The Stability of Phlogopite in the Presence of Quartz and Diopside

Wones, David R.; Dodge, F. C. W.

doi:10.1007/978-94-010-1252-2_12

Cited by 29 publications

(26 citation statements)

References 11 publications

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“…20 in Table 2; Fig. 4) contradicts the results of Wood (1976) and Wones and Dodge (1977), whereas our data with a H 2 O-CO 2 ß uid (Fig. 5) are consistent with the 5 kbar bracket of Bohlen et al (1983).…”

Section: Phlogopite Stabilitysupporting

confidence: 74%

“…Our new experimental data on Equilibrium 1 indicate a signiÞ cantly reduced thermal stability of phlogopite + quartz over the older data of Wood (1976) and Wones and Dodge (1977), as concluded in the analysis of Berman (1988). Graphchikov et al (1999) have argued that the Wood!s (1976) position of the Equilibrium 1 in pure H 2 O is supported by the experiments of Clemens (1995).…”

Section: Phlogopite Stabilitysupporting

confidence: 60%

“…Keywords: Biotite, phase equilibria, experimental petrology, mixing properties, annite, phlogopite, siderophyllite, eastonite Much of this uncertainty stems from incomplete knowledge of the stability of the most important biotite end-members, phlogopite and annite. In the Mg-system, phase-equilibrium results on the stability Þ eld of phlogopite + quartz relative to enstatite + K-feldspar in pure H 2 O (Wood 1976;Wones and Dodge 1977;Peterson and Newton 1989;Clemens 1995) are compatible with one another. However, all are discordant with experimental results that require a smaller stability Þ eld for phlogopite in mixed H 2 O-CO 2 (Bohlen et al 1983) and H 2 O-KCl (Aranovich and Newton 1998) ß uids.…”

Section: Introductionmentioning

confidence: 83%

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Reversed phase equilibrium constraints on the stability of Mg-Fe-Al biotite

Berman

Aranovich

Rancourt

et al. 2007

American Mineralogist

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Biotite is a particularly important mineral in metamorphic rocks because of its occurrence not only in nature over a wide range of bulk compositions and metamorphic grades, but also computationally in numerous equilibria that represent useful thermobarometers and boundaries on petrogenetic grids. In spite of its obvious importance, quantitative calculations involving biotite continue to be relatively uncertain, as evidenced by major differences in computed petrogenetic grids for metapelites (e.g., Spear and Cheney 1989;Powell and Holland 1990;Pattison and Tracy 1991;Xu et al. 1994) and thermobarometric formulations involving biotite (e.g., Ferry and Spear 1978;Perchuk and Lavrent!eva 1983;Aranovich et al. 1988;Holdaway et al. 1997 ABSTRACTThe stability of Mg-Fe-Al biotite has been investigated with reversed phase-equilibrium experiments on four equilibria. Experimental brackets in pure H 2 O and H 2 O-CO 2 mixtures for the equilibrium:phlogopite + 3 quartz = enstatite + sanidine + H 2 O( 1) are in good agreement with previous experiments in mixed-volatile ß uids (Bohlen et al. 1983) and H 2 O-KCl solutions (Aranovich and Newton 1998), while indicating a reduced stability Þ eld for phlogopite compared to previous data in pure H 2 O (Wood 1976;Peterson and Newton 1989). Aluminum solubility in biotite has been determined in the Fe-, Mg-, and Fe-Mg systems from reversed phase-equilibrium data for the equilibria:

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Section: Phlogopite Stabilitysupporting

confidence: 74%

Section: Phlogopite Stabilitysupporting

confidence: 60%

Section: Introductionmentioning

confidence: 83%

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Reversed phase equilibrium constraints on the stability of Mg-Fe-Al biotite

Berman

Aranovich

Rancourt

et al. 2007

American Mineralogist

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“…This decomposition occurred during the igneous process as distinguished from hydrothermal biotite in terms of high Ti contents. Since the assemblage of phlogopite and diopside indicates higher temperature and/or lower H 2 O activity relative to hornblende-bearing assemblage (Wones and Guilbert, 1982;Wones and Dodge, 1977), pseudomorphic aggregates of biotite and clinopyroxene after hornblende phenocrysts in the adamellite porphyry at Nalumad and some boulders from Mount Kinabalu imply depression of H 2 O activity in these barren magmas. In addition, since igneous Caamphibole is not stable at lower H 2 O fugacity, while biotite and pyroxene are stable at low pressures (for example at 2 kbar, Naney and Swanson, 1980), the H 2 O fugacity in the barren magmas is supposed to be lower compared to that of the Mamut adamellite porphyry in which Caamphibole is abundant in the groundmass.…”

Section: Petrographymentioning

confidence: 99%

Genesis of the Mamut Porphyry Copper Deposit, Sabah, East Malaysia

Imai¹

2000

Resource Geology

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: The Mamut deposit of Sabah, East Malaysia, is a porphyry type Cu‐Au deposit genetically related to a quartz monzonite (“adamellite”) porphyry stock associated with upper Miocene Mount Kinabalu plutonism. The genesis of the Mamut deposit is discussed based on petrology of the intrusives in the Mount Kinabalu area combined with ore– and alteration–petrography, fluid inclusion and sulfur isotope studies. Groundmass of the adamellite porphyry at Mamut is rich in K which suggests vapor transport of alkaline elements during the mineralizing magmatic process, while the groundmass of the post‐ore “granodiorite” porphyry at Mamut contains small amounts of normative corundum suggesting depletion in alkaline elements at the root zone of the magma column. Sub‐dendritic tremolitic amphibole rims on hornblende phenocrysts in the Mamut adamellite porphyry suggest interaction between the mineralizing magma and the exsolved fluids. Occurrences of clinopyroxene microphenocrysts and pseudomor‐phic aggregates of shredded biotite and clinopyroxene after hornblende phenocrysts in the barren intrusives imply lower water fugacity and decreasing in water fugacity, respectively. Compositional gap between the core of hornblende phenocrysts and the tremolitic amphibole rims and those in the groundmass of the Mamut adamellite porphyry suggests a decrease in pressure. Higher XMg (=Mg/(Mg+Fe) atomic ratio) in the tremolitic amphibole rims in the Mamut adamellite porphyry compared to those of the barren intrusions suggests high oxygen fugacity. High halogen contents of igneous hydrous minerals such as amphiboles, biotite and apatite in the Mamut adamellite porphyry suggest the existence of highly saline fluids during the intrusion and solidification of the mineralizing magma. Fluid inclusions found in quartz veinlet stockworks are characterized by abundant hypersaline polyphase inclusions associated with subordinate amounts of immiscible gaseous vapor. Both Cu and Au are dispersed in disseminated and quartz stockwork ores. Chalcopyrite and pyrrhotite as well as magnetite are the principal ore minerals in the biotitized disseminated ores. Primary assemblage of intermediate solid solution (iss) and pyrrhotite converted to the present assemblage of chalcopyrite and pyrrhotite during cooling. Subsequent to biotitization, quartz veinlet stockworks formed associated with retrograde chlorite alteration. The Cu‐Fe sul–fides associated with stockwork quartz veinlet are chalcopyrite and pyrite. Overlapping Pb and Zn and subsequent Sb mineralizations were spatially controlled by NNE‐trending fractures accompanying the phyllic and advanced argillic alteration envelope. Sulfur isotopic composition of ore sulfides are homogeneous (about +2%) throughout the mineralization stages. These are identical to those of the magmatic sulfides of Mount Kinabalu adamellitic rocks.

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“…At lower P H2O and higher temperatures, the mole fraction of KAlSi3O8 is increased, and clinopyroxene and biotite will crystallize before amphibole (Wones and Dodge, 1977;Burnham, 1979). Thus, the cpx & bi-rich gabbro was formed at a lower P H2O and higher temperature than the amphibole-rich gabbro.…”

Section: Increase Of Water Pressure During Crystallizationmentioning

confidence: 99%

Petrology of an epizonal gabbroic suite: The Batow pluton, Yamizo Mountains, Central Japan.

Tanaka¹,

Huang

Nakamura

et al. 1987

J. Japan. Assoc. Min. Petr. Econ. Geol.

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The Batow pluton, an epizonal gabbroic body, Central Japan , was studied to delineate its geologic, petrographic and geochemical characteristics. Though the pluton is small, it exhibits a wide compositional range from melagabbro to granodiorite and varies from 42 .8 to 62.7 wt.% SiO2. The granitic rocks characterized by an abundance of amphibole (up to 39%) and a scarcity of biotite (less than 4%) were formed at a higher P H2O and lower temperature than early-crystallized gabbros. The close association of clinopyroxene-and biotite-rich gabbro, whose clinopyroxene and plagioclase often show reverse zoning in the Mg/(Mg+Fe*) ratio and An content, with amphibole-rich gabbro suggests that P H2O had increased rapidly during crystallization of the gabbroic melt. The intrusion of H2O-saturated granodioritic melt to the gabbroic melt may have caused the rapid increase of P H2O.

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The Stability of Phlogopite in the Presence of Quartz and Diopside

Cited by 29 publications

References 11 publications

Reversed phase equilibrium constraints on the stability of Mg-Fe-Al biotite

Reversed phase equilibrium constraints on the stability of Mg-Fe-Al biotite

Genesis of the Mamut Porphyry Copper Deposit, Sabah, East Malaysia

Petrology of an epizonal gabbroic suite: The Batow pluton, Yamizo Mountains, Central Japan.

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