Phlogopite 40Ar/39Ar Geochronology for Guodian Skarn Fe …
Numerous attempts have been made to constrain the timing of skarn Fe deposits, mainly by U-Pb dating of U-bearing hydrothermal accessory minerals, such as zircon, titanite, 40 Ar/ 39 Ar dating of K-bearing alteration phases, such as phlogopite [5,6], and U-Pb dating of zircon from ore-related intrusions [7,8].
Kinetics of muscovite, phlogopite, and biotite dissolution and
The reaction kinetics of dioctahedral muscovite and ctahedral phlogopite and biotite were studied in aqueous solutions at pH 1–4 and room temperature. The experiments were performed in a reactor where mineral suspensions were separated from eluent solutions with dialysis membranes. Dissolution of muscovite was close to stoichiometric.
Phlogopite-Forming Reactions as Indicators of …
Phlogopite is widely accepted as a major mineral indicator of the modal metasomatism in the upper mantle within a very wide P–T range. The paper reviews data on various phlogopite-forming reactions in upper-mantle …
Vermiculitization of Phlogopite in Metagabbro, Central Turkey
Secondary minerals are hornblende, actinolitic hornblende, Fe-rich phlogopite, and vermiculite. A two-phase history of alteration involving acidic weathering and alkaline metasomatism is suggested for the dioctahedral vermiculite and …
Alteration, formation, and occurrence of …
PDF | On Jan 1, 2012, G.J. Churchman and others published Alteration, formation, and occurrence of minerals in soils | Find, read and cite all the research you need on ResearchGate
Calc-silicate alteration in the Hemlo gold deposit, Ontario; mineral
A late calc-silicate alteration characterizes the Archean Hemlo gold deposit in Ontario, Canada. Calc-silicate minerals, including epidote-clinozoisite, tremolite-actinolite, titanite, prehnite, pumpellyite, allanite, grossular garnet, antimonian vesuvianite, and armenite, occur as mono- or bi-mineralic veins or aggregates but are volumetrically minor in the main orebody (Golden …
Characterization of Altered Mica From Sokli, …
The most important mineralogical weathering processes are the partial dissolution of carbonates, local replacement of phlogopite by vermiculite, intense alteration of olivine, the partial replacement of magnetite by hematite, …
Dissolution process of phlogopite in acid solutions
Other | February 01, 1995. Dissolution process of phlogopite in acid solutions
Dissolution and Precipitation of Clay Minerals under …
Therefore, to determine mineral-specific CO 2 reaction mechanisms, phlogopite mixed with 1 M NaCl was reacted for 159 hours (with intermittent sampling) under 102 atm CO 2 pressure and 368 K as a ...
11. Hydrothermal Alteration
These hydrothermal alteration minerals may be transformed during metamorphism into andalusite, corundum, topaz, sil- ... limanite, kyanite, cordierite, garnet, phlogopite, and various orthopyroxenes and orthoamphiboles (Bonnet and Corriveau, 2007). Alteration textures range from weak alteration of only some of the minerals or matrix in the host ...
Hydrothermal alteration and its geochemistry of the Xiadian …
Paragenetic sequence of mineralization and alteration minerals for the Xiadian gold deposit, with the width of bars representing the mineral abundance estimated on a petrographic basis. ... The primary phlogopite underwent alteration, giving way to the formation of chlorite and acicular rutile. Similarly, the igneous magnetite was replaced by ...
Vermiculitization of Phlogopite in Metagabbro, Central Turkey
Petrographic and mineralogie studies show that the primary mineral phases in the host rock are diopside, tschermakitic hornblende, Fe-rich phlogopite, and plagioclase. ... acidic weathering and alkaline metasomatism is suggested for the dioctahedral vermiculite and secondary Fe-rich phlogopite, respectively. The alteration of phlogopite to ...
Dissolution Process of Phlogopite in Acid Solutions
The alteration experiments of phlogopite with 0.01 N HCl solution containing 0.1 M NaCl at 50°, 80° and 120°C have been carried out to aid in the understanding of the dissolution process of mica and the formation of secondary phases such as vermiculite and interstratified mica/vermiculite.
Phlogopite – Knowledge and References – Taylor & Francis
Proximal alteration is mapped as potassic—a term that can signify K-feldspar, biotite, muscovite, phlogopite or a mixture of these minerals. Sericitic, argillic, chloritic and propylitic alteration …
Phlogopite: Mineral information, data and localities.
Phlogopite: Mineral information, data and localities. Named in 1841 by Johann Friedrich August Breithaupt from the Greek φλογωποζ "phlogopos" for "resembling fire", in allusion to …
WEATHERING OF PHLOGOPITE TO BEIDELLITE IN A …
The control on the mechanism of mineral alteration and alteration products is exercised by rock, water and environmental factors in variable proportions, frequently in ways that challenge our predictions (de la Fuente and others, 2002). In this paper, we investigate the alteration of phlogopite within a volcanoclastic matrix by carbonate
Phlogopite
The minerals developed between these olivine and orthopyroxene crystals are plagioclase, augite, phlogopite and sulfide. The phlogopite commonly contains small elongate needles of apatite. These inclusions have remarkably high phlogopite content, sometimes approaching 15%, and up to 1% apatite (eg, Lightfoot et al., 1997c; Warner et al., 1998).
WEATHERING OF PHLOGOPITE TO BEIDELLITE IN A …
we investigate the alteration of phlogopite within a volcanoclastic matrix by carbonate water in a karstic environment. ctahedral micas in the phlogopite–annite join have been observed to …
Supergene Vermiculitization of Phlogopite and Biotite in …
An X-ray diffraction study of vermiculitized micas in ultramafic and mafic intrusive rocks from Cheongyang, Korea, shows the following weathering sequence: mica → ordered mica/vermiculite interstratification → vermiculite. Electron microprobe analyses show the general trends of K leaching and Ca enrichment with increased weathering. The vermiculitization of …
Mineral chemistry and garnet U-Pb dating in the Bizmişen …
The aim of this study is to investigate the mineral chemistry of calc silicate and hydrous silicate minerals associated to the iron skarn system, and andradite-rich garnet U-Pb dating and phlogopite K-Ar dating in the Bizmişen skarn-type iron deposit for the first time, and to establish the better define the relationship between skarn formation and pluton on the scope of …
Phlogopite Mineral Data
PE Phlogopite = 2.30 barns/electron U=PE Phlogopite x r electron = 6.46 barns/cc. Radioactivity: GRapi = 133.53 (Gamma Ray American Petroleum Institute Units)
Hydrothermal alteration and short wavelength infrared …
The alteration mineral assemblage consist of serpentine + phlogopite + chlorite + actinolite + sapoite + talc. Alteration IV: distributed in the carbonate rocks with very weak alteration. The alteration mineral assemblage mainly consist of secondary montmorillonite + halloysite. 5.2. Parameters of chlorite ...
Phlogopite
The minerals developed between these olivine and orthopyroxene crystals are plagioclase, augite, phlogopite and sulfide. The phlogopite commonly contains small elongate needles of apatite. These inclusions have remarkably high phlogopite content, sometimes approaching …
Changes in phlogopites during their artificial alteration
When phlogopites containing only a little iron are artificially altered with sodium tetraphenylboron solutions, the vermiculite-like products contain fewer interlayer cations than …
Phlogopite: The Brown Mica, Rich in Magnesium
Phlogopite is a common member of the mica mineral group. It has a chemical composition of KMg 3 (AlSi 3 O 10) (F,OH) 2. Crystals of phlogopite are often brown, but can be yellow, green or reddish brown. It is sometimes called "the …
Supergene vermiculitization of phlogopite and biotite in …
Hi-Soo Moon, Yungoo Song, S. Y. Lee; Supergene vermiculitization of phlogopite and biotite in ultramafic and mafic rocks, central Korea. Clays and Clay Minerals 1994;; 42 (3): 259–268. doi: Download citation file:
Dissolution and structural alteration of phlogopite mediated …
The driving force behind alteration of phlogopite is the removal of K from interlayer regions of the mineral. In order for K to migrate rapidly, a suitable sink must exist. In this case, the precipitation of jarosite [KFe 3 (SO 4 ) 2 (OH) 6 ] provided the necessary sink.
Effects of repeated NaTPB-alteration and K-fixation …
Clays and Clay Minerals, 1972, Vol. 20, pp. 103-105. Pergamon Press. Printed in Great Britain Effects of repeated NaTPB-alteration and K-fixation upon a pblogopite (Received 13 September 1971) THE PARTICLE size of a phlogopite "weathered" in the laboratory by repeated K-removal and K-fixation was
VERMICULITIZATION OF PHLOGOPITE IN METAGABBRO, …
Petrographic and mineralogic studies show that the primary mineral phases in the host rock are diopside, tschermakitic hornblende, Fe-rich phlogopite, and plagioclase. ... acidic weathering and alkaline metasomatism is suggested for the dioctahedral vermiculite and secondary Fe-rich phlogopite, respectively. The alteration of phlogopite to ...
Micafort
MicaFort origin Muscovite is a constituent of acid igneous rocks like granite, pegmatite, or alaskite, some regionally metamorphosed rocks and clastic sedimentary rocks, and is a product of alteration.