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Abstract:

Middle Devonian granitoids intruded the Eastern Sierras Pampeanas basement ca. 600 km east of the inferred proto-Pacific margin of Gondwana along which a ca. 390 Ma collisional event developed. In the Sierra de San Luis, voluminous Middle Devonian (393–382 Ma) batholiths are composed of I- to A-type hybrid Monzonite and Granite suites. Shoshonite and subordinated high-K series, stocks, synplutonic dikes and enclaves make up the Monzonite Suite; rocks are metaluminous alkali–calcic magnesian porphyritic or equigranular monzonite, quartz monzonite, monzodiorite and scarce monzogabbro. High-K and subordinated shoshonite series metaluminous to mildly peraluminous magnesian alkali–calcic to calc–alkalic porphyritic or equigranular quartz monzonite, granodiorite, monzogranite and equigranular leucomonzogranites make up the Granite Suite plutons and batholiths. Only a small group of highly evolved granites are ferroan. SiO 2 (46–62%), Cr, Ni, V, Sc, LILE, LREE, Th, Zr and variable, Sr/Y, (La/Yb) N and (Tb/Yb) N, smooth Eu/Eu*, moderate Na 2 O (ca 3.5), and troughs at Nb and Ta for Monzonite Suite rocks suggest an subduction-related enriched lithospheric mantle source. Sm–Nd data (T DM 0.98–1.08 Ga, εNd (380 Ma) 0.66–1.47) and 87 Sr/ 86 Sr i (0.703520–0.704203) are compatible with an enriched mantle source. The metaluminous porphyritic quartz monzonite–monzogranite and the mildly peraluminous equigranular biotite monzogranites of the Granite Suite are characterized by relatively moderate Al 2 O 3 , CaO, and 87 Sr/ 86 Sr i , high LILE, Cr, variable Sr/Y, (La/Yb) N and Eu/Eu* and low Rb/Sr (< 1.2) suggest a mafic source. The porphyritic monzogranite (T DM 1.20–1.28 Ga, εNd (380Ma) − 3.02 to − 3.3, 87 Sr/ 86 Sr i 0.706578–0.707027) and the biotite monzogranites (T DM 1.31 Ga, εNd (380Ma) − 3.3, 87 Sr/ 86 Sr i 0.707782) would share a common source. The equigranular alkali–calcic leucomonzogranites are characterized by Rb/Sr > 1.5, ASI 1.05–1.18, and Ga/Al 2.6–3.9, εNd (380 Ma) − 3.74 to − 3.95 and ( 87 Sr/ 86 Sr) i 0.710743–0.712955 which would point to metasedimentary or felsic igneous crustal sources. Nevertheless their T DM 1.36–1.38 Ga is considerably younger than the mean 1.8–1.6 Ga Eastern Sierras Pampeanas crustal residence age and less radiogenic. Middle Devonian magmatism would record an episode of crustal growth by enriched mantle derived magma input and variable degrees of partial melting of a lower crustal source at the waning stages of the Achalian orogeny. © 2017 Elsevier B.V.

Registro:

Documento: Artículo
Título:Petrogenesis of the postcollisional Middle Devonian monzonitic to granitic magmatism of the Sierra de San Luis, Argentina
Autor:López de Luchi, M.G.; Siegesmund, S.; Wemmer, K.; Nolte, N.
Filiación:Instituto de Geocronología y Geología Isotópica (INGEIS), CONICET-UBA, Facultad de Ciencias Exactas y Naturales, Intendente Güiraldes 2160, Ciudad UniversitariaC1428EGA, Argentina
Geoscience Centre of the Georg-August University, Göttingen (GZG), Goldschmidtstr. 3, Göttingen, 37077, Germany
Palabras clave:Argentina; Middle Devonian; Petrogenesis monzonite and granite suites; Postcollisional magmatism; Sierra de San Luis; Sierras Pampeanas; batholith; Devonian; Gondwana; granitoid; magmatism; monzonite; orogeny; partial melting; petrogenesis; pluton; Argentina; San Luis; Sierra de San Luis [Sierras Pampeanas]; Sierras Pampeanas
Año:2017
Volumen:288-289
Página de inicio:191
Página de fin:213
DOI: http://dx.doi.org/10.1016/j.lithos.2017.05.018
Título revista:Lithos
Título revista abreviado:Lithos
ISSN:00244937
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244937_v288-289_n_p191_LopezdeLuchi

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Citas:

---------- APA ----------
López de Luchi, M.G., Siegesmund, S., Wemmer, K. & Nolte, N. (2017) . Petrogenesis of the postcollisional Middle Devonian monzonitic to granitic magmatism of the Sierra de San Luis, Argentina. Lithos, 288-289, 191-213.
http://dx.doi.org/10.1016/j.lithos.2017.05.018
---------- CHICAGO ----------
López de Luchi, M.G., Siegesmund, S., Wemmer, K., Nolte, N. "Petrogenesis of the postcollisional Middle Devonian monzonitic to granitic magmatism of the Sierra de San Luis, Argentina" . Lithos 288-289 (2017) : 191-213.
http://dx.doi.org/10.1016/j.lithos.2017.05.018
---------- MLA ----------
López de Luchi, M.G., Siegesmund, S., Wemmer, K., Nolte, N. "Petrogenesis of the postcollisional Middle Devonian monzonitic to granitic magmatism of the Sierra de San Luis, Argentina" . Lithos, vol. 288-289, 2017, pp. 191-213.
http://dx.doi.org/10.1016/j.lithos.2017.05.018
---------- VANCOUVER ----------
López de Luchi, M.G., Siegesmund, S., Wemmer, K., Nolte, N. Petrogenesis of the postcollisional Middle Devonian monzonitic to granitic magmatism of the Sierra de San Luis, Argentina. Lithos. 2017;288-289:191-213.
http://dx.doi.org/10.1016/j.lithos.2017.05.018