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RU Pavia

 

 

Research unit of Pavia


Aims

The RU of Pavia will focus the research activity on the magmatic products and the large scale deformation within the lower continental crust linked at passive margins during large magmatic events. Recent works suggest that one of the most well exposed lower crustal section of the word the so called Ivrea-Verbano Zone (western Alps, Italy) recorded both magmatic events (e.g. Denyszyn et al., 2016) and high-temperature mylonitic deformation (e.g. Langone et al., 2018) at lower crustal levels at the Triassic-Jurassic boundary. This period corresponds with with the Central Atlantic Magmatic Province (CAMP). In this period, different lower crustal lithologies of the IVZ recorded anomalous high thermal gradients promoting total or partial isotopic resetting in accessory minerals (e.g. Ewing et al., 2015; Zanetti et al., 2016; Langone et al., 2017). High temperature lower crustal shear zones have been largely documented within the IVZ but only a few precise geochronological data are available. These shear zone mainly developed within mafic rocks and the previous attempts to date them were hampered by the techniques available more than 20 years ago. There are several evidences that these lower crustal shear zones had a major role during the Triassic-Jurassic boundary, coevally with the CAMP formation. The RU will study the shear zones with the major aim of characterize the timing of deformation in the continental crust during the opening of the North Atlantic margin. The timing will be constrained by coupling different geochronological techniques (Ar-Ar; U-Th-Pb) providing information on the Temperature-Time (T-t) history followed by the rocks. For the sheared rocks the geochronological approach will be to date minerals directly on thin section in order to preserve the textural control of the data. Before geochronoogical analyses the rocks and minerals will be characterized from the microstructural point of view by acquiring Electron Back Scattered Diffraction analyses. These analyses analyses are fundamental in case of rocks/minerals that experienced crystal-plastic deformation since it can dramatically change both the chemistry and the isotopic composition of minerals (fractionation e.g. Piazolo et al., 2017 and references therein). A possible influence of the CAMP on the lower continental crust of the IVZ is also documented by magmatic bodies dispersed along the lower crustal levels. The emplacement of these magmatic bodies were accommodated by lower crustal extension and represent the precursors of other younger magmatic products ranging in composition from carbonatite (e.g. Galli et al., 2017) to alkaline (Schaltegger et al., 2015) to transitional (Mazzucchelli et al., 2010), with mafic sills and pipe-like bodies that contain Ni-Cu-PGE sulfide mineralisation (e.g. Denyszyn et al., 2016). The aim of the RU will be the characterization of these magmatic events that have been discovered only recently. The RU will focus also on the petrogenesis of these lower crustal bodies. The RU unit has decades of experienced on in situ microanalytical techniques (SIMS; LAICPMS) allowing both the geochemical and geochronological characterization of magmatic and metamorphic rocks. Therefore, the RU can collaborate with the other RUs for in situ geochemical and geochronological applications.

 

People

 

Collaborators

2020-2021

Post-doc specifically dedicated to the project

 

 

Facilities/skills of the RU

Two members of the RU manage two microanalytical laboratories: a Laser-Ablation Inductively-Coupled- Plasma Mass-Spectrometry (LA-ICP-MS) and a Secondary Ion Mass Spectrometry (SIMS). Both laboratories are largely used for volatiles, trace and ultra-trace element determinations in mineral phases and geochronology of U-bearing accessory minerals. The LA-ICP-MS laboratory is equipped with two laser sources: a Nd-YAG 213nm laser source (RESEARCH WAVE) and an Excimer 193 laser source (GEOLAS). These laser sources are combined with two mass spectrometers, a triple quadrupole (8900 Agilent QQQ) a single quadrupole (DRCe from PERKIN ELMER) and a double focusing magnetic sector field (ELEMENT I from THERMO FINNIGAN). The SIMS lab is equipped with Cameca IMS 4f.

Results/publications/abstract


1. Corvò S., Maino M., Piazolo S., Seno S., Langone A. (2022). Role of inherited compositional and structural heterogeneity in shear zone development at mid-low levels of the continental

crust (the Anzola shear zone; Ivrea-Verbano Zone, Southern Alps). Lithos, 106745.

2. Simonetti M., Langone A., Corvò S., Bonazzi M. - Triassic-Jurassic rift-related deformation and Temperature-time evolution of the fossil adriatic margin: a review from Ossola and Strona di Omegna valleys (Ivrea-Verbano Zone). Ofioliti, 2021, 46 (2), 151-165 - doi: 10.4454/ofioliti.v46i2.544

3. Bonazzi, M., Langone, A., Dellarole, E., Mazzucchelli, M., Giovanardi, T., Zanetti A., 2020 - Mantle derived corundum-bearing leucocratic dykes may survive only within the lower (refractory/inert) crust: evidence from zircon geochemistry and geochronology (Ivrea-Verbano Zone, Southern Alps). Geosciences 2020, 10, 281; doi:10.3390/geosciences100802

4. Corvò, S., Langone A., Padròn-Navarta J.A.; Tommasi A., Zanetti A. 2020. Porphyroclasts: Source and Sink of Major and Trace Elements During Deformation-Induced Metasomatism (Finero, Ivrea-Verbano Zone, Italy). Geosciences 2020, 10, 196; doi:10.3390/geosciences10050196.

 

ABSTRACTS

I. Langone A., Corvò S., Maino M., Piazolo S. - Relict But Not Inert: The Geochemical Variations Of Garnet Porphyroclasts During Deformation. 3rd European Mineralogical Conference - Abstract number 0274

II. Langone A., Simonetti M., Corvò S., Maino M., Bonazzi M. - Accessory Minerals From Mid-Lower Crustal Shear Zone: A Unique Opportunity To Date Deformation (Val Strona Di Omegna, Ivrea-Verbano Zone, Italy) 3rd European Mineralogical Conference - Abstract number 0276

III. Corvò S., Maino M., Langone A., Bonazzi M., Simonetti M., Schenker F.L., Casini L., Piazolo S., Seno S.- A multidisciplinary approach to unravel the rocks heterogeneities: link between deformation and metamorphic processes from lithospheric crust. BeGeoscientists 2021.

IV. Corvò S., Maino M., Langone A., Piazolo S.- Microstructural and petrological characterization of a major extensional shear zone in the middle crust (Val d’Ossola, Ivrea-Verbano Zone, Western Alps). 90° Congresso della Società Geologica Italiana 2021.

V. Corvò, S., Langone, A., Maino, M., Piazolo, S., Kylander-Clark A. R.C.- Titanite as powerful petrochronometer for unravelling the evolution of a major extensional shear zone in the middle crust (Val d’Ossola, Ivrea-Verbano Zone, Western Alps). 3rd European Mineralogical Conference 2020.

VI. Corvò S., Langone A., Maino M., and Piazolo S.- Evolution of a major extensional shear zone in the middle crust (Val d’Ossola, Ivrea-Verbano Zone, Western Alps). Waiting for Yorsget 2021.

VII. Corvò, S., Langone, A., Maino, M., Piazolo, S., and Seno, S.- Unravelling the evolution of a major extensional lower crust shear zone from Val d’Ossola (Ivrea-Verbano Zone, Western Alps, Italy). Metamorphic Studies Group 40th anniversary Meeting 2021.

VIII. Corvò, S., Maino, M., Langone, A., Piazolo, S., - Timing and deformation features of shear zones at different crustal levels (Val d’Ossola, Ivrea-Verbano Zone, Western Alps). International School entitled “Structure and Composition of the Lower Continental Crust 2019.

IX. Simonetti M., Langone A., Corvò S., Bonazzi M., Maino M., - Rift-related deformation in the lower continental crust: new insights form the multidisciplinary study of the Forno-Rosarolo shear zone (Ivrea-Verbano Zone, Western Alps). 90° Congresso della Società Geologica Italiana 2021.

X. Bonazzi M., Langone A., Tumiati S., Dellarole E., M. Mazzucchelli, Giovanardi T., Zanetti A. -Corundum-rich dykes constraining Triassic alkalne magmatism in the Ivrea-Verbano Zone (Southern Alps): a zircon approach. EGU general Assembly 2021 April 19-30, Gather Online.

XI. Bonazzi M. Langone A., Nazzari M., - Titanite from metacarbonate: a powerful petrological and geochronological tool (Valle Strona di Omegna; Ivrea-Verbano Zone, Italy). 3rd European Mineralogical Conference - Abstract number 0336.

XII. Bonazzi M., Langone A., Corvò S., Nazzari M., - Titanite from metacarbonates: a (unique) petrological and geochronological tool, an example from the Valle Strona di Omegna (Ivrea-Verbano Zone, Western Alps, Italy). 90° Congresso della Società Geologica Italiana 2021.

XIII. Bonazzi M., Langone A., Corvò S., Nazzari M., - Titanate: an indicator of Temperature-time evolution in the calc-silicate rocks. An example from the Valle Strona (Ivrea-Verbano Zone, Western Alps, Italy). BeGeoscientists 2021.

XIV. Corvò S., Maino M., Piazolo S., Seno S., Langone A. Role of fluids and inherited compositional and structural heterogeneities in shear zone development at mid-low crustal levels: from meso- to micro-scale structural and petrological investigations SGI-SIMP societies - Geosciences for a sustainable future (19-21/09/2022)

XV. Corvò S., Maino M., Piazolo S., Seno S., Langone A. Dating Triassic-Jurassic rift-related deformation through microstructural and petrochronological analyses: insights on the evolution of a middle

continental crustal shear zone (Ivrea-Verbano Zone, Italian Southern Alps) SGI-SIMP societies - Geosciences for a sustainable future (19-21/09/2022)

XVI -  Corvò S., Maino M., Piazolo S., Seno S., Langone - Multiscale lithological and structural heterogeneity control on the nucleation of a crustal shear zone: petro- structural investigation and U-Pb titanite dating from the Anzola shear zone (Ivrea-Verbano Zone, Southern Alps) 15th Emile Argand Conference on Alpine Geological Studies (12-14/09/2022)