Crustal seismic velocity structure from Eratosthenes Seamount to Hecataeus Rise across the Cyprus Arc, eastern Mediterranean
Crustal seismic velocity structure from Eratosthenes Seamount to Hecataeus Rise across the Cyprus Arc, eastern Mediterranean
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地中海东部塞浦路斯岛弧上从埃拉托色尼海山到赫卡泰乌斯海隆的地壳地震速度结构
DOI：
10.1093/gji/ggu447
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发表时间：
2015
影响因子：
2.8
通讯作者：
Louden
中科院分区：
文献类型：
--
作者：
Welford;Hübscher;Reiche;Louden
从埃拉托色尼海山到塞浦路斯以南的赫卡塔埃乌斯海隆，记录了横跨塞浦路斯弧（非洲板块和爱琴海-安纳托利亚微板块之间的板块边界）的广角反射/折射地震剖面。由此产生的模型能够解决显着的横向速度变化的细节，虽然最深的地壳和莫霍面不能很好地解决单独的地震数据。模拟得出的结论表明：㈠埃拉托色尼海山由大陆地壳组成，但表现出横向变速结构，东北部的中地壳较厚，下地壳较薄; ㈡赫卡塔埃乌斯海隆在不确定的地壳上有厚的沉积岩覆盖层（可能是大陆），根据重力模型，地壳比埃拉托斯特尼海山薄得多;（iii）与磁场高点重合的高速基底块体出现在埃拉托色尼和赫卡塔埃乌斯之间的深水中，并被深低速槽分隔和界定;（iv）其中一个高速块体平行于塞浦路斯弧，而其他两个似乎连接基于磁性数据和运行西北东南，平行于边缘的赫卡塔厄斯隆起。埃拉托色尼海山边缘下方的高速块体被解释为一个较老的岩浆侵入体，而沿沿着赫卡塔埃乌斯海隆相连的高速块体被解释为变形的残留特提斯洋壳或基性岩侵入体，它们来自标志着埃拉托色尼海山北方边界的NNW-SSE向转换边缘。埃拉托色尼海山（Eratosthenes Seamount）是黎凡特边缘裂陷大陆地壳的西北边界，是下非洲板块北方边缘被转换断层横切的锯齿状裂陷边缘的一部分，该板块正斜向俯冲到爱琴海-安纳托利亚上板块之下。埃拉托色尼海山较厚的地壳可能作为一个凹凸的俯冲板，局部锁定塞浦路斯弧的俯冲在其北方边缘，而变形特提斯洋壳仍然被困在其东北边缘和Hecataeus隆起。
Wide-angle reflection/refraction seismic profiles were recorded across the Cyprus Arc, the plate boundary between the African Plate and the Aegean–Anatolian microplate, from the Eratosthenes Seamount to the Hecataeus Rise immediately south of Cyprus. The resultant models were able to resolve detail of significant lateral velocity variations, though the deepest crust and Moho are not well resolved from the seismic data alone. Conclusions from the modelling suggest that (i) Eratosthenes Seamount consists of continental crust but exhibits a laterally variable velocity structure with a thicker middle crust and thinner lower crust to the northeast; (ii) the Hecataeus Rise has a thick sedimentary rock cover on an indeterminate crust (likely continental) and the crust is significantly thinner than Eratosthenes Seamount based on gravity modelling; (iii) high velocity basement blocks, coincident with highs in the magnetic field, occur in the deep water between Eratosthenes and Hecataeus, and are separated and bounded by deep low-velocity troughs and (iv) one of the high velocity blocks runs parallel to the Cyprus Arc, while the other two appear linked based on the magnetic data and run NW–SE, parallel to the margin of the Hecataeus Rise. The high velocity block beneath the edge of Eratosthenes Seamount is interpreted as an older magmatic intrusion while the linked high velocity blocks along Hecataeus Rise are interpreted as deformed remnant Tethyan oceanic crust or mafic intrusives from the NNW–SSE oriented transform margin marking the northern boundary of Eratosthenes Seamount. Eratosthenes Seamount, the northwestern limit of rifted continental crust from the Levant Margin, is part of a jagged rifted margin transected by transform faults on the northern edge of the lower African Plate that is being obliquely subducted under the Aegean–Anatolian upper plate. The thicker crust of Eratosthenes Seamount may be acting as an asperity on the subducting slab, locally locking up subduction of the Cyprus Arc on its northern margin, while deformed Tethyan oceanic crust remains trapped between its northeastern margin and the Hecataeus Rise.
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