This study aims to compare two approaches for the reserve calculation of cement raw material by geological sections and structural maps. The first is legally based, its accuracy approved periodical exploited on site. In this research, it was crucial determine deviation in approach, i.e., section volume versus obtained as a software solution estimated number cells between maps, maps interpolated...

Abstract The "Snowball Earths" were cataclysmic events during the late Neoproterozoic's Cryogenian period (720-635 Ma) in which most, if not all, of Earth’s surface was covered ice. Paleoenvironmental reconstructions these utilize isotopic systems, such as Δ 17 O and barium isotopes barites. Other zinc (Zn), can reflect seawater composition or environmental conditions (e.g., temperature changes...

The Cotinguiba Formation, of Cretaceous age, located in the Sergipe-Alagoas Basin, Brazilian Northeastern coast, comprises carbonate breccias and shales interlayered with fine to coarse clastic sediments (mudstones, marls), deposited maximum sea level episode during Cenomanian-Coniacian transgressive event. Core sections were selected from formation materials, which 20 plugs obtained, represent...

Authigenic carbonates of the northern Okinawa Trough have been shown to be contributed by both sulfate- and Fe-driven anaerobic oxidation methane (SD-AOM Fe-AOM, respectively); however, microorganisms involved remain poorly constrained. To better understand types roles in specific biological processes, authigenic collected from at water depths between ∼540 m 700 were studied using petrographic,...

Octocorallia (class Anthozoa, phylum Cnidaria) is a group of calcifying corals displaying wide diversity mineral skeletons. This includes skeletal structures composed different calcium carbonate polymorphs (aragonite and calcite). represents unique feature among anthozoans, as scleractinian (subclass Hexacorallia), main reef builders focus biomineralization research, are all characterized by an...

There are serious concerns that ocean acidification will combine with the effects of global warming to cause major shifts in marine ecosystems, but there is a lack of field data on the combined ecological effects of these changes due to the difficulty of creating large-scale, long-term exposures to elevated CO2 and temperature. Here we report the first coastal transplant experiment designed to ...

Abstract The Aysén-Río Mayo Basin was a back-arc/marginal basin developed in southwestern South America (43°–47°S) between the Tithonian–Aptian. Its sedimentary fill corresponds to Coyhaique Group, which represents transgressive–regressive succession. Six lithofacies and five microfacies were defined for three outcrops exposed south of (45°40’S). have mixed calcareous–volcaniclastic composition...

Oxygen-isotope measurements of fossil carbonates remain the most common method for paleoclimatic temperature reconstructions. A well-known limitation this approach is influence oxygen isotope composition water in which mineralization occurs, may vary significantly through space and time, often difficult to constrain precisely. Carbonate clumped-isotope thermometry an alternative applicable many...

The uranium isotopic composition (?238U) of bulk marine calcium carbonates has been extensively explored as a promising paleoredox proxy to track the extent global oceanic anoxia in deep time. Multiple studies have examined whether primary can directly capture seawater ?238U and measurements recent ancient preserve U isotope signatures. Here we assess role diagenesis altering signatures sedimen...