Calpionellid biostratigraphy and microfacies across the Tithonian/Berriasian boundary interval in the Western Fore-Balkan, Bulgaria

Review of the Bulgarian Geological Society Pub Date : 2023-12-01 DOI:10.52215/rev.bgs.2023.84.3.193

S. Petrova, P. Andreeva, I. Lakova

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Abstract

The upper Tithonian and the lower Berriasian in the Western Fore-Balkan in Bulgaria (Gintsi and Glozhene Formations) represent a remarkable, stratigraphically expanded record of pelagic nodular and micritic limestones. More than 50 studied thin sections revealed the succession of the Chitinoidella, Praetintinnopsella, Crassicollaria, and Calpionella zones, further divided into subzones. The stratigraphical ranges of 22 chitinoidellid (the genera Almajella, Borziella, Carpathella, Chitinoidella, Daciella, Dobeniella, Longicollaria, and Praetintinnopsella) and 26 calpionellid species of the genera Tintinnopsella, Crassicollaria, Calpionella, Remaniella, Borzaiella and Lorenziella have been recorded. Eight microfacies, two of which in the Gintsi Formation, and six microfacies in the Glozhene Formation have been distinguished, all being wackestones and mudstones, characteristic of open-marine pelagic deposits and differing from each other in the prevailing bioclasts. The Tithonian/Berriasian boundary was tentatively drawn at the Crassicollaria/Calpionella boundary.

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保加利亚西前巴尔干蒂通尼/白垩纪边界区间的钙钛矿生物地层和微地层

保加利亚西前巴尔干地区的上蒂通统和下贝里亚统（Gintsi 和 Glozhene 地层）代表了一种显著的、地层扩展的浮游结核状和微粒状灰岩记录。研究的 50 多个薄切片显示了 Chitinoidella、Praetintinnopsella、Crassicollaria 和 Calpionella 区的演替，并进一步划分为亚区。记录了 22 个壳斗类（Almajella 属、Borziella 属、Carpathella 属、Chitinoidella 属、Daciella 属、Dobeniella 属、Longicollaria 属和 Praetintinnopsella 属）和 26 个钙斗类（Tintinnopsella 属、Crassicollaria 属、Calpionella 属、Remaniella 属、Borzaiella 属和 Lorenziella 属）的地层范围。八个微地层（其中两个位于金特希地层）和六个微地层（位于格洛泽地层）已被区分开来，它们都是瓦基岩和泥岩，具有开放海洋浮游沉积的特征，在主要生物碎屑岩方面各不相同。Tithonian/Berriasian 边界暂定为 Crassicollaria/Calpionella 边界。

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Review of the Bulgarian Geological Society

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