The St. Elias orogen and the Surveyor Fan in the adjacent Gulf of Alaska are a coupled source to sink system recording the interplay of tectonics and variable degrees of glaciation during the collision of the Yakutat terrane with the southern Alaska margin since the Miocene. The Miocene to Holocene sediments of the Surveyor Fan were drilled during IODP expedition 341. The recovered material is used to constrain information on changes in erosion centers during the last 10 Ma to study the impact of climatic and tectonic processes on orogen evolution. Point counting of sand- and silt-sized light framework components and geochemical single grain analysis of heavy mineral groups epidote and pyroxene is applied to analyze patterns of sedimentary provenance of two sites on the distal and proximal Surveyor Fan (Site U1417 and U1418, respectively). The studied sands and silts of Miocene to Pleistocene age are slightly enriched in feldspar (plag >> kf) at the proximal site, compositions at both sites do not show systematical changes with time of deposition. Framework component spectra uniformly reflect the expected active margin provenance. Epidote and pyroxene compositions are very consistent and show no change with time of deposition. Associations of epidote and pyroxene with albite, titanite and pumpellyite are in line with near-shore sources in the Chugach Metamorphic Complex and the metabasite belt at its southern border, and in units of recycled detritus exposed in the fold and thrust belt on the western Yakutat Terrane, respectively. Rock fragments indicate input from mainly metamorphic sources during the Miocene and Pliocene and an increase of input from low-grade metamorphic and sedimentary rocks in the Pleistocene, a finding also indicated by the abundance of epidote and pyroxene. This implies increasing erosion of the near-shore areas of the fold and thrust belt with advance of glaciers to the shore since the Miocene, being enhanced by the onset of the Northern Hemisphere glaciation at the beginning of the Pleistocene. Climate changes connected to the mid-Pleistocene transition did not result in appreciable changes in the petrographic compositions. Glaciers seem to have remained nested in their topographically predefined positions, continuously feeding material with uniform characteristics into the fan.

相邻的阿拉斯加湾的圣伊莱亚斯造山带和测量师风扇是耦合的下沉系统源，记录了中新世以来雅库塔特地层与阿拉斯加南部边缘发生碰撞时构造学的相互作用和不同程度的冰川作用。在IODP考察341期间，钻了测量员风扇的中新世至全新世沉积物。回收的材料用于限制最近10 Ma侵蚀中心变化的信息，以研究气候和构造过程对造山带演化的影响。使用沙粒和粉粒大小的轻构架组件进行点计数，并对重矿物基附睾和辉石进行地球化学单颗粒分析，以分析测量员扇形体远端和近端两个位置的沉积物产地模式（分别为站点U1417和U1418） 。所研究的中新世至更新世的砂和粉砂岩在近端部位略有长石（plag >> kf）富集，这两个部位的组成都没有显示出随沉积时间的系统变化。框架组件的光谱均匀地反映了预期的有效保证金来源。Epidote和辉石的组成非常一致，并且不会随沉积时间而变化。Epidote和辉石与钠长石，钛铁矿和绿硅钙石的结合与Chugach变质带及其南部边界的变位带的近岸来源以及在雅库塔特西部褶皱和逆冲带中暴露的再生碎屑单元一致Terrane，分别。岩石碎片表明在中新世和上新世期间主要来自变质源的输入，而在更新世中低品位的变质和沉积岩中的输入增加，这一发现还由大量的表观和辉石表明。这意味着自中新世以来，随着褶皱和逆冲带近岸地区的冰川向海岸推进，侵蚀逐渐加剧，这是由于更新世初期北半球冰川作用的开始而加剧的。与更新世中期过渡有关的气候变化并未导致岩石学组成发生明显变化。冰川似乎仍然嵌套在其预先设定的地形位置中，从而将具有均匀特性的材料不断地馈送到风扇中。附睾和辉石的丰度也表明了这一发现。这意味着自中新世以来，随着褶皱和逆冲带近岸地区的冰川向海岸推进，侵蚀程度不断增加，而在更新世初期，北半球开始形成冰川作用，加剧了褶皱和逆冲带的近岸侵蚀。与更新世中期过渡有关的气候变化并未导致岩石学组成发生明显变化。冰川似乎仍然嵌套在其预先设定的地形位置中，从而将具有均匀特性的材料不断地馈送到风扇中。附睾和辉石的丰度也表明了这一发现。这意味着自中新世以来，随着褶皱和逆冲带近岸地区的冰川向海岸推进，侵蚀程度不断增加，而在更新世初期，北半球开始形成冰川作用，加剧了褶皱和逆冲带的近岸侵蚀。与更新世中期过渡有关的气候变化并未导致岩石学组成发生明显变化。冰川似乎仍然嵌套在其预先设定的地形位置中，从而将具有均匀特性的材料不断地馈送到风扇中。在更新世初期，北半球开始发生冰川作用，从而增强了这种情况。与更新世中期过渡有关的气候变化并未导致岩石学组成发生明显变化。冰川似乎仍然嵌套在其预先设定的地形位置中，从而将具有均匀特性的材料不断地馈送到风扇中。在更新世初期，北半球开始发生冰川作用，从而增强了这种情况。与更新世中期过渡有关的气候变化并未导致岩石学组成发生明显变化。冰川似乎仍然嵌套在其预先设定的地形位置中，从而将具有均匀特性的材料不断地馈送到风扇中。