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The Subduction of Hydrogen: Deep Water Cycling, Induced Seismicity, and Plate Tectonics
Structure and compressibility of Fe-bearing Al-phase D
A water transport system across the mantle transition zone beneath western North America as imaged by electrical conductivity data
A multi-faceted experimental study on the dynamic behavior of MgSiO 3 glass in the Earth’s deep interior
Ab initio study of the structure and relative stability of MgSiO 4 H 2 polymorphs at high pressures and temperatures
Melting phase relation of Fe-bearing Phase D up to the uppermost lower mantle
Crystal chemistry and high-temperature vibrational spectra of humite and norbergite: Fluorine and titanium in humite-group minerals
Ultramagnesian Olivine in the Monchepluton (Fo 96 ) and Pados-Tundra (Fo 93 ) Layered Intrusions (Kola Peninsula)
Incorporation of Mg in phase Egg, AlSiO 3 OH: Toward a new polymorph of phase H, MgSiH 2 O 4 , a carrier of water in the deep mantle
Extremely magnesian olivine in igneous rocks
Stability of Al-bearing superhydrous phase B at the mantle transition zone and the uppermost lower mantle
X-ray single-crystal structural characterization of Na 2 MgSiO 4 with cristobalite-type structure synthesised at 22 GPa and 1800 °C
Abstract: The lacustrine carbonate reservoirs of the South Atlantic host significant accumulations of chemically reactive and Al-free Mg-silicate minerals (e.g. stevensite, kerolite and talc). Petrographic data from units such as the Cretaceous Barra Velha Formation in the Santos Basin suggest that Mg-silicate minerals strongly influenced, and perhaps created, much of the observed secondary porosity. The diagenetic interactions between reactive Mg-silicate minerals and carbonate sediments are, however, poorly known. Here we develop a conceptual model for the origin of secondary porosity in the Barra Velha Formation guided by considerations of the chemistry that triggers Mg-silicate crystallization, as well as the geochemical and mineralogical factors that act as prerequisites for rapid Mg-silicate dissolution during early and late diagenesis. We conclude that sub-littoral zones of volcanically influenced rift lakes would have acted as the locus for widespread Mg-silicate accumulation and preservation. Organic-rich profundal sediments, however, would be especially prone to Mg-silicate dissolution and secondary porosity development. Here, organic matter diagenesis (especially methanogenesis) plays a major role in modifying the dissolved inorganic carbon budget and the pH of sediment porewaters, which preferentially destabilizes and then dissolves Mg-silicates. Together, the sedimentological, stratigraphic and geochemical predictions of the model explain many enigmatic features of the Barra Velha Formation, providing a novel framework for understanding how Mg-silicate–carbonate interactions might generate secondary porosity more broadly in other lacustrine carbonate reservoirs across the South Atlantic.