SHRIMP zircon U-Pb evidence for extended Mesozoic magmatism in the Patagonian Batholith and assimilation of Archean crustal components

A.P. Rolando; L.A. Hartmann; J.O.S. Santos; R.R. Fernandez; R.O. Etcheverry; I.A. Schalamuk; Neal Mcnaughton

doi:10.1016/S0895-9811(02)00015-9

SHRIMP zircon U-Pb evidence for extended Mesozoic magmatism in the Patagonian Batholith and assimilation of Archean crustal components

A.P. Rolando, L.A. Hartmann, J.O.S. Santos, R.R. Fernandez, R.O. Etcheverry, I.A. Schalamuk, Neal Mcnaughton

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Abstract

The Patagonian Batholith forms the core of the southern Andes for about 1900 km. We investigated the ages of magmatic evolution of this major granitic batholith with SHRIMP, or sensitive high mass-resolution ion microprobe. Zircons from four samples were dated near 45degreesS along a profile from the core of the batholith in Chile to pre-Andean Patagonia in Argentina, yielding ages of 191 Ma +/- 3, 107 Ma +/- 2, 96.3 Ma +/- 1.3, and 81.7 Ma +/- 1.3. An unexpected result is the presence of Precambrian zircon xenocrysts in the pre-Andean batholith apophyses, concentrated near 3.40-3.00, 2.75-2.50, and 2.15-1.95 Ga. This demonstrates the presence of rocks derived from a Paleoproterozoic-Archean basement, which contaminated the gabbro and two granitoids. (C) 2002 Elsevier Science Ltd. All rights reserved.

Original language	English
Pages (from-to)	267-283
Journal	Journal of South American Earth Sciences
Volume	15
DOIs	https://doi.org/10.1016/S0895-9811(02)00015-9
Publication status	Published - 2002

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@article{ba17b32d9e204ac691113d8933606542,

title = "SHRIMP zircon U-Pb evidence for extended Mesozoic magmatism in the Patagonian Batholith and assimilation of Archean crustal components",

abstract = "The Patagonian Batholith forms the core of the southern Andes for about 1900 km. We investigated the ages of magmatic evolution of this major granitic batholith with SHRIMP, or sensitive high mass-resolution ion microprobe. Zircons from four samples were dated near 45degreesS along a profile from the core of the batholith in Chile to pre-Andean Patagonia in Argentina, yielding ages of 191 Ma +/- 3, 107 Ma +/- 2, 96.3 Ma +/- 1.3, and 81.7 Ma +/- 1.3. An unexpected result is the presence of Precambrian zircon xenocrysts in the pre-Andean batholith apophyses, concentrated near 3.40-3.00, 2.75-2.50, and 2.15-1.95 Ga. This demonstrates the presence of rocks derived from a Paleoproterozoic-Archean basement, which contaminated the gabbro and two granitoids. (C) 2002 Elsevier Science Ltd. All rights reserved.",

author = "A.P. Rolando and L.A. Hartmann and J.O.S. Santos and R.R. Fernandez and R.O. Etcheverry and I.A. Schalamuk and Neal Mcnaughton",

year = "2002",

doi = "10.1016/S0895-9811(02)00015-9",

language = "English",

volume = "15",

pages = "267--283",

journal = "Journal of South American Earth Sciences",

issn = "0895-9811",

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TY - JOUR

T1 - SHRIMP zircon U-Pb evidence for extended Mesozoic magmatism in the Patagonian Batholith and assimilation of Archean crustal components

AU - Rolando, A.P.

AU - Hartmann, L.A.

AU - Santos, J.O.S.

AU - Fernandez, R.R.

AU - Etcheverry, R.O.

AU - Schalamuk, I.A.

AU - Mcnaughton, Neal

PY - 2002

Y1 - 2002

N2 - The Patagonian Batholith forms the core of the southern Andes for about 1900 km. We investigated the ages of magmatic evolution of this major granitic batholith with SHRIMP, or sensitive high mass-resolution ion microprobe. Zircons from four samples were dated near 45degreesS along a profile from the core of the batholith in Chile to pre-Andean Patagonia in Argentina, yielding ages of 191 Ma +/- 3, 107 Ma +/- 2, 96.3 Ma +/- 1.3, and 81.7 Ma +/- 1.3. An unexpected result is the presence of Precambrian zircon xenocrysts in the pre-Andean batholith apophyses, concentrated near 3.40-3.00, 2.75-2.50, and 2.15-1.95 Ga. This demonstrates the presence of rocks derived from a Paleoproterozoic-Archean basement, which contaminated the gabbro and two granitoids. (C) 2002 Elsevier Science Ltd. All rights reserved.

AB - The Patagonian Batholith forms the core of the southern Andes for about 1900 km. We investigated the ages of magmatic evolution of this major granitic batholith with SHRIMP, or sensitive high mass-resolution ion microprobe. Zircons from four samples were dated near 45degreesS along a profile from the core of the batholith in Chile to pre-Andean Patagonia in Argentina, yielding ages of 191 Ma +/- 3, 107 Ma +/- 2, 96.3 Ma +/- 1.3, and 81.7 Ma +/- 1.3. An unexpected result is the presence of Precambrian zircon xenocrysts in the pre-Andean batholith apophyses, concentrated near 3.40-3.00, 2.75-2.50, and 2.15-1.95 Ga. This demonstrates the presence of rocks derived from a Paleoproterozoic-Archean basement, which contaminated the gabbro and two granitoids. (C) 2002 Elsevier Science Ltd. All rights reserved.

U2 - 10.1016/S0895-9811(02)00015-9

DO - 10.1016/S0895-9811(02)00015-9

M3 - Article

SN - 0895-9811

VL - 15

SP - 267

EP - 283

JO - Journal of South American Earth Sciences

JF - Journal of South American Earth Sciences

ER -

SHRIMP zircon U-Pb evidence for extended Mesozoic magmatism in the Patagonian Batholith and assimilation of Archean crustal components

Abstract

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