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Assessing the Effect of Aqueous Alteration on Soluble Organic Matter in Primitive Carbonaceous Chondrites: The Case of Asuka 12236 Vrije Universiteit Brussel
Carbonaceous chondrites (CCs) are considered the closest solid material to the composition of the early Solar System and can provide information about the origin of organic matter (OM) in the system and on Earth. Despite being primitive, their parent bodies have undergone secondary processes shortly after their formation (hydrothermal or metamorphism alterations) that blur their initial organic or mineral composition. The most primitive CC ...
Resolving impact volatilization and condensation from target rock mixing and hydrothermal overprinting within the Chicxulub impact structure Universiteit Gent Vrije Universiteit Brussel
Unraveling rare earth element signatures in hydrothermal carbonate minerals using a source–sink system KU Leuven
Rare earth element and yttrium (REEY) signatures in hydrothermal carbonate minerals are widely used proxies for studying hydrothermal mineralization. This review adopts a source–sink approach that synthesizes the current understanding of REEY mass transfer along the pathway of hydrothermal fluids. The merits of this process-centered approach are illustrated with representative examples, selected to disclose the interpretative possibilities and ...
Fault-related hydrothermal dolomites in Cretaceous carbonates (Cantabria, northern Spain): Results of petrographic, geochemical and petrophysical studies KU Leuven
The present contribution documents NW-SE oriented fault and fracture related dolomites in Aptian-Albian carbonates (Karrantza area; northern Spain). Field observations revealed two main dolomite types, namely massive and zebra dolomite. Texturally, these dolomite types are mostly planar and nonplanar and variably reworked by subsequent alterations, which resulted in neomorphism and recrystallization, cataclastic deformation and calcite filling ...
Fault-related hydrothermal dolomites in Cretaceous carbonates (Cantabria, northern Spain): Results of petrographic, geochemical and petrophysical studies KU Leuven
The present contribution documents NW-SE oriented fault and fracture related dolomites in Aptian-Albian carbonates (Karrantza area; northern Spain). Field observations revealed two main dolomite types, namely massive and zebra dolomite. Texturally, these dolomite types are mostly planar and nonplanar and variably reworked by subsequent alterations, which resulted in neomorphism and recrystallization, cataclastic deformation and calcite filling ...
Primary or secondary? A dichotomy of the strontium isotope anomalies in the Ediacaran carbonates of Saudi Arabia Vrije Universiteit Brussel
Secular variation of 87Sr/86Sr in carbonate strata has been widely used in regional and global chemostratigraphic correlations. Typically, diagenesis results in higher 87Sr/86Sr signals relative to their primary composition due to the alteration by Rb-rich fluids and the radiogenic decay of 87Rb to 87Sr. Surprisingly, the 87Sr/86Sr values in the Ediacaran limestones from Saudi Arabia (from 0.7029 to 0.7059) are significantly lower than the ...
Simultaneous ex-situ CO2 mineral sequestration and hydrogen production from olivine-bearing mine tailings Universiteit Gent
Hydrothermal alteration batch experiments were conducted on olivine bearing mine tailings in order to investigate two potential valorization methods: the ex-situ CO2 sequestration and hydrogen production. The originality of this work lies in the simultaneous investigation of these two processes. We reacted powdered mine tailings with CO2-saturated water at three different sets of P/T conditions, 473 K/15 MPa, 523 K/30 MPa and 573 K/30 MPa. After ...
Revisiting the Presolar Grain Inventory of the Y-691 Enstatite Chondrite Vrije Universiteit Brussel
Differences in the major element and isotope composition of carbonaceous, as well as unequilibrated ordinary and enstatite chondrites (EC) are thought to be the result of the fact that these meteorite classes sampled different regions of the solar nebula. The differences in the sampled nebular regions are also reflected in the presolar component of these meteorites, with carbonaceous chondrites showing the highest presolar grain contents among ...