they did not form in the island-arc setting; (3) the metamorphosed MUMRB with eclogite and meta-peridotite blocks along the southern part of the Mozitan-Xiaotian fault zone may represent the suture zone produced during the collision between the Yangtze and North China continental plates, which included the Yangtze subducted continental crust and paleo-oceanic relics.  相似文献   

Eclogites from the Northern Dabie Mountains,eastern China: Geochemical characteristics,Sr−Nd isotopic compositions and tectonic implications     

Liu  Yican  Xu  Shutong  Li  Shuguang  Jiang  Laili  Wu  Weiping  Chen  Guanbao  Su  Wen 《中国科学:地球科学(英文版)》2000,43(1):178-188

The petrologic geochemical and Sr−Nd isotopic compositions of the eclogites from the mafic-ultramafic rock belt (MUMRB) in the Northern Dabie Mountains indicate that: (1) the protoliths of most of eclogites are tholeitic basalt and a few may be gabbro, and most of them produced from the Yangtze subducted continental crust (lower crust and formed during the deep subduction) and a part may be from paleo-oceanic relics between the Yangtze and North China continental plates; (2) their positive Nb anomalies and related trace element characteristics show that they did not form in the island-arc setting; (3) the metamorphosed MUMRB with eclogite and meta-peridotite blocks along the southern part of the Mozitan-Xiaotian fault zone may represent the suture zone produced during the collision between the Yangtze and North China continental plates, which included the Yangtze subducted continental crust and paleo-oceanic relics.

  相似文献   

Tectonic Affinity, T-t Path and Uplift Trajectory of Eclogites from Northern Dabie Mountains, Central-Eastern China   总被引：2，自引：0，他引：2  

Liu Yican Department of Earth  Space Sciences  USTC  Hefei  Anhui Ins titute of Geology  Hefei Xu Shutong Anhui Institute of Geology  Hefei Li Shuguang Department of Earth  Space Sciences  USTC  Hefei Jiang Laili Chen Guanbao Wu Weiping Anhui Institute of Geology  Hefei 《中国地质大学学报(英文版)》2003,14(1):28-33

INTRODUCTIONTheDabieMountainsaretheeasternsectionoftheE WtrendingQinling DabieorogenicbeltbetweentheNorthChinablockandYangtzeblock ,andistransectedatitseasternendbyTan Lufault.Ultrahigh pressuremetamorphic (UHPM)rocksincludingcoesites (Okayetal.,1989;Wangetal.,1989)andmicrodiamonds (Xuetal.,1992b)bearingeclogitesareexposedintheDabieMountainsandSu Luorogen ,whichisthelargestUHPMbeltontheearthsurface .TheUHPMrocksarecomposedofdifferentkindsofmetamorphicrockssuchascoesite anddiamo…  相似文献   

中国南方东部震旦系碳酸盐岩成岩作用   总被引：2，自引：0，他引：2  

杜森官 《安徽地质》1997,(2)

中国南方震旦系碳酸盐岩出现的成岩作用主要有胶结、白云化、去白云化、硅化、去硅化、重结晶、溶解、充填作用等，经历了同生、成岩、后生、表生四个成岩作用阶段，各阶段出现的成岩作用有一定的变化。本区晚震旦世为两个碳酸盐台地和两个盆地相间的古地理格局，处在盆地的不同部位，呈现不同的成岩作用类型。  相似文献