Maastrichtian Planktic Foraminiferal Paleoecology within the Tanjero Formation, Sulaymaniyah City, Kurdistan Region, Northeastern Iraq

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73633924" target="_blank" >RIV/61989592:15310/25:73633924 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.micropress.org/microaccess/stratigraphy/issue-422/article-2439" target="_blank" >https://www.micropress.org/microaccess/stratigraphy/issue-422/article-2439</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.29041/strat.22.4.03" target="_blank" >10.29041/strat.22.4.03</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Maastrichtian Planktic Foraminiferal Paleoecology within the Tanjero Formation, Sulaymaniyah City, Kurdistan Region, Northeastern Iraq

Popis výsledku v původním jazyce

This study focuses on planktic foraminifera to interpret the paleoecology and paleogeography of the uppermost 20 m of the Tanjero Formation below the Cretaceous/Paleogene (K/Pg) boundary of the Kurdistan Region, northeastern Iraq. In the lower part of the studied section, which was deposited in deep water (more than 100 m), the planktic foraminifera species with double-keeled tests Abathomphalus, Marginotruncana, Globotruncana, Gansserina, and Rugotruncana (Morphotype 3), are predominant. The middle part of the section is characterized by abundant species from the Globotruncanella and Globotruncanita genera, which have a single-keeled test, representing deposition in intermediate water (50–100 m depth) (Morphotype 2). The upper part of the section is marked by an abundance of genera with a nonkeeled test, including Hedbergella, Heterohelix, Pseudoguembelina, Pseudotextularia, Guembelitria, Planoheterohelix, Rugoglobigerina, Globigerinelloids Plummerita, and Rugotruncana, which are indicators of shallower water (approximately 50 m depth) (Morphotype 1). The diverse planktic foraminifera genera in this section are typical of Tethyan provinces, suggesting a stable, mesotrophic environment. The planktic foraminiferal assemblage from the uppermost part of the formation suggests paleoceanographic conditions that favored opportunistic organisms. This is evidenced by the presence of the genus Pseudoguembelina, a successful surface and subsurface dweller in tropical and subtropical open oceans with warm and oligotrophic surface waters. The expansion of this strongly photosymbiotic genus is attributed to favorable palaeoecological conditions in the Late Cretaceous oceans. The results obtained imply the presence of a well-stratified water column, a tropical to subtropical climate, and deposition in the outer shelf to upper bathyal environments. These conditions account for the presence of well-preserved and highly diversified Maastrichtian foraminifer assemblages of the globotruncanid species, which include: Hedbergella, Praeglobotruncana, Marginotruncana, Globotruncana, Contusotruncan, Globotruncanita, Archaeoglobigerina, Rugoglobigerina, Rugotruncana, Globotruncanella, Gansserina, and Abathomphalus.

Název v anglickém jazyce

Maastrichtian Planktic Foraminiferal Paleoecology within the Tanjero Formation, Sulaymaniyah City, Kurdistan Region, Northeastern Iraq

Popis výsledku anglicky

This study focuses on planktic foraminifera to interpret the paleoecology and paleogeography of the uppermost 20 m of the Tanjero Formation below the Cretaceous/Paleogene (K/Pg) boundary of the Kurdistan Region, northeastern Iraq. In the lower part of the studied section, which was deposited in deep water (more than 100 m), the planktic foraminifera species with double-keeled tests Abathomphalus, Marginotruncana, Globotruncana, Gansserina, and Rugotruncana (Morphotype 3), are predominant. The middle part of the section is characterized by abundant species from the Globotruncanella and Globotruncanita genera, which have a single-keeled test, representing deposition in intermediate water (50–100 m depth) (Morphotype 2). The upper part of the section is marked by an abundance of genera with a nonkeeled test, including Hedbergella, Heterohelix, Pseudoguembelina, Pseudotextularia, Guembelitria, Planoheterohelix, Rugoglobigerina, Globigerinelloids Plummerita, and Rugotruncana, which are indicators of shallower water (approximately 50 m depth) (Morphotype 1). The diverse planktic foraminifera genera in this section are typical of Tethyan provinces, suggesting a stable, mesotrophic environment. The planktic foraminiferal assemblage from the uppermost part of the formation suggests paleoceanographic conditions that favored opportunistic organisms. This is evidenced by the presence of the genus Pseudoguembelina, a successful surface and subsurface dweller in tropical and subtropical open oceans with warm and oligotrophic surface waters. The expansion of this strongly photosymbiotic genus is attributed to favorable palaeoecological conditions in the Late Cretaceous oceans. The results obtained imply the presence of a well-stratified water column, a tropical to subtropical climate, and deposition in the outer shelf to upper bathyal environments. These conditions account for the presence of well-preserved and highly diversified Maastrichtian foraminifer assemblages of the globotruncanid species, which include: Hedbergella, Praeglobotruncana, Marginotruncana, Globotruncana, Contusotruncan, Globotruncanita, Archaeoglobigerina, Rugoglobigerina, Rugotruncana, Globotruncanella, Gansserina, and Abathomphalus.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Stratigraphy

ISSN

1547-139X

e-ISSN

2331-656X

Svazek periodika

22

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

235-246

Kód UT WoS článku

001678376000002

EID výsledku v databázi Scopus

2-s2.0-105025933710