Gravity Study of the Rennick Graben and the Campbell Block in Northern Victoria Land, and the Relation of the Rennick Structure to Rifting Processes in the Ross Sea

北维多利亚地提供了横贯南极山脉最宽的横截面，横贯南极山脉是分隔南极洲东部和西部的主要山脉，似乎是由伸展和裂谷肩隆起而不是压缩产生的。一个重要的地堑结构，伦尼克地堑，在北维多利亚地堑可能是罗斯海恐怖裂谷的延伸。这个重要地区几乎没有陆地地球物理数据。这次调查将获取并解释伦尼克地堑构造和坎贝尔地块的重力数据，坎贝尔地块是一块将伦尼克构造与恐怖裂谷分开的大陆地壳，显然是完整的。本研究的目的是对Rennick构造进行重力定义，向南沿Campbell地块向Terror裂谷方向追踪Rennick构造，研究Rennick构造的均衡补偿机制。这将是与德意志联邦共和国联邦地理研究所的一个合作项目，它将在1988/1989年野外季节德国南极北维多利亚陆地考察（GANOVEX V）期间为这项工作提供后勤。首席研究员已被邀请作为GANOVEX v的受邀美国参与者领导重力研究。重力数据将与其他地质、构造、从更大的横贯南极山脉问题和地幔异常的性质（可能是横贯南极裂谷系统的潜在原因）的角度对GANOVEX V考察队的磁和地震折射进行了研究。

Northern Victoria Land offers the widest cross section of the Transantarctic Mountains, a major mountain range that separates East and West Antarctica and appears to be produced by extension and rift shoulder uplift rather than by compression. An important graben structure, the Rennick Graben, in Northern Victoria land may be an extension of the Terror Rift in the Ross Sea. Virtually no land-based geophysical data exist for this important region. This investigation will acquire and interpret gravity data over the Rennick Graben structure and the Campbell Block, an apparently unbroken piece of continental crust that separates the Rennick structure from the Terror Rift. The goals of this work are to define the Rennick structure gravimetrically, to trace the structure southward across the Campbell Block toward the Terror Rift, and to study the isostatic compensation mechanism for the Rennick structure. This will be a cooperative project with the Bundesanstalt fur Geowissenschaften, Federal Republic of Germany, which will provide the logistics for this work during the German Antarctic Northern Victoria Land Expedition (GANOVEX V) in the 1988/1989 field season. The Principal Investigator has been invited to lead the gravity study as an invited U.S. participant of GANOVEX V. The gravity data would be integrated with other geological, structural, magnetic and seismic refraction studies of the GANOVEX V expedition in terms of the larger Transantarctic Mountain problem and the nature of the mantle anomaly that might be the underlying cause of the Transantarctic Rift System.