Multi-proxy analyses of two sediment cores from Dicksonfjorden were performed to reconstruct Holocene environmental conditions in this northern branch of Isfjorden, the largest fjord system in Svalbard. Factors affecting the depositional processes include shifts in sources of sediments, ice rafting and regional glacio-isostatic rebound. Sediments were derived from Palaeozoic siliciclastics and carbonates occurring at the fjord head and sides, respectively. Their relative contributions were controlled by falling relative sea level and the resulting progradation of the major stream and delta systems closer to the core sites. Deposition of clasts from sea-ice rafting persisted throughout most of the Holocene. Following a period of low, but continuous, clast fluxes (ca. 11 000–7000 calibrated years before the present), ice rafting was most intensive between ca. 7000 and 3000 calibrated years before the present. It can be related to extensive seasonal sea-ice formation caused by regional cooling. The prograding deltas also provided coarse sediments. Reduced ice rafting from ca. 3000 calibrated years before the present suggests enhanced formation of shorefast and/or permanent sea ice, suppressing sea-ice rafting in the fjord, in response to the cool climate and reduced heat flux from Atlantic Water. Episodic inflow of Atlantic Water and low turbidity of surface water can, however, account for a larger amount of marine organic matter produced in the outer fjord. The sedimentary record in Dicksonfjorden, where tidewater glaciers are absent, reflects similar climate and oceanographic variations as reconstructed in fjords on western Spitsbergen that are influenced by tidewater glaciers.

中文翻译：

---

Dicksonfjorden、西斯匹次卑尔根、斯瓦尔巴的全新世环境变化

对来自 Dicksonfjorden 的两个沉积岩芯进行多代理分析，以重建 Isfjorden 北部分支（斯瓦尔巴群岛最大的峡湾系统）的全新世环境条件。影响沉积过程的因素包括沉积物来源的变化、冰筏漂流和区域冰川等静压回弹。沉积物分别来自出现在峡湾头部和侧面的古生代硅质碎屑岩和碳酸盐岩。它们的相对贡献受到相对海平面下降以及由此产生的靠近核心地点的主要河流和三角洲系统的进积控制。在整个全新世的大部分时间里，海冰漂流产生的碎屑沉积持续存在。经过一段时间的低但持续的碎屑通量（大约在现在之前校准的 11 000-7000 年），冰筏漂流在大约之间最为密集。现在之前的 7000 年和 3000 年校准。这可能与区域变冷引起的广泛的季节性海冰形成有关。进积的三角洲也提供了粗粒沉积物。从大约减少冰漂流。在现在之前 3000 年校准表明，海岸冰和/或永久性海冰的形成增强，抑制了峡湾中的海冰漂流，以应对凉爽的气候和来自大西洋水的热通量减少。然而，大西洋水的间歇性流入和地表水的低浊度可以解释外峡湾产生的大量海洋有机物质。Dicksonfjorden 的沉积记录，那里没有潮汐冰川，