1 For copyright reasons several figures are excluded from this eprint version. For access to these, readers are referred to the published version of this manuscript or the cited papers. Abstract The hypothesis that reducing conditions exist in localized zones of high organic matter, termed microniches, was first suggested over a century ago, but only relatively recently have high-resolution tec...

Abstract The Teena Zn-Pb deposit is located in the Carpentaria Zn Province (Australia), which contains some of largest clastic dominant (CD-type) massive sulfide deposits world. timing main stage hydrothermal mineralization subbasin constrained to midstage burial diagenesis, during a period short-lived regional extension. To distinguish alteration from spatially and temporally overlapping diage...

The Cambrian-age Mt. Simon Sandstone, deeply buried within the Illinois Basin of the midcontinent of North America, contains quartz sand grains ubiquitously encrusted with iron-oxide cements and dissolved ferrous iron in pore-water. Although microbial iron reduction has previously been documented in the deep terrestrial subsurface, the potential for diagenetic mineral cementation to drive micro...

The noncarbonaceous Ediacaran discs of variable morphologies from the Jodhpur Sandstone Formation of the Marwar Supergroup, western Rajasthan, suggest different biologic affinities of plant and animal kingdom. These discs are commonly preserved on the bedding surfaces of siliciclastic sandstone and shale in strong positive relief and appear to possess a flexible to rigid body. Discs assignable ...

We compare the quantitative microstructural properties of Berea Sandstone with stochastic reconstructions of the same sandstone. The comparison is based on local porosity theory. The reconstructions employ Fourier space ltering of Gaussian random elds and match the average porosity and two-point correlation function of the experimental model. Connectivity properties of the stochastic models dii...

a key parameter for the application of polymer gels in water shut off treatment is the adsorption of polymer gel onto the rock surface. so, the adsorption properties of a nanocomposite hydrogel were discussed in this research by crosslinking of sulfonated polyacrylamide/sodium montmorillonite aqueous solutions with chromium triacetate. the x-ray diffraction patterns indicated that exfoliated ty...

The Sa’adi Formation is a part of the late Cretaceous period in Santonian-Campanian stage that represents potential hydrocarbon-bearing reservoir across many oilfields Mesopotamian Basin, South Iraq. was divided into two main parts as stratigraphy sequence. It consists chalky limestone with argillaceous upper and marly lower part. considered an important stratigraphic unit marked by petroleum s...

The resolution of current micro-CT scanning –a few microns – means that for many rocks, significant porosity cannot be imaged directly in three dimensions. Furthermore, alternative approaches, such as reconstruction through simulating sedimentation and diagenesis, may be problematic for many materials whose depositional and diagenetic history is uncertain or complex. In these cases it is necess...

—The Triassic System in the Zuni Mountains consists of one Middle Triassic unit, the Moenkopi Formation, the Upper Triassic Chinle Group, and the Upper Triassic-Lower Jurassic(?) Wingate Sandstone. The Chinle Group in the Zuni Mountains consists of six formations, in ascending order: Zuni Mountains (named here; = “mottled strata” of previous workers), Shinarump, Bluewater Creek, Petrified Fores...