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Geodynamic implications of deep mantle upwelling in the source of Tertiary volcanics from the Veneto region (South-Eastern Alps)
Author(s)
Language
English
Obiettivo Specifico
3.3. Geodinamica e struttura dell'interno della Terra
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/36 (2003)
Publisher
Elsevier
Pages (printed)
563–590
Issued date
2003
Abstract
Major and trace element and Sr–Nd–Hf–Pb isotopic data for the most primitive Tertiary lavas from the
Veneto region (South-Eastern Alps, Italy) show the typical features of HIMU hotspot volcanism, variably
diluted by a depleted asthenospheric mantle component (87Sr/86Sri=0.70306–0.70378; "Ndi=+3.9 to
+6.8; "Hfi=+6.4 to +8.1, 206Pb/204Pbi=18.786–19.574). P-wave seismic tomography of the mantle below
the Veneto region shows the presence of low-velocity anomalies at depth, which is consistent with possible
upwellings of plume material. Between the depths of 100–250 km the velocity anomalies are approximately
2–2.5% slower than average, implying a temperature excess of about 220–280 K, in agreement with estimates
for other mantle plumes in the world. In this context, the Veneto volcanics may represent the shallow
expression of a mantle upflow. The presence of a HIMU-DM component in a collision environment
has significant geodynamic implications. Slab detachment and ensuing rise of deep mantle material into the
lithospheric gap is proposed to be a viable mechanism of hotspot magmatism in a subduction zone setting.
Veneto region (South-Eastern Alps, Italy) show the typical features of HIMU hotspot volcanism, variably
diluted by a depleted asthenospheric mantle component (87Sr/86Sri=0.70306–0.70378; "Ndi=+3.9 to
+6.8; "Hfi=+6.4 to +8.1, 206Pb/204Pbi=18.786–19.574). P-wave seismic tomography of the mantle below
the Veneto region shows the presence of low-velocity anomalies at depth, which is consistent with possible
upwellings of plume material. Between the depths of 100–250 km the velocity anomalies are approximately
2–2.5% slower than average, implying a temperature excess of about 220–280 K, in agreement with estimates
for other mantle plumes in the world. In this context, the Veneto volcanics may represent the shallow
expression of a mantle upflow. The presence of a HIMU-DM component in a collision environment
has significant geodynamic implications. Slab detachment and ensuing rise of deep mantle material into the
lithospheric gap is proposed to be a viable mechanism of hotspot magmatism in a subduction zone setting.
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It. Mineral. Petrol. 25, 27–34.
Chauvel, C., Blichert-Toft, J., 2001. A hafnium isotope and trace element perspective on melting of the depleted
mantle. Earth Planet. Sci. Lett. 190, 137–151.
Chauvel, C., Hofmann, A.W., Vidal, P., 1992. HIMU-EM: the French Polynesian connection. Earth Planet. Sci. Lett.
110, 99–119.
Clocchiatti, R., Del Moro, A., Gioncada, A., Joron, J.L., Mosbah, M., Pinarelli, L., Sbrana, A., 1994. Assessment of a
shallow magmatic system; the 1888-1890 eruption Volcano Island, Italy. Bull. Volcanol. 56, 466–486.
Dal Piaz, G.V., Del Moro, A., Martin, S., Venturelli, G., 1988. Post-collisional magmatism in the Ortler-Cevedale
massif (Northern Italy). Jb. Geol. B.-A. 131, 533–551.
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for episodes of volcanism due to lithospheric extension. Geochem.Geophys.Geosyst. 3.
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Franzini, M., Leoni, L., Saitta, M., 1975. Revisione di una metodologia analitica per fluorescenza-X, basata sulla
correzione completa degli effetti di matrice. Rend. Soc. It. Mineral. Petrol. 31, 365–378.
Gasperini, D., Blichert-Toft, J., Bosch, D., Del Moro, A., Macera, P., Albare` de, F., Te´ louk, P., 2000. Evidence form
Sardinian basalt geochemistry for recycling of plume heads into the Earth’s mantle. Nature 408, 701–704.
Gasperini, D., Blichert-Toft, J., Bosch, D., Del Moro, A., Macera, P., Albare` de, F., 2002. Upwelling of deep mantle
material into a plate window: evidence from the geochemistry of Italian basaltic volcanics. J. Geophys. Res. 107
(B12), 2367.
Gasperini, D., Maffei, K., Piromallo, C., Macera, P., Faccenna, C., Martin, S., Ranalli, G., 2003. Where is the tail of
European plume volcanism? In: EGS-AGU-EUG Joint Assembly, Nice (EAE 03-A-09744).
Goes, S., Spakman, W., Bijwaard, H., 1999. A lower mantle source for central European volcanism. Science 286, 1928–
1931.
Goes, S., Govers, R., Vacher, P., 2000. Shallow mantle temperatures under Europe from P and S wave tomography. J.
Geophys. Res. 105, 11153–11169.
Granet, M., Wilson, M., Achauer, U., 1995. Imaging a mantle plume beneath the Massif Central (France). Earth
Planet. Sci. Lett. 136, 281–296.
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