scholarly journals Weak impact of landscape parameters and rock lithology on Mg isotope composition of the Yenisey River and its tributaries

2020 ◽  
Vol 540 ◽  
pp. 119547
Author(s):  
Vasileios Mavromatis ◽  
Anatoly S. Prokushkin ◽  
Mikhail A. Korets ◽  
Jérôme Chmeleff ◽  
Stéphanie Mounic ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Rock Lithology

Organic Matter of Domanik Deposits of the Timan–Pechora Basin: the Oil Window Conditions

2021 ◽  
Vol 62 (08) ◽  
pp. 859-865
Author(s):  
D.A. Bushnev ◽  
N.S. Burdel’naya ◽  
A.N. Shadrin ◽  
N.P. Fadeeva ◽  
M.B. Smirnov
Keyword(s):  
Organic Matter ◽  
Carbon Isotope ◽  
Isotope Composition ◽  
Bimodal Distribution ◽  
Carbon Isotope Composition ◽  
Pechora Basin ◽  
Rock Eval ◽  
Insight Into ◽  
Rock Lithology ◽  
Comprehensive Study

Abstract —A comprehensive study of Domanik deposits of the Timan–Pechora Basin has been carried out. The examined composition of hydrocarbon biomarkers, chemical structure of kerogen, carbon isotope composition, and rock lithology, the Rock-Eval pyrolysis data, and the contents of bitumen and Corg in the rocks give an insight into the geochemical processes in the oil window in the Domanik deposits, which took place at Tmax = 435–450 °C. The bitumen coefficient βCB is maximum in this temperature interval, reaching 30%. The obtained data on the distribution of polycyclic biomarkers in the Domanik rocks and the bitumen and Rock-Eval pyrolysis data allowed determining the boundary values of biomarker maturity coefficients in the study of the maturation of organic matter of the rocks. The carbon isotope composition of bitumen fractions in the Domanik rocks is considered, and the bimodal distribution of the δ13C values of the bitumen is shown.

Author response for "Neodymium isotope composition of Palaeoproterozoic Birimian shales from the Wa‐Lawra Belt, north‐west Ghana: Constraints on provenance"

2020 ◽  
Author(s):  
Marian S. Sapah ◽  
Jennifer E. Agbetsoamedo ◽  
Prince O. Amponsah ◽  
Samuel B. Dampare ◽  
Daniel K. Asiedu
Keyword(s):  
Isotope Composition ◽  
Author Response ◽  
North West

Hydrogeological responses in tropical mountainous springs

2019 ◽  
Author(s):  
Ricardo Sánchez-Murillo
Keyword(s):  
Costa Rica ◽  
Isotope Composition ◽  
Central Valley ◽  
Distribution Functions ◽  
Geochemical Composition ◽  
Transit Times ◽  
Management Plans ◽  
Best Fit ◽  
Term Data

This study presents a hydrogeochemical analysis of spring responses (2013-2017) in the tropical mountainous region of the Central Valley of Costa Rica. The isotopic distribution of δ18O and δ2H in rainfall resulted in a highly significant meteoric water line: δ2H = 7.93×δ18O + 10.37 (r2=0.97). Rainfall isotope composition exhibited a strong dependent seasonality. The isotopic variation (δ18O) of two springs within the Barva aquifer was simulated using the FlowPC program to determine mean transit times (MTTs). Exponential-piston and dispersion distribution functions provided the best-fit to the observed isotopic composition at Flores and Sacramento springs, respectively. MTTs corresponded to 1.23±0.03 (Sacramento) and 1.42±0.04 (Flores) years. The greater MTT was represented by a homogeneous geochemical composition at Flores, whereas the smaller MTT at Sacramento is reflected in a more variable geochemical response. The results may be used to enhance modelling efforts in central Costa Rica, whereby scarcity of long-term data limits water resources management plans.

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