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Magnetic petrology of variably retrogressed eclogites and amphibolites: A case study from the Hercynian basement of northern Sardinia (Italy)
Language
English
Status
Published
Peer review journal
Yes
Title of the book
Issue/vol(year)
/111 (2006)
Publisher
Agu
Pages (printed)
B12S26
Issued date
2006
Abstract
The silicate parageneses of variably retrogressed eclogites
are extensively used by metamorphic petrologists to
reconstruct the tectonometamorphic evolution of ophiolitesbearing
units and high-pressure continental tectonic slices
in orogenic belts from initial burial to exhumation. On the
other hand, the opaque mineralogy of these rocks is
generally not studied in detail although the characterization
of Fe-Ti oxides and sulphides in metabasites has a great
potential [Clark, 1997; Dunlop and O¨ zdemir, 1997; Frost,
1991b] to better understand the processes controlling the
formation and stability of magnetic minerals (mainly magnetite
and pyrrhotite) in subduction zones and collisional
orogens and to improve geological interpretation of magnetic
survey data.
[3] The Hercynian basement of northern Sardinia provides
a case study to define the relationships between
metamorphic evolution and magnetic properties of eclogite
and amphibolite facies metabasites in a number of structurally
and petrologically well-studied outcrops within a
representative crustal section of the southern European
Variscan belt.
[4] To characterize the magnetic properties of these rocks,
we conducted a series of minero-petrographical analyses
and mineral magnetic measurements on a suite of samples
representative of all the main mafic/ultramafic lenses of the
region. In this study, we report on new data and interpretations
which are essential (1) to characterize and to verify
primary and secondary oxide contributions to the overall
magnetization, (2) to link the stability/instability of magnetic
assemblages to specific metamorphic stages, and (3) to
provide a preliminary regional-scale perspective on the level
of magnetization in all the main metamorphic mafic rock
units of the Hercynian orogenic belt in northern Sardinia.
are extensively used by metamorphic petrologists to
reconstruct the tectonometamorphic evolution of ophiolitesbearing
units and high-pressure continental tectonic slices
in orogenic belts from initial burial to exhumation. On the
other hand, the opaque mineralogy of these rocks is
generally not studied in detail although the characterization
of Fe-Ti oxides and sulphides in metabasites has a great
potential [Clark, 1997; Dunlop and O¨ zdemir, 1997; Frost,
1991b] to better understand the processes controlling the
formation and stability of magnetic minerals (mainly magnetite
and pyrrhotite) in subduction zones and collisional
orogens and to improve geological interpretation of magnetic
survey data.
[3] The Hercynian basement of northern Sardinia provides
a case study to define the relationships between
metamorphic evolution and magnetic properties of eclogite
and amphibolite facies metabasites in a number of structurally
and petrologically well-studied outcrops within a
representative crustal section of the southern European
Variscan belt.
[4] To characterize the magnetic properties of these rocks,
we conducted a series of minero-petrographical analyses
and mineral magnetic measurements on a suite of samples
representative of all the main mafic/ultramafic lenses of the
region. In this study, we report on new data and interpretations
which are essential (1) to characterize and to verify
primary and secondary oxide contributions to the overall
magnetization, (2) to link the stability/instability of magnetic
assemblages to specific metamorphic stages, and (3) to
provide a preliminary regional-scale perspective on the level
of magnetization in all the main metamorphic mafic rock
units of the Hercynian orogenic belt in northern Sardinia.
References
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Anomaly, Geol. Soc. Am. Bull., 86, 683–694.
Arthaud, F., and P. Matte (1977), De´termination de la position initiale de la
Corse et de la Sardaigne a` la fin de l’orogenese` hercynienne grace aux
marqueurs ge´ologiques ante´me´sozoiques, Bull. Soc. Geol. Fr., 19(4),
833–840.
Barton, P. B. (1970), Sulfide petrology, in Sulfide Minerals, Rev. Mineral.,
vol. 1, edited by P. H. Ribbe, 11 pp. Mineral. Soc. of Am., Washington,
D. C.
Brown, E. H. (1977), The crossite content of Ca-amphibole as a guide to
pressure of metamorphism, J. Petrol., 18, 53– 72.
Brown, J. L., D. J. Ellis, R. Arculus, and A. Christy (2005), Sulfide metamorphism
in blueschist and eclogite, north-eastern New Caledonia, Eos
Trans. AGU, 86(52), Fall Meet. Suppl., Abstract V13E-0586.
Buddington, A. W., and D. H. Lindsley (1964), Iron-titanium oxide thermometry
oxide minerals and synthetic equivalents, J. Petrol., 5, 310–357.
Cappelli, B., L. Carmignani, F. Castorina, A. Di Pisa, G. Oggiano, and
R. Petrini (1992), A Hercynian suture zone in Sardinia: Geological and
geochemical evidence, Geodin. Acta, 5, 1–2, 101– 118.
Carmignani, L., and P. Rossi (1999), Carta geologica e strutturale della
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Carmignani, L., B. Cappelli, S. Barca, A. Di Pisa, G. Oggiano, and P. C.
Pertusati (1992), A tentative geodynamic model of for the Hercynian
basement of northern Sardinia, in Contribution to the Geology of Italy,
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Carosi, R., and R. Palmeri (2002), Orogen-parallel tectonic transport in the
Variscan belt of northeastern Sardinia (Italy): Implications for the exhumation
of medium-pressure metamorphic rocks, Geol. Mag., 139(5),
497–511, doi:10.1017/S0016756802006763.
Cassano, E., A. Marcello, R. Nannini, S. Pretti, G. Ranieri, R. Salvadori,
and I. Salvadori (1979), Rilievo aeromagnetico della Sardegna e del mare
circostante, Ente Miner. Sardo, 3–4, 7– 30.
Castorina, F., G. Cesaraccio, A. Di Pisa, and G. Oggiano (1996), The
amphibolitic stratified complex of Punta Scorno (Asinara Island, Sardinia,
Italy): Petrogenesis and tectonic interpretation, Plinius, 16, 74– 76.
Clark, D. A. (1997), Magnetic petrophysics and magnetic petrology: Aids
to geological interpretation of magnetic surveys, J. Aust. Geol. Geophys.,
17(2), 83– 103.
Cortesogno, L., L. Gaggero, G. Oggiano, and J. L. Paquette (2004), Different
tectono-thermal evolutionary paths in eclogitic rocks from the axial
zone of the Variscan chain in Sardinia (Italy) compared with the Ligurian
Alps, Ofioliti, 29, 125– 144.
Cruciani, G., M. Franceschelli, and S. Jungs (2003), Zircon morphology
and Pb-Pb dating of amphibolite bearing migmatite from the Variscan
chain of NE Sardinia, Italy, paper presented at FIST Geoitalia 2003,
Assoc. Ital. di Geol. Appl. e Ambientale, Bellaria, Italy.
Day, R., M. D. Fuller, and V. A. Schmidt (1977), Hysteresis properties of
titanomagnetite: Grain size and composition dependence, Phys. Earth
Planet. Inter., 13, 260–267.
De Boer, J., and F. G. Snider (1979), Magnetic and chemical variations of
Mesozoic diabase dikes from eastern North America: Evidence for a
hotspot in the Carolinas?, Geol. Soc. Am. Bull., 90, 185– 198.
Di Vincenzo, G., F. M. Elter, C. Ghezzo, R. Palmeri, and C. A. Ricci
(1994), Petrological evolution of the Palaeozoic basement of Sardinia,
in Petrology, Geology and Ore Deposits of the Palaeozoic Basement of
Sardinia, Guide-Book to the Field Excursion B3, edited by L. Carmignani
et al., pp. 21– 36, Int. Mineral. Assoc., Pisa, Italy.
Dunlop, D. J., and O¨ . O¨ zdemir (1997), Rock Magnetism: Fundamentals
and Frontiers, 573 pp., Cambridge Univ. Press, New York.
Elter, F. M., M. Franceschelli, C. Ghezzo, I. Memmi, and C. A. Ricci
(1986), The geology of northern Sardinia, in Guide Book to the Excursion
on the Paleozoic Basement of Sardinia, IGCP Project 5 Newsletter,
special issue, edited by L. Carmignani et al., pp. 87– 102, casa ed. Pasini,
Pisa, Italy.
Ferrara, G., C. A. Ricci, and F. Rita (1978), Isotopic ages and tectonometamorphic
history of the metamorphic basement of north-eastern Sardinia,
Contrib. Mineral. Petrol., 68, 1 –18.
Franceschelli, M., I. Memmi, and C. A. Ricci (1982), Ca distribution
between almandine -rich garnet and plagioclase in pelitic and psammitc
schists from the metamorphic basement of north-eastern Sardinia,
Contrib. Mineral. Petrol., 80, 285– 295.
Franceschelli, M., I. Turbanti Memmi, A. Eltrudis, R. Palmeri, and
G. Carcangiu (1998), Multi-stage metamorphic re-equilibration in eclogitic
rocks from the Hercynian basement of NE Sardinia (Italy), Mineral.
Petrol., 62, 3–4.
Franceschelli, M., G. Carcangiu, A. M. Caredda, G. Cruciani, I. Memmi,
and M. Zucca (2002), Transformation of cumulate mafic rocks to granulite
and re-equilibration in amphibolite and greenschist facies in NE
Sardinia, Italy, Lithos, 63, 1– 18.
Frost, B. R. (1991a), Magnetic petrology: Factors that control the occurrence
of magnetite in crustal rocks, in Oxide Minerals: Petrologic and
Magnetic Significance, Rev. Mineral., vol. 25, edited by D. H. Lindsley,
pp. 489– 506, Mineral. Soc. of Am., Washington, D. C.
Frost, B. R. (1991b), Stability of oxide minerals in metamorphic rocks, in
Oxide Minerals: Petrologic and Magnetic Significance, Rev. Mineral.,
vol. 25, edited by D. H. Lindsley, pp. 469– 488, Mineral. Soc. of Am.,
Washington, D. C.
Frost, B. R., and D. H. Lindsley (1991), Occurrence of Iron-Titanium
oxides in igneous rocks, in Oxide Minerals: Petrologic and Magnetic
Significance, Rev. Mineral., vol. 25, edited by D. H. Lindsley, pp.
433– 468, Mineral. Soc. of Am., Washington, D. C.
Gattacceca, J., J.-B. Orsini, J.-P. Bellot, B. Henry, P. Rochette, P. Rossi, and
G. Cherchi (2004), Magnetic fabric of granitoids from southern Corsica
and northern Sardinia and implications for Late Hercynian tectonic setting,
J. Geol. Soc. London, 161, 277–289.
Ghezzo, C., I. Memmi, and C. A. Ricci (1979), Un evento granulitico nel
basamento ercinico della Sardegna nord orientale, Mem. Soc. Geol. Ital.,
20, 23– 38.
Giacomini, F., R. M. Bomparola, and C. Ghezzo (2005), Petrology and
geochronology of metabsites with eclogite facies relics from NE Sardinia:
Constraints for the Paleozoic evolution of southern Europe, Lithos, 82,
221– 248.
Harlov, D., P. Tropper, W. Seifert, T. Nijland, and H. J. Forster (2005), The
role of fH2O and fO2 on the formation of Al-rich Titanite rimes
on Ilmenite in amphibolite facies metamorphic rocks: Constraints
from equilibria among clinopyroxene-amphibole-magnetite-ilmenitequartz
involving CaTiSiO4 and CaAlSiO4OH, Geophys. Res. Abstr., 7,
03960.
Helbing, H. (2003), No suture in the Sardinian Variscides: A structural,
petrological, and geochronological analysis, Ph.D. thesis, 190 pp.,
Tu¨binger Geowiss. Arb., Tu¨bingen, Germany.
Holland, T. J. B., and S. W. Richardson (1979), Amphibole zonation in
metabasites as a guide to the evolution of metamorphic conditions, Contrib.
Mineral. Petrol., 70, 143– 148.
Kretz, R. (1983), Symbols for rock forming minerals, Am. Mineral., 68,
277– 279.
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subcommittee on amphiboles of the International Mineralogical Association,
commission on new minerals and mineral names, Can. Mineral., 35,
219– 246.
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Planet. Inter., 115, 191– 204.
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Galapagos Spreading Center and their relation to the Galapagos Melting
Anomaly, Geol. Soc. Am. Bull., 86, 683–694.
Arthaud, F., and P. Matte (1977), De´termination de la position initiale de la
Corse et de la Sardaigne a` la fin de l’orogenese` hercynienne grace aux
marqueurs ge´ologiques ante´me´sozoiques, Bull. Soc. Geol. Fr., 19(4),
833–840.
Barton, P. B. (1970), Sulfide petrology, in Sulfide Minerals, Rev. Mineral.,
vol. 1, edited by P. H. Ribbe, 11 pp. Mineral. Soc. of Am., Washington,
D. C.
Brown, E. H. (1977), The crossite content of Ca-amphibole as a guide to
pressure of metamorphism, J. Petrol., 18, 53– 72.
Brown, J. L., D. J. Ellis, R. Arculus, and A. Christy (2005), Sulfide metamorphism
in blueschist and eclogite, north-eastern New Caledonia, Eos
Trans. AGU, 86(52), Fall Meet. Suppl., Abstract V13E-0586.
Buddington, A. W., and D. H. Lindsley (1964), Iron-titanium oxide thermometry
oxide minerals and synthetic equivalents, J. Petrol., 5, 310–357.
Cappelli, B., L. Carmignani, F. Castorina, A. Di Pisa, G. Oggiano, and
R. Petrini (1992), A Hercynian suture zone in Sardinia: Geological and
geochemical evidence, Geodin. Acta, 5, 1–2, 101– 118.
Carmignani, L., and P. Rossi (1999), Carta geologica e strutturale della
Sardegna e della Corsica, scale 1:500,000, Ist. Poligr. e Zecca dello Stato
S.p.A., Rome.
Carmignani, L., B. Cappelli, S. Barca, A. Di Pisa, G. Oggiano, and P. C.
Pertusati (1992), A tentative geodynamic model of for the Hercynian
basement of northern Sardinia, in Contribution to the Geology of Italy,
IGCP 276, Newsl. 5, edited by L. Carmignani and F. P. Sassi, pp. 61– 83,
Int. Geol. Correl. Programme, Siena, Italy.
Carmignani, L., R. Carosi, A. Di Pisa, M. Gattiglio, G. Musumeci,
G. Oggiano, and P. C. Pertusati (1994), The Hercynian chain in Sardinia
(Italy), Geodin. Acta, 7, 31–47.
Carosi, R., and R. Palmeri (2002), Orogen-parallel tectonic transport in the
Variscan belt of northeastern Sardinia (Italy): Implications for the exhumation
of medium-pressure metamorphic rocks, Geol. Mag., 139(5),
497–511, doi:10.1017/S0016756802006763.
Cassano, E., A. Marcello, R. Nannini, S. Pretti, G. Ranieri, R. Salvadori,
and I. Salvadori (1979), Rilievo aeromagnetico della Sardegna e del mare
circostante, Ente Miner. Sardo, 3–4, 7– 30.
Castorina, F., G. Cesaraccio, A. Di Pisa, and G. Oggiano (1996), The
amphibolitic stratified complex of Punta Scorno (Asinara Island, Sardinia,
Italy): Petrogenesis and tectonic interpretation, Plinius, 16, 74– 76.
Clark, D. A. (1997), Magnetic petrophysics and magnetic petrology: Aids
to geological interpretation of magnetic surveys, J. Aust. Geol. Geophys.,
17(2), 83– 103.
Cortesogno, L., L. Gaggero, G. Oggiano, and J. L. Paquette (2004), Different
tectono-thermal evolutionary paths in eclogitic rocks from the axial
zone of the Variscan chain in Sardinia (Italy) compared with the Ligurian
Alps, Ofioliti, 29, 125– 144.
Cruciani, G., M. Franceschelli, and S. Jungs (2003), Zircon morphology
and Pb-Pb dating of amphibolite bearing migmatite from the Variscan
chain of NE Sardinia, Italy, paper presented at FIST Geoitalia 2003,
Assoc. Ital. di Geol. Appl. e Ambientale, Bellaria, Italy.
Day, R., M. D. Fuller, and V. A. Schmidt (1977), Hysteresis properties of
titanomagnetite: Grain size and composition dependence, Phys. Earth
Planet. Inter., 13, 260–267.
De Boer, J., and F. G. Snider (1979), Magnetic and chemical variations of
Mesozoic diabase dikes from eastern North America: Evidence for a
hotspot in the Carolinas?, Geol. Soc. Am. Bull., 90, 185– 198.
Di Vincenzo, G., F. M. Elter, C. Ghezzo, R. Palmeri, and C. A. Ricci
(1994), Petrological evolution of the Palaeozoic basement of Sardinia,
in Petrology, Geology and Ore Deposits of the Palaeozoic Basement of
Sardinia, Guide-Book to the Field Excursion B3, edited by L. Carmignani
et al., pp. 21– 36, Int. Mineral. Assoc., Pisa, Italy.
Dunlop, D. J., and O¨ . O¨ zdemir (1997), Rock Magnetism: Fundamentals
and Frontiers, 573 pp., Cambridge Univ. Press, New York.
Elter, F. M., M. Franceschelli, C. Ghezzo, I. Memmi, and C. A. Ricci
(1986), The geology of northern Sardinia, in Guide Book to the Excursion
on the Paleozoic Basement of Sardinia, IGCP Project 5 Newsletter,
special issue, edited by L. Carmignani et al., pp. 87– 102, casa ed. Pasini,
Pisa, Italy.
Ferrara, G., C. A. Ricci, and F. Rita (1978), Isotopic ages and tectonometamorphic
history of the metamorphic basement of north-eastern Sardinia,
Contrib. Mineral. Petrol., 68, 1 –18.
Franceschelli, M., I. Memmi, and C. A. Ricci (1982), Ca distribution
between almandine -rich garnet and plagioclase in pelitic and psammitc
schists from the metamorphic basement of north-eastern Sardinia,
Contrib. Mineral. Petrol., 80, 285– 295.
Franceschelli, M., I. Turbanti Memmi, A. Eltrudis, R. Palmeri, and
G. Carcangiu (1998), Multi-stage metamorphic re-equilibration in eclogitic
rocks from the Hercynian basement of NE Sardinia (Italy), Mineral.
Petrol., 62, 3–4.
Franceschelli, M., G. Carcangiu, A. M. Caredda, G. Cruciani, I. Memmi,
and M. Zucca (2002), Transformation of cumulate mafic rocks to granulite
and re-equilibration in amphibolite and greenschist facies in NE
Sardinia, Italy, Lithos, 63, 1– 18.
Frost, B. R. (1991a), Magnetic petrology: Factors that control the occurrence
of magnetite in crustal rocks, in Oxide Minerals: Petrologic and
Magnetic Significance, Rev. Mineral., vol. 25, edited by D. H. Lindsley,
pp. 489– 506, Mineral. Soc. of Am., Washington, D. C.
Frost, B. R. (1991b), Stability of oxide minerals in metamorphic rocks, in
Oxide Minerals: Petrologic and Magnetic Significance, Rev. Mineral.,
vol. 25, edited by D. H. Lindsley, pp. 469– 488, Mineral. Soc. of Am.,
Washington, D. C.
Frost, B. R., and D. H. Lindsley (1991), Occurrence of Iron-Titanium
oxides in igneous rocks, in Oxide Minerals: Petrologic and Magnetic
Significance, Rev. Mineral., vol. 25, edited by D. H. Lindsley, pp.
433– 468, Mineral. Soc. of Am., Washington, D. C.
Gattacceca, J., J.-B. Orsini, J.-P. Bellot, B. Henry, P. Rochette, P. Rossi, and
G. Cherchi (2004), Magnetic fabric of granitoids from southern Corsica
and northern Sardinia and implications for Late Hercynian tectonic setting,
J. Geol. Soc. London, 161, 277–289.
Ghezzo, C., I. Memmi, and C. A. Ricci (1979), Un evento granulitico nel
basamento ercinico della Sardegna nord orientale, Mem. Soc. Geol. Ital.,
20, 23– 38.
Giacomini, F., R. M. Bomparola, and C. Ghezzo (2005), Petrology and
geochronology of metabsites with eclogite facies relics from NE Sardinia:
Constraints for the Paleozoic evolution of southern Europe, Lithos, 82,
221– 248.
Harlov, D., P. Tropper, W. Seifert, T. Nijland, and H. J. Forster (2005), The
role of fH2O and fO2 on the formation of Al-rich Titanite rimes
on Ilmenite in amphibolite facies metamorphic rocks: Constraints
from equilibria among clinopyroxene-amphibole-magnetite-ilmenitequartz
involving CaTiSiO4 and CaAlSiO4OH, Geophys. Res. Abstr., 7,
03960.
Helbing, H. (2003), No suture in the Sardinian Variscides: A structural,
petrological, and geochronological analysis, Ph.D. thesis, 190 pp.,
Tu¨binger Geowiss. Arb., Tu¨bingen, Germany.
Holland, T. J. B., and S. W. Richardson (1979), Amphibole zonation in
metabasites as a guide to the evolution of metamorphic conditions, Contrib.
Mineral. Petrol., 70, 143– 148.
Kretz, R. (1983), Symbols for rock forming minerals, Am. Mineral., 68,
277– 279.
Leake, B. E., et al. (1997), Nomenclature of amphiboles: Report of the
subcommittee on amphiboles of the International Mineralogical Association,
commission on new minerals and mineral names, Can. Mineral., 35,
219– 246.
Lecoanet, H., F. Leveque, and S. Segura (1999), Magnetic susceptibility in
environmental applications: Comparison of field probes, Phys. Earth
Planet. Inter., 115, 191– 204.
McEnroe, S. A., P. Robinson, and P. T. Panish (2001), Aeromagnetic
anomalies, magnetic petrology, and rock magnetism of hemo-ilmeniteand
magnetite-rich cumulate rocks from the Sokndal Region, South
Rogaland, Norway, Am. Mineral., 86, 1447– 1468.
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