摩尔多瓦-波迪利亚盆地(波罗的海西南部)晚埃迪卡拉纪沉积演替基底部分的锆石碎片的铀-铅地质年代学和铪同位素系统学:冰川起源与冲积起源的关系

IF 3.2 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Ion Francovschi , Leonid Shumlyanskyy , Volodymyr Grytsenko , Adam Hoffmann , Simon A. Wilde , Andrey Bekker
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引用次数: 0

摘要

新近纪的特征是两次持续时间较长的全球性雪球地球冰川--斯图尔特冰川(约 715-660 Ma)和马里诺冰川(约 639-635 Ma),以及持续时间较短、可能是区域性的加斯基尔冰川(约 580-579 Ma)。580-579 Ma。随后的埃迪卡拉纪和寒武纪早期一般被解释为气候温暖,没有低纬度海平面冰川作用。然而,世界各地的一些局部沉积单元,有时是区域性沉积单元,被解释为记录了这一时期的海平面冰川。其中一些沉积单元的褶皱不明显,受到变形和变质作用的影响,缺乏明确的沉积纹理和结构,而且年代不详。因此,它们的沉积特征和年龄限制往往不足以确定它们是否起源于冰川,也不足以确定它们的年龄是否符合寒冷气候指标所标示的明确时间区间。碎屑锆石地质年代学可能有助于区分表明冰川作用的异质和广泛产地,以及冲积环境中更典型的同质和局部产地。在本文中,我们利用波罗的海摩尔多瓦-波迪利亚盆地最下层晚埃迪卡拉纪沉积演替中的锆英石年龄分布模式趋势来确定沃伦组沉积物的产地。在这里,赫鲁什卡地层中二长岩的起源一直是一个争论不休的话题,主要集中在冰川起源还是冲积起源。采用 U-Pb 锆石 LA-ICP-MS 技术,对来自赫鲁什卡地层 Bakhtyn 床的两个砂岩样本和一个砾岩样本,以及来自上覆莫希利夫地层 Lomoziv 床的两个砂岩样本的锆石碎片进行了年代测定。将它们的年龄模式与已公布的上覆 Cosăuți (Yampil) 和 Bernashivka 岩石层的数据以及紧随其后的古生代花岗岩的新日期进行了比较,以检验所提出的巴赫金岩石层的冰川起源。根据钻孔岩芯数据推断出的沃伦群沉积物的区域分布情况被用来制约沉积盆地的演变。碎屑锆石结果表明,摩尔多瓦-波迪利亚沉积盆地中的陆相沉积物质是在巴赫京至科萨乌ți岩床沉积过程中来自前寒武纪基底的。这与冲积起源而非冰川起源是一致的。我们推断,锆英石地质年代地质学为测试冰川起源提供了一个尚未开发的潜力,因为这些单元的遗传特征和年代都很差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
U–Pb geochronology and Hf isotope systematics of detrital zircon from the basal part of the late Ediacaran sedimentary succession of the Moldova-Podillya basin (SW Baltica): Implications for glacial vs. alluvial origin

The Neoproterozoic is marked by two long-lasting global Snowball Earth glaciations—the Sturtian (ca. 715–660 Ma) and the Marinoan (ca. 639–635 Ma)—as well as the shorter-lived, potentially regional Gaskiers glaciation at ca. 580–579 Ma. The subsequent Ediacaran and early Cambrian periods are generally interpreted to be characterized by a warm climate without low-latitude, sea-level glaciations. However, a number of locally, and, sometimes regionally developed sedimentary units worldwide have been interpreted to record sea-level glaciations during this time interval. Some of these units crop-out poorly, were affected by deformation and metamorphism, lack definitive sedimentologic textures and structures, and are poorly dated. Their sedimentological characteristics, as well as age constraints, are thus often insufficient to determine whether they have a glacial origin and if their ages fit into well-defined time intervals marked by cold climate indicators. Detrital zircon geochronology may help distinguish between the heterogeneous and extensive provenances that are indicative of glaciation, and more homogenous, and local provenances that are more typical of alluvial settings. In this paper, we use trends in detrital zircon age distribution patterns from the lowermost late Ediacaran sedimentary succession of the Moldova-Podillya basin in Baltica to constrain the provenance of the Volyn Group sediments. Here, the origin of diamictites within the Hrushka Formation has long been a topic of debate, centered on either a glacial or alluvial origin. Detrital zircons from two sandstone samples and one conglomerate sample from the Bakhtyn Beds of the Hrushka Formation, and two sandstone samples from the Lomoziv Beds of the unconformably overlying Mohyliv Formation were dated using U-Pb zircon LA-ICP-MS techniques. Their age patterns are compared with published data for the overlying Cosăuți (Yampil) and Bernashivka beds as well as new dates for the immediately underlying Paleoproterozoic granites to test for a proposed glacial origin for the Bakhtyn Beds. The areal distribution of the Volyn Group sediments, inferred from drill-core data, is used to constrain the evolution of the sedimentary basin. The detrital zircon results indicate that terrigenous material in the Moldova-Podillya sedimentary basin was sourced from the Precambrian basement during deposition of the Bakhtyn to Cosăuți beds. This is consistent with an alluvial rather than a glacial origin. We infer that detrital zircon geochronology provides a largely untapped potential for testing a glacial origin for units that are otherwise poorly genetically characterized and dated.

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来源期刊
Precambrian Research
Precambrian Research 地学-地球科学综合
CiteScore
7.20
自引率
28.90%
发文量
325
审稿时长
12 months
期刊介绍: Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.
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