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Outer Cilicia Basin – A piggy back basin developed in an intramontane setting following the partitioning of a large ancestral Miocene basin across the northeastern Mediterranean
Tectonophysics ( IF 2.9 ) Pub Date : 2021-06-04 , DOI: 10.1016/j.tecto.2021.228952
A.E. Aksu , C. Yaltırak , J. Hall

Multichannel seismic reflection profiles show that the Outer Cilicia Basin evolved mainly during the uppermost Messinian–Quaternary as an asymmetric piggyback basin on the hanging wall of the large south-verging Kyrenia thrust culmination, following the partitioning of the much larger Miocene basin. A major north-verging backthrust and several similarly-verging smaller splays developed during the deposition of the uppermost Messinian–Quaternary succession, elevating the southern sector of the Outer Cilicia Basin ~250–500 ms above the central portion of the basin. An E–W trending zone characterized by 6–9 positive flower structures which are cored by the Messinian evaporite successions developed immediately north of the backthrust. Two prominent broadly E–W striking extensional fault zones define the tectonic framework of the north and south margins of the basin: (a) the Zafer–Kormakiti zone in the south with 5–6 internally parallel and invariably north-dipping large listric extensional faults developed immediately north of the Kyrenia Range and (b) the Anamur–Silifke zone in the north with 4–8 internally parallel and steeply north- and south-dipping planar faults defining a series of shore-parallel horst and graben structures developed immediately south of the Central Taurus Mountains. The Zafer–Kormakiti and the Anamur–Silifke fault zones are shown to be the westward extensions of the uppermost Messinian–Quaternary Misis–Kyrenia and Kozan fault zones, respectively. The tectonic framework of the Miocene successions across the Mut Basin delineated using >310 strike and dip measurements extracted from 1:25,000–1:100,000 maps supplemented by >1200 strike and dip determinations using the rule of Vs and construction of structure contours. These data revealed two distinct regional folds, where the anticlinal and synclinal axes are oriented WNW–ESE and NE–SW directions. Geological cross sections constructed suggest that the folds are likely cored by broadly southerly verging deep-seated blind thrusts.



中文翻译:

外奇里乞亚盆地 - 一个大型祖先中新世盆地横跨地中海东北部的划分后,在山内环境中形成的背负式盆地

多道地震反射剖面显示,外奇里乞亚盆地主要在最上层的墨西拿-第四纪演化为一个不对称的背负式盆地,位于大型偏南凯里尼亚逆冲断层顶峰的上盘上,继而分割了更大的中新世盆地。在最上层的墨西拿-第四纪层序沉积过程中,形成了一个主要的北向逆冲断层和几个类似的小裂片,将外西里西亚盆地的南段抬高到盆地中央部分以上约 250-500 毫秒。一个 E-W 趋势带的特征是 6-9 个正花结构,这些结构以墨西拿蒸发岩序列为核心,紧靠后冲断层以北形成。两个突出的宽东西向伸展断层带界定了盆地北缘和南缘的构造格架:(a) 南部的 Zafer-Kormakiti 带,有 5-6 条内部平行且始终向北倾斜的大型张性伸展断层紧靠凯里尼亚山脉以北和 (b) 北部的 Anamur-Silifke 带具有 4-8 条内部平行且陡峭的北向和南倾平面断层,定义了一系列与海岸平行的地堑构造中央金牛座山脉。Zafer-Kormakiti 和 Anamur-Silifke 断层带分别是最上部的墨西拿-第四纪米西斯-凯里尼亚和科赞断层带的向西延伸。Mut 盆地中新世序列的构造框架使用 > 从 1:25,000–1:100,000 地图中提取的 310 个走向和倾角测量值,并辅以使用 Vs 规则和构造轮廓构建的 >1200 个走向和倾角确定。这些数据揭示了两个不同的区域褶皱,其中背斜轴和向斜轴朝向 WNW-ESE 和 NE-SW 方向。构造的地质横截面表明,褶皱很可能被广泛偏南的深部盲冲断层所包围。

更新日期:2021-06-07
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