Table 1: Station data for the entire survey, including coordinates and description of BPBASE

During GANOVEX VI new gravity data were collected along an east-west profile in North Victoria Land south of the Drygalski Ice Tongue, extending 150 km across the Transantarctic Mountains, and comprising 21 data points. Thirty five additional data points were collected over a small area near Brimstone Peak, near the western end of the regional profile. The survey south of the Drygalski has been connected to northern gravity data (GANOVEX V) by a survey line of 12 points. All data have been terrain corrected, and are further constrained by satellite elevation (GPS) and radar ice-thickness measurements. A pronounced regional Bouguer gravity gradient decreasing to the west by approximately 3 mgal/km is superimposed over a coast-parallel belt of granitoid basement rock. West of this belt the local gravity fields become mote variable. Over Beta Peak (Ferrar dolerite) a 50 mgal spike is obser- ved. Within this area, the Ferrar sills are exposed at the surface. West of Brimstone Peak (Ferrar/Kirk patrick sequences), a smooth regional gradient appears to reassert itself. We interpret the initial gradient east (oceanward) of the break-in-slope to be representative of the crust/mantle boundary within the study area. We interpret the initial break-in-slope and the apparent flattening of the regional gradient to be an effect of the N-S trending zone of dense Ferrar sills and associated deep crusttil fractionate replacing less dense basement. We attribute the variability of the local field to be the product of sub-glacial density contrasts that cannot be removed. The regional gravity gradient of the profile is steeper than that observed to the north (Mt. Melbourne quadrangle) and shallower than that reported to the south (McMurdo Sound). The absolute values of the coastal points of origin south of the Drygalski and within the Mt. Melbourne quadrangle differ by 60 to 100 mgal. In addition, topographic relief within the regional transect area is subdued relative to the Transantarctic Mountains to the north and south. We speculate that the root structure of the Transantarctic Mountains undergoes a change somewhere between the Mt. Melbourne quadrangle and the region south of the Drygalski Ice Tongue.在GANOVEX VI项目期间，科研人员于德里加尔斯基冰舌（Drygalski Ice Tongue）以南的北维多利亚地（North Victoria Land）沿东西向剖面采集了全新的重力数据。该剖面横穿横贯南极山脉（Transantarctic Mountains），全长150公里，共计包含21个数据测点。另有35个额外测点采集于布里斯通峰（Brimstone Peak）附近的小范围区域，该区域临近区域剖面的西端。 通过一条包含12个测点的测线，德里加尔斯基冰舌以南的重力测量数据已与北部的GANOVEX V重力数据实现衔接。所有重力数据均已完成地形校正，并辅以卫星高程（GPS）与雷达冰厚测量数据进行约束。 研究区存在一条显著的区域布格重力梯度（Bouguer gravity gradient），其以约3毫伽每公里的速率向西递减，且该梯度叠加于一条与海岸平行的花岗岩基底岩带之上。该岩带以西的局部重力场变得更为复杂多变。在贝塔峰（Beta Peak，赋存费拉尔辉绿岩（Ferrar dolerite））上方，观测到一个幅值达50毫伽的重力峰值。该区域内，费拉尔岩床（Ferrar sills）直接出露于地表。 在布里斯通峰以西（对应费拉尔/柯克帕特里克序列（Ferrar/Kirkpatrick sequences）），平滑的区域重力梯度似乎再次显现。 我们将斜坡断裂带以东（朝向大洋一侧）的初始重力梯度，解读为研究区内壳幔边界的表征。我们认为，初始斜坡断裂带与区域梯度的明显平缓，是南北走向的高密度费拉尔岩床带及相关深部地壳分异作用替代低密度基底所带来的效应。我们将局部重力场的变化归因于无法被移除的冰下密度差异。 本剖面的区域重力梯度相较于北部的墨尔本山幅区（Mt. Melbourne quadrangle）观测结果更为陡峭，却又比南部的麦克默多湾（McMurdo Sound）报道的梯度更为平缓。德里加尔斯基冰舌以南与墨尔本山幅区内的沿海起始测点，其绝对重力值相差60至100毫伽。此外，相较于南北两侧的横贯南极山脉，本区域样带内的地形起伏更为和缓。我们推测，横贯南极山脉的地壳根带结构，在墨尔本山幅区与德里加尔斯基冰舌以南区域之间的某处发生了变化。