Sedimentary facies and mineral provenance of Upper Triassic sandstones offshore Kvitøya, Svalbard: implications for palaeogeographic interpretations in the northern Barents Shelf area

IF 1.9 4区 地球科学 Q3 ECOLOGY Polar Research Pub Date : 2024-04-16 DOI:10.33265/polar.v43.9715
Mai Britt E. Mørk, Atle Mørk, Sondre K. Johansen, Kristian Drivenes, Bjørn A. Lundschien
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Abstract

Upper Triassic (Carnian) sandstones of the De Geerdalen Formation cored south of the island of Kvitøya (80°N), north-easternmost Svalbard, are described in terms of sedimentary facies and petrography and compared regionally in the northern Barents Shelf. The succession off Kvitøya is characterized by its great thickness and is dominated by deltaic deposits with high sand content of lithic–feldspathic compositions. Comparison of sediment facies and sandstone compositions with adjacent areas suggest that the succession off Kvitøya is part of a larger delta system with its main sediment source from the east. The delta sedimentation was terminated by marine transgression in the earliest Norian. The sandstone compositions off Kvitøya differ from nearby locations by the higher content of cherty rock fragments and reworked volcanic debris in the Kvitøya sandstone, which is most distinct in the lower part of the succession. Provenance signatures are investigated by mineral–chemical analysis of detrital feldspars, rock fragments, garnet and Cr-spinel, characterizing a wide variety of igneous, metamorphic and sedimentary terranes, including palaeo-Urals and areas farther to east. Additional, more proximal sediment source areas may also have existed that could explain the increased sediment thickness and the mineralogical immature sandstone compositions of the Carnian sediments off Kvitøya.

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斯瓦尔巴特岛克维托亚近海上三叠统砂岩的沉积面貌和矿物来源:对巴伦支海陆架北部地区古地理解释的影响
在斯瓦尔巴群岛最东北部的克维特岛(北纬 80°)以南钻取的 De Geerdalen 地层上三叠世(卡尼安纪)砂岩,从沉积相和岩相学的角度进行了描述,并与巴伦支海大陆架北部地区进行了比较。克维托亚附近海域的沉积厚度很大,主要是含沙量较高的石质-长石质三角洲沉积。与邻近地区的沉积面和砂岩成分比较表明,克维特岛附近的演替是一个较大三角洲系统的一部分,其主要沉积源来自东部。三角洲沉积在北纪初因海洋断陷而终止。克维特岛附近海域的砂岩成分与附近海域不同,克维特岛砂岩中含有较多的樱桃核岩石碎片和再加工火山碎屑,这在岩层下部最为明显。通过对碎裂长石、岩石碎片、石榴石和钙榍石的矿物化学分析,研究了各种火成岩、变质岩和沉积岩的产地特征,包括古乌拉尔山和更东边的地区。可能还存在其他更近的沉积物源区,这也可以解释为什么克维托亚附近的卡尼安沉积物厚度增加,矿物成分不成熟。
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来源期刊
Polar Research
Polar Research 地学-地球科学综合
CiteScore
3.20
自引率
5.30%
发文量
22
审稿时长
>12 weeks
期刊介绍: Since 1982, Polar Research has been the international, peer-reviewed journal of the Norwegian Polar Institute, Norway''s central institution for research, environmental monitoring and mapping of the polar regions. Aiming to promote the exchange of scientific knowledge about the Arctic and Antarctic across disciplinary boundaries, Polar Research serves an international community of researchers and managers. As an open-access journal, Polar Research makes its contents freely available to the general public. Original primary research papers comprise the mainstay of Polar Research. Review articles, brief research notes, letters to the editor and book reviews are also included. Special issues are published from time to time. The scope of Polar Research encompasses research in all scientific disciplines relevant to the polar regions. These include, but are not limited to, the subfields of biology, ecology, geology, oceanography, glaciology and atmospheric science. Submissions from the social sciences and those focusing on polar management and policy issues are welcome. Contributions about Antarctica are particularly encouraged.
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