New Middle Devonian conodont data from the Dong Van area, NE Vietnam (South China Terrane)

Narkiewicz, Katarzyna; Königshof, Peter

doi:10.1007/s12542-018-0408-6

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…Total ranges of key conodont taxa present in the studied samples, referred to the Eifelian to basal Frasnian polygnathid and icriodid zonation schemes (see Fig. 6), after Bultynck (2003), Bultynck (2003), Benfrika et al (2007), Narkiewicz and Bultynck (2007), Narkiewicz and Königshof (2018). B.…”

Section: Abbreviationsmentioning

confidence: 99%

The pre-Taghanic (Givetian, Middle Devonian) ecosystems of Miłoszów (Holy Cross Mts, Poland)

Halamski¹,

Baliński²,

Racki³

et al. 2022

ASGP

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The middle and upper parts of the Skały Fm, Early to Middle Givetian in age, were investigated in four sections at Miłoszów Wood in the Łysogóry Region (northern region of the Holy Cross Mountains, central Poland). The dating is based on conodonts (Polygnathus timorensis Zone to the later part of the Polygnathus varcus/Polygnathus rhenanus Zone; early Polygnathus ansatus Zone cannot be excluded) and spores (Ex1-2 subzones) and, coupled with cartographic analysis and geophysical investigation, allows correlation within the strongly faulted succession. Significant lateral facies variations within the carbonate ramp depositional system in comparison with the better studied Grzegorzowice-Skały section, about 3 km distant, are documented, thanks to conodont-based correlation of both successions. Foraminifers, fungi, sponges, rugose and tabulate corals, medusozoans, microconchids and cornulitids, polychaetes (scolecodonts), molluscs (bivalves, rostroconchs, and gastropods), arthropods (trilobites and ostracods), bryozoans, hederelloids, ascodictyids, brachiopods, echinoderms (mostly crinoids, rare echinoids, holuthurians, and ophiocistoids), conodonts, fish, plants (prasinophytes, chlorophycophytes, and land plant spores), and acritarchs are present. Brachiopods are the most diverse phylum present (68 species), other richly represented groups are bryozoans and echinoderms; in contrast, cephalopods and trilobites are low in diversity and abundance. The muddy, middle to outer ramp biota (200 marine taxa, including 170 species of marine animals, 22 photoautotrophs, 6 forams) represents a mixture of allochthonous shallower-water communities (upper BA3), including storm-and possibly tsunami-affected coral mounds, and autochthonous deep-water soft-bottom brachiopod (e.g., Bifida-Echinocoelia) communities (BA 4-5). The richness and diversity of the Miłoszów biota is relatively high, comparable with other approximately coeval pre-Taghanic ecosystems during the Devonian climatic deterioration (cooling). Preliminary data indicate that in the Holy Cross Mountains, no large-scale replacement of brachiopod (and probably many other benthic ones, like crinoids) communities took place between the Early-Middle Givetian and the Early Frasnian, in contrast to the demise of the Hamilton/ Upper Tully fauna in the Appalachian Basin. Such a similarity of pre-and post-Taghanic faunas does not exclude the occurrence of environmental perturbations and transient community turnovers, caused by immigrations during the Taghanic Biocrisis, but evidences the successful recovery of the indigenous biota.

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Section: Abbreviationsmentioning

confidence: 99%

The pre-Taghanic (Givetian, Middle Devonian) ecosystems of Miłoszów (Holy Cross Mts, Poland)

Halamski¹,

Baliński²,

Racki³

et al. 2022

ASGP

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“…Металлогеническая зона Ло Гам является частью юго-восточной окраины платформы Янцзы [22], где присутствует древний раннепротерозойский кристаллический фундамент [1,20]. В раннем палеозое-девоне зона отвечала периферии Южно-Китай-ского эпиконтинентального моря, которое окружало кратон Янцзы с запада и юго-запада [18] и отделяло его от расположенного восточнее кратонизированного блока Катазии. В это время зона Ло Гам была выражена в палеофациальном плане как подводная карбонатная возвышенность, на склонах которой в раннем девоне доминировало мелководное терригенное осадконакопление и локально проявлялся вулканизм [12].…”

Section: региональная позиция и геология зоны ло гамunclassified

Structural Conditions of Polymetal Mineralization Localization in the Cho Dien Ore Cluster in the Lo Gam Metallogenic Zone, Northern Vietnam

Kasatkin¹,

Ivin²,

Hoàng³

et al. 2022

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Structural research in the Cho Dien ore cluster and its environs has revealed that folds and faults were formed by sublatitudinal stresses. At the Nam Lung deposit, the stratified ore-bearing strata show evidences for upward interlayer migration of ore constituents, which is associated with wide development of interstratal thrusts during the anticline formation. Migrating ore constituents constrained by step faults cutting the anticline hinge zone accumulate to form low-angle ore shoots. Such a mechanism of structural control to mineralization is probably one of the conditions for most commercially important Pb-Zn deposits to be confined to the anticline hinge zone in the Cho Dien ore cluster.

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Lithofacies variability and facies analysis of a Givetian reef in the southwestern Lahn Syncline (Rhenish Massif, Germany)

Königshof,

Loos,

Rutkowski

2023

Palaeobio Palaeoenv

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A 200 m thick drill core penetrating the Givetian Hahnstätten Reef in the southwestern Lahn Syncline (Rhenish Massif) was investigated. A range of different depositional environments is described based on lithofacies and microfacies analysis. All in all, nine lithofacies types (FTs) are distinguished, which can include subfacies types. The majority of lithofacies of these ultrapure carbonates is represented by lime mudstone and fenestral microbialites, all pointing to shallow subtidal, intertidal to even supratidal low-energy palaeoenvironments. In contrast, more high-energy parts of the reef were dominated by bioclastic rubble deposits (e.g. rudstone). Autochthonous, reef-building carbonates are represented by bafflestone and framestone. Diversity of reef building organisms (stromatoporoids and corals) is low and is dominated by Stachyodes, Actinostroma, Stromatopora, and Thamnopora and alveolitids, respectively. Other bioclasts are brachiopods, gastropods, ostracods, foraminifera, echinoderms, trilobites, and conodonts in descending order. Development of the Hahnstätten Reef is interpreted as having been controlled mainly by synsedimentary tectonics and volcanism with contributions from eustasy. The occurrence of Stringocephalus burtini in the entire section and conodont findings, which provide more precise biostratigraphic data confirm an early to middle Givetian age (Polygnathus rhenanus/varcus Zone to Polygnathus ansatus Zone) of the succession. The average quality of the ultrapure carbonates lies at 97.68% CaO (excl. loss of ignition), with 70% of the core ranging between 98% and 99% CaO. This extremely high purity makes it difficult to identify correlations between lithofacies and geochemical data.

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New Middle Devonian conodont data from the Dong Van area, NE Vietnam (South China Terrane)

Cited by 5 publications

References 17 publications

The pre-Taghanic (Givetian, Middle Devonian) ecosystems of Miłoszów (Holy Cross Mts, Poland)

The pre-Taghanic (Givetian, Middle Devonian) ecosystems of Miłoszów (Holy Cross Mts, Poland)

Structural Conditions of Polymetal Mineralization Localization in the Cho Dien Ore Cluster in the Lo Gam Metallogenic Zone, Northern Vietnam

Lithofacies variability and facies analysis of a Givetian reef in the southwestern Lahn Syncline (Rhenish Massif, Germany)

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