Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps: 1. The Miagliano Pluton

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Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps : 1. The Miagliano Pluton. / Berger, Alfons; Thomsen, Tonny B.; Ovtcharova, Maria; Kapferer, Notburga; Mercolli, Ivan.

I: Swiss Journal of Geosciences (Print Edition), Bind 105, Nr. 1, 2012, s. 49-65.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Harvard

Berger, A, Thomsen, TB, Ovtcharova, M, Kapferer, N & Mercolli, I 2012, 'Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps: 1. The Miagliano Pluton', Swiss Journal of Geosciences (Print Edition), bind 105, nr. 1, s. 49-65. https://doi.org/10.1007/s00015-012-0091-7

APA

Berger, A., Thomsen, T. B., Ovtcharova, M., Kapferer, N., & Mercolli, I. (2012). Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps: 1. The Miagliano Pluton. Swiss Journal of Geosciences (Print Edition), 105(1), 49-65. https://doi.org/10.1007/s00015-012-0091-7

Vancouver

Berger A, Thomsen TB, Ovtcharova M, Kapferer N, Mercolli I. Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps: 1. The Miagliano Pluton. Swiss Journal of Geosciences (Print Edition). 2012;105(1):49-65. https://doi.org/10.1007/s00015-012-0091-7

Author

Berger, Alfons ; Thomsen, Tonny B. ; Ovtcharova, Maria ; Kapferer, Notburga ; Mercolli, Ivan. / Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps : 1. The Miagliano Pluton. I: Swiss Journal of Geosciences (Print Edition). 2012 ; Bind 105, Nr. 1. s. 49-65.

Bibtex

@article{e8d3a1b51168415a8bc30cdcce8d0736,
title = "Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps: 1. The Miagliano Pluton",
abstract = "The Canavese Line in the Western Alps represents the position in the Alpine chain, where alkaline and calc-alkaline magmatism occur in close spatial and temporal association. In addition to available data on the alkaline Valle del Cervo Pluton, we present petrological and geochemical data on the Miagliano tonalite. The latter is of special interest, because it is located in the south-eastern side of the Canavese Line, in contrast to most Periadriatic Plutons. The dioritic to tonalitic rocks of the Miagliano Pluton represent an intermediate stage of a calc-alkaline differentiation, demonstrated by relics of two different pyroxenes as well as the texture of allanite. Hornblende barometry indicates pressures of similar to 0.46 GPa consistent with the presence of magmatic epidote. Field relationships between the two Plutons, the volcanic and volcaniclastic rocks of the Biella Volcanic Suite and numerous dykes cross-cutting the different units, allow reconstruction of a more refined chronology of the calc-alkaline and alkaline magmatic series. High precision zircon geochronology yields an age of 33.00 +/- A 0.04 Ma for the central tonalitic part of the Miagliano Pluton and 30.39 +/- A 0.50 Ma for the granitic core of the Valle del Cervo Pluton. The difference in age combined with cooling data and intrusion depth indicates dissimilar tectonic transport east and west of the Canavese Line. The earlier emplaced Miagliano Pluton has to be exhumed from an intrusion depth of similar to 12-15 km, whereas the neighbouring and younger Valle del Cervo Pluton is exhumed from a depth of 5-7 km. This tectonic scenario is related to upper crustal rigid block rotation responsible for the burial of the lowermost Rupelian paleosurface of the Sesia-Lanzo Zone. Thus, the new ages constrain the paroxysm of the orogenic magmatism in the internal Western Alps to an extremely short lapse of time in the first half of the Rupelian.",
author = "Alfons Berger and Thomsen, {Tonny B.} and Maria Ovtcharova and Notburga Kapferer and Ivan Mercolli",
year = "2012",
doi = "10.1007/s00015-012-0091-7",
language = "English",
volume = "105",
pages = "49--65",
journal = "Swiss Journal of Geosciences",
issn = "1661-8726",
publisher = "Springer Basel AG",
number = "1",

}

RIS

TY - JOUR

T1 - Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps

T2 - 1. The Miagliano Pluton

AU - Berger, Alfons

AU - Thomsen, Tonny B.

AU - Ovtcharova, Maria

AU - Kapferer, Notburga

AU - Mercolli, Ivan

PY - 2012

Y1 - 2012

N2 - The Canavese Line in the Western Alps represents the position in the Alpine chain, where alkaline and calc-alkaline magmatism occur in close spatial and temporal association. In addition to available data on the alkaline Valle del Cervo Pluton, we present petrological and geochemical data on the Miagliano tonalite. The latter is of special interest, because it is located in the south-eastern side of the Canavese Line, in contrast to most Periadriatic Plutons. The dioritic to tonalitic rocks of the Miagliano Pluton represent an intermediate stage of a calc-alkaline differentiation, demonstrated by relics of two different pyroxenes as well as the texture of allanite. Hornblende barometry indicates pressures of similar to 0.46 GPa consistent with the presence of magmatic epidote. Field relationships between the two Plutons, the volcanic and volcaniclastic rocks of the Biella Volcanic Suite and numerous dykes cross-cutting the different units, allow reconstruction of a more refined chronology of the calc-alkaline and alkaline magmatic series. High precision zircon geochronology yields an age of 33.00 +/- A 0.04 Ma for the central tonalitic part of the Miagliano Pluton and 30.39 +/- A 0.50 Ma for the granitic core of the Valle del Cervo Pluton. The difference in age combined with cooling data and intrusion depth indicates dissimilar tectonic transport east and west of the Canavese Line. The earlier emplaced Miagliano Pluton has to be exhumed from an intrusion depth of similar to 12-15 km, whereas the neighbouring and younger Valle del Cervo Pluton is exhumed from a depth of 5-7 km. This tectonic scenario is related to upper crustal rigid block rotation responsible for the burial of the lowermost Rupelian paleosurface of the Sesia-Lanzo Zone. Thus, the new ages constrain the paroxysm of the orogenic magmatism in the internal Western Alps to an extremely short lapse of time in the first half of the Rupelian.

AB - The Canavese Line in the Western Alps represents the position in the Alpine chain, where alkaline and calc-alkaline magmatism occur in close spatial and temporal association. In addition to available data on the alkaline Valle del Cervo Pluton, we present petrological and geochemical data on the Miagliano tonalite. The latter is of special interest, because it is located in the south-eastern side of the Canavese Line, in contrast to most Periadriatic Plutons. The dioritic to tonalitic rocks of the Miagliano Pluton represent an intermediate stage of a calc-alkaline differentiation, demonstrated by relics of two different pyroxenes as well as the texture of allanite. Hornblende barometry indicates pressures of similar to 0.46 GPa consistent with the presence of magmatic epidote. Field relationships between the two Plutons, the volcanic and volcaniclastic rocks of the Biella Volcanic Suite and numerous dykes cross-cutting the different units, allow reconstruction of a more refined chronology of the calc-alkaline and alkaline magmatic series. High precision zircon geochronology yields an age of 33.00 +/- A 0.04 Ma for the central tonalitic part of the Miagliano Pluton and 30.39 +/- A 0.50 Ma for the granitic core of the Valle del Cervo Pluton. The difference in age combined with cooling data and intrusion depth indicates dissimilar tectonic transport east and west of the Canavese Line. The earlier emplaced Miagliano Pluton has to be exhumed from an intrusion depth of similar to 12-15 km, whereas the neighbouring and younger Valle del Cervo Pluton is exhumed from a depth of 5-7 km. This tectonic scenario is related to upper crustal rigid block rotation responsible for the burial of the lowermost Rupelian paleosurface of the Sesia-Lanzo Zone. Thus, the new ages constrain the paroxysm of the orogenic magmatism in the internal Western Alps to an extremely short lapse of time in the first half of the Rupelian.

U2 - 10.1007/s00015-012-0091-7

DO - 10.1007/s00015-012-0091-7

M3 - Journal article

VL - 105

SP - 49

EP - 65

JO - Swiss Journal of Geosciences

JF - Swiss Journal of Geosciences

SN - 1661-8726

IS - 1

ER -

ID: 35464199