Unravelling the Neoproterozoic oceanic sedimentary record: Insights from the Mona Complex Ocean Plate Stratigraphy, Wales

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F25%3A00616975" target="_blank" >RIV/67985831:_____/25:00616975 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/25:10499041

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0301926825000348?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0301926825000348?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.precamres.2025.107708" target="_blank" >10.1016/j.precamres.2025.107708</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Unravelling the Neoproterozoic oceanic sedimentary record: Insights from the Mona Complex Ocean Plate Stratigraphy, Wales

Popis výsledku v původním jazyce

Ocean Plate Stratigraphy (OPS) represents a sequence of volcanic and sedimentary rocks of the uppermost part of an oceanic plate typically preserved in tectonic stacks of an accretionary wedge. While the characteristics of Phanerozoic OPS are generally well-known, those of Neoproterozoic OPS, especially their sedimentary components, remain underexplored. We combined field observations with petrography and geochemistry (major and trace elements, Sr–Nd isotopes) of sedimentary rocks from the Gwna Group (Mona Complex, Wales, UK) representing a well-preserved example of Neoproterozoic OPS. The rocks were subdivided into five groups: (1) red chert/jasper, (2) carbonate/dolostone, (3) black mudstone, (4) red/green mudstone, and (5) turbiditic/volcaniclastic rocks. The carbonate rock and red chert fill interpillow spaces or form less than 2-meter-thick layers above a basaltic base. These rocks formed as chemical precipitates from hydrothermal fluid (εNd = −2.4 to −1.2) or hydrothermally fluxed seawater (εNd = −8.3 to −7.4) related to magmatic activity on the seafloor. Unlike Phanerozoic OPS, the studied OPS does not include a thick bedded chert sequence resulting from the accumulation of plankton remains. The red, green, and black mudstones were deposited on the ocean floor in a pelagic or hemipelagic environment under oxygenated and anoxic conditions. They were predominantly sourced from distal mature continental crust as exemplified by their low εNd values (−11.3 to −3.5). In contrast, the turbiditic and volcaniclastic rocks (εNd = −1.9 to +0.8) that form most of the Gwna Group were sourced from an adjacent volcanic arc and deposited in a trench. We show that the OPS lithological and compositional changes relate to Neoproterozoic plate motion and increasing proximity to a subduction zone. The OPS of the Gwna Group serves as a crucial paleooceanographic and paleogeographic indicator in the Neoproterozoic.

Název v anglickém jazyce

Unravelling the Neoproterozoic oceanic sedimentary record: Insights from the Mona Complex Ocean Plate Stratigraphy, Wales

Popis výsledku anglicky

Ocean Plate Stratigraphy (OPS) represents a sequence of volcanic and sedimentary rocks of the uppermost part of an oceanic plate typically preserved in tectonic stacks of an accretionary wedge. While the characteristics of Phanerozoic OPS are generally well-known, those of Neoproterozoic OPS, especially their sedimentary components, remain underexplored. We combined field observations with petrography and geochemistry (major and trace elements, Sr–Nd isotopes) of sedimentary rocks from the Gwna Group (Mona Complex, Wales, UK) representing a well-preserved example of Neoproterozoic OPS. The rocks were subdivided into five groups: (1) red chert/jasper, (2) carbonate/dolostone, (3) black mudstone, (4) red/green mudstone, and (5) turbiditic/volcaniclastic rocks. The carbonate rock and red chert fill interpillow spaces or form less than 2-meter-thick layers above a basaltic base. These rocks formed as chemical precipitates from hydrothermal fluid (εNd = −2.4 to −1.2) or hydrothermally fluxed seawater (εNd = −8.3 to −7.4) related to magmatic activity on the seafloor. Unlike Phanerozoic OPS, the studied OPS does not include a thick bedded chert sequence resulting from the accumulation of plankton remains. The red, green, and black mudstones were deposited on the ocean floor in a pelagic or hemipelagic environment under oxygenated and anoxic conditions. They were predominantly sourced from distal mature continental crust as exemplified by their low εNd values (−11.3 to −3.5). In contrast, the turbiditic and volcaniclastic rocks (εNd = −1.9 to +0.8) that form most of the Gwna Group were sourced from an adjacent volcanic arc and deposited in a trench. We show that the OPS lithological and compositional changes relate to Neoproterozoic plate motion and increasing proximity to a subduction zone. The OPS of the Gwna Group serves as a crucial paleooceanographic and paleogeographic indicator in the Neoproterozoic.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA20-13644S" target="_blank" >GA20-13644S: Silicity a karbonáty jako geochemické indikátory vzniku stratigrafie oceánských desek a paleoenvironmentálních změn</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Precambrian Research

ISSN

0301-9268

e-ISSN

1872-7433

Svazek periodika

418

Číslo periodika v rámci svazku

March

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

107708

Kód UT WoS článku

001409625800001

EID výsledku v databázi Scopus

2-s2.0-85215555420