Abstract

The Aptian deposits on Spitsbergen Island are poorly studied. Moreover, there were no published data on fossil distribution in the Aptian and Albian in the vicinity of the town of Longyearbyen. This article provides new data on ammonite-based biostratigraphy of the Carolinefjellet Formation, indicating the presence of Beds with Tropaeum arcticum (middle Aptian) and Beds with Grantziceras (lower Albian). The age of the formation was verified and the presence of lower Albian strata was justified. The results of microscopic and isotope studies of five samples of glendonites collected from the middle Aptian of the Carolinefjellet Formation section are presented. Glendonites from the Carolinefjellet Formation are composed of three calcite phases: ikaite-derived calcite and two successive types of cement, which fill cavities and develop partially after the first-phase calcite. The O and C isotope compositions of glendonites were measured in five bulk samples from the middle Aptian interval of the section. The δ¹⁸O isotope composition of glendonites is significantly different from that of seawater, indicating the input of diagenetic fluids; the δ¹³C values are characteristic of sedimentary organic matter and methanotrophy. For the first time, findings of ammonites allowed us to clarify the stratigraphic intervals of glendonite occurrence and associated cold-climate episodes and prove the early Albian age of glendonites from the top of the Carolinefjellet Formation.

中文翻译：

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斯匹次卑尔根西部卡罗莱涅夫勒特地层（中阿皮安-下阿尔比，白垩纪）的钙蒙脱石地层学和分布的新数据

摘要

Spitsbergen岛上的Aptian矿床研究得很少。此外，在朗伊尔城附近的阿普提安和阿尔比安没有有关化石分布的公开数据。本文提供了有关Carolinefjellet组基于铵铁矿的生物地层学的新数据，表明存在着Tropaeum arcticum的床（中部阿普提安）和Grantziceras的床（下部Albian）的存在。验证了地层的年龄，并证实了较低的Albian地层的存在。给出了从卡罗莱纳夫耶勒特段中部阿普提安采集的5个轻铝石样品的显微和同位素研究结果。Carolinefjellet地层的Glendonites由三个方解石相组成：源自ikaite的方解石和两种连续的水泥类型，在第一相方解石之后，它们填充了空腔并部分地发展。从该断面的中部Aptian间隔中的五个散装样品中测量了轻铝石的O和C同位素组成。δ皂石的¹⁸ O同位素组成与海水明显不同，表明成岩流体的输入。的δ ¹³ C值是沉积有机质和methanotrophy特性。首次发现，通过铵铁矿的发现，我们可以清楚地认识到皂石的地层间隔和相关的寒冷气候事件，并从卡罗莱涅夫特尔岩层顶部证明了皂石的早期阿尔比时代。