斯匹茨卑尔根群岛韦特尔茄尔斯冰山地区海克拉霍克岩系褶皱特征与构造演化

本文讨论了韦特尔茄尔斯地区海克拉霍克岩系褶皱构造的特征:早期是一系列不同级别的平卧褶皱,并伴生有轴面片理S_1;晚期褶皱表现为不同时代、不同方向、不同类型的叠加褶皱,轴面近直立,有时伴有轴面劈理。叠加褶皱的类型有共轴和横轴重褶构造、两类不同横跨构造和被限制构造。该区经历了六个构造形变期,以相当于主加里东期的第二期(D_2)与喜马拉雅期的第五期(D_5)形变期最为重要。所有的构造形变均与基底断裂,尤其是与西侧滨外的斯匹茨卑尔根断裂带的活动有关。

THE FOLDING CHARACTERISTICS AND TECTONIC EVOLUTION OF HECLA HOEK SEQUENCE OF WEDEL JARLSBERG LAND, SPITSBERGEN

The folding characteristics of Hecla Hock Sequence in Wedel Jarlsberg Land were discussed. The early folding is represented by different orders of recumbent folds and associated axial-plane schistosities. The later folding is characterized by the superposition of folds of different ages and orientations, nearly-vertical axial-plane and rare cleavages. The superposed folds are typified by co-axis and cross-axis refolding structures, traversing structures and restricted structures. The area has undergone six stages of tectonic deformation with the second episode of Caledonian Movement (D_2) and the fifth episode of Himalayan Movement (D_5) as the most important ones. All deformations might be related to basement faulting, especially to activities of the offshore Spitsbergen Fault Zone.