Dawsonite: Mineral information, data and localities. - mindat.org
Colourless to white; rarely pink; colourless in transmitted light. Named by B.J. Harrington in 1874 in honor of Sir John William Dawson (13 October 1820, Pictou, Nova Scotia, Canada - 19 November 1899, Montreal, Quebec, Canada), Principal of McGill University and geologist, who first collected the mineral.
Petrology and isotopic geochemistry of dawsonite-bearing sandstones …
Sep 1, 2009 · Carbon dioxide for isotopic analyses was extracted by dawsonite decomposition as a laser was fired at the dawsonite surface in thin section. This system has a resolution of about 20 μm with an analytical precision of several μm. The isotopic data are presented relative to PDB for C and SMOW for O.
a) Image of a thin section of a sandstone sample collected from a …
While precipitated dawsonite can be preserved only in a hydrodynamically-closed system in the long term under high CO2 fugacity and log((Na⁺)/(H⁺)) activities in solution, short-term trapping ...
Dawsonite and ankerite formation in the LDX-1 structure, …
Sep 1, 2020 · The dawsonite and ankerite contents across the study area, measured on 159 thin sections, are shown in Fig. 5. Over the depths of this study (from 1841.6 m to 1868.89 m), dawsonite (0.7–8.3%) and ankerite (1.7–26.0%) in the LDX-1-1 well mainly developed near the gas water contact (GWC) ( Fig. 5 a).
Dawsonite occurrences related to the age and origin of CO2 …
Dec 29, 2016 · Thin section identification regarding the dawsonite-bearing sandstones was performed with an OLYMPUS polarizing microscope. Point-counting was used to quantify the contents of crystal fragments, rock fragments, terrigenous …
Characteristics and implication of multilayer dawsonite in ...
Sep 17, 2020 · Dawsonite cements are detected in both sandstone and mudstone of the Upper Cretaceous Qingshankou reservoir in Honggang anticline of the southern Songliao Basin, China. Here, we present results of a petrographic characterization of this reservoir based on polarizing microscope, X-ray diffraction, and fluid inclusion data.
Unveiling CCS Potential of the Rio Bonito Formation, Paraná Basin ...
Sep 6, 2024 · Dawsonite (Fig. 4B, 4C and 4E) was initially found in thin sections under polarized light optical microscopy (petrographic microscopy) within quartz sandstones containing grains ranging from 0.2 mm to 1.5 mm (Fig. 4A), alongside carbonate (identified in XRD as dolomite) and muscovite. The sandstone exhibited moderate to well-sorting, with ...
Dawsonite cement in the Triassic Lam Formation, Shabwa Basin, …
Jan 1, 2006 · Optical petrography was performed on 48 thin sections stained to discriminate feldspars as well as ferroan and non-ferroan calcite and dolomite (Dickson, 1965). All thin sections were examined to assess qualitatively the presence and textural types of carbonate cements as well as depositional and diagenetic fabrics.
(PDF) Dawsonite and ankerite formation in the LDX-1 structure ...
Jul 1, 2020 · Dawsonite and ankerite are formed just beneath a CO2 bearing anticlinal structure due to the reactions between silicate minerals (feldspars and clay minerals) and the fluid phase. Carbon and...
Synthesis and Characterization of High-Entropy Dawsonite-Type ...
Mar 12, 2023 · A dawsonite-type structure was synthesized and readily incorporated five cations with equimolar and homogeneous distribution, thus meeting the basic criterion for high-entropy materials and representing the first instance of this type of high-entropy material reported in the literature known to the authors.