The Holocene Wolfenden tufa deposit in south-eastern British Columbia, western Canada, preserves a unique record of the earliest stages calcium carbonate deposition resulting from microbial extracellular polymeric substances-mediated precipitation amorphous (ACC) with partial transformation to monohydrocalcite (MHC) and subsequently nanocrystalline calcite. This is first documentation mineralog...

Abstract Several brachiopod-rich mud mounds occur in the upper Visean (Brigantian) of Derbyshire Carbonate Platform succession UK. The re-evaluation lithofacies architecture a mound complex, developed an intraplatform middle-ramp environment, led to recognition three associations: (a) 10 m thick basal unit automicrite boundstone with siliceous sponge spicules and brachiopod–bryozoan packstone w...

Seafloor authigenic carbonate crusts are widespread in various oceanic and marine settings, excluding high-latitude basins that corrosive to precipitation. Newly formed formations relatively rare modern Arctic sediments. Although the first-order principles of seep formation currently quite well constrained, little is known regarding duration or mode Siberian shelf. Large (massive slabs blocks) ...

In arid and semi-arid climates, soil development is strongly influenced by seasonal patterns biogenic activity, often results in pervasive pedogenic horizons consisting of highly concentrated carbonate. Brazil, such enriched calcium carbonate are common relatively well-studied paleosols the Upper Cretaceous Marília Formation. However, detailed analyses on sequence mineral precipitation phases r...

Abstract. Paleogene hyperthermals, including the Paleocene–Eocene Thermal Maximum (PETM) and several other smaller events, represent global perturbations to Earth's climate system are characterized by warmer temperatures, changes in floral faunal communities, hydrologic changes. These events identified geologic record globally negative carbon isotope excursions (CIEs), resulting from input of i...

A detailed sedimentological analysis of the Palaeocene Lockhart Limestone has been conducted to evaluate depositional environment, diagenetic processes and hydrocarbon potential eastern margin Upper Indus Basin. From bottom top, there are three microfacies recorded. The lower microfacies, composed fine-grained micrite some dolomite, reflect low energy calm palaeo-current in shallower section (1...

The exploration well ANH-CR-Montecarlo-1X, in the southern part of Cesar-Ranchería basin Colombia, cuts sedimentary rocks assigned to Cogollo Group (Barremian-Cenomanian). present study integrates petrographic techniques (thin section microscopy and scanning electron microscopy), geochemistry (total organic carbon pyrolysis rock-eval) basic petrophysics establish thermal maturity potential thes...

Methane-derived authigenic seep carbonates occur globally along continental margins. These are important archives to identify dynamics, the source of ascending methane-enriched fluids together with their timing, and an carbon sequestration mechanism. Recently, were discovered in Levant Basin South-Eastern Mediterranean Sea. To elucidate past seepage activity dynamics across basin, different car...

A 95 m thick succession of grey siliceous limestone and marl on Mount Rettenstein in the Northern Calcareous Alps allowed us to study well-preserved diverse radiolarian assemblages across Sinemurian–Pliensbachian boundary. The distribution 31 most characteristic species is presented. Ammonites Jamesoni Subzone, topmost subzone Zone, have been previously found upper part section. data are comple...