Fluorite particles inducing butterfly aggregates of incipient microperthite in alkali feldspar from a syenite, the Patagonian Andes, southern Chile

Satoshi Nakano; Junji Akai; Asahiko Sugaki

doi:10.2138/am-2002-1013

Fluorite particles inducing butterfly aggregates of incipient microperthite in alkali feldspar from a syenite, the Patagonian Andes, southern Chile

American Mineralogist ◽

10.2138/am-2002-1013 ◽

2002 ◽

Vol 87 (10) ◽

pp. 1377-1383 ◽

Cited By ~ 15

Author(s):

Satoshi Nakano ◽

Junji Akai ◽

Asahiko Sugaki

Keyword(s):

Alkali Feldspar ◽

Southern Chile ◽

Patagonian Andes

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Mesozoic-Cenozoic denudation history of the Patagonian Andes (southern Chile) and its correlation to different subduction processes

Tectonics ◽

10.1029/2001tc900013 ◽

2001 ◽

Vol 20 (5) ◽

pp. 693-711 ◽

Cited By ~ 90

Author(s):

Stuart N. Thomson ◽

Francisco Hervé ◽

Bernhard Stöckhert

Keyword(s):

Southern Chile ◽

History Of ◽

Patagonian Andes

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Late Oligocene–early Miocene submarine volcanism and deep-marine sedimentation in an extensional basin of southern Chile: Implications for the tectonic development of the North Patagonian Andes

Geological Society of America Bulletin ◽

10.1130/b31303.1 ◽

2015 ◽

Vol 128 (5-6) ◽

pp. 807-823 ◽

Cited By ~ 23

Author(s):

Alfonso Encinas ◽

Andrés Folguera ◽

Verónica Oliveros ◽

Lizet De Girolamo Del Mauro ◽

Francisca Tapia ◽

...

Keyword(s):

Early Miocene ◽

Late Oligocene ◽

Southern Chile ◽

Submarine Volcanism ◽

Extensional Basin ◽

The North ◽

Marine Sedimentation ◽

Tectonic Development ◽

Patagonian Andes

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Sedimentology and Dispersal pattern of a Cretaceous Flysch Sequence, Patagonian Andes, Southern Chile

AAPG Bulletin ◽

10.1306/a663389e-16c0-11d7-8645000102c1865d ◽

1966 ◽

Vol 50 ◽

Author(s):

Kevin M. Scott (2)

Keyword(s):

Southern Chile ◽

Dispersal Pattern ◽

Patagonian Andes

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Contrasting Fe-Ca distributions and related microtextures in syenite alkali feldspar from the Patagonian Andes, Chile

Mineralogical Magazine ◽

10.1180/0026461056940268 ◽

2005 ◽

Vol 69 (4) ◽

pp. 521-535 ◽

Cited By ~ 22

Author(s):

Satoshi Nakano ◽

J. Akai ◽

N. Shimobayashi

Keyword(s):

Spatial Distribution ◽

Large Scale ◽

Microprobe Analysis ◽

Electron Microprobe Analysis ◽

Bulk Composition ◽

Alkali Feldspar ◽

Distribution Patterns ◽

Quartz Syenite ◽

Multi Stage ◽

Patagonian Andes

AbstractContrasting distribution patterns of Fe and Ca have been found by electron microprobe analysis (EMPA) mapping of alkali feldspar in a quartz syenite from the Patagonian Andes, Chile. They comprise mainly mantle zoning (Fe-rich, Ca-poor rims and Fe-poor, Ca-rich interiors) and corresponding patchy zoning in grain interiors. The rims are dominantly of turbid, patch microperthites associated with abundant micropores, but there remain clear, optically featureless regions almost free of micropores. The interiors are intricate mixtures of optically clear, featureless regions, and turbid, patch microperthite regions. The clear, featureless regions (Or31 –47) are of remaining exsolution lamellar cryptoperthites. The zoning patterns of Fe and Ca formed by large-scale transport over the feldspar grain during the high-temperature fluid stage. They have been modified by successive transport of Fe and Ca during the later hydrothermal development of patch microperthites and finally by K-feldspathization and albitization. Cathodoluminescence images correspond to the spatial distribution patterns of Fe overprinted by these multi-stage reactions. The original composition of the alkali feldspar before the subsolidus reactions is estimated to have been ~Or34Ab65An1, and the present bulk composition after the reactions is Or40Ab59An0.5.

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