Nitrogen isotopes of marine oils in the Tarim Basin, China: Implications for the origin of organic matters and the paleoenvironment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F24%3A00604109" target="_blank" >RIV/61389005:_____/24:00604109 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S199582262400133X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S199582262400133X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.petsci.2024.05.016" target="_blank" >10.1016/j.petsci.2024.05.016</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Nitrogen isotopes of marine oils in the Tarim Basin, China: Implications for the origin of organic matters and the paleoenvironment

Popis výsledku v původním jazyce

Nitrogen isotope compositions (S15N) of sedimentary rocks are usually used to reconstruct the paleoenvironment and nitrogen (N) biogeochemical cycle. The S 15 N values of crude oils inherit the characteristics of relevant source rocks and can well reflect the information of hydrocarbon-forming organisms and environment in ancient water column. However, studies on the S 15 N of crude oils are limited due to the low N content. In this study, a new efficient method is applied to the marine oils from the Bashituo (BST) and Halahatang (HLHT) areas of the Tarim Basin to obtain the nitrogenous components (i.e., nonhydrocarbons and asphaltenes) for the achievement of N concentration. The carbon and nitrogen isotopes of these components and the biomarkers of oils were measured. The S 15 N values in asphaltenes ( S 15 N Asp ) are significantly heavier than those in nonhydrocarbons ( S 15 N NSOs ) in these oils, which are attributed to the potential directional N transfer and kinetic isotope fractionation during the thermal evolution of organic matters (OM). The S 15 N Asp values have significant correlations with OM origin associated parameters and weak correlations with environmental parameters, suggesting that the difference in S 15 N Asp values is mainly resulted from biological source rather than redox conditions. The S 15 N NSOs values have a closer relationship with the redox condition than biological characteristics, indicating that they have a good response to paleoenvironmental variation in the water column, which is not completely overprinted by the difference of OM origin. Different redox conditions give rise to distinct nitrogen cycles, resulting in various S 15 N values. Anammox occurs in the water column of the Early Cambrian dominated by physically stratified conditions with significant isotope fractionation, resulting in relatively heavier S 15 N of OM in the BST area. In the Middle-Late Ordovician period, the limited suboxic zone leads to an insignificant positive bias of S 15 N caused by partial denitrification in the HLHT oils. The evaluation of S 15 N in nitrogenous fractions enables a more comprehensive reconstruction of N cycle for ancient oceans.

Název v anglickém jazyce

Nitrogen isotopes of marine oils in the Tarim Basin, China: Implications for the origin of organic matters and the paleoenvironment

Popis výsledku anglicky

Nitrogen isotope compositions (S15N) of sedimentary rocks are usually used to reconstruct the paleoenvironment and nitrogen (N) biogeochemical cycle. The S 15 N values of crude oils inherit the characteristics of relevant source rocks and can well reflect the information of hydrocarbon-forming organisms and environment in ancient water column. However, studies on the S 15 N of crude oils are limited due to the low N content. In this study, a new efficient method is applied to the marine oils from the Bashituo (BST) and Halahatang (HLHT) areas of the Tarim Basin to obtain the nitrogenous components (i.e., nonhydrocarbons and asphaltenes) for the achievement of N concentration. The carbon and nitrogen isotopes of these components and the biomarkers of oils were measured. The S 15 N values in asphaltenes ( S 15 N Asp ) are significantly heavier than those in nonhydrocarbons ( S 15 N NSOs ) in these oils, which are attributed to the potential directional N transfer and kinetic isotope fractionation during the thermal evolution of organic matters (OM). The S 15 N Asp values have significant correlations with OM origin associated parameters and weak correlations with environmental parameters, suggesting that the difference in S 15 N Asp values is mainly resulted from biological source rather than redox conditions. The S 15 N NSOs values have a closer relationship with the redox condition than biological characteristics, indicating that they have a good response to paleoenvironmental variation in the water column, which is not completely overprinted by the difference of OM origin. Different redox conditions give rise to distinct nitrogen cycles, resulting in various S 15 N values. Anammox occurs in the water column of the Early Cambrian dominated by physically stratified conditions with significant isotope fractionation, resulting in relatively heavier S 15 N of OM in the BST area. In the Middle-Late Ordovician period, the limited suboxic zone leads to an insignificant positive bias of S 15 N caused by partial denitrification in the HLHT oils. The evaluation of S 15 N in nitrogenous fractions enables a more comprehensive reconstruction of N cycle for ancient oceans.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Petroleum Science

ISSN

1672-5107

e-ISSN

1995-8226

Svazek periodika

21

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

CN - Čínská lidová republika

Počet stran výsledku

14

Strana od-do

3692-3705

Kód UT WoS článku

001392236400001

EID výsledku v databázi Scopus

2-s2.0-85211123261