SHRIMP dating of zircons in eclogite from the Variscan basement in north-eastern Sardinia (Italy)

Rosaria Palmeri; Mark Fanning; Marcello Franceschelli; Isabella Memmi; Carlo Alberto Ricci

doi:10.1127/0028-3649/2004/2004-0275

SHRIMP dating of zircons in eclogite from the Variscan basement in north-eastern Sardinia (Italy)

Rosaria Palmeri^*, Mark Fanning, Marcello Franceschelli, Isabella Memmi, Carlo Alberto Ricci

^*Corresponding author for this work

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

58 Citations (Scopus)

Abstract

SHRIMP (Sensitive High-Resolution Ion Microprobe) U-Pb ages of zircons from a single sample of mafic eclogite (Punta de li Tulchi, Sardinia, Italy) are reported. The study under cathodoluminescence (CL) reveals two groups of metamorphic zircons and the SHRIMP analyses allow recognition of three ages: 1) 453 ± 14 Ma; 2) 400 ± 10 Ma, and 3) 327 ± 7 Ma. The age of 453 ± 14 Ma could be that of the magmatic protolith and an age of 327 ± 7 Ma can reasonably be attributed to the main Variscan collisional event in Sardinia, which produced Barrovian-type metamorphism, and retrogression of eclogite under amphibolite-facies metamorphism. The intermediate age 400 ± 10 Ma is difficult to interpret and it could represent either the age of the eclogite facies metamorphism or it is a result of Pb-loss during the main Variscan event at 327 ± 7 Ma.

Original language	English
Pages (from-to)	275-288
Number of pages	14
Journal	Neues Jahrbuch Fur Mineralogie, Monatshefte
Issue number	6
DOIs	https://doi.org/10.1127/0028-3649/2004/2004-0275
Publication status	Published - Jun 2004

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@article{b3b7d4630a934b608a90e0410709ec7e,

title = "SHRIMP dating of zircons in eclogite from the Variscan basement in north-eastern Sardinia (Italy)",

abstract = "SHRIMP (Sensitive High-Resolution Ion Microprobe) U-Pb ages of zircons from a single sample of mafic eclogite (Punta de li Tulchi, Sardinia, Italy) are reported. The study under cathodoluminescence (CL) reveals two groups of metamorphic zircons and the SHRIMP analyses allow recognition of three ages: 1) 453 ± 14 Ma; 2) 400 ± 10 Ma, and 3) 327 ± 7 Ma. The age of 453 ± 14 Ma could be that of the magmatic protolith and an age of 327 ± 7 Ma can reasonably be attributed to the main Variscan collisional event in Sardinia, which produced Barrovian-type metamorphism, and retrogression of eclogite under amphibolite-facies metamorphism. The intermediate age 400 ± 10 Ma is difficult to interpret and it could represent either the age of the eclogite facies metamorphism or it is a result of Pb-loss during the main Variscan event at 327 ± 7 Ma.",

keywords = "Eclogite, SHRIMP II U - Pb dating, Sardinia, Variscan orogeny, Zircon",

author = "Rosaria Palmeri and Mark Fanning and Marcello Franceschelli and Isabella Memmi and Ricci, {Carlo Alberto}",

year = "2004",

month = jun,

doi = "10.1127/0028-3649/2004/2004-0275",

language = "English",

pages = "275--288",

journal = "Neues Jahrbuch Fur Mineralogie, Monatshefte",

issn = "0028-3649",

publisher = "Schweizerbart Science Publishers",

number = "6",

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TY - JOUR

T1 - SHRIMP dating of zircons in eclogite from the Variscan basement in north-eastern Sardinia (Italy)

AU - Palmeri, Rosaria

AU - Fanning, Mark

AU - Franceschelli, Marcello

AU - Memmi, Isabella

AU - Ricci, Carlo Alberto

PY - 2004/6

Y1 - 2004/6

N2 - SHRIMP (Sensitive High-Resolution Ion Microprobe) U-Pb ages of zircons from a single sample of mafic eclogite (Punta de li Tulchi, Sardinia, Italy) are reported. The study under cathodoluminescence (CL) reveals two groups of metamorphic zircons and the SHRIMP analyses allow recognition of three ages: 1) 453 ± 14 Ma; 2) 400 ± 10 Ma, and 3) 327 ± 7 Ma. The age of 453 ± 14 Ma could be that of the magmatic protolith and an age of 327 ± 7 Ma can reasonably be attributed to the main Variscan collisional event in Sardinia, which produced Barrovian-type metamorphism, and retrogression of eclogite under amphibolite-facies metamorphism. The intermediate age 400 ± 10 Ma is difficult to interpret and it could represent either the age of the eclogite facies metamorphism or it is a result of Pb-loss during the main Variscan event at 327 ± 7 Ma.

AB - SHRIMP (Sensitive High-Resolution Ion Microprobe) U-Pb ages of zircons from a single sample of mafic eclogite (Punta de li Tulchi, Sardinia, Italy) are reported. The study under cathodoluminescence (CL) reveals two groups of metamorphic zircons and the SHRIMP analyses allow recognition of three ages: 1) 453 ± 14 Ma; 2) 400 ± 10 Ma, and 3) 327 ± 7 Ma. The age of 453 ± 14 Ma could be that of the magmatic protolith and an age of 327 ± 7 Ma can reasonably be attributed to the main Variscan collisional event in Sardinia, which produced Barrovian-type metamorphism, and retrogression of eclogite under amphibolite-facies metamorphism. The intermediate age 400 ± 10 Ma is difficult to interpret and it could represent either the age of the eclogite facies metamorphism or it is a result of Pb-loss during the main Variscan event at 327 ± 7 Ma.

KW - Eclogite

KW - SHRIMP II U - Pb dating

KW - Sardinia

KW - Variscan orogeny

KW - Zircon

UR - http://www.scopus.com/inward/record.url?scp=3042778518&partnerID=8YFLogxK

U2 - 10.1127/0028-3649/2004/2004-0275

DO - 10.1127/0028-3649/2004/2004-0275

M3 - Article

SN - 0028-3649

SP - 275

EP - 288

JO - Neues Jahrbuch Fur Mineralogie, Monatshefte

JF - Neues Jahrbuch Fur Mineralogie, Monatshefte

IS - 6

ER -

SHRIMP dating of zircons in eclogite from the Variscan basement in north-eastern Sardinia (Italy)

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