Samuele Papeschi

Samuele Papeschi
Japan Agency for Marine-Earth Science Technology | JAMSTEC · Kochi Institute for Core Sample Research

PhD
JAMSTEC Young research fellow, working on the geological record of earthquakes and associated deformation.

About

44
Publications
14,284
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115
Citations
Introduction
Researcher in structural geology, metamorphic processes, rock deformation, & tectonics. Visit https://spapeschi.weebly.com/ for more details about my research Feel free to contact me about everything!
Additional affiliations
March 2019 - March 2020
Università di Pisa
Position
  • Researcher
Description
  • Fixed-term contract on the analysis of the structure of Eastern Elba Island
January 2018 - April 2018
Universität Stuttgart
Position
  • PhD Student
October 2017 - October 2018
Università di Pisa
Position
  • Research Assistant
Description
  • Teaching assistant for the course of "Geologia I" (Geology I) under the supervision of prof. Caterina Morigi. Geology I is the basic course held at the 1st year of the bachelor's degree in Earth Sciences in Pisa.
Education
November 2015 - January 2019
University of Florence
Field of study
  • Geosciences
December 2012 - April 2015
Università di Pisa
Field of study
  • Earth Sciences
October 2009 - December 2012
Università di Pisa
Field of study
  • Earth Sciences

Publications

Publications (44)
Article
Full-text available
We document an exhumed subduction plate boundary shear zone – a subduction channel – developed at the contact between a fossil Cretaceous – Eocene accretionary prism (Ligurian Units) and the underlying continent-derived nappes of the Northern Apennines. The subduction channel, here referred to as the Norsi – Cavo Complex (NCC), is continuously expo...
Article
Full-text available
Magmatic and high-to low-temperature sub-solidus fabrics in intrusive rocks are frequently used to infer the relative timing of deformation with respect to magma emplacement and cooling. Here we describe the relationships between strain and fabric development in leucogranite sheets (pegmatite, aplite) emplaced into shear zones that localized post-p...
Preprint
Full-text available
The hinterland of the Cenozoic Northern Apennines fold-and-thrust belt exposes the metamorphic roots of the chain, vestiges of the subduction-related tectono-metamorphic evolution that led to the buildup of the Alpine orogeny in the Mediterranean region. Like in other peri-Mediterranean belts, the tectono-metamorphic evolution of the Paleozoic cont...
Article
Full-text available
The hinterland of the Cenozoic Northern Apennines fold-and-thrust belt exposes the metamorphic roots of the chain, vestiges of the subduction-related tectono-metamorphic evolution that led to the buildup of the Alpine orogeny in the Mediterranean region. Like in other peri-Mediterranean belts, the tectono-metamorphic evolution of the Paleozoic cont...
Preprint
Full-text available
In their paper, Spiess et al. (2021) published structural, geochronological, and EBSD data on one of the monzogranite apophyses (Capo Bianco) of the buried Porto Azzurro Pluton (island of Elba, Northern Apennines, Italy), a pluton emplaced in the upper crust (P < 0.2 GPa; e.g. Papeschi et al., 2019). The authors publish a new U/Pb age of 6.4 ± 0.4...
Article
Full-text available
In their paper, Spiess et al. (2021) published structural, geochronological, and EBSD data on one of the monzogranite apophyses (Capo Bianco) of the buried Porto Azzurro Pluton (island of Elba, Northern Apennines, Italy), a pluton emplaced in the upper crust (P < 0.2 GPa; e.g. Papeschi et al., 2019). The authors publish a new U/Pb age of 6.4 ± 0.4...
Article
Full-text available
We document the tectonic and metamorphic evolution of thrust nappes of the eastern island of Elba. The area exposes a natural cross section of the Northern Apennines hinterland, from the metamorphic basement units to the overlying continent-and ocean-derived nappes. We integrated mapping, analysis of structures and microstructures, and the interpre...
Article
Full-text available
The E‐vergent Northern Apennines formed by Oligocene–Miocene convergence and westward subduction of Adria beneath Europe. Extension ensued in the Mid–Late Miocene reflecting lower plate roll‐back and causing opening of the back‐arc Northern Tyrrhenian Sea. Post‐orogenic extension is commonly advocated as the main driver of the exhumation of the bel...
Conference Paper
Full-text available
The Northern Tyrrhenian Sea is a key area in the Northern Apennines, classically interpreted as documenting the transition from contractional tectonics to back-arc extension [1]. Exhumed metamorphic complexes preserve high pressure-low temperature (HP-LT) assemblages that formed during early subduction and continental collision in the region. The l...
Article
Full-text available
The Punta Bianca Unit (NW Italy) is a continent-derived metamorphic unit that experienced underthrusting and later exhumation in the hinterland sector of the Northern Apennines fold-and-thrust belt. We present a novel 1:5000 scale geological map that aims to illustrate the polyphase tectonic evolution of the Punta Bianca Unit and its relationships...
Article
Full-text available
The Acquadolce subunit on the Island of Elba, Italy, records blueschist‐facies metamorphism related to the Oligocene‐Early Miocene stages of continental collision in the Northern Apennines. The blueschist‐facies metamorphism is represented by glaucophane‐ and lawsonite‐bearing metabasite associated with marble and calcschist. These rock types occur...
Article
Full-text available
Finite strain analyses were performed on a deformed metaconglomerate from the Calamita Unit in the Island of Elba. The Calamita Unit is a synkinematic contact aureole that was shaped by Late Miocene contractional deformation coeval with high‐temperature metamorphism. The metaconglomerate occurs as an L‐tectonite in the footwall of a major thrust, e...
Article
Full-text available
Raw Electron Back Scatter Diffraction (EBSD) data on deformed quartz from a mylonitic quartzite sample of the Calamita Schists (Island of Elba, Italy) is available at http://dx.doi.org/10.17632/8c937t6zs4.3 . The investigated sample (IESP3SP78) was collected in quartz-rich outcrops exposed at the Praticciolo Cape and was used to realize an oriented...
Article
Full-text available
Structural and microstructural analyses and phase equilibria modeling of migmatitic amphibolite-facies metapelites from the late Carboniferous Calamita Schists, on the Island of Elba, Italy, show how the interplay between partial melting and regional (far-field) deformation assisted deformation at very shallow (P ≤ 0.2 GPa) crustal levels. Partial...
Poster
Full-text available
Mylonitic quartzites from SW Elba Island (Italy) were deformed at decreasing temperature across the brittle/ductile transition. Recrystallization by dislocation creep was followed by strain hardening and brittle fracturing of large quartz grains. Fluid ingress promoted the precipitation of tiny quartz and phyllosilicate grains along fractures, allo...
Conference Paper
Full-text available
Mylonitic quartzites from SW Elba Island (Italy) were deformed at decreasing temperature across the brittle/ductile transition. Recrystallization by dislocation creep was followed by strain hardening and brittle fracturing of large quartz grains. Fluid ingress promoted the precipitation of tiny quartz and phyllosilicate grains along fractures, allo...
Article
Full-text available
A mylonitic quartzite with conjugate and synthetic shear bands was investigated by Electron BackScatter Diffraction (EBSD) and optical microscopy to obtain insights on recrystallization mechanisms and strain localization in quartz at plastic to semibrittle conditions close to the brittle-ductile transition. The mylonitic quartzite deformed during L...
Thesis
Full-text available
This study focuses on the detailed investigation of the brittle/plastic transition in quartz-feldspathic rocks at upper-middle crustal conditions and aims to better understand the role of fluids and temperature during deformation. The Calamita Unit (Elba Island, Italy) is a high metamorphic grade unit (T ~ 650 °C) that has been intruded by a monzog...
Conference Paper
Full-text available
The Calamita Schists (Elba Island, Italy) were affected by contemporaneous pluton emplacement and thrusting that caused the development of heterogeneous high grade mylonitic shear zones. During post-pluton emplacement cooling, brittle deformation localized in cataclastic bands that exploit mylonitic shear bands and cross cut the mylonitic foliation...
Conference Paper
Full-text available
The Calamita Schists (Elba Island, Italy) are the host rocks of the buried Porto Azzurro pluton. Contact metamorphism, related to pluton emplacement, occurred at pressures of 0.18-0.20 GPa and temperatures exceeding 650 C, lasting less than 1 Ma. Contractional deformation, coeval with high temperature metamorphism, led to the development of mylonit...
Article
A network of shear zones that evolved through the brittle-ductile transition is exposed in the Calamita Schists, Elba Island, Italy. The shear zones formed during Late Miocene contractional deformation coeval with high grade contact metamorphism (∼650 °C) related to the emplacement of plutonic rocks at shallow crustal levels (∼7–10 Km). An early st...
Conference Paper
Full-text available
The Calamita Schists are a metamorphic complex that experienced transient (< 1 Ma) upper Miocene HT/LP metamorphism related to the emplacement of the Porto Azzurro pluton at P<0.2 GPa. HT/LP metamorphism was coeval with regional scale contractional tectonics leading to the development of meter to decameter ductile east-verging high-strain domains m...
Poster
Full-text available
A field and microstructural study of contemporaneous pluton-related thermal anomaly and thrust faulting highlights the mutual interaction between active regional tectonics, magma emplacement and contact metamorphism. The Calamita Complex is composed of highly strained HT/LP schists, metarenites and metacarbonates. HT metamorphism was caused by the...
Conference Paper
Full-text available
The Northern Tyrrhenian Sea (NTS) belongs to the hinterland portion of the Northern Apennine belt. This area was in turn affected by the formation of Apennine wedge during the Oligocene followed by nappe stacking, normal faulting, out-of-sequence thrusting, basin development and magmatism during the Miocene-Pliocene. Such complex evolution led to c...
Poster
Full-text available
The Northern Tyrrhenian Sea (NTS) belongs to the hinterland portion of the Northern Apennine belt. This area was in turn affected by the formation of Apennine wedge during the Oligocene followed by nappe stacking, normal faulting, out-of-sequence thrusting, basin development and magmatism during the Miocene-Pliocene. Such complex evolution led to c...
Conference Paper
Full-text available
In Eastern Elba Island the Oligo-Miocene nappe stackof the Northern Apennines was intruded by the Porto Azzurro pluton (6.3 – 5.9 Ma) at upper crustal level (40Ar/ 39 Ar dating of synkinematic muscovite and phlogopite in the shear zones constrained deformation between 6.76±0.08 Ma and 6.23±0.06 Ma (Musumeci et al., 2015 and references therein). The...
Poster
Full-text available
Mechanical interaction between emplacement of plutons and respective country rocks is described by two end members, 1) the forceful or active and 2) the permitted or passive types. The presence of ductile to brittle structures around plutons has been addressed to the pluton itself (e.g. pluton ballooning), tectonic processes or a combination of bot...
Conference Paper
Full-text available
Mechanical interaction between emplacement of plutons and respective country rocks is described by two end members, 1) the forceful or active and 2) the permitted or passive types 1. The presence of ductile to brittle structures around plutons has been addressed to the pluton itself (e.g. pluton ballooning 2), tectonic processes 3 or a combination...
Poster
Full-text available
The Northern Apennine (Italy) is characterized by the occurrence of low-grade metamorphic units derived from the Adria plate margin, which are the lowermost tectonic units of the apenninic nappe-pile. They are commonly referred to as the Tuscan Metamorphic Units and they comprise the Apuane and Massa units. These units, including basement rocks of...
Conference Paper
Full-text available
The Northern Apennine (Italy) is characterized by the occurrence of low-grade metamorphic units derived from the Adria plate margin, which are the lowermost tectonic units of the apenninic nappe-pile. They are commonly referred to as the Tuscan Metamorphic Units and they comprise the Apuane and Massa units. These units, including basement rocks of...
Thesis
Full-text available
The Northern Apennine (Italy) is characterized by the occurrence of low-grade metamorphic units derived from the Adria plate margin, which are the lowermost tectonic units of the apenninic nappe-pile. They are commonly referred to as the Tuscan Metamorphic Units and they comprise the Apuane and Massa units. These units, including basement rocks of...
Thesis
Full-text available
Nel basamento sardo è documentata in letteratura l’attività transpressiva della linea Posada-Asinara, una zona di taglio destra milonitica plurichilometrica attiva durante l’orogenesi varisica, che giustappone il complesso migmatitico a metamorfiti di medio e basso grado. L’attività della zona di taglio è limitata alla seconda fase deformativa ed i...

Questions

Questions (5)
Question
A retired professor used to have this image in her presentations. It is really nice, as it shows a terminological correlation between the Udden-Wentworth grain size scale for terrigeneous rocks and the nomenclature of terrigeneous and carbonate rocks. Unfortunately, I did not find reference for the original paper where this chart was published and I am really curious if anybody knows that!
Thanks in advance,
Samuele
Question
Dear all,
I am struggling to model a rock which contains the assemblage K-white mica + Na-white mica + chlorite + quartz + graphite + rutile. I have followed step by step the tutorial available on Perplex's website.
which suggests to model graphite-bearing rocks as an open system with respect to a binary H2O-CO2 fluid with buffered f(O2).
Following the tutorial, I have set a H2O-CO2 fluid in excess, modeled with equation 10 by Connolly & Cesare, 1993), buffered with X(O). Set SiO2 and O2 as excess components, then specified a sectioning value for X(O) of 0.33333333333333334 (1/3).
What I get from vertex is always the same error:
**error ver015* missing composant for O2.
I have tried everything. Changed equation, sectioning value, removed fluid/components in excess but it doesn't work.
Therefore, I was wondering if there is a better way to model a graphite-bearing rock.
Attached, you may find the DAT file for Perplex
Thank you very much.

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Projects

Projects (4)
Project
Analyzing meso- and microstructures in exhumed accretionary complexes as a proxy to understand the geological evidence of earthquakes and aseismic creep and derive mechanical and rheological constraints on deformation in subduction zones.
Project
Combining field mapping, structural, microstructural, and petrological analyses to investigate the evolution of metamorphic units in the northern Apennines during (1) underthrusting, (2) exhumation, and (3) magma emplacement.
Archived project
This project is focused on the Massa Unit cropping out in the Punta Bianca area. It involves field mapping, structural and microstructural analysis and analysis of the metamorphism using the chlorite-phengite-quartz-water multi equilibrium approach, with the aim to constrain the tectonometamorphic evolution of the investigated unit.