Petrology and Tectonics of the Australian-Antarctic Discordance and Adjacent Ridges

澳大利亚-南极不一致是一个独特的， 大洋中部神秘的水深和地质特征 山脊系统，其起源知之甚少。本奖项 将支持综合地球物理和地球化学项目， 研究不一致区结合全面的 用SeaMARC II侧扫声纳进行地球化学调查 调查和详细的磁力和重力分析将提供一个 独特的数据集，将集中在两个问题，这是 无论是在全球范围内还是在尊重方面，都具有根本意义 （1）地球物理学和 不整合面东边界的地球化学性质 这是地球化学和海洋测深学上 全球洋中脊系统的不连续性;（2） 轴深、轴形态、脊之间的相互关系 分段和沿着轴岩石学变化，所有这些 在不一致区内外都异常多变 这项研究是一个科学家合作项目， 马萨诸塞州拉蒙特-多尔蒂地质观测所 技术和夏威夷大学。实地工作将在 莫阿娜浪号上找到的

The Australian-Antarctic Discordance is a unique and enigmatic bathymetric and geologic feature of the mid-oceanic ridge system whose origin is poorly understood. The present award will support an integrated geophysical and geochemical project to study the Discordance zone. The combination of a comprehensive geochemical investigation with a SeaMARC II side-scan sonar survey and detailed magnetic and gravity analyses will provide a unique data set which will focus on two problems which are of fundamental significance, both on a global scale and with respect to the nature of the Discordance itself: (1) the geophysical and geochemical nature of the eastern boundary of the Discordance which is one of the most pronounced geochemical and bathymetric discontinuities in the global mid-ocean ridge system and (2) the interrelationships among axial depth, axial morphology, ridge segmentation, and along axis petrologic variations, all of which are unusually variable within and outside the Discordance. The study is a cooperative project between scientists at Lamont-Doherty Geological Observatory, Massachusetts Institute of Technology, and the University of Hawaii. Field work will be done from the R.V. Moana Wave.