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

Result code in 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>

Alternative codes found

RIV/00216208:11310/25:10499041

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA20-13644S" target="_blank" >GA20-13644S: Cherts and carbonates as geochemical proxies of paleoenvironmental conditions and Ocean Plate Stratigraphy</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Precambrian Research

ISSN

0301-9268

e-ISSN

1872-7433

Volume of the periodical

418

Issue of the periodical within the volume

March

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

15

Pages from-to

107708

UT code for WoS article

001409625800001

EID of the result in the Scopus database

2-s2.0-85215555420