The geochemistry of rare earth elements and yttrium (REY) in phosphorite has been widely studied. However, the effect organic matter on REY enrichment not well determined. We utilized paired inorganic (δ13Ccarb) carbon isotopes, total (TOC), content (∑REY) Zhijin Motianchong (MTC) compared them with those Meishucun (MSC) to reveal REY. δ13Ccarb MTC area (≈0‰) is heavier than that MSC (−5.23‰ −1...

Standard rock physics models are formulated to describe the behavior of porous sedimentary reservoirs, with clean sandstones being archetypal system; however, many situations demand geophysical monitoring rocks significantly different structures, such as low porosity, fractured reservoirs. Conventional also suggest that these “stiff” reservoirs can be challenging monitor seismically due small f...

Abstract In this contribution, a novel framework for simulating mixed-mode failure in rock is presented. Based on hybrid phase-field model fracture, separate variables are introduced tensile (mode I) and shear II) fracture. The resulting three-field problem features length scale parameters mode I II cracks. contrast to the classic two-field approaches, it can thus account different strength of ...

Timing and duration of ore deposit formation are crucial to understanding the mineralization process. To address this, geochronological (U-Th)/He method, geochemical H- O-isotope compositions pure goethite formed in Imini karst-hosted Mn district (High Atlas, Morocco) were examined detail. Two main generations cavity-filling fracture-filling identified, both precipitated prior massive oxide ore...

Abstract Tandem in situ and isotope dilution U-Pb analysis of zircons from pyroclastic volcanic rocks both glacial non-glacial sedimentary strata the Pocatello Formation (Idaho, northwestern USA) provides new age constraints on Cryogenian glaciation North American Cordillera. Two dacitic tuffs sampled within glacigenic lower diamictite interval Scout Mountain Member yield high-precision chemica...

Limited constraints on the variability of deep-water production in Labrador Sea complicate reconstructions strength Atlantic Meridional Overturning Circulation (AMOC) during Late Quaternary. Large volumes detrital carbonates were repeatedly deposited last 32 kyr, potentially affecting radiogenic Nd isotope signatures. To investigate this compositions deep and intermediate waters extracted from ...

For obtaining reservoir petrophysical properties, for example porosity, non-destructive methods such as X-ray computed tomography, CT, seems to be precise and accurate. Porosity is deducted from the CT image with a single scan via different techniques, such as pore space detection by image segmentation techniques then correlation with porosity. More than one hundred samples with carbonate li...

Thermochemical sulfate reduction (TSR) commonly occurred in the dolostone reservoirs of Upper Permian Changxing Formation (P3c) Yuanba (YB) gas field, Sichuan Basin, yet controversy remains regarding source required for TSR. To trace sulfate, sulfur and strontium isotopic compositions were measured three diagenetic celestite (SrSO4) samples found P3c YB field. In addition, Carbonate-associated ...