Processed seismic data of Cruise ME53 1980

In the period from February 13th to March 2nd 1980 4,037 km of magnetic, gravity and bathymetric lines and 1,195 km of digital reflection seismic lines were recovered on the 2nd leg of METEOR cruise no. 53. Heat flow measurements have been performed on 13 stations; on two stations sonobuoy refraction measurements and dredging have been carried out. From a preliminary interpretation of the seismic monitor records the Mazagan Plateau is part of the Moroccan Meseta. Seawards of this stable swell lies the 75 km wide, downfaulted rift graben characterized by salt diapirs. A submarine body, 150 square kilometres large, lying at the foot of the Mazagan Escarpment in water depths of 3000 m - 3800 m beneath sea level, from which western flank few granitic fragments were retrieved, is interpreted as a subsided and tilted block of the Mazagan Plateau. The north-trending magnetic anomalies, discovered during METEOR cruise no. 46 within the Essaouira continental margin segment have also been recognized within the Tafelney Plateau segment, situated between latitudes 30°45'N and 31°30'N off Morocco. Two neo-volcanic zones were found west of the Conception Bank and west of the Betancuria Massif/Fuerteventura Is. The Mesozoic and Tertiary depositional sequences are highly deformed by small piercement structures interpreted as dykes within these zones.1980年2月13日至3月2日期间，在“流星号”（METEOR）第53航次第二航段中，共获取4037千米的磁法、重力与水深测量测线，以及1195千米的数字反射地震测线。本次航次完成了13个站位的热流测量，其中2个站位开展了声呐浮标（sonobuoy）折射测量与拖网采样。通过对地震监测记录的初步解译，马扎甘高原（Mazagan Plateau）被认定为摩洛哥梅塞塔地块（Moroccan Meseta）的组成部分。该稳定隆起向海一侧分布着宽75千米的断陷裂谷盆地，其典型特征为发育盐底辟构造。一处位于马扎甘陡坡（Mazagan Escarpment）脚下、水深介于3000米至3800米之间、面积达150平方千米的海底体，其西侧斜坡仅回收少量花岗质岩屑，经解译认为是马扎甘高原沉降倾斜的断块。在摩洛哥近海纬度30°45′N至31°30′N之间的塔夫尔内高原（Tafelney Plateau）区段，同样识别出了“流星号”（METEOR）第46航次在埃萨乌伊拉（Essaouira）大陆边缘区段发现的北向磁异常。在康塞普西翁浅滩（Conception Bank）以西与贝坦库里亚地块（Betancuria Massif）/富埃特文图拉岛（Fuerteventura Is.）以西区域，共发现两处晚近火山活动带。上述区域内的中生界与第三系沉积层序，被解释为岩脉的小型刺穿构造强烈改造。