Scapolitization in the Cloncurry district of north-western Queensland

Edwards, A. B.; Baker, George

doi:10.1080/14400955308527845

Cited by 28 publications

(14 citation statements)

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“…and NaCl (De Jong and Williams, 1995). The observations are consistent with regional-scale scapolite alteration in the district (Edwards and Baker, 1953).…”

Section: Applications To Petrologysupporting

confidence: 75%

Experimental determination of quartz solubility in H2O-CaCl2 solutions at 600–900 °C and 0.6–1.4 GPa

Makhluf,

Newton,

Manning

2023

American Mineralogist

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Fluid-mediated calcium metasomatism is often associated with strong silica mobility and the presence of chlorides in solution. To help quantify mass transfer at lower crustal and upper mantle conditions, we measured quartz solubility in H2O-CaCl2 solutions at 0.6-1.4 GPa, 600-900 °C, and salt concentrations to 50 mol%. Solubility was determined by weight loss of singlecrystals using hydrothermal piston-cylinder methods. All experiments were conducted at salinity lower than salt saturation. Quartz solubility declines exponentially with added CaCl2 at all conditions investigated, with no significant evidence for complexing between silica and Ca. The decline in solubility is similar to that in H2O-CO2 but substantially greater than that in H2O-NaCl at the same pressure and temperature. At each temperature, quartz solubility at low salinity (XCaCl2 < 0.1) depends strongly on pressure, whereas at higher XCaCl2 it is nearly pressure independent. This behavior is consistent with a transition from an aqueous solvent to a molten salt near XCaCl2 ~ 0.1. The solubility data were used to develop a thermodynamic model of H2O-CaCl2 fluids. Assuming an ideal molten salt behavior and utilizing previous models for This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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“…and NaCl (De Jong and Williams, 1995). The observations are consistent with regional-scale scapolite alteration in the district (Edwards and Baker, 1953).…”

Section: Applications To Petrologysupporting

confidence: 75%

Experimental determination of quartz solubility in H2O-CaCl2 solutions at 600–900 °C and 0.6–1.4 GPa

Makhluf,

Newton,

Manning

2023

American Mineralogist

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“…Newton & Goldsmith (1975) showed meionite to be stable to very high pressures (=* 30 kb) and temperatures (^ 1500 °C). sample 1, table 3, Edwards & Baker, 1954) and also that many evaporites are now known in the nearby and stratigraphically similar McArthur River area (Dr N. Williams, pers. It is highly unlikely that the amount of NaCl present in the rocks originally at Mt Lofty varied Scapolite compositions, South Australia 353 systematically with metamorphic grade as the bedding is generally perpendicular to the isograd positions.…”

Section: Relation Of the Results To Other Studiesmentioning

confidence: 95%

“…9) showed that scapolites of the solid solution series marialite-meionite can be stable over essentially the entire solid solution range at 750 °C and 4 kb depending on the bulk composition of the system. If this is true then such compositions as are presented by Edwards & Baker (1954) for the Cloncurry area of NW Queensland on the basis of wet chemistry which give scapolite compositions in meta-calcareous shales of meionite 20-30 and low sulphur are anomalously low for their particular metamorphic grades. Orville's (1974) study of the P-T conditions for those compositions which are close to those obtaining in at least part of the Mt Lofty terrain during metamorphism showed that the scapolite composition must be related not to the present bulk composition of the rocks in which it has crystallized but rather to the particular metamorphic fluids generated in this, putative, relatively normal metamorphic terrain.…”

Section: Relation Of the Results To Other Studiesmentioning

confidence: 96%

Scapolite compositional change in a metamorphic gradient and its bearing on the identification of meta-evaporite sequences

Kwak

1977

Geol. Mag.

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Scapolite occurs in the NE Mt Lofty area of South Australia in rocks of bulk compositions as diverse as sulphide-rich veins, meta dolerite, scapolite (pelitic) schists, calc-silicate rocks and impure marbles. Scapolites analysed from all these rocks show with increasing grade a linear to near-linear change in composition from Me 50 and Me 66 . Some scatter around these values is attributed to local perturbations of falfco, in the fluid phase during metamorphism. Sulphur values as SO 3 are below the 0.02 level even when scapolite occurs in contact with sulphides in a vein in a small copper mine; here, however, an interpreted FeO value of 2.58 weight % was recorded. The values in this study are comparable with those of Heitanen (1967), and are believed to be representative of products of normal metamorphic fluids evolved from non-evaporitic metamorphic rocks under a greenschist-amphibolite facies gradient; they can thus be used as a standard in assessing the possible significance of meta-evaporites in other areas.

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“…11, figs. 1-4), and there is also evidence that such high chlorine solutions have added vast quantities of chlorine to some contact zones, in the form of scapolite and other minerals (Edwards and Baker, 1953;Krutov, 1960). Presumably the bulk of the chlorine in solution passed on through, except for that trapped in the fluid inclusions.…”

Section: Chlorine and Heavier Halogensmentioning

confidence: 99%

Composition of fluid inclusions

Roedder¹

1972

Professional Paper

212

126

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This, the sixth edition, has been written by several scientists in the Geological Survey and in other institutions in the United States and abroad, each preparing a..chapter on his special field. The current edition is being published in individual chapters, titles of which are listed below. Chapters already published are indicated by boldface. CHAPTER A. The chemical elements B. Cosmochemistry C. Internal structure and composition of the earth D. Composition of the earth's crust, by Raymond L. Parker E. Chemistry of the atmosphere F. Chemical composition of subsurface waters, by Donald E. White, John D. Hem, and G. A. Waring G. Chemical composition of rivers and lakes, by Daniel A. Livingstone H. Chemistry of the oceans • I. Geochemistry of the biosphere J. Chemistry of rock-forming minerals K. Volcanic emanations, by Donald E. White and G. A. Waring L. Phase-equilibrium relations of the common rock-forming oxides except water, by George W. Morey M. Phase-equilibrium relations of the common rock-forming oxides with water and (or) carbon dioxide N. Chemistry of igneous rocks 0. Chemistry of rock weathering and soils P. Chemistry of bauxites and laterites Q. Chemistry of nickel silicate deposits R. Chemistry of manganese oxides S. Chemical composition of sandstones-excluding carbonate and volcanic sands, by F. J. Pettijohn T. Nondetrital siliceous sediments, by Earle R. Cressman U. Chemical composition of shales and related rocks V. Chemistry of carbonate rocks W. Chemistry of iron-rich sedimentary rocks, by H. L. James X. Chemistry of phosphorites Y. Marine evaporites, by Frederick H. Stewart Z. Continental evaporites AA. Chemistry of coal BB. Chemistry of petroleum, natural gas, and miscellaneous carbonaceous substances CC. Chemistry of metamorphic rocks DD. Abundance and distribution of the chemical elements and their isotopes EE. Geochemistry of ore deposits FF. Physical chemistry of sulfide systems GG. The natural radioactive elements HH. Geochronology II. Temperatures of geologic processes JJ. Composition of fluid inclusions, by Edwin Roedder VII X CONTENTS ILLUSTRATIONS [Plates follow index] FRONTISPIECE. Photomicrographs showing relations of inclusions to host mineral. PLATES 1-12. Photomicrographs showing: 1. Mechanisms of trapping of primary inclusions. 2. Daughter minerals in Colombian emerald deposits. 3. Constancy of ratios of daughter minerals. 4. Evidence of immiscible fluids in nature. 5. Identification of gas composition by cooling procedures. 6. Behavior of large C0 2 inclusions in sapphire. 7. Phase changes on heating multiphase inclusions. 8. Phase changes on heating and cooling. 9. Evidence of preferential wetting phenomena among immiscible fluids in nature. 10. Secondary inclusions and necking down of inclusions. 11. Inclusion microscopy techniques and problems.

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Scapolitization in the Cloncurry district of north-western Queensland

Cited by 28 publications

References 1 publication

Experimental determination of quartz solubility in H2O-CaCl2 solutions at 600–900 °C and 0.6–1.4 GPa

Experimental determination of quartz solubility in H2O-CaCl2 solutions at 600–900 °C and 0.6–1.4 GPa

Scapolite compositional change in a metamorphic gradient and its bearing on the identification of meta-evaporite sequences

Composition of fluid inclusions

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