Seismic Investigation of Sediment Stratigraphy Beneath the East Antarctic Ice Cap

9220462 THOMPSON该奖项支持美国-新西兰联合地震调查的美国部分，该调查对南极东部冰盖下从横贯南极山脉到威尔克斯冰下盆地的沉积地层进行了调查。 科学目标是：1）通过对横贯南极山脉西侧的地层结构进行成像，来测试横贯南极山脉的隆起模型，并为之提供约束条件，2）通过确定东南极冰盖下该单元的地理范围来约束费拉尔岩浆起源的模型，以便岩浆活动模型，包括地幔柱活动与响应区域裂谷的熔融，可以进行评估，以及3）通过确定威尔克斯盆地是否含有可能是天狼星组物质来源的海洋沉积物，帮助解决有关新生代晚期东南极冰盖气候条件和大小的争论，天狼星组是一个含有上新世的冰碛。位于跨南极山脉许多高海拔地区的硅藻。 ***

9220462 THOMPSON This award supports the U.S. portion of a joint U.S. - New Zealand seismic investigation of the sediment stratigraphy beneath the East Antarctic Ice Sheet from the Transantarctic Mountains into the Wilkes Subglacial Basin. The scientific objectives are: 1) to test, and provide constraints for, uplift models of the Transantarctic Mountains by imaging the stratigraphic structure of the west side of the Transantarctic Mountains, 2) to constrain models of the origin of Ferrar magmas by determining the geographic extent of this unit under the East Antarctic Ice Sheet so that models of magmatism, involving mantle plume activity versus melting in response to regional rifting, can be evaluated, and 3) to help resolve the debate about the climatic conditions and size of the East Antarctic Ice Sheet in the late Cenozoic by determining if the Wilkes Basin contains marine sediments that could have been a source of material for the Sirius Formation, a till containing Pliocene diatoms which is located at many high altitude locations in the Transantarctic Mountains. ***