Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3541
Authors: Macera, P.* 
Gasperini, D.* 
Piromallo, C.* 
Blichert-Toft, J.* 
Bosch, D.* 
Del Moro, A.* 
Martin, S.* 
Title: Geodynamic implications of deep mantle upwelling in the source of Tertiary volcanics from the Veneto region (South-Eastern Alps)
Journal: Journal of Geodynamics 
Series/Report no.: /36 (2003)
Publisher: Elsevier
Issue Date: 2003
DOI: 10.1016/j.jog.2003.08.004
Keywords: trace-element
isotopic composition
alkali basalts
central-Europe
slab break-off
plume
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
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.
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat Existing users please Login
Macera_etal_JG_2003.pdfMain article1.09 MBAdobe PDF
Show full item record

WEB OF SCIENCETM
Citations 10

49
checked on Feb 10, 2021

Page view(s) 50

220
checked on May 18, 2024

Download(s)

23
checked on May 18, 2024

Google ScholarTM

Check

Altmetric