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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Zircon petrochronology and 40Ar/39Ar thermochronology of the Adamello Intrusive Suite, N. Italy: Monitoring the growth and decay of an incrementally assembled magmatic system
Journal of Petrology, Volume 60, No. 4, Year 2019
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Description
The Adamello intrusive suite is a composite batholith in Northern Italy, with an estimated 2000 km3 volume, assembled incrementally over a time span of 10 to 12 million years. The history of crystallization has been studied in detail through laser ablation ICP-MS and SIMS U-Pb geochronology of zircon, which records prolonged crystallization of each of the different intrusive units at mid-crustal levels between 43·47 and 33·16 Ma. The magmas were episodically extracted from this storage area and ascended to the final intrusion level at ∼6 km paleo-depth. Each batch of melt cooled very rapidly down to the ambient temperature of 250°C, evidenced by distinct cooling paths recorded by amphibole, biotite and K-feldspar 40Ar/39Ar dates. The magma source area was moving from SW to NE with time, causing increasing thermal maturity in the mid-crustal reservoir. The resulting temporal trend of higher degrees of crustal assimiliation in the course of the evolution of the magmatic system can be traced through Hf and O isotopes in zircon. Rough estimates of magma emplacement rates ('magma flux') yield very low values in the range of 10-4 km3/yr, typical of mid-to-upper crustal plutons and increase with time. Although we cannot discern a decrease of magma flux from our own data, we anticipate that a dramatic decrease of magma flux between 33 and 31 Ma along the northern contact lead to cessation of magma emplacement. © 2019 The Author(s). Published by Oxford University Press.
Authors & Co-Authors
Schaltegger, Urs
Switzerland, Geneva
Université de Genève
Nowak, Andres
Switzerland, Geneva
Université de Genève
Ulianov, Alexey
Switzerland, Lausanne
Université de Lausanne Unil
Gerdes, A. G.
Germany, Frankfurt am Main
Goethe-universität Frankfurt am Main
Spikings, Richard A.
Switzerland, Geneva
Université de Genève
Whitehouse, Martin J.
Sweden, Stockholm
Naturhistoriska Riksmuseet
Bindeman, I. N.
United States, Eugene
University of Oregon
Hanchar, John M.
Canada, St John's
Memorial University of Newfoundland
Caricchi, Luca
Switzerland, Geneva
Université de Genève
Statistics
Citations: 36
Authors: 9
Affiliations: 9
Identifiers
Doi:
10.1093/petrology/egz010
ISSN:
00223530