ORCID Profile
0000-0002-2000-416X
Current Organisation
Università degli Studi di Genova
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Publisher: Springer Science and Business Media LLC
Date: 17-09-2014
DOI: 10.1038/NCOMMS5923
Abstract: Large igneous province subduction is a rare process on Earth. A modern ex le is the subduction of the oceanic Hikurangi Plateau beneath the southern Kermadec arc, offshore New Zealand. This segment of the arc has the largest total lava volume erupted and the highest volcano density of the entire Kermadec arc. Here we show that Kermadec arc lavas south of ~32°S have elevated Pb and Sr and low Nd isotope ratios, which argues, together with increasing seafloor depth, forearc retreat and crustal thinning, for initial Hikurangi Plateau-Kermadec arc collision ~250 km north of its present position. The combined data set indicates that a much larger portion of the Hikurangi Plateau (the missing Ontong Java Nui piece) than previously believed has already been subducted. Oblique plate convergence caused southward migration of the thickened and buoyant oceanic plateau crust, creating a buoyant 'Hikurangi' mélange beneath the Moho that interacts with ascending arc melts.
Publisher: International Ocean Discovery Program
Date: 05-07-2019
Publisher: Oxford University Press (OUP)
Date: 07-2016
Publisher: Springer Science and Business Media LLC
Date: 27-05-2019
Publisher: Elsevier BV
Date: 03-2016
Publisher: International Ocean Discovery Program
Date: 05-07-2019
Publisher: International Ocean Discovery Program
Date: 05-07-2019
Publisher: Elsevier BV
Date: 08-2019
Publisher: Informa UK Limited
Date: 09-12-2020
Publisher: Geological Society of America
Date: 06-06-2019
DOI: 10.1130/G46047.1
Abstract: Hydrothermal systems hosted by submarine arc volcanoes commonly include a large component of magmatic fluid. The high Cu-Au contents and strongly acidic fluids in these systems are similar to those that formed in the shallow parts of some porphyry copper and epithermal gold deposits mined today on land. Two main types of hydrothermal systems occur along the submarine portion of the Kermadec arc (offshore New Zealand): magmatically influenced and seawater-dominated systems. Brothers volcano hosts both types. Here, we report results from a series of drill holes cored by the International Ocean Discovery Program into these two types of hydrothermal systems. We show that the extent of hydrothermal alteration of the host dacitic volcaniclastics and lavas reflects primary lithological porosity and contrasting spatial and temporal contributions of magmatic fluid, hydrothermal fluid, and seawater. We present a two-step model that links the changes in hydrothermal fluid regime to the evolution of the volcano caldera. Initial hydrothermal activity, prior to caldera formation, was dominated by magmatic gases and hypersaline brines. The former mixed with seawater as they ascended toward the seafloor, and the latter remained sequestered in the subsurface. Following caldera collapse, seawater infiltrated the volcano through fault-controlled permeability, interacted with wall rock and the segregated brines, and transported associated metals toward the seafloor and formed Cu-Zn-Au–rich chimneys on the caldera walls and rim, a process continuing to the present day. This two-step process may be common in submarine arc caldera volcanoes that host volcanogenic massive sulfide deposits, and it is particularly efficient at focusing mineralization at, or near, the seafloor.
Publisher: International Ocean Discovery Program
Date: 05-07-2019
Publisher: Elsevier BV
Date: 03-2016
Publisher: International Ocean Discovery Program
Date: 05-07-2019
Publisher: International Ocean Discovery Program
Date: 05-07-2019
Publisher: Elsevier BV
Date: 03-2016
Publisher: Society of Economic Geologists
Date: 23-11-2012
Publisher: Oxford University Press (OUP)
Date: 28-11-2019
DOI: 10.1093/GJI/GGZ536
Abstract: Quasigeoid models can be determined from surface gravity anomalies, so are sensitive to changes in the shape of the topography as well as changes in gravity. Here we present results of forward modelling gravity/quasigeoid changes from synthetic aperture radar data following the 2016 Mw 7.8 Kaikōura earthquake with land uplift of up to 10 m. We assess the impact of the topographic deformation on the reference surface of the New Zealand vertical datum in lieu of costly field gravity field measurements. The most significant modelled gravity and quasigeoid changes are—2.9 mGal and 5–7 mm, respectively. We compare our forward modelled gravity signal to terrestrial gravity observation data and show that differences between the data sets have a standard deviation of ±0.1 mGal. The largest modelled change in the quasigeoid is an order of magnitude smaller than the 57.7 mm estimated precision of the most recently computed NZGeoid model over the Kaikōura region. Modelled quasigeoid changes implied by this particular deformation event are not statistically significant with respect to estimated precision of the New Zealand quasigeoid model.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-01-2018
Abstract: A submersible study of the products of a large submarine eruption demonstrates the influence of the ocean on eruption dynamics.
Publisher: American Geophysical Union (AGU)
Date: 24-06-2016
DOI: 10.1002/2016GL069430
Publisher: International Ocean Discovery Program
Date: 05-07-2019
No related grants have been discovered for Fabio Caratori Tontini.