[1] The mass accumulation rates of sedimentary components (carbonate, organic carbon, opal, barite, reactive phosphate, iron, terrigenous minerals, etc.) are used in many paleoceanographic reconstructions to learn about temporal and spatial changes in surficial Earth processes including wind stress and direction, oceanic circulation, weathering rates, marine productivity and ecosystem structure...

The kinetics of crystal growth in porous media controls a variety of natural processes such as ore genesis and crystallization induced fracturing that can trigger earthquakes and weathering, as well as, sequestration of CO2 and toxic metals into geological formations. Progress on understanding those processes has been limited by experimental difficulties of dynamically studying the reactive sur...

The thermostimulated luminescence (TSL) glow curve characteristics of ten barite crystals of Mangampeta mines (Cuddapah District of Andhra Pradesh, India) were analysed. The natural thermoluminescence (NTL) measurements were carried out for all the samples and show three peaks at 80oC, 120oC and 295C, when recorded with linear heating rate of 10°C/sec. The sample irradiated with a gamma dose o...

The sulphur isotopic composition of dissolved sulphate in seawater has varied considerably through time. Certain time intervals are characterised by distinct variations and a relatively high rate of change. These relatively rapid fluctuations allow for correlation of sediment sections using sulphur isotopes. Sulphur isotope reconstructions based on the analysis of carbonate associated sulphate ...

Celestite/barite−replaced and phosphate−replicated tubes of Early Cambrian anabaritids from the northern part of the Si− berian Platform (Anabar Shield) give new evidence on the wall−structure of these enigmatic fossils. The walls consist of fibres, interpreted as reflecting an original aragonitic fabric. Bundles of fibres are arranged in growth lamellae, and the latter form an angle of at leas...

The requirements for the quality and performance of brake pads railway rolling stock made various materials are analyzed. advantages cast iron produced at foundries shown. disadvantages composite based on rubber, asbestos, barite, carbon black other components noted. Ways to improve standards, specifications documentation these products proposed.

During the early Paleogene (59–50 Ma), several short-term global warming events, known as hyperthermal occurred. Negative carbon isotope (δ13C) excursions are a typical proxy for detecting events. recovery from δ13C values returned toward pre-event levels via scavenging lighter C isotopes ocean and sequestrating them within sediments. The biological pump plays key role in this process. Barium (...

Abstract The Ediacaran-Cambrian (E-C) succession in South China records remarkable oceanic, biological and geochemical variations, but it was not well defined geochronologically, which hinders the interpretation of spatio-temporal seawater chemical architecture during time E-C interval. This study presents two Re-Os isochron ages 520.2 ± 6.1 561.7 8.5 Ma for barite-rich black shales from top Li...