Exploring the Indo-Mediterranean connection during the Miocene: Insights from the foraminiferal 143Nd/144Nd isotopic data from the Iranian corridor

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F25%3A00639065" target="_blank" >RIV/67985831:_____/25:00639065 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/25:10508594

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0921818125003674?dgcid=coauthor" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921818125003674?dgcid=coauthor</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gloplacha.2025.105058" target="_blank" >10.1016/j.gloplacha.2025.105058</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Exploring the Indo-Mediterranean connection during the Miocene: Insights from the foraminiferal 143Nd/144Nd isotopic data from the Iranian corridor

Popis výsledku v původním jazyce

The Miocene represents a critical period in the paleogeographic evolution of Eurasia, particularly in the Mediterranean region. Of special interest is the Middle Miocene, during which the closure of the enigmatic Indo-Mediterranean Gateway, which terminated water exchange between the Mediterranean and the Indian Ocean, remains incompletely understood. In this study, we present a unique geochemical dataset combining foraminiferal elemental ratios (Mg/Ca, Sr/Ca, Fe/Ca, Li/Ca) with Sr-Nd isotopic systematics from two Langhian-aged successions in Lorestan, Iran: Tang-e Shabikhun and Haft Cheshmeh. While the data reveal a notable presence of non‑carbonate material within foraminiferal tests, likely introduced through benthic fluxes, elevated Mg/Ca ratios may also reflect unusual paleoenvironmental conditions, potentially linked to warm, hypersaline settings prevailing during the Miocene Climatic Optimum. The analysed εNd values are relatively radiogenic and overlap with those reported from the Eastern Mediterranean, suggesting a palaeoceanographic connection between the two regions during the Langhian. In contrast, the detected Iranian εNd signatures differ markedly from those of the Indian Ocean and the Paratethys, indicating the absence of significant water mass exchange with these marine domains during this interval. These findings support the interpretation that, during the Langhian, the studied area formed part of a rather semi-enclosed marine basin characterized by low oxic, restricted conditions and sustained hydrographic connectivity with the Eastern Mediterranean.

Název v anglickém jazyce

Exploring the Indo-Mediterranean connection during the Miocene: Insights from the foraminiferal 143Nd/144Nd isotopic data from the Iranian corridor

Popis výsledku anglicky

The Miocene represents a critical period in the paleogeographic evolution of Eurasia, particularly in the Mediterranean region. Of special interest is the Middle Miocene, during which the closure of the enigmatic Indo-Mediterranean Gateway, which terminated water exchange between the Mediterranean and the Indian Ocean, remains incompletely understood. In this study, we present a unique geochemical dataset combining foraminiferal elemental ratios (Mg/Ca, Sr/Ca, Fe/Ca, Li/Ca) with Sr-Nd isotopic systematics from two Langhian-aged successions in Lorestan, Iran: Tang-e Shabikhun and Haft Cheshmeh. While the data reveal a notable presence of non‑carbonate material within foraminiferal tests, likely introduced through benthic fluxes, elevated Mg/Ca ratios may also reflect unusual paleoenvironmental conditions, potentially linked to warm, hypersaline settings prevailing during the Miocene Climatic Optimum. The analysed εNd values are relatively radiogenic and overlap with those reported from the Eastern Mediterranean, suggesting a palaeoceanographic connection between the two regions during the Langhian. In contrast, the detected Iranian εNd signatures differ markedly from those of the Indian Ocean and the Paratethys, indicating the absence of significant water mass exchange with these marine domains during this interval. These findings support the interpretation that, during the Langhian, the studied area formed part of a rather semi-enclosed marine basin characterized by low oxic, restricted conditions and sustained hydrographic connectivity with the Eastern Mediterranean.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10502 - Oceanography

Projekt

—

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

Global and Planetary Change

ISSN

0921-8181

e-ISSN

1872-6364

Svazek periodika

255

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

105058

Kód UT WoS článku

001577942300001

EID výsledku v databázi Scopus

2-s2.0-105015994718