Timing of uplift in the Zagros belt/Iranian plateau and accommodation of late Cenozoic Arabia–Eurasia convergence
Timing of uplift in the Zagros belt/Iranian plateau and accommodation of late Cenozoic Arabia–Eurasia convergence
复制标题
扎格罗斯带/伊朗高原的隆起时间和晚新生代阿拉伯-欧亚大陆辐合的调节
作者：
F. Mouthereau
阿拉伯半岛相对于欧亚大陆的运动在过去22 Ma是稳定的。变形和折返在扎格罗斯被认为是在同一时间启动的新的碎屑热年代学的限制和增加的积累率在同造山沉积物。最近对扎格罗斯北方法尔斯地区Bakhtyari砾岩的磁性地层学测年进一步表明，扎格罗斯褶皱带的缩短和隆起在12.4 Ma后加速。从周围的碰撞带可用的时间限制表明，缩短和隆起集中在毗邻伊朗高原南部的地区之间的15和5马。由于边界速度保持不变，这就要求伊朗高原的应变率随之降低。板剥离已被提出来解释所观察到的变化以及地幔分层，但阿拉伯板运动的变化微不足道，缺乏明确的约束，使这两个假设难以解释。在对整个阿拉伯-欧亚大陆碰撞过程中提供的缩短估计进行审查的基础上，提出在过去22 Ma中通过大地测量和板块重建预测的总共440公里的会聚可以通过分布式缩短来解释。我认为，伊朗高原晚中新世-上新世时间的地形和扩张，可以复制的进步增厚原来薄伊朗大陆岩石圈推测热弱化始新世伸展和岩浆事件。
Abstract The motion of Arabia was stable with respect to Eurasia over the past 22 Ma. Deformation and exhumation in the Zagros is seen to initiate at the same time as argued by new detrital thermochronologic constraints and increasing accumulation rates in synorogenic sediments. A recent magnetostratigraphic dating of the Bakhtyari conglomerates in the northern Fars region of the Zagros further suggests that shortening and uplift in the Zagros Folded Belt accelerated after 12.4 Ma. Available temporal constraints from surrounding collision belts indicate that shortening and uplift focused in regions bordering the Iranian plateau to the south between 15 and 5 Ma. As boundary velocity was kept constant this requires concomitant decreasing strain rates in the Iranian plateau. Slab detachment has been proposed to explain the observed changes as well as mantle delamination, but the insignificant change in the Arabian slab motion and lack of unambiguous constraints make both hypotheses difficult to account for. It is proposed based on a review of shortening estimates provided throughout the Arabia–Eurasia collision that the total 440 km of convergence predicted by geodesy and plate reconstruction over the past 22 Ma can be accounted for by distributed shortening. I suggest that the topography and expansion of the Iranian plateau over Late Miocene–Pliocene time can be reproduced by the progressive thickening of the originally thin Iranian continental lithosphere presumably thermally weakened during the Eocene extensional and magmatic event.
影响因子：
4.2
作者：
P. Ballato;N. Nowaczyk;A. Landgraf;M. Strecker;A. Friedrich;S. Tabatabaei
通讯作者：
P. Ballato;N. Nowaczyk;A. Landgraf;M. Strecker;A. Friedrich;S. Tabatabaei
影响因子：
4.9
作者：
Ballato, Paolo;Uba, Cornelius E.;Tabatabaei, Saeid H.
通讯作者：
Tabatabaei, Saeid H.