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Regional conditions cause contrasting behaviour in U-isotope fractionation in black shales: Constraints for global ocean palaeo-redox reconstructions

期刊: CHEMICAL GEOLOGY, 2023; 623 ()

The U-isotope system is a well-established palaeo-redox proxy that potentially constrains the global extent of marine anoxia during average as well as......

Source versus weathering processes as controls on the Mackenzie river uranium isotope signature

期刊: CHEMICAL GEOLOGY, 2023; 625 ()

Uranium (U) isotope signatures (8238U) recorded in sedimentary archives provide insight into the paleo redox state of the ocean. But the robust interp......

Pore merging and flow focusing: Comparative study of undissolved and karstified limestone based on microtomography

期刊: CHEMICAL GEOLOGY, 2023; 627 ()

We develop methods for qualitative and quantitative assessment of pore geometry transformation within a rock as a result of karstification. We then ap......

Formation of hydrocarbons favored by high pressure at subduction zone conditions

期刊: CHEMICAL GEOLOGY, 2023; 630 ()

Subduction zones enable carbon transport to the deep Earth. Inorganic and organic carbon in fluids released from the subducted slab are important in w......

Influence of salinity on hydrogen isotope fractionation of n-alkanes in mangrove leaves and surface sediments: A comparison across various geomorphological settings

期刊: CHEMICAL GEOLOGY, 2023; 634 ()

Increasing attention has recently been paid to hydrogen isotope ratios of mangrove lipids due to their potential for reconstructing past salinity and ......

In situ Strontium isotope stratigraphy of fish teeth in deep-sea sediments from the western Clarion-Clipperton Fracture Zone, eastern Pacific Ocean

期刊: CHEMICAL GEOLOGY, 2023; 636 ()

The geochronology of deep-sea sediments beneath the carbonate compensation depth (CCD) presents a challenge due to the calcareous microfossils dissolu......

Paleoclimate-induced wildfires in a paleomire in the Ordos Basin, Northern China during the Middle Jurassic greenhouse period

期刊: CHEMICAL GEOLOGY, 2023; 637 ()

Paleo-wildfires are of great significance in the study of paleomire ecosystems. The products of such fires preserved in paleomires can provide detaile......

Assessing hydrological controls on the lithium isotope weathering tracer

期刊: CHEMICAL GEOLOGY, 2023; 642 ()

To investigate the impact of riverine discharge and weathering intensity on lithium isotopes (delta 7Li) in a mono-lithological terrain, this study ex......

In situ Raman spectroscopic measurement of the 13C/12C ratio in CO2: Experimental calibrations on the effects of fluid pressure, temperature and composition

期刊: CHEMICAL GEOLOGY, 2023; 615 ()

The carbon isotope (delta 13C) signature of CO2 within fluid inclusions is of significance to investigate because it can be used to decipher the carbo......

Dating fluid infiltration and deformation in the subducted ultramafic oceanic lithosphere by perovskite geochronology

期刊: CHEMICAL GEOLOGY, 2023; 615 ()

Carbonated ultramafic rocks (i.e., ophicarbonates) form by peridotite serpentinization and carbonation at the seafloor. Their metamorphic evolution is......

A novel trophic archive: Practical considerations of compound-specific amino acid δ15N analysis of carbonate-bound organic matter in bivalve shells (Arctica islandica)

期刊: CHEMICAL GEOLOGY, 2023; 615 ()

Compound-specific stable nitrogen isotope (delta 15N) analysis of amino acids (CSIA-AA) can be used to refine the trophic position (TP) of organisms a......

Evaluation of the molybdenum isotope system as a petroleum tracer: The Phosphoria petroleum system, western USA

期刊: CHEMICAL GEOLOGY, 2023; 617 ()

The molybdenum (Mo) isotope composition of organic-rich mudrocks is used to infer paleo-ocean redox con-ditions but the potential of this isotope syst......

Rare earth element signature modifications induced by differential acid alteration of rocks in the Iberian Pyrite Belt

期刊: CHEMICAL GEOLOGY, 2023; 619 ()

The efficient use of REE as tracers of weathering processes requires further data acquisition to establish robust connections between mechanisms, mine......

Precise measurement of 226Ra/230Th disequilibria in deep-sea sediments by high-sensitivity ICP-MS

期刊: CHEMICAL GEOLOGY, 2023; 620 ()

We describe a new method suitable for the precise and accurate determination of Ra-226 in porewater and sediment samples using a single-collector sect......

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