MECHANISM FOR CRUSTAL THICKENING IN TIBET: A PALEOMAGNETIC VIEW

来源 :地震地质 | 被引量 : 0次 | 上传用户:yu19910108
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The mid-Gretaceous paleomagnetic pole for the Lhasa Terrane (69.8°N 292.9°E, A95 = 5.1°) is in strong discordance with that for the stable Eurasia (69.5°N 167.4°E, A95 = 8.7°), which suggests that the Lhasa Terrane has moved 2400±800 km NNEward and rotated 31.4±9.2 counterclockwise with respect to the stable Eurasia. The relative motion started at the time when the Indian plate began to collide with the Eurasian plate (or maybe started a little earlier), and was accomplished through the internal deformation of the southern Eurasian continent. As far as the mechanism is concerned for the crustal thickening in the Tibetan Plateau, the paleomagnetic data are therefore in favor of the internal deformation hypothesis within the Tibetan crust, but raise further challenge to the hypothesis of longdistance underthrusting of the Tibetan Plateau by the Indian subcontinent. The mid-Gretaceous paleomagnetic pole for the Lhasa Terrane (69.8 ° N 292.9 ° E, A95 = 5.1 °) is in strong discordance with that for the stable Eurasia (69.5 ° N 167.4 ° E, A95 = 8.7 °) the Lhasa Terrane has moved 2400 ± 800 km NNEward and rotated 31.4 ± 9.2 counterclockwise with respect to the stable Eurasia. The relative motion started at the time when the Indian plate began to collide with the Eurasian plate (or maybe started a little earlier) and was accomplished through the internal deformation of the southern Eurasian continent. As far as the mechanism is concerned for the crustal thickening in the Tibetan Plateau, the paleomagnetic data are therefore in favor of the internal deformation hypothesis within the Tibetan crust, but raised further challenge to the hypothesis of longdistance underthrusting of the Tibetan Plateau by the Indian subcontinent.
其他文献
由于薄层板性能、新型点样设备的进展和薄层展开设备、展开技术的不断创新,以及光密度扫描仪在可靠性及其它方面性能的改善,薄层色谱(TLC)技术正在复兴。本文将粗略介绍对复
一夫妻情爱犹如鲜花与干花,新婚燕尔时当然是鲜花烂漫,光彩照人,然终有枯萎的时节,聪明的智慧的女人得将新鲜的情爱巧制成干花,让它永远新鲜,经久不衰。专家们认为:爱情也受
聆听名师的课堂教学,无不为他们的教学思路、教学艺术、教学风格所折服、所吸引、所感动。在名师的教学中,贵在品悟名师们的教学细节,善于把自己置于名师的教学细节中,让自己
催化比色测定铱时镍盐对消除铑的干扰有特殊抑制作用已经得到证实。本文进一步指出镍盐也可抑制铂的干扰,可在无需进行任何分离手续的情况下用催化比色法测定铱。镍盐还可使
1985年6至8月奉派参加清华大学理科教育考察学习小组,考察了美国西部与东部的几所著名大学。其中有麻省理工学院、哈佛大学、耶鲁大学、加州理工学院、加州大学贝克莱分校、
乌江镇与江苏省仅一桥之隔,为和县的首镇和安徽省的东大门,已有2000多年的历史,楚汉之争的最后一幕项羽自刎就发生在这里。由于地理位置优越,水陆交通便利,所以历来商贾云集
该联合会成立于1919年。现有78个会员国。使用英、法二种语言。该联合会是国际科学联合大会(IUS)的20个成员组织之一。联合会下设7个成员学会:国际大地测量学会;国际地磁学
The etouchang-typeiron deposit is a typical stratabound deposit in the northern part of central Yunnan. The discussion centres on the controlling effect of the
21世纪,以计算机和网络通讯为核心的信息技术在社会各个领域中得到广泛应用,在任务化的学习环境中,将信息技术与语文教学整合,对于深化语文学科教学改革,提高教学效率以及培
基础教育课程改革纲要(试行)》中指出:新课程的培养目标要全面贯彻党的教育方针,全面推进素质教育,体现时代要求。要使学生具有爱国主义、集体主义精神,热爱社会主义,继承和