格陵兰东北部沃拉斯顿福地上侏罗统-下白垩统演化半沟谷系统中的泥岩成因和砂岩成因

IF 2 4区 地球科学 Q1 GEOLOGY Geus Bulletin Pub Date : 2023-12-21 DOI:10.34194/geusb.v55.8309
M. Olivarius, A. Kazerouni, R. Weibel, T. Kokfelt, J. Hovikoski
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引用次数: 0

摘要

通过对 Brorson Halvø-1 和 Rødryggen-1 岩心的岩石学和矿物学分析,以及对附近砂岩的锆石 U-Pb 年龄测定分析,研究了断裂对格陵兰东北部沃拉斯顿福地北部金梅里德纪至巴雷姆纪泥岩成分的影响。泥岩成分随断裂时间和在半海湾沉积系统中的位置而发生系统性变化。黄铁矿主要沉淀于早期断裂至断裂高潮阶段。在裂谷高潮阶段(Lindemans Bugt Formation),黄铁矿才在框架岩上过度生长。白云石是主要的碳酸盐胶结物,但在断裂减弱期早期(Palnatokes Bjerg Formation)沉积的沉积物中方解石占主导地位,在断裂减弱期晚期(Stratumbjerg Formation)沉积的沉积物中菱铁矿占主导地位。伊利石、石英、绿泥石和重晶石沉淀的最高温度反应表明,在掘起之前,沉积物的埋藏深度大于 2 千米。抬升引起的断裂主要发生在早期裂谷至裂谷加速演替(伯恩比约格地层)中。半沟谷近端泥岩(Rødryggen-1)比远端泥岩(Brorson Halvø-1)含有更多的分离高岭石,后者含有更多的混合层伊利石-直闪石和伊利石。蛭石只沉积在断裂高潮期和断裂消退期的盆地近端。在断裂消退阶段,绿泥石在盆地近端和远端沉积,但远端沉积开始较早。因此,半沟谷远端细粒沉积物可能是由位于北部和西北部的古新生代晶质岩和中新生代至新新生代变质岩的轴向运移提供的。这与出露的富含砂层的锆石产地特征相吻合,在富含砂层中,U-Pb年龄为2.0-1.6 Ga的锆石颗粒占主导地位,此外还有常见的1.6-0.9 Ga年龄,以及较少的2.8-2.6 Ga和0.47-0.36 Ga年龄。
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Mudstone diagenesis and sandstone provenance in an Upper Jurassic – Lower Cretaceous evolving half-graben system, Wollaston Forland, North-East Greenland
The influence of rifting on the composition of Kimmeridgian to Barremian mudstones from northern Wollaston Forland, North-East Greenland is investigated by petrographic and mineralogical analyses of the Brorson Halvø-1 and Rødryg­gen-1 cores, and provenance of analysis by zircon U-Pb age dating of nearby sandstones. Mudstone composition varies systematically as a function of the timing of rifting progression and position in the half-graben depositional system. Pyrite primarily precipitated in the early rift to rift climax phases. Euhedral pyrite overgrowths on framboids formed only during the rift climax phase (Lindemans Bugt Formation). Dolomite is the dominant carbonate cement, except for the sediments deposited in the early waning rift phase (Palnatokes Bjerg Formation) where calcite is dominant, and in the late waning rift phase (Stratumbjerg Formation) where siderite dominates. The highest-temperature reactions with precipitation of illite, quartz, ankerite and barite signify sediment burial depths of >2 km prior to exhumation. Uplift-induced fracturing occurred mainly in the early rift to rift acceleration succession (Bernbjerg Formation). Mudstones in the proximal part of the half-graben (Rødryggen-1) include more detrital kaolinite than the distal mudstones (Brorson Halvø-1), which contain more mixed-layer illite-smectite and illite. Vermiculite was deposited only in the proximal part of the basin in the rift climax and waning rift successions. Chlorite was deposited proximally and distally during the waning rift phase, though supply began earlier in the distal part. Fine-grained sediment in the distal part of the half-graben was therefore probably supplied by axial transport from Palaeoproterozoic crystalline rocks and Meso- to Neoproterozoic metamorphic rocks located to the north and north-west. This agrees with the zircon provenance signature from outcropping sand-rich facies, where zircon grains with U-Pb ages of 2.0–1.6 Ga are dominant, in addition to common 1.6–0.9 Ga ages, and fewer 2.8–2.6 Ga and 0.47–0.36 Ga ages.
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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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