Geology of the Pomona quadrangle, Illinois.

Cover title.Bibliography: p. 15-16

Areal geology of the Illinois fluorspar district : Part III, Herod and Shetlerville Quadrangles

Ope

Mineralogical and Chemical Characteristics of Some Natural Jarosites

This paper presents a detailed study of the mineralogical, microscopic, thermal, and spectral characteristics of jarosite and natrojarosite minerals. Systematic mineralogic and chemical examination of a suite of 32 natural stoichiometric jarosite and natrojarosite samples from diverse supergene and hydrothermal environments indicates that there is only limited solid solution between Na and K at low temperatures, which suggests the presence of a solvus in the jarosite-natrojarosite system at temperatures below about 140 °C. The samples examined in this study consist of either end members or coexisting end-member pairs of jarosite and natrojarosite. Quantitative electron-probe microanalysis data for several natural hydrothermal samples show only end-member compositions for individual grains or zones, and no detectable alkali-site deficiencies, which indicates that there is no hydronium substitution within the analytical uncertainty of the method. In addition, there is no evidence of Fe deficiencies in the natural hydrothermal samples. Hydronium-bearing jarosite was detected in only one relatively young supergene sample suggesting that terrestrial hydronium-bearing jarosites generally are unstable over geologic timescales. Unit-cell parameters of the 20 natural stoichiometric jarosites and 12 natural stoichiometric natrojarosites examined in this study have distinct and narrow ranges in the a- and c-cell dimensions. There is no overlap of these parameters at the 1r level for the two end-member compositions. Several hydrothermal samples consist of fine-scale (2–10 lm) intimate intergrowths of jarosite and natrojarosite, which could have resulted from solid-state diffusion segregation or growth zoning due to variations in the Na/K activity ratio of hydrothermal solutions

Mineralogical and Chemical Characteristics of Some Natural Jarosites

This paper presents a detailed study of the mineralogical, microscopic, thermal, and spectral characteristics of jarosite and natrojarosite minerals. Systematic mineralogic and chemical examination of a suite of 32 natural stoichiometric jarosite and natrojarosite samples from diverse supergene and hydrothermal environments indicates that there is only limited solid solution between Na and K at low temperatures, which suggests the presence of a solvus in the jarosite-natrojarosite system at temperatures below about 140 °C. The samples examined in this study consist of either end members or coexisting end-member pairs of jarosite and natrojarosite. Quantitative electron-probe microanalysis data for several natural hydrothermal samples show only end-member compositions for individual grains or zones, and no detectable alkali-site deficiencies, which indicates that there is no hydronium substitution within the analytical uncertainty of the method. In addition, there is no evidence of Fe deficiencies in the natural hydrothermal samples. Hydronium-bearing jarosite was detected in only one relatively young supergene sample suggesting that terrestrial hydronium-bearing jarosites generally are unstable over geologic timescales. Unit-cell parameters of the 20 natural stoichiometric jarosites and 12 natural stoichiometric natrojarosites examined in this study have distinct and narrow ranges in the a- and c-cell dimensions. There is no overlap of these parameters at the 1r level for the two end-member compositions. Several hydrothermal samples consist of fine-scale (2–10 lm) intimate intergrowths of jarosite and natrojarosite, which could have resulted from solid-state diffusion segregation or growth zoning due to variations in the Na/K activity ratio of hydrothermal solutions

Perioperative events influence cancer recurrence risk after surgery.

Surgery is a mainstay treatment for patients with solid tumours. However, despite surgical resection with a curative intent and numerous advances in the effectiveness of (neo)adjuvant therapies, metastatic disease remains common and carries a high risk of mortality. The biological perturbations that accompany the surgical stress response and the pharmacological effects of anaesthetic drugs, paradoxically, might also promote disease recurrence or the progression of metastatic disease. When cancer cells persist after surgery, either locally or at undiagnosed distant sites, neuroendocrine, immune, and metabolic pathways activated in response to surgery and/or anaesthesia might promote their survival and proliferation. A consequence of this effect is that minimal residual disease might then escape equilibrium and progress to metastatic disease. Herein, we discuss the most promising proposals for the refinement of perioperative care that might address these challenges. We outline the rationale and early evidence for the adaptation of anaesthetic techniques and the strategic use of anti-adrenergic, anti-inflammatory, and/or antithrombotic therapies. Many of these strategies are currently under evaluation in large-cohort trials and hold promise as affordable, readily available interventions that will improve the postoperative recurrence-free survival of patients with cancer

Interpretation of fischer assay data for the evaluation of analcime-bearing oil shale in the Green River Formation, Colorado and Utah

reportUsing Fischer assay data, an empirical method has been devised for distinguishing analcime-rich oil shale from oil shale which is essentially free of analcime in the Parachute Creek Member, Green River Formation, Colorado and Utah. This method permits evaluation of Fischer assay data in order to compute saline mineral resources and also permits detection of abundant analcime which may be important to processing methods used in aluminum recovery. The method also eliminates the need for X-ray diffraction analysis to determine analcime distribution. For all of the potentially commercial oil-shale zones in the Piceance Creek basin, analcime appears to be most abundant near the basin margins, and least abundant or absent in the middle of the basin. When analcime, dawsonite, and nahcolite are subjected to Fischer assay pyrolysis as components of oil shale, they react differently than is predicted by thermal studies of the pure minerals

Mineralogy of oil shale in the upper part of Parachute Creek member of the Green River Formation in the Eastern Uinta Basin, Utah

reportThe relative abundance and distribution of major and minor minerals have been determined by X-ray diffraction for samples of Green River Formation oil shale in three drill cores from the eastern part of the Uinta Basin, Utah. The samples in each core are from the same rock stratigraphic interval between the Curly bed and Wavy bed tuffs. This interval includes the Mahogany zone, which is the thickest and richest oil-shale unit with the greatest economic potential for extraction of oil. One core is from Naval Oil Shale Reserve No. 2, another is from Federal Prototype Oil Shale Lease Tract Ua, and the third is from an area nominated for a possible federal oil-shale in situ tract. Dolomite and quartz are generally the most abundant minerals; calcite, albite, and K-feldspar are less abundant. Minor minerals in varied amounts include illite, analcime, aragonite, and smectite. Smectite is abundant in one core and has not previously been recognized in the Mahogany zone. The presence of this mineral is important, in as much as it will increase retorting energy requirements. Saline minerals were not detected

Areal geology of the Illinois fluorspar district : Part 2, Karbers Ridge and Rosiclare Quadrangles.

Cover title.Includes bibliographical references (p. 39-40)

Pre-Pennsylvanian Evansville Valley and Caseyville (Pennsylvanian) sedimentation in the Illinois Basin

Bibliography: p. 15-16