U.S.-Argentina Cooperative Research on Conjugate Margins of Argentina and Antarctica

该奖项支持对地球物理学的合作研究， 阿根廷和南极边缘将由约翰 拉蒙特-多尔蒂地质观测站的拉布雷克 哥伦比亚大学和南极的玛尔塔吉代拉 研究所在布宜诺斯艾利斯，阿根廷。 这项工作将扩大 前侏罗系的共轭重建研究 南极威德尔盆地边缘和南部边缘 南美洲的一个地区。 程序将是比较磁性 以及南北两侧的重力异常 大西洋在非洲和南美洲的定义， 前裂谷大陆的重建 当前信息 表明威德尔和南美边缘 共轭裂谷边缘，但数据是缺乏威德尔 的方面想 这项研究将有助于提供这样的数据， 地震反射测量可以指示厚度 火山作用增厚的洋壳的堆积。 这些 将与高振幅磁异常相关。 这一结果将进一步阐明 冈瓦纳超大陆的分裂 在这项研究中，美方将受益于后勤 在阿根廷的支助、获得新的数据集和一般 地球物理科学的进步。 他们带来了先进的 科学计算和改进的仪器作为额外的 有利于合作。 其结果将是一个 扩大南大洋这一部分的数据库， 鼓励美国-阿根廷联合地球物理工作 在南极研究中。

This award supports cooperative research on the geophysics of Argentine and Antarctic margins to be conducted by John LaBrecque of the Lamont-Doherty Geological Observatory at Columbia University and Marta Ghidella of the Antarctic Institute in Buenos Aires, Argentina. This work will extend studies of the pre-Jurassic reconstructions of the conjugate margins of the Antarctic Weddell basin and the southern edge of South America. The procedure will be to compare magnetic and gravitational anomalies on both sides of the South Atlantic in Africa and South America to define the reconstruction of the prerift continent. Current information suggests that the Weddell and South American margins are conjugate rift margins but data is lacking for the Weddell side. This study will help provide such data through dipping seismic reflector measurements which can indicate thick accumulations of volcanically thickened oceanic crust. These will be correlated with high amplitude magnetic anomalies. The results will be shed further light on the theory of the breakup of the supercontinent Gondwana. In this study, the U.S. side will benefit from logistic support in Argentina, access to new data sets, and general advancement of geophysical science. They bring advanced scientific computing and improved instrumentation as additional benefits to the collaboration. The result will be an expanded data base for this sector of the southern oceans and encouragement for the U.S.-Argentine joint geophysical effort in Antarctic research.