Experimental data of analogue models of subduction investigating the interplays between mantle flow and slab pull

This dataset includes images depicting the evolution in map view and lateral view of 7 analogue experiments of subduction to better understand the interplays between slab pull and mantle flow at subduction zones. The experiments are performed under a natural gravity field and are designed to understand the influence of plate width and magnitude and direction of mantle flow on slab geometry, trench kinematics and shape, and superficial mantle deformation around the subduction zone. All experiments were performed at the Laboratory of Experimental Tectonics at the Università Roma Tre (Italy). The laboratory models consist of one viscous layer of silicone putty representing the subducting lithosphere resting on top of a tank filled with glucose syrup, representing the convective mantle. We impose a horizontal flow in the convective mantle by pushing at a constant velocity a piston in the glucose syrup below an intermediate horizontal plate representing the upper mantle-lower mantle discontinuity. The pictures show the time evolution of each experiment from the top (« top » folder) and lateral position (« lateral » folder) and were taken synchronously every 30 seconds, and downsampled to 5 minutes in this dataset. The entire set of pictures are available from the authors upon request. Model F14 is the reference model, without imposed mantle flow and with a slab width of 2000. Models F15 and F16 are models with 660 km and 4000 km, respectively. They allow us analyzing the effect of slab width in the absence of a background flow. Models F17 and F20 are models with slab width of 2000 km and a background flow coming from above the slab at velocities of 0.9 and 1.8 mm/min in the lab (corresponding to 0.9 and 2 cm/yr once scaled to nature), respectively. Models F24 and F26 are models with slab width of 2000 km and a background flow coming from below the slab at velocities of 0.9 and 1.8 mm/min in the lab (corresponding to 1.2 and 2.7 cm/yr once scaled to nature), respectively. For details on the experimental set-up, monitoring techniques and interpretation of the results, please refer to Guillaume et al. (2021) to which these data are supplementary material.

本数据集包含7项俯冲作用（subduction）类比实验（analogue experiments）的俯视图（map view）与侧视图（lateral view）演化序列图像，旨在深入理解俯冲带（subduction zone）内板片拉力（slab pull）与地幔流（mantle flow）之间的相互作用机制。本系列实验在自然重力场条件下开展，旨在探究板块宽度、地幔流的强度与方向，对俯冲带板片几何形态、海沟运动学特征与形态，以及俯冲带周围浅层地幔变形的影响。所有实验均在意大利罗马第三大学（Università Roma Tre）实验构造学实验室完成。实验模型以一层粘性硅酮腻子（silicone putty）作为俯冲岩石圈，将其置于装满葡萄糖浆（glucose syrup）的实验槽顶部，以模拟对流地幔（convective mantle）。我们通过在代表上下地幔间断面（upper mantle-lower mantle discontinuity）的中间水平板下方的葡萄糖浆中以恒定速度推动活塞，为对流地幔施加水平流场。图像分别从俯视视角（「top」文件夹）与侧视视角（「lateral」文件夹）展示了每项实验的时间演化过程，所有图像均以每30秒的间隔同步拍摄，本数据集已将其降采样至每5分钟一组。完整的图像集可应要求向作者索取。F14模型为参考模型，未施加地幔流，板片宽度为2000千米。F15与F16模型的板片宽度分别为660千米与4000千米，二者均未施加背景地幔流，用于探究无背景流条件下板片宽度的影响效应。F17与F20模型的板片宽度均为2000千米，分别施加来自板片上方的背景地幔流，实验室条件下流速为0.9 mm/min与1.8 mm/min（缩放至自然尺度后分别对应0.9 cm/yr与2 cm/yr）。F24与F26模型的板片宽度均为2000千米，分别施加来自板片下方的背景地幔流，实验室条件下流速为0.9 mm/min与1.8 mm/min（缩放至自然尺度后分别对应1.2 cm/yr与2.7 cm/yr）。有关实验装置、监测技术与结果解读的详细信息，请参阅Guillaume等人（2021）的研究，本数据集为该文献的补充材料。