1前言深海扇是陆相沉积物的主要沉积场所。世界最大的冲积扇之一是雅玛逊冲积扇，它在中新世早期由于安第斯山抬升而开始发育。雅玛逊冲积扇结构受陆源沉积物沉积的控制。在全新世和古间冰期内，地表水的循环和大陆架的扩张限制了雅玛逊河，因此，陆源沉积物主要在大陆架内沉积 1 Introduction Deep-sea fans are the main deposits of continental sediments. One of the largest alluvial fans in the world is the Altama alluvial fan, which began to develop in the early Miocene due to the uplifting of the Andes. The Altama alluvial fan structure is controlled by the deposition of terrigenous sediments. During the Holocene and paleoclimatic period, the circulation of the surface water and the expansion of the continental shelf restricted the Armasen River, so that the terrigenous sediments were mainly deposited in the continental shelf