A Seismic Refraction Investigation of Crustal Thickness Variations Between the Australian-Antarctic Discordance and Neighboring Southeast Indian Ridge

9314315菲普斯澳大利亚南极不协调带是大洋中脊的一部分，比预期的要深得多。该项目将收集两个相邻区段的地壳厚度测量数据，该区段具有中值谷，轴向深度比相邻的东南印度脊段深1公里，其东部具有轴向高形态。需要解决的问题是：(1)洋中脊深度、地壳厚度和主要元素化学的Klein & Langmuir对比是否适用于洋中脊，(3)邻近的东南印度脊的地壳厚度与洋中脊的地壳厚度不同，以及(4)东南印度脊下是否存在岩浆透镜体。＊＊＊

9314315 Phipps The Australian Antarctic Discordance is a section of mid ocean ridge that is significantly deeper than expected. This project will collect crustal thickness measurements from two neighboring segment in the Discordance has a median valley and a 1 km deeper axial depth than its neighboring Southeast Indian Ridge segment to the east that has an axial high morphology. Questions to be addressed are whether: (1) the Discordance is underlain by thin crust, (2) the Klein & Langmuir correlation of mid ocean ridge depth, crustal thickness, and major element chemistry is valid for the Discordance, (3) the crustal thickness on the adjacent Southeast Indian ridge differs from that in the Discordance, and (4) a magma lens exists under the Southeast Indian Ridge. ***