Raw data from a wide-angle seismic survey in the Grenada Basin

The main objectives of the GARANTI cruise (Geodynamical conditions for Aves Ridge and the Lesser ANTIlles arc splitting) concern the geodynamic conditions that prevail during the splitting between the north-south-trending Aves Ridge, an extinct volcanic arc back of the Lesser Antilles, and the present volcanic arc sitting on the Atlantic edge of the Caribbean Plate. Modalities of the stretching are poorly constrained and thus controversial. During the 2017 Garanti cruise, three combined wide-angle and reflection seismic profiles, together with gravity and magnetic data, were acquired in the Lesser Antilles Backarc. The resulting velocity models show the sedimentary and crustal structures along Aves Ridge, the Grenada Basin and the modern arc.

GARANTI航次（Geodynamical conditions for Aves Ridge and the Lesser Antilles arc splitting，即阿韦斯海脊与小安的列斯弧分裂的地球动力学条件）的核心目标是探究南北走向的阿韦斯海脊（小安的列斯弧后方的灭绝火山弧）与加勒比板块大西洋边缘现代火山弧之间分裂过程中的主导地球动力学条件。拉伸作用的模式约束不足，因此存在争议。2017年GARANTI航次期间，在小安的列斯弧后盆地采集了三条广角与反射地震联合剖面，以及重力和磁测数据。由此构建的速度模型揭示了阿韦斯海脊、格林纳达盆地及现代火山弧沿线的沉积与地壳结构。