mineralized plagioclase

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  Mingjian CAO | Professor | Dr. | Chinese Academy of …

  A systematic elemental and Sr isotopic study of plagioclase crystals from mineralized diorite and granodiorite porphyry constrains the processes of crystalliz...

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  New Constraints on the Main Mineralization Event Inferred …

  20191031 · The V1A andesite (89–90 Ma) is plagioclase-hornblende phyric, holocrystalline and ubiquitously hydrothermally altered and/or mineralized, whereas the V1B (85–86 Ma) is hornblende-plagioclase phyric, holo- …

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  Clay Mineralogy of Phyllic and Intermediate Argillic Alteration at ...

  200231 · Intermediate argillic alteration consists of smectite, illite, and kaolinite that occur primarily as a replacement of plagioclase phenocrysts. A few veins of intermediate argillic minerals are present in the quartz monzonite porphyry. Illite is interstratified with an average of 6 percent smectite (R > 3 ordering), but a few samples contain a regular …

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  Phenocryst Zonation in Porphyry-Related Rocks of the …

  2018514 · Most euhedral plagioclase phenocrysts show well-developed zoning, or complex zonation with significant patchy zones in the core ( Fig. 2j–l ). Primary amphibole crystals occur as inclusions in the patchy areas ( Fig. 2j–l) or in oscillatory zones of plagioclase, indicating the early formation of amphibole.

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  In Situ Elemental and Sr Isotope Characteristics of Magmatic …

  202061 · Abstract At the Black Mountain porphyry Cu-Au deposit in the Baguio district, Northern Luzon (Philippines), pre- and synmineralized rocks preserve magmatic and hydrothermal minerals (e.g., plagioclase, amphibole, titanite, and epidote) spanning the complete paragenesis of the deposit. Strontium isotope values in early crystallized …

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  Metal endowment reflected in chemical composition of …

  2018215 · Considering the magmatic stage, it is evident that variations in the H 2 O contents of silicate magmas (traced by An% and Al content of plagioclase) could be linked directly to the mineralization potential of mineralized porphyry intrusions, such that higher mineralization efficiency is observed with increasing of partial pressure of water.

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  Plagioklas - Eigenschaften, Verwendung und Entstehung

  2024429 · Unter dem Begriff Plagioklas, alternativ Kalknatronfeldspat genannt, wird in der Mineralogie eine Mischreihe von Mineralien bezeichnet – die Albit - Anorthit -Mischreihe. Der Name Plagioklas stammt aus dem Griechischen und wird in Anlehnung an die zwei, schief zueinander stehenden Hauptspaltungsebenen mit schief übersetzt.

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  Genetic Interpretation of the Distribution of PGE and …

  20181221 · To determine the bulk-rock concentrations of major and trace elements and those of PGE, we have selected 47 rocks to represent the chilled zone of the intrusion (six samples), lower “Ir–Ru” unit of the plagioperidotites (four samples; Ariskin et al., 2018), and 37 poorly mineralized plagioclase-bearing dunites from the stratigraphic level ...

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  Minerals | Free Full-Text | Mineralogical Constraints on the …

  2020218 · Secondary plagioclase replaced magmatic plagioclase and potassium feldspar and is associated with hydrothermal actinolite, titanite, apatite, chlorite, and epidote-allanite in the sodic-calcic alteration. It forms unzoned euhedral to subhedral crystals up to 0.1 mm in length.

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  Geochronology and geochemistry of mineralized and barren …

  2021121 · Whole rock major and trace elements indicate that both Triassic mineralized and barren rocks underwent significant fractional crystallization, with the Triassic barren rocks displaying much stronger plagioclase fractionation.

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