Scales of Variability in Ridge Segmentation and Structure Along the MAR in Central North Atlantic

这项研究旨在建立北大西洋中部相当长的大西洋中脊的形态特征、分段几何和结构，并检验关于沿缓慢扩展的大洋中脊的地壳增长过程的假说。需要解决的问题是：(1)亚速尔群岛热点对形态、节段几何、中大西洋海脊的结构？(2)北大西洋中部的主要断裂带是否以显著不同的分段样式和波长将中大西洋海脊的部分分开？(3)大西洋中脊地幔布格异常模式的差异与段间地形构造变异性有何关系？(4)传统地质构造的相对丰度是多少中大西洋海脊的转换断层和非转换不连续？(5)是什么控制了建造，中大西洋海脊上非变换偏移量的稳定性和演化？主要调查员将参加法国L阿塔兰特号轮船的两次巡航。

This research is designed to establish the morphological character, segmentation geometry, and structure of a significant length of the Mid-Atlantic Ridge in the central North Atlantic, and to test hypotheses on crustal accretion processes along a slowly spreading mid-ocean ridge. Questions to be addressed are: (1) What is the effect of the Azores hotspot on the morphology, segmentation geometry, and structure of the Mid-Atlantic Ridge? (2) Do major fracture zones in the central North Atlantic separate portions of the Mid-Atlantic Ridge with significantly different styles and wavelengths of segmentation? (3) How are differences in the pattern of mantle Bouguer anomalies at the Mid-Atlantic Ridge related to inter-segment morphotectonic variability? (4) What is the relative abundance of conventional transform faults and non-transform discontinuities along the Mid-Atlantic Ridge? (5) What controls the formation, stability, and evolution of non-transform offsets on the Mid-Atlantic Ridge? The principal investigators will participate in two cruises of the French ship R/V l'Atalante.