A Tale of Two Plutons: Petrographic and Mineralogic Constraints on the Petrogenesis of the Red Lake and Eagle Peak Plutons, Central Sierra Nevada, California

Noyes, H. J.; Wones, David R.; Frey, Frederick A.

doi:10.1086/628784

Cited by 44 publications

(12 citation statements)

References 35 publications

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“…The paragenesis biotite ± Ca-amphibole + quartz + titanite + magnetite ± ilmenite indicates ƒ O2 conditions close to or higher than the TMQAI [titanite -magnetite -quartz -amphibole (Fe-tremolite) -ilmenite] buffer (Noyes et al 1983, Wones 1989, for which precise thermodynamic parameters were not well established yet. The fe# number [ = Fe/(Fe + Mg), cations] of biotite and amphiboles leads to a similar conclusion.…”

Section: Redox Conditionsmentioning

confidence: 99%

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Geology, petrography and geochemistry of the A-type granites from the Morro Redondo Complex (PR-SC), southern Brazil, Graciosa Province

Vilalva

Vlach

2014

An. Acad. Bras. Ciênc.

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The Morro Redondo Complex is one of the most important occurrences of the Graciosa A-type Province, southern Brazil. It consists of the Papanduva and Quiriri granitic plutons and a contemporaneous bimodal volcanic association. The Papanduva Pluton includes massive and deformed peralkaline alkali-feldspar granites with Na-Ca and Na-amphiboles and clinopyroxenes. The deformed types are the most evolved rocks in the province and carry rare 'agpaitic' minerals, some being described for the first time in granites from Brazil. The larger Quiriri Pluton comprises massive, slightly peraluminous, biotite syeno-and monzogranites with rare Ca-amphibole. Biotite compositions are relatively homogeneous, whereas sodic amphiboles and clinopyroxenes show increasing Na and Fe 3+ evolving paths. The Morro Redondo granites are ferroan, with high SiO 2 , alkalis and HFSE contents; the peralkaline types registering the highest fe#. LILE and HFSE abundances increase with the agpaitic index and the most evolved are HHP granites, with radiogenic heat production up to 5.7 μWm -3. Geothermobarometric estimates indicate emplacement under low pressures (~100 MPa), at temperatures up to 850-800 °C, and relatively reduced (QFM) and oxidized (+1 < Δ QFM < +3) environments for the Papanduva and Quiriri Plutons, respectively. In both cases, melts evolved to relatively high oxidation states upon crystallization progress.

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Section: Redox Conditionsmentioning

confidence: 99%

“…Vlach and Gualda 2007). Conversely, melts that formed the Quiriri granites crystallized under more oxidizing conditions (Δ QFM ≥ 1), close to the TMQAI buffer (Noyes et al 1983, Wones, 1989, with evolution also following an oxidizing path.…”

Section: Conclusion and Final Remarksmentioning

confidence: 99%

Geology, petrography and geochemistry of the A-type granites from the Morro Redondo Complex (PR-SC), southern Brazil, Graciosa Province

Vilalva

Vlach

2014

An. Acad. Bras. Ciênc.

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“…Broska et al 2006). The f O 2 was therefore approximated by the buffer TMQA (titanite-magnetite-quartz-amphibole; Noyes et al 1983) which is ca. 1.45 log unit above the NNO buffer.…”

Section: Estimation Of Oxygen Fugacitymentioning

confidence: 99%

Biotite from Čierna hora Mountains granitoids (Western Carpathians, Slovakia) and estimation of water contents in granitoid melts

Bónová¹,

Broska²,

Petrík³

2010

Geologica Carpathica

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“…Although magnetites in some granites, e.g., the Sierra Nevada batholith, are considered an early magmatic product (Bateman and Chappell, 1979;Noyes et al, 1983;Barnes, 1987;Ague and Brimhall, 1988), most magnetites in granites seem texturally to be the product of a late magmatic or subsolidus stage after 'alteration of iron-bearing silicates. Czamanske and Mih'hlik (1972) described magnetites from a late stage of ø Present address: Mineral Resources Department, Geological Survey of Japan.…”

Section: Granites (Senso Lato) One Of the Main Constituents Of The Cmentioning

confidence: 99%

Genesis of oxidized- and reduced-type granites

Takagi

Tsukimura²

1997

Economic Geology

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The genesis of oxidized-type (magnetite series) and reduced-type (ilmenite series) granites is discussed on the basis of thermodynamic considerations. We show that SO2 in the magma can oxidize augitc to form magnetite with decreasing temperature because the SO.•-H.•S buffer line intersects with the augitc-magnetitequartz buffer line on a 1/T -fo• diagram. When the magma contains SO.• above 250 ppm and the f% is constrained by the SO2-H.•S buffer, the magma forms oxidized-type granites (>0.2 modal % magnetite). On the other hand, •vhen the SO.• content is less than 250 ppm, the magma solidifies as a reduced-type granite (<0.2 modal % magnetite). If the f% of the magnaas is buffered by H.•O-H2, CO.•-CO, or (•H4-(•O2 no magnetite will crystallize and reduced-type granites will be formed. As a result, the genesis of oxidized-type and reduced-typ• granites can be attributed to the difference in volatile components in magnaas.

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A Tale of Two Plutons: Petrographic and Mineralogic Constraints on the Petrogenesis of the Red Lake and Eagle Peak Plutons, Central Sierra Nevada, California

Cited by 44 publications

References 35 publications

Geology, petrography and geochemistry of the A-type granites from the Morro Redondo Complex (PR-SC), southern Brazil, Graciosa Province

Geology, petrography and geochemistry of the A-type granites from the Morro Redondo Complex (PR-SC), southern Brazil, Graciosa Province

Biotite from Čierna hora Mountains granitoids (Western Carpathians, Slovakia) and estimation of water contents in granitoid melts

Genesis of oxidized- and reduced-type granites

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