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

维多利亚州北部伦尼克地堑和坎贝尔地块的重力研究，以及伦尼克结构与罗斯海裂谷过程的关系

基本信息

批准号：
8720654
负责人：
Juergen Kienle
金额：
$ 12.98万
依托单位：
University of Alaska Fairbanks Campus
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1988
资助国家：
美国
起止时间：
1988-07-01 至 1990-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8720654&HistoricalAwards=false
关键词：
Gravity Study Rennick Graben Campbell

项目摘要

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.

北维多利亚地提供横贯南极山脉最宽的横截面，横贯南极山脉是分隔东西南极洲的主要山脉，似乎是由伸展和裂肩隆起而不是挤压产生的。位于维多利亚州北部的一个重要地堑结构——伦尼克地堑（Rennick Graben）可能是罗斯海恐怖裂谷的延伸。这个重要区域实际上不存在陆基地球物理数据。这项调查将获取并解释伦尼克地堑结构和坎贝尔地块的重力数据，坎贝尔地块是一块显然未破碎的大陆地壳，将伦尼克结构与恐怖裂谷分开。这项工作的目标是从重力角度定义伦尼克结构，追踪该结构向南穿过坎贝尔地块到达恐怖裂谷，并研究伦尼克结构的均衡补偿机制。这将是与德意志联邦共和国 Bundesanstalt Fur Geowissenschaften 的一个合作项目，该项目将为 1988/1989 年野外季节德国南极北维多利亚陆地探险 (GANOVEX V) 期间的这项工作提供后勤服务。首席研究员已受邀作为 GANOVEX V 的受邀美国参与者领导重力研究。重力数据将与 GANOVEX V 探险的其他地质、结构、磁力和地震折射研究相结合，以解决更大的横贯南极山脉问题以及地幔异常的性质可能是横贯南极裂谷系统的根本原因。