Integrated conodont biostratigraphy and stable isotope chemostratigraphy from the Tremadocian (Lower Ordovician) of the Yangtze Platform, South China

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41330%2F25%3A103616" target="_blank" >RIV/60460709:41330/25:103616 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1144/jgs2024-214" target="_blank" >https://doi.org/10.1144/jgs2024-214</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1144/jgs2024-214" target="_blank" >10.1144/jgs2024-214</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Integrated conodont biostratigraphy and stable isotope chemostratigraphy from the Tremadocian (Lower Ordovician) of the Yangtze Platform, South China

Popis výsledku v původním jazyce

Tremadocian (Lower Ordovician) carbonate rocks were collected from the Xiangshuidong section in the Hubei Province, South China, and analysed for conodont biostratigraphy. A total of 24 species belonging to 16 genera were recovered from the Nantsinkuan and Fenhsiang formations. Three conodont zones are recognized based on this material: the Rossodus manitouensis Zone, Colaptoconus quadraplicatus-Paltodus pristinus Assemblage Zone and the Paltodus deltifer Zone, in ascending order. A biostratigraphic gap, corresponding to the Cordylodus lindstromi and Cordylodus angulatus zones, implies a major hiatus spanning the Cambrian-Ordovician boundary interval on the Yangtze Platform. A remarkable conodont faunal turnover is evident within the uppermost Rossodus manitouensis Zone and Colaptoconus quadraplicatus-Paltodus pristinus Assemblage Zone, corresponding to the early Tremadocian Base Stairsian Mass Extinction event (BSME). This turnover took place at a stratigraphic interval corresponding to the rising limb of the Top Skullrockian Isotopic Carbon Excursion (TSICE). According to the herein revised conodont biozonation of the Xiangshuidong section, a small but distinct positive shift in delta U-238 values begins in the lower part of the Colaptoconus quadraplicatus-Paltodus pristinus Assemblage Zone and contemporaneously with the TSICE. This shift suggests sustained improved oxygenation of the sea-floor environment in the early Tremadocian, post-BSME. There are no apparent delta U-238 changes before the BSME.

Název v anglickém jazyce

Integrated conodont biostratigraphy and stable isotope chemostratigraphy from the Tremadocian (Lower Ordovician) of the Yangtze Platform, South China

Popis výsledku anglicky

Tremadocian (Lower Ordovician) carbonate rocks were collected from the Xiangshuidong section in the Hubei Province, South China, and analysed for conodont biostratigraphy. A total of 24 species belonging to 16 genera were recovered from the Nantsinkuan and Fenhsiang formations. Three conodont zones are recognized based on this material: the Rossodus manitouensis Zone, Colaptoconus quadraplicatus-Paltodus pristinus Assemblage Zone and the Paltodus deltifer Zone, in ascending order. A biostratigraphic gap, corresponding to the Cordylodus lindstromi and Cordylodus angulatus zones, implies a major hiatus spanning the Cambrian-Ordovician boundary interval on the Yangtze Platform. A remarkable conodont faunal turnover is evident within the uppermost Rossodus manitouensis Zone and Colaptoconus quadraplicatus-Paltodus pristinus Assemblage Zone, corresponding to the early Tremadocian Base Stairsian Mass Extinction event (BSME). This turnover took place at a stratigraphic interval corresponding to the rising limb of the Top Skullrockian Isotopic Carbon Excursion (TSICE). According to the herein revised conodont biozonation of the Xiangshuidong section, a small but distinct positive shift in delta U-238 values begins in the lower part of the Colaptoconus quadraplicatus-Paltodus pristinus Assemblage Zone and contemporaneously with the TSICE. This shift suggests sustained improved oxygenation of the sea-floor environment in the early Tremadocian, post-BSME. There are no apparent delta U-238 changes before the BSME.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

JOURNAL OF THE GEOLOGICAL SOCIETY

ISSN

0016-7649

e-ISSN

0016-7649

Svazek periodika

182

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

001427998900001

EID výsledku v databázi Scopus

2-s2.0-85219623115