格陵兰东北部沃拉斯顿福兰岛东部的上侏罗世-下白垩世:演变裂谷的远端海洋记录

IF 2 4区 地球科学 Q1 GEOLOGY
J. Hovikoski, J. Ineson, M. Olivarius, J. Bojesen‐Koefoed, S. Piasecki, P. Alsen
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引用次数: 0

摘要

在格陵兰东北部的沃拉斯顿福尔兰(Wollaston Forland),两个钻探岩芯覆盖了上侏罗统-下白垩统演替,为了解不断演化的远断层区块的泥岩堆积情况提供了独特的视角。 之前的研究显示,在氧气受限的早期裂谷和裂谷高潮阶段(伯恩比约格地层和林德曼斯布格特地层),存在着长期的黑色泥岩堆积。在此,我们重新审视了这些岩心所记录的沉积演化过程,详细描述了延伸至晚期同步断裂环境(Palnatokes Bjerg地层和Stratumbjerg地层)的沉积演替。研究结果表明,金梅里晚期-下伏尔加早期裂谷阶段的特点是在受构造影响的原生代近海环境中进行悬浮沉降、层状规模的事件沉积。与事件相关的沉积过程表现为饥饿的波痕、冲刷填充结构、推定的泥絮波纹以及泥浆为主的重力流沉积。在伏尔加河中游-梁赞断裂高潮阶段,沉积环境演变成一个狭窄的半堑壕,从粗沉积物推动的三角洲海岸线两侧的近端沉积中心分离出来。分离的半海湾中的相关沉积面为生物碎屑岩和富含黄铁矿的黑色泥岩,记录了次风暴潮基底斜坡和盆地底部环境中的悬浮沉降和重力流/泥石流沉积。黑色页岩沉积在梁赞晚期戛然而止,当时开始堆积凝结的生物扰动深海泥灰岩,这与更广泛的海洋学重组有关,同时西部的裂谷活动也在减弱。具有共同重力流成分的红色生物碎屑泥岩的沉积是豪特里维纪的特征,可能代表了水下断块峰顶的最终垂悬。在有芯演替的顶部,出现了巴里米亚时代的深灰色生物扰动泥岩,反映了热沉降盆地开始出现区域性连续深海泥堆积。 虽然表面上看很单调,但以泥岩为主的演替揭示了一个高度动态的沉积系统,反映了几乎整个断裂周期中不断变化的海洋过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Upper Jurassic – Lower Cretaceous of eastern Wollaston Forland, North-East Greenland: a distal marine record of an evolving rift
Two drill cores covering the Upper Jurassic – Lower Cretaceous succession in Wollaston Forland, NE Greenland, offer an exceptional insight into mud-accumulation in an evolving distal fault block.  Previous studies have revealed the presence of long-lasting black mudstone accumulation extending through the oxygen-restricted early rift and rift climax phases (Bernbjerg and Lindemans Bugt Formations). Here, we revisit the depositional evolution recorded in these cores to present a detailed description of the sedimentary succession extending into the late syn-rift settings (Palnatokes Bjerg and Stratumbjerg Formations). The results indicate that the Kimmeridgian – lower Volgian early rift-phase was characterized by suspension settling, laminae-scale event deposition in a tectonically-affected, prodeltaic offshore setting. The event-related depositional processes are expressed by starved wave-ripples, scour-and-fill structures, putative mud floccule ripples, and mud-dominated gravity-flow deposits. During the middle Volgian – Ryazanian rift climax phase, the depositional environment evolved into a narrow half-graben that was detached from the proximal depocentre flanking the coarse sediment fueled deltaic coastline. The correlative sedimentary facies in the detached half-graben are bioclastic and pyrite-rich black mudstones documenting suspension settling and gravity flow/mass wasting deposition in sub-storm wave-base slope and basin-floor environments. Black shale sedimentation ended abruptly in the late Ryazanian when the accumulation of condensed, bioturbated deep sea marls was initiated linked to broader oceanographic reorganization concomitant with waning rift activity in the west. Deposition of red bioclastic mudstones with a common gravity-flow component characterized the Hauterivian, potentially representing final draping of the submerged fault block crest. The top of the cored succession is demarcated by the appearance of dark grey bioturbated mudstones of Barremian age, reflecting the onset of regionally continuous deep-sea mud accumulation in thermally subsidizing basins.  Although superficially monotonous, the mudstone-dominated succession reveals a highly dynamic depositional system that reflects shifting marine processes during almost a full rift cycle.
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来源期刊
Geus Bulletin
Geus Bulletin GEOLOGY-
CiteScore
2.80
自引率
17.60%
发文量
8
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