Geocronología U-Pb e isótopos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile

Katja Deckart; Francisco Hervé; C. Mark Fanning; Valeria Ramírez; Mauricio Calderón; Estanislao Godoy

doi:10.5027/andgeoV41n1-a03

Geocronología U-Pb e isótopos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile

Translated title of the contribution: U-Pb geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile

Katja Deckart, Francisco Hervé, C. Mark Fanning, Valeria Ramírez, Mauricio Calderón, Estanislao Godoy

Engineering School

Research output: Contribution to journal › Article › peer-review

63 Citations (Scopus)

Abstract

The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed of calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over a distance of 800 km yielded ages between 300 and 320 Ma, Pennsylvanian (late Carboniferous). Lu-Hf isotopic analyses on the same zircon grains have initial εHf_(i) values from +1.67 to -5.64. The δ¹⁸O ratios for that grains range from 6.4 to 8.6‰. These new isotopic data point to a relative homogeneous source with prominent components of the continental crust. The calculated Mesoproterozoic Depleted Mantel model ages, in addition to the short span of intrusive ages give insights to the position of the proto-Gondwana margin and the changing subduction mechanism at the end of late Paleozoic time.

Translated title of the contribution	U-Pb geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile
Original language	Spanish
Pages (from-to)	49-82
Number of pages	34
Journal	Andean Geology
Volume	41
Issue number	1
DOIs	https://doi.org/10.5027/andgeoV41n1-a03
Publication status	Published - 2014

ASJC Scopus subject areas

Geology
Geochemistry and Petrology
Stratigraphy
Palaeontology

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10.5027/andgeoV41n1-a03

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title = "Geocronolog{\'i}a U-Pb e is{\'o}topos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile",

abstract = "The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed of calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over a distance of 800 km yielded ages between 300 and 320 Ma, Pennsylvanian (late Carboniferous). Lu-Hf isotopic analyses on the same zircon grains have initial εHf(i) values from +1.67 to -5.64. The δ18O ratios for that grains range from 6.4 to 8.6‰. These new isotopic data point to a relative homogeneous source with prominent components of the continental crust. The calculated Mesoproterozoic Depleted Mantel model ages, in addition to the short span of intrusive ages give insights to the position of the proto-Gondwana margin and the changing subduction mechanism at the end of late Paleozoic time.",

keywords = "Coastal Batholith, Lu-Hf and O isotope geochemistry, Pennsylvanian, U-Pb, Zircons",

author = "Katja Deckart and Francisco Herv{\'e} and Fanning, {C. Mark} and Valeria Ram{\'i}rez and Mauricio Calder{\'o}n and Estanislao Godoy",

year = "2014",

doi = "10.5027/andgeoV41n1-a03",

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AU - Deckart, Katja

AU - Hervé, Francisco

AU - Fanning, C. Mark

AU - Ramírez, Valeria

AU - Calderón, Mauricio

AU - Godoy, Estanislao

PY - 2014

Y1 - 2014

N2 - The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed of calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over a distance of 800 km yielded ages between 300 and 320 Ma, Pennsylvanian (late Carboniferous). Lu-Hf isotopic analyses on the same zircon grains have initial εHf(i) values from +1.67 to -5.64. The δ18O ratios for that grains range from 6.4 to 8.6‰. These new isotopic data point to a relative homogeneous source with prominent components of the continental crust. The calculated Mesoproterozoic Depleted Mantel model ages, in addition to the short span of intrusive ages give insights to the position of the proto-Gondwana margin and the changing subduction mechanism at the end of late Paleozoic time.

AB - The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed of calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over a distance of 800 km yielded ages between 300 and 320 Ma, Pennsylvanian (late Carboniferous). Lu-Hf isotopic analyses on the same zircon grains have initial εHf(i) values from +1.67 to -5.64. The δ18O ratios for that grains range from 6.4 to 8.6‰. These new isotopic data point to a relative homogeneous source with prominent components of the continental crust. The calculated Mesoproterozoic Depleted Mantel model ages, in addition to the short span of intrusive ages give insights to the position of the proto-Gondwana margin and the changing subduction mechanism at the end of late Paleozoic time.

KW - Coastal Batholith

KW - Lu-Hf and O isotope geochemistry

KW - Pennsylvanian

KW - U-Pb

KW - Zircons

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U2 - 10.5027/andgeoV41n1-a03

DO - 10.5027/andgeoV41n1-a03

M3 - Artículo

AN - SCOPUS:84897585505

SN - 0718-7092

VL - 41

SP - 49

EP - 82

JO - Andean Geology

JF - Andean Geology

IS - 1

ER -

Geocronología U-Pb e isótopos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile

Abstract

ASJC Scopus subject areas

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