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

维多利亚州北部是横跨南极山脉最宽的地方，这是南极洲东部和西部之间的一条主要山脉，似乎是由伸展和裂谷肩部抬升而不是挤压产生的。维多利亚州北部的一个重要的地堡构造--伦尼克地堡，可能是罗斯海恐怖裂谷的延伸。这一重要区域几乎没有陆上地球物理数据。这项调查将获取并解释伦尼克格拉本构造和坎贝尔地块的重力数据，坎贝尔地块是将伦尼克构造与恐怖裂谷分开的一块明显完整的大陆地壳。这项工作的目的是对Rennick构造进行重力定义，追踪该构造向南穿过Campbell地块走向恐怖裂谷，并研究Rennick构造的均衡补偿机制。这将是一个与德意志联邦共和国联邦联邦政府的合作项目，它将在1988/1989年度德国南极北维多利亚陆地考察队(GANOVEX V)实地考察期间为这项工作提供后勤。首席调查员受邀作为GANOVEX V号探险队的美国特邀参与者领导重力研究。重力数据将与GANOVEX V号探险队的其他地质、构造、磁力和地震折射研究相结合，以解决更大的横贯北极山脉问题，以及可能是横贯北极裂谷系统的根本原因的地幔异常的性质。

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.