Late syn‐rift to early post‐rift basin fill dynamics of a mixed siliciclastic‐carbonate succession banked to a basement high, Hornsund, southwestern Spitsbergen, Arctic Norway,Basin Research

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Late syn‐rift to early post‐rift basin fill dynamics of a mixed siliciclastic‐carbonate succession banked to a basement high, Hornsund, southwestern Spitsbergen, Arctic Norway
Basin Research ( IF 2.8 ) Pub Date : 2024-07-02 , DOI: 10.1111/bre.12880
Anders Dahlin _{1,

2} , Kasper H. Blinkenberg ₃ , Alvar Braathen ₂ , Snorre Olaussen ₁ , Kim Senger ₁ , Aleksandra Smyrak‐Sikora ₁ , Lars Stemmerik _{1,

3}

Affiliation

The transition from syn‐rift to post‐rift sedimentation in rift basins is difficult to characterize in terms of stratigraphic architecture and dominating control on sedimentation, due to decreasing tectonic activity interplaying with regional subsidence, eustatic sea level changes, and differential compaction of underlying syn‐rift sediments. Our case study of the Late Palaeozoic Inner Hornsund Fault Zone targets late syn‐rift strata recorded in the (?Pennsylvanian – ?lower Permian) Treskelodden Formation in Hornsund, southern Spitsbergen, representing a mixed siliciclastic‐carbonate succession, with siliciclastics primarily sourced from the adjacent Sørkapp‐Hornsund High. We document local scale (<10 km) facies variability, sequence stratigraphy, and evolution of a succession deposited along a flank of the structural high during the late syn‐rift stage. We observe that during the transition towards rift termination (glacio‐)eustatic sea level changes and overall regional flooding became a more prominent forcing factor controlling sedimentation. Our dataset includes sedimentary logs, microfacies analysis, and high‐resolution digital outcrop models. We identify four progressively backstepping stratigraphic sequences, reflecting an evolution from (1) terrestrial siliciclastics through (2–3) nearshore mixed siliciclastic–carbonates, to (4) carbonate ramp deposits. On the small scale (<5 m) the internal sediment cyclicity of the succession was formed by autogenic processes, particularly the changing rate of sediment input from the southwestern source area (the uplifted Sørkapp‐Hornsund basement high). On the larger scale (10s of m), the importance of glacio‐eustatic sea‐level changes, driven by waxing and waning of ice caps in the southern hemisphere (Gondwana), increased as the rift‐related tectonics decreased. The interdisciplinary methods used in this study provide new knowledge of the Middle Pennsylvanian to Permian depositional evolution in southern Spitsbergen, besides a novel framework for comparison to adjacent basins in the region and similar basins elsewhere.

中文翻译：

挪威北极斯匹次卑尔根岛西南部霍恩松德沉积在基底高处的混合硅质碎屑-碳酸盐岩序列的同裂谷晚期到裂谷后早期盆地充填动态

由于构造活动减少与区域沉降、海平面变化和下伏同裂谷的差异压实相互作用，裂谷盆地从同裂谷到裂谷后沉积的转变很难用地层结构和对沉积的主导控制来表征。 ‐裂谷沉积物。我们对晚古生代内霍恩松断层带的案例研究目标是记录在斯匹次卑尔根岛南部霍恩松（？宾夕法尼亚期 - 下二叠纪）Treskelodden 组中的晚期同裂谷地层，代表混合硅质碎屑-碳酸盐岩序列，其中硅质碎屑主要来源于毗邻 Sørkapp-Hornsund 高中。我们记录了同裂谷晚期沿构造高侧翼沉积的局部尺度（<10 km）相变化、层序地层学和演化。我们观察到，在向裂谷终止过渡期间，（冰川）海平面变化和整体区域洪水成为控制沉积的更重要的强迫因素。我们的数据集包括沉积日志、微相分析和高分辨率数字露头模型。我们确定了四个逐渐后退的地层序列，反映了从（1）陆地硅质碎屑岩到（2-3）近岸混合硅质碎屑-碳酸盐岩，再到（4）碳酸盐斜坡沉积物的演化。在小尺度（<5 m）上，层序的内部沉积物循环是由自生过程形成的，特别是来自西南源区（隆起的 Sørkapp-Hornsund 基底高位）的沉积物输入的变化率。在更大的尺度（10米）上，由南半球（冈瓦纳）冰盖增减驱动的冰川海平面变化的重要性随着裂谷相关构造的减少而增加。这项研究中使用的跨学科方法提供了斯匹次卑尔根岛南部中宾夕法尼亚纪到二叠纪沉积演化的新知识，此外还提供了一个新的框架来与该地区邻近盆地和其他地方的类似盆地进行比较。

更新日期：2024-07-02

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