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Abstract:

Devonian magmatism in the Eastern Sierras Pampeanas (Córdoba, Argentina) is represented by elliptical, porphyritic, batholithic, late- to post-orogenic monzogranites emplaced in a metamorphic-plutonic basement. Two groups of Devonian granitoids are distinguished: (1) metaaluminous to weakly peraluminous, hornblende-biotite bearing granitoids, and (2) peraluminous, biotite-(muscovite) bearing granitoids. Groups 1 and 2 are characterized by accessory phases of sphene-magnetite with high susceptibility, and ilmenite-(monazite-uraninite) with low susceptibility, respectively. The magnetic assemblage of the Group 2 Achala Batholith, predominantly paramagnetic, is the subject of this paper Forty-three sites were sampled in the Achala monzogranite. Overall, it is weakly magnetic, with a mean magnetic susceptibility of 1.5 × 10 -4 SI. Twenty-one sites showed titanohaematite as the magnetic carrier of a stable remanence. The titanohaematite is an accessory mineral and contains exsolved disc-shaped intergrowths of ilmenite. The weak magnetism of Achala monzogranite facies contrasts with the magnetic character of other Devonian porphyritic, batholithic monzogranites in the region. The virtual absence of magnetite, together with the presence of exsolved titanohaematite and Mn-ilmenite indicate crystallization and cooling under more oxidizing conditions. Oxidizing conditions continued into the subsolidus, causing late-stage reactions of ilmenite host grains to ilmenite + rutile+ haematite, and titanohaematite to ilmenite-poorer haematite + rutile. These reactions resulted in low susceptibility values and a strong reduction of natural remanent magnetization (NRM) intensities. Thermal demagnetization, up to 620-640°C, isolated steeply dipping, dual-polarity remanence directions. The coincidence of the Achala paleomagnetic pole with the 380-360 Myr segment of the Gondwana Apparent Polar Wander Path and the U-Pb zircon age implies that the remanence was acquired soon after emplacement. © 2008 The Authors Journal compilation © 2008 RAS.

Registro:

Documento: Artículo
Título:Magnetic petrology of the Devonian Achala Batholith, Argentina: Titanohaematite as an indicator of highly oxidized magma during crystallization and cooling
Autor:Geuna, S.E.; Mcenroe, S.A.; Robinson, P.; Escosteguy, L.D.
Filiación:Instituto de Geofísica 'Daniel Valencio' (INGEODAV), Facultad de CienciasExactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Beunos Aires, Argentina
Geological Survey of Norway, Trondheim, Norway
Servicio Geológico Minero Argentino (SEGEMAR), Buenos Aires, Argentina
Palabras clave:Magnetic Mineralogy and Petrology; Physics and chemistry of magma bodies; Rockand mineral magnetism; South America; basement rock; batholith; cooling; crystallization; Devonian; magma chemistry; magmatism; magnetic method; magnetic susceptibility; mineralogy; petrology; titanomagnetite; Argentina; Sierras Pampeanas; South America
Año:2008
Volumen:175
Número:3
Página de inicio:925
Página de fin:941
DOI: http://dx.doi.org/10.1111/j.1365-246X.2008.03964.x
Título revista:Geophysical Journal International
Título revista abreviado:Geophys. J. Int.
ISSN:0956540X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0956540X_v175_n3_p925_Geuna

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Citas:

---------- APA ----------
Geuna, S.E., Mcenroe, S.A., Robinson, P. & Escosteguy, L.D. (2008) . Magnetic petrology of the Devonian Achala Batholith, Argentina: Titanohaematite as an indicator of highly oxidized magma during crystallization and cooling. Geophysical Journal International, 175(3), 925-941.
http://dx.doi.org/10.1111/j.1365-246X.2008.03964.x
---------- CHICAGO ----------
Geuna, S.E., Mcenroe, S.A., Robinson, P., Escosteguy, L.D. "Magnetic petrology of the Devonian Achala Batholith, Argentina: Titanohaematite as an indicator of highly oxidized magma during crystallization and cooling" . Geophysical Journal International 175, no. 3 (2008) : 925-941.
http://dx.doi.org/10.1111/j.1365-246X.2008.03964.x
---------- MLA ----------
Geuna, S.E., Mcenroe, S.A., Robinson, P., Escosteguy, L.D. "Magnetic petrology of the Devonian Achala Batholith, Argentina: Titanohaematite as an indicator of highly oxidized magma during crystallization and cooling" . Geophysical Journal International, vol. 175, no. 3, 2008, pp. 925-941.
http://dx.doi.org/10.1111/j.1365-246X.2008.03964.x
---------- VANCOUVER ----------
Geuna, S.E., Mcenroe, S.A., Robinson, P., Escosteguy, L.D. Magnetic petrology of the Devonian Achala Batholith, Argentina: Titanohaematite as an indicator of highly oxidized magma during crystallization and cooling. Geophys. J. Int. 2008;175(3):925-941.
http://dx.doi.org/10.1111/j.1365-246X.2008.03964.x