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Sedimentary response to a collision orogeny recorded in detrital zircon provenance of Greater Caucasus foreland basin sediments
Basin Research ( IF 2.8 ) Pub Date : 2020-08-06 , DOI: 10.1111/bre.12499 Alexander R. Tye 1 , Nathan A. Niemi 1 , Rafig T. Safarov 2 , Fakhraddin A. Kadirov 2 , Gulam R. Babayev 2
Basin Research ( IF 2.8 ) Pub Date : 2020-08-06 , DOI: 10.1111/bre.12499 Alexander R. Tye 1 , Nathan A. Niemi 1 , Rafig T. Safarov 2 , Fakhraddin A. Kadirov 2 , Gulam R. Babayev 2
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The Greater Caucasus orogen on the southern margin of Eurasia is hypothesized to be a young collisional system and may present an opportunity to probe the structural, sedimentary and geodynamic effects of continental collision. We present detrital zircon U‐Pb age data from the Caucasus region that constrain changes in sediment routing and source exposure during the late Cenozoic convergence and collision between the Greater Caucasus orogen and the Lesser Caucasus, an arc terrane on the lower plate of the system. During Oligocene to Middle Miocene time, following the initiation of deformation within the Greater Caucasus, marine sandstones and shales were deposited between the Greater and Lesser Caucasus, and detrital zircon age data suggest no mixing of Greater Caucasus and Lesser Caucasus detritus. During Middle to Late Miocene time, Greater Caucasus detritus was deposited onto the Lesser Caucasus basin margin, and terrestrial, largely conglomeratic, sedimentation began between the Greater and Lesser Caucasus. Around 5.3 Ma, upper plate exhumation rates increased and shortening migrated to pro‐ and retro‐wedge fold‐thrust belts, coinciding with the initiation of foreland basin erosion. Sediment composition, provenance and structural data from the orogen together suggest the existence of a wide (230–280 km) marine basin that was progressively closed during Oligocene to Late Miocene time, probably by subduction/lithospheric underthrusting beneath the Greater Caucasus, followed by initiation of collision between the Lesser Caucasus arc terrane and the Greater Caucasus in Late Miocene to Pliocene time. The pace of the transition from hypothesized subduction to collision in the Caucasus is consistent with predictions from numerical modeling for a system with moderate convergence rates (<13 mm/yr) and hot lower plate continental lithosphere. Basement crystallization histories implied by our detrital zircon age data suggest the presence of two pre‐Jurassic sutures between stable Eurasia and the Lesser Caucasus, which likely guided later deformation.
中文翻译：
大高加索前陆盆地沉积物碎屑锆石物源中记录的对碰撞造山作用的沉积反应
欧亚大陆南缘的大高加索造山带被认为是一个年轻的碰撞系统，可能为探讨大陆碰撞的结构，沉积和地球动力学效应提供机会。我们提供了来自高加索地区的碎屑锆石U-Pb年龄数据，这些数据限制了晚新生代收敛和大高加索造山带与小高加索之间的碰撞（在系统下盘的弧状地层）中沉积物路线和源暴露的变化。在渐新世至中新世时期，大高加索地区内部开始变形之后，海相砂岩和页岩沉积在大高加索地区和小高加索地区之间，碎屑锆石年龄数据表明大高加索地区和小高加索地区碎屑没有混合。在中新世中晚期 大高加索碎屑沉积在小高加索盆地边缘，陆相（主要是砾岩）沉积开始于大高加索和小高加索之间。在5.3 Ma左右，上板的发掘速率增加，并缩短了向前楔带和后楔带的褶皱冲断带的迁移，这与前陆盆地侵蚀的发生相吻合。来自造山带的沉积物成分，物源和结构数据共同表明，存在宽（230-280 km）的海洋盆地，该盆地在渐新世至中新世末期逐渐关闭，可能是通过俯冲/岩石圈下冲作用在大高加索地区之下，随后开始中新世至上新世晚期小高加索弧形地貌与大高加索之间的碰撞 在高加索地区，从假定的俯冲到碰撞的转变速度与数值算法对中等收敛速度（<13毫米/年）和热板下大陆岩石圈的系统的预测是一致的。我们的碎屑锆石年龄数据所隐含的基底结晶史表明，在稳定的欧亚大陆和小高加索地区之间存在两种侏罗纪前缝合线，这可能指导了以后的变形。
更新日期：2020-08-06
中文翻译：
大高加索前陆盆地沉积物碎屑锆石物源中记录的对碰撞造山作用的沉积反应
欧亚大陆南缘的大高加索造山带被认为是一个年轻的碰撞系统，可能为探讨大陆碰撞的结构，沉积和地球动力学效应提供机会。我们提供了来自高加索地区的碎屑锆石U-Pb年龄数据，这些数据限制了晚新生代收敛和大高加索造山带与小高加索之间的碰撞（在系统下盘的弧状地层）中沉积物路线和源暴露的变化。在渐新世至中新世时期，大高加索地区内部开始变形之后，海相砂岩和页岩沉积在大高加索地区和小高加索地区之间，碎屑锆石年龄数据表明大高加索地区和小高加索地区碎屑没有混合。在中新世中晚期 大高加索碎屑沉积在小高加索盆地边缘，陆相（主要是砾岩）沉积开始于大高加索和小高加索之间。在5.3 Ma左右，上板的发掘速率增加，并缩短了向前楔带和后楔带的褶皱冲断带的迁移，这与前陆盆地侵蚀的发生相吻合。来自造山带的沉积物成分，物源和结构数据共同表明，存在宽（230-280 km）的海洋盆地，该盆地在渐新世至中新世末期逐渐关闭，可能是通过俯冲/岩石圈下冲作用在大高加索地区之下，随后开始中新世至上新世晚期小高加索弧形地貌与大高加索之间的碰撞 在高加索地区，从假定的俯冲到碰撞的转变速度与数值算法对中等收敛速度（<13毫米/年）和热板下大陆岩石圈的系统的预测是一致的。我们的碎屑锆石年龄数据所隐含的基底结晶史表明，在稳定的欧亚大陆和小高加索地区之间存在两种侏罗纪前缝合线，这可能指导了以后的变形。
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