Universität zu Köln

Stichling, Soeren, Becker, Ralph Thomas, Hartenfels, Sven ORCID: 0000-0002-2243-2096, Aboussalam, Zhor Sarah and May, Andreas ORCID: 0000-0002-6714-3925 (2022). Drowning, extinction, and subsequent facies development of the Devonian Honne Valley Reef (northern Rhenish Massif, Germany). Palaeobiodiversity Palaeoenvironments, 102 (3). S. 629 - 697. HEIDELBERG: SPRINGER HEIDELBERG. ISSN 1867-1608

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Abstract

The Hagen-Balve Reef is one of the largest Devonian carbonate complexes in the Rhenish Massif exposed in many former or active, economically significant quarries, especially in the Honne Valley region at its eastern end. The timing and patterns of reef drowning, final extinction, and the middle Frasnian to middle Famennian post-reefal facies history, including details of the global Kellwasser Crisis, were studied based on two boreholes (HON_1101 and B102) and one outcrop at the Beul near Eisborn. More than 100 conodont samples provided a fine biostratigraphic framework and included new forms left in open nomenclature. The ca. upper 80 m of the new Asbeck Member of the Hagen-Balve Formation consists of relatively monotonous lagoonal successions assigned to four microfacies types. The local diversity of reef builders, mostly stromatoporoids, is low. Fenestral microbialites indicate very shallow and rather hostile back-reef settings. Near the Middle/Upper Devonian boundary, the eustatic pulses of the global Frasnes Events led to a significant backstepping of the reef margin, with reef core/outer slope facies overlying lagoonal facies. This flooding drastically reduced the carbonate accumulation rate and enabled the invasion of drowned back-reef areas by open-water organisms, such as polygnathid conodonts. Within this Eisborn Member, five microfacies types and numerous subtypes are distinguished including low-diversity coral gardens and a final, top lower Frasnian parabiostrome dominated by tabulate and colonial rugose corals. There was no cap stage (Iberg Facies). Two phases of the Basal Frasnes Event are marked by dark, organic rich limestones with subordinate reef builders. Based on conodont fauna from overlying nodular limestones of the new, (hemi-)pelagic Beul Formation, the final Honne Valley reef extinction was caused by the eustatic Middlesex Event at the lower/middle Frasnian boundary. Within the Beul Formation, eight subphotic submarine rise microfacies types are distinguished. After a lower middle Frasnian phase of extreme condensation, rich conodont faunas enable the recognition of most upper Frasnian to middle Famennian zones. The global semichatovae Event led to a regionally unique intercalation by four phases of organic-rich, laminated black shales and intervening thin limestones in core HON_1101. The Lower Kellwasser Event is represented in HON_1101 by atypical, moderately C-org-rich, recrystallized, peloidal ostracod-mollusk pack-grainstones. The Upper Kellwasser level begins with an ostracod bloom, followed either by recrystallized mollusk wacke-packstones (HON_1101) or laminated, argillaceous mudstones (B102). The first indicates a rarely documented shallow subphotic, better oxygenated setting than typical Upper Kellwasser facies. As elsewhere, the top-Frasnian conodont extinction was severe. The lower/middle Famennian carbonate microfacies of the Beul Formation is relatively monotonous and typical for an oxic, pelagic submarine rise. The youngest recorded nodular limestones fall in the Palmatolepis marginifera utahensis Zone. Regionally uniform lydites of the Hardt Formation show that the local palaeotopography was levelled before the base of the Visean. The Honne Valley case study and comparisons with western parts of the Hagen-Balve Reef and other Rhenish reefs underline the significance of Givetian to middle Frasnian eustatic and anoxic events as causes for reef extinctions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Stichling, Soeren UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, Ralph Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Hartenfels, Sven UNSPECIFIED orcid.org/0000-0002-2243-2096 UNSPECIFIED Aboussalam, Zhor Sarah UNSPECIFIED UNSPECIFIED UNSPECIFIED May, Andreas UNSPECIFIED orcid.org/0000-0002-6714-3925 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-670397
DOI:	10.1007/s12549-022-00539-x
Journal or Publication Title:	Palaeobiodiversity Palaeoenvironments
Volume:	102
Number:	3
Page Range:	S. 629 - 697
Date:	2022
Publisher:	SPRINGER HEIDELBERG
Place of Publication:	HEIDELBERG
ISSN:	1867-1608
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HOLY CROSS MOUNTAINS; SEA-LEVEL CHANGES; ANTI-ATLAS; MAGNETIC-SUSCEPTIBILITY; KELLWASSER-HORIZONS; GRAPHIC CORRELATION; FRASNIAN CONODONTS; CANNING BASIN; STROMATACTIS; BOUNDARY Multiple languages Biodiversity Conservation; Paleontology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67039