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首页> 外文期刊>Journal of geodynamics >Architecture and Late Pliocene to recent evolution of outer-arc basins of the Hellenic subduction zone (south-central Crete, Greece)
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Architecture and Late Pliocene to recent evolution of outer-arc basins of the Hellenic subduction zone (south-central Crete, Greece)

机译：希腊俯冲带外弧盆地最近发展的建筑和上新世晚期（希腊中南部克里特）

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摘要

The Island of Crete is situated in the subaerially exposed part of the Hellenic fore-arc and was uplifted up to 1000-2000 m during Middle Pliocene to recent time. The onset of the overall emergence and northward tilting of central Crete was accompanied by the deposition of the continental Agia Galini Formation (AGF) during early Late Pliocene to Early Pleistocene time. The basin evolution during that time was probably related to sinistral wrench tectonics along ENE-WSW faults, which might have been active during an early stage of the incipient collision of the Hellenic fore-arc with the edge of the African continental plate at the longitude of western Crete. The development of the pronounced relief of south-central Crete strongly profits from a second stage of accelerated uplift and differential block movement starting not earlier than Early Pleistocene time or even later (post-AGF). Synchronously, the modern Timbaki basin and the extensive Messara basin (Messara plain) became striking elements in the study area. Across the study area, differences in both the morphostructural features and the amount of extension are obvious from the west to the east. Most likely, they reflect regional differences in the Pleistocene subduction process, due to the incipient continental collision at the longitude of western Crete. In the western part of the study area, arc-normal extension is driven primarily by the accumulation of high gravitational potential energy that results from the rapid uplift of the region. In the eastern part, the NW-SE to NNW-SSE regional extensional stress field is induced by the ongoing subduction of the oceanic African plate and the roll-back resulting in an arc-normal extensional component, and the extrusion of the Anatolian plate. The latter and the lengthening of the Hellenic arc, which is caused by the southward migration of the central part of the arc, support an arc-parallel extensional component. The Psiloritis Southern Escarpment Fault (PSEF) is one of the most prominent faults in the study area and represents the near-surface expression of a major normal detachment fault. Based on the footwall uplift mechanism vertical displacement along the PSEF intensifies the considerable asymmetric uplift of the Psiloritis massif that was induced by the regional rise of the outer-arc. In the study area a large number of faults have been identified that give clear evidence of recent activity.
机译：克里特岛位于希腊前弧的海底裸露部分，在上新世中期至最近时期隆升至1000-2000 m。克里特中部的整体出现和向北倾斜的开始伴随着上新世晚期至更新世早期大陆Agia Galini组（AGF）的沉积。那个时期的盆地演化可能与沿ENE-WSW断层的左旋扳手构造有关，该构造可能在古希腊前弧与非洲大陆板块边缘在东经初期碰撞初期就很活跃。克里特岛西部。克里特南部中部地区明显缓解的发展得益于第二阶段的加速抬升和块体运动差异，该阶段不早于更新世时间甚至更晚（AGF后）开始。同时，现代的廷巴基盆地和广阔的梅萨拉盆地（梅萨拉平原）成为研究区域的重要组成部分。在整个研究区域中，从西到东，形态结构特征和延伸量都明显不同。由于在克里特岛西部经度开始发生大陆性碰撞，它们很可能反映了更新世俯冲过程中的区域差异。在研究区域的西部，弧向法线扩展主要是由该区域快速隆升引起的高重力势能的积累驱动的。在东部，NW-SE到NNW-SSE的区域性张应力场是由持续进行的非洲大洋板块俯冲作用和回滚作用导致的弧向法向延伸分量以及安纳托利亚板块的挤压引起的。后者和希腊弧的延长是由弧的中心部分向南迁移引起的，支撑了弧平行的延伸分量。胸骨炎南部悬崖断层（PSEF）是研究区最突出的断层之一，代表着主要正常脱离断层的近地表表达。基于后壁抬升机制，沿PSEF的垂直位移加剧了由外侧弧的局部上升引起的胸膜炎隆起的相当大的不对称抬升。在研究区域，已发现大量断层，这些断层为近期活动提供了明确的证据。

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