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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >Accretion, underplating and exhumation along a subduction interface: From subduction initiation to continental subduction (Tavsanli zone, W. Turkey)
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Accretion, underplating and exhumation along a subduction interface: From subduction initiation to continental subduction (Tavsanli zone, W. Turkey)

机译：沿俯冲界面的吸积，地下沉积和发掘：从俯冲开始到大陆俯冲（土耳其西北部，Tavsanli区）

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摘要

We herein reappraise the pressure-temperature (PT) evolution of the high-pressure and low-temperature (HP-LT) Tavsanli zone (western Turkey) in order to (i) better characterize rock units exhumed along a cooling subduction interface, from birth to steady state and (ii) constrain exhumation and detachment dynamics, as well as mechanical coupling between plates. Based on PT estimates and field observations three oceanic complexes are recognized between the HP-LT continental margin and the obducted ophiolite, with PT estimates ranging from incipient metamorphism to blueschist-fades conditions. PT conditions for the continental unit are reappraised to 24 kbar and similar to 500 degrees C on the basis of pseudosection modelling and Raman spectroscopy on carbonaceous material. A tentative reconstruction of the subduction zone evolution is proposed using available radiometric and palaeogeographic data and recent thermomechanical modelling. Both PT conditions and field observations point out to the slicing of km-sized units at different preferred depths along the subduction interface, thus providing constraints on the dynamics of accretion and underplating. In particular, the comparison of PT estimates for the Tavsanli zone and for other broadly similar fossil subduction settings (i.e., Oman, Corsica, New Caledonia, Franciscan, Schistes Lustres) suggests that units are detached preferentially from the slab at specific depths of 30-40 km (i.e., downdip of the seismogenic zone) and similar to 80 km. We propose that these depths are controlled by major changes in mechanical coupling along the plate interface, whereas exhumation through time would rather be controlled by large-scale geodynamic boundary conditions. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们在此重新评估高压和低温（HP-LT）Tavsanli区（土耳其西部）的压力-温度（PT）演化，以便（i）更好地表征沿冷却俯冲界面挖掘出的岩石单元从诞生之日起到稳态，以及（ii）限制挖掘和分离动力学，以及板之间的机械耦合。根据PT估计值和实地观察，在HP-LT大陆边缘和被蛇绿岩带之间发现了三个海洋复合体，PT估计值范围从初始变质到blueschist-fades条件。根据伪剖面模型和碳质材料的拉曼光谱，将大陆单元的PT条件重新评估为24 kbar，并类似于500摄氏度。利用可用的辐射和古地理数据以及最新的热力学模型，提出了俯冲带演化的初步重建方法。 PT条件和野外观测都指出了沿俯冲界面在不同首选深度处对km级单位进行切片，从而限制了吸积和下沉的动力学。特别是，对Tavsanli区和其他广泛相似的化石俯冲环境（例如，阿曼，科西嘉岛，新喀里多尼亚，方济各会，Schistes Lustres）的PT估计值的比较表明，单位优选在30- 40公里（即地震发生带的下倾角），与80公里相似。我们提出，这些深度是由沿板块界面的机械耦合的主要变化控制的，而随着时间的推移，发掘将由大规模的地球动力学边界条件控制。 （C）2015 Elsevier B.V.保留所有权利。

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