The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis
The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis
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DOI：
10.1016/j.precamres.2016.05.013
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发表时间：
2016-08-01
影响因子：
3.8
通讯作者：
Stevenson, Carl T. E.
中科院分区：
文献类型：
--
作者：
Fairchild, Ian J.;Bonnand, Pierre;Stevenson, Carl T. E.
晚寒武世暖期(LCWI)指的是一段非冰期的间隔期，该间隔期将被认为是斯特拉西期和马里诺期寒武纪的代表隔开。它的持续时间受到放射性测量的限制很差，它的沉积在大多数地理区域相对较少为人所知。本文旨在对斯瓦尔巴群岛东北斯匹茨卑尔根经典地区这类矿床的形成时间、古环境和岩石成因进行研究。层序由200-205m的白云质页岩(Elbobreen组的Macdonaldryggen段，简称E3)覆盖，上覆有15-25m厚的蛾粒白云岩Sangen段(E4)，E3的顶部和底部发育石灰岩。由负到正三角洲C-13的典型Sturtian盖层碳酸盐剖面和E3基灰岩的原生锶同位素组成证实了该演替的假定年龄背景
The Late Cryogenian Warm Interval (LCWI) refers to a non-glacial interval that separates presumed representatives of the Sturtian and Marinoan panglaciations. Its duration is poorly constrained radiometrically and its deposits are relatively poorly known in most geographic regions. This paper aims to constrain the duration, palaeoenvironments and petrogenesis of such deposits in the classic region of NE Spitsbergen, Svalbard. The succession comprises a 200-205 m dolomitic shale (Macdonaldryggen Member, known as E3, of the Elbobreen Formation) overlain by oolitic dolomite Slangen Member (E4), 15-25 m thick, with limestone developed at top and base of E3 in the south of the area. The assumed age context of the succession has been confirmed by the presence of a typical Sturtian cap carbonate profile of negative to positive delta C-13, and primary Sr isotope compositions of basal E3 limestones