Contrasting nutrient availability between marine and brackish waters in the late Mesoproterozoic: Evidence from the Paranoá Group, Brazil
Understanding the delayed rise of eukaryotic life on Earth is one of the most fundamental
questions about biological evolution. Numerous studies have presented evidence for …
questions about biological evolution. Numerous studies have presented evidence for …
Diagenetic nutrient supplies to the Proterozoic biosphere archived in divergent nitrogen isotopic ratios between kerogen and silicate minerals
EE Stüeken, AR Prave - Geobiology, 2022 - Wiley Online Library
Nitrogen isotopes and abundances in sedimentary rocks have become an important tool for
reconstructing biogeochemical cycles in ancient ecosystems. There are two archives of …
reconstructing biogeochemical cycles in ancient ecosystems. There are two archives of …
Transient deep-water oxygenation recorded by rare Mesoproterozoic phosphorites, South Urals
EE Stüeken, AB Kuznetsov, IM Vasilyeva… - Precambrian …, 2021 - Elsevier
The Mesoproterozoic deep ocean is thought to have been largely anoxic, dominated by
ferruginous conditions. Phosphate was scavenged from the water column by iron …
ferruginous conditions. Phosphate was scavenged from the water column by iron …
Pre‐treatment methods for accurate determination of total nitrogen and organic carbon contents and their stable Isotopic compositions: Re‐evaluation from geological …
This study reports total nitrogen (TN), carbon (TC) and organic carbon (TOC) contents, as
well as stable isotopic ratios (δ15NTN, δ13CTC and δ13Corg), from marine, stream and …
well as stable isotopic ratios (δ15NTN, δ13CTC and δ13Corg), from marine, stream and …
The Union Tin Member of the Rooiberg Group: Geodynamic implications for the Bushveld Large Igneous Province, South Africa
T Nazari-Dehkordi, A Hofmann, L Robb… - Precambrian …, 2024 - Elsevier
Abstract The Union Tin Member, comprising a succession of pyroclastic and shale-
dominated sedimentary rocks associated with the 2.05 billion-year-old Bushveld Large …
dominated sedimentary rocks associated with the 2.05 billion-year-old Bushveld Large …
Hydrothermal regeneration of ammonium as a basin-scale driver of primary productivity
Hydrothermal vents are important targets in the search for life on other planets due to their
potential to generate key catalytic surfaces and organic compounds for biogenesis. Less …
potential to generate key catalytic surfaces and organic compounds for biogenesis. Less …
[HTML][HTML] 富有机质页岩氮同位素分析方法研究
胡志中， 晏雄， 金鹭， 赵安坤， 徐国栋， 杜谷 - 岩矿测试, 2023 - cgsjournals.com
页岩氮同位素是重建古环境中生物地球化学循环的重要工具, 也为判断原油的沉积环境,
油源对比等提供地球化学指标, 但页岩氮同位素比值分析在研究中面临着含量较低 …
油源对比等提供地球化学指标, 但页岩氮同位素比值分析在研究中面临着含量较低 …
Safe, accurate, and precise sulfur isotope analyses of arsenides, sulfarsenides, and arsenic and mercury sulfides by conversion to barium sulfate before EA/IRMS
The stable isotope ratios of sulfur (δ 34S relative to Vienna Cañon Diablo Troilite) in sulfates
and sulfides determined by elemental analysis and isotope ratio mass spectrometry …
and sulfides determined by elemental analysis and isotope ratio mass spectrometry …
Influences of oxidation ability on precision in nitrogen isotope measurements of organic reference materials using elemental analysis‐isotope ratio mass spectrometry
N Wang, J Liu, Y Zhang, C Xia, D Lin… - Rapid …, 2021 - Wiley Online Library
Rationale The precision of the standard measurements of reference materials (RMs) is
critical to normalize the raw δ15N values of samples to the international scale. Because the …
critical to normalize the raw δ15N values of samples to the international scale. Because the …
[PDF][PDF] Influences of oxidation ability on precision in nitrogen isotope measurements of organic reference materials by EA-IRMS
W Nan, L Jingyu, Z Yang - Rapid Commun. Mass Spectrom., 2021 - baogeoscience.com
METHODS: Gas source isotope ratio mass spectrometry (IRMS) coupled with an online
elemental analyzer (EA) equipped with a single quartz reactor was performed to analyze the …
elemental analyzer (EA) equipped with a single quartz reactor was performed to analyze the …