Paola Tartarotti

Paola Tartarotti
University of Milan | UNIMI · Department of Earth Sciences "Ardito Desio"

Associate Professor

About

134
Publications
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Introduction
My research focuses on structural geology of modern oceanic lithosphere and ophiolites. I started working on the Alpine metaophiolites during my PhD (end of '80s). I was director of two geological sheets issued by the national program of geological mapping (Italian "CARG"). Since 1991 I've been working on the structure and petrography of modern ocean crust in the Pacific (ODP-IODP cruises) and in the Atlantic (Russian-Italian project PRIMAR-96, Gelendzhik research vessel) oceans.

Publications

Publications (134)
Article
Full-text available
Ultramafic and carbonate-rich rocks juxtaposed in an oceanic sedimentary mélange that experienced Alpine subduction (Champorcher, Aosta Valley, Italy) show evidence of metasomatic alteration at their contacts. The reactions that occurred at these contacts afford an assessment of the sources and compositions of fluids associated with the alteration,...
Article
The Jurassic ophiolites in the Northern Apennines and the Western Alps represent fossil mid-ocean ridge (MOR) oceanic lithosphere that formed in the Mesozoic Ligurian-Piedmont Ocean Basin (LPOB). Their sedimentary covers include chaotic rock units containing ophiolite-derived material. The processes of formation and the lithostratigraphic position...
Article
Full-text available
Ophiolites of the Alpine belt derive from the closure of the Mesozoic Tethys Ocean that was interposed between the palaeo-Europe and palaeo-Adria continental plates. The Alpine orogeny has intensely reworked the oceanic rocks into metaophiolites with various metamorphic imprints. In the Western Alps, metaophiolites and continental-derived units are...
Article
Full-text available
A metasomatic horizon (MH) occurs between the metaophiolite (serpentinite and metaophicarbonates) basement and metasedimentary sequence (chaotic rocks and calcschists) of the Lake Miserin Ophiolite, in the high pressure Zermatt-Saas Zone of the Northwestern Alps. Macro- and microstructural analyses combined with petrological and geochemical investi...
Preprint
Full-text available
A metasomatic horizon (MH) occurs between the metaophiolite (serpentinite and metaophicarbonates) basement and metasedimentary sequence (chaotic rocks and calcschists) of the Lake Miserin Ophiolite, in the high pressure Zermatt-Saas Zone of the Northwestern Alps. Macro- and microstructural analyses combined with petrological and geochemical investi...
Article
Full-text available
Holes BA1B and BA3A were drilled into the Wadi Tayin Massif, southern ophiolite complex of Oman, a fragment of the Tethyan oceanic lithosphere obducted onto the Arabian continent. Within the sequence, we have studied a portion of the shallow mantle, composed mainly of strongly serpentinised harzburgite that embeds dunitic levels, the biggest being...
Article
Full-text available
A subduction complex of the Northwestern Alps consists of serpentinites, eclogitic metagabbros, flysch-like metasediments, meta-ophicarbonates, and gneissic slices. Unlike other subduction complexes, it contains unusual hybridized rocks described here for the first time in the Northwestern Alps. They are preserved as patches interstitial in the met...
Article
Full-text available
The primary stratigraphic fabric of a chaotic rock unit in the Zermatt Saas ophiolite of the Western Alps was reworked by a polyphase Alpine tectonic deformation. Multiscalar structural criteria demonstrate that this unit was deformed by two ductile subduction-related phases followed by brittle-ductile then brittle deformation. Deformation partitio...
Article
Full-text available
We compare three poorly known, historical Ni-Co-bearing hydrothermal deposits in different geological settings in Italy: The Ni-Co-As-Sb-Au-bearing Arburese vein system (SW Sardinia), the Co-Ni-As-rich Usseglio vein system (Piedmont), and the small Cu-Ag-Co-Ni-Pb-Te-Se stockwork at Piazza (Liguria). These deposits share various (mineralogical, chem...
Data
T-P values estimated for the studied samples (see text)
Data
Auxiliary file to: "Melt migration in the upper mantle along the Romanche Fracture Zone (Equatorial Atlantic)"_Tartarotti et al.2002_Lithos, 63, 125-149
Article
The permeability structure of oceanic crust controls both the spatial and temporal extent of hydrothermal circulation, but the detailed geometry of fractures in seafloor rocks is not well‐known. We apply an equivalent channel model to veins, joints, faults, and breccias preserved in recovered cores from ODP‐IODP Hole 1256D to calculate paleo‐permea...
Article
The eclogite-facies Monviso meta-ophiolite Complex in the Western Alps represents a well-preserved fragment of oceanic lithosphere and related Upper Jurassic – Lower Cretaceous sedimentary covers. This meta-ophiolite sequence records the evolution of an oceanic core complex formed by mantle exhumation along an intra-oceanic detachment fault (the Ba...
Article
Full-text available
The geological map of the Saint-Marcel valley at the scale of 1:20,000 illustrates the tectonic setting of metaophiolites from the southern Aosta Valley, in the Italian side of the Western Alpine belt. The map highlights the sharp contact between the metaophiolitic basement and its metasedimentary cover, which mainly consists of quartzites, marbles...
Article
The eclogite facies Zermatt-Saas ophiolite in the Western Alps includes a composite chaotic unit exposed in the Lake Miserin area, in the southern Aosta Valley region. The chaotic unit is characterized by a block-in-matrix texture consisting of ultramafic clasts and blocks embedded within a carbonate matrix. This unit overlies massive serpentinite...
Article
Full-text available
The Late Jurassic Monviso ophiolite in the Western Alps is a multiply deformed, eclogite-facies metaophiolite that represents a remnant of the Alpine Tethyan oceanic lithosphere. The recent recognition of a pre-Alpine detachment fault in the Lower Tectonic Unit of this ophiolite has led to the discovery of an oceanic core complex, which developed d...
Article
The eclogite-facies Monviso ophiolite in the western Alps displays a complex record of Jurassic rift-drift, subduction zone, and Cenozoic collision tectonics in its evolutionary history. Serpentinized lherzolites intruded by 163 ± 2 Ma gabbros are exposed in the footwall of a thick shear zone (Baracun shear zone) and are overlain by basaltic lava f...
Article
In the southern Aosta Valley (Italian Northwestern Alps), metaophiolites are mainly composed of serpentinized mantle-derived peridotites intruded by gabbros and rodingitic dykes, well exposed in the Mount Avic area, and of smaller amounts of mafic rocks and metatrondhjemite. This rock assemblage recalls the "slow-spreading" lithosphere created at m...
Article
The eclogite-facies Monviso ophiolite in the western Alps displays a complex record of Jurassic rift-drift, subduction zone, and Cenozoic collision tectonics in its evolutionary history. Serpentinized lherzolites intruded by 163 ± 2 Ma gabbros are exposed in the footwall of a thick shear zone (Baracun shear zone) and are overlain by basaltic lava f...
Article
In the Inner Western Alps, three different types of block-in-matrix structures (BIMs) formed sequentially through time at a convergent plate margin. These show the superposition of progressive deformation from (i) subduction to eclogite-facies depths, (ii) collision, accretion, and exhumation of oceanic crust, represented by the Monviso Meta-ophiol...
Article
The Mount Avic massif consists of serpentinized peridotite exposed in the southern Aosta valley (Northwestern Alps), covering an area of ca. 180 km2. The 1:10,000 scale geological map is located in the southern portion of the massif, where serpentinite is in contact with ophiolitic rocks pertaining to the Piemonte Zone, which represents the fossil...
Article
Full-text available
The Hellenides fold-and-thrust range comprises two subparallel ophiolite belts of Triassic to Jurassic age - the external ophiolite belt (e.g., Mirdita, Pindos, Argolis) in the west, and the internal ophiolite belt in the east - broadly separated by the continental crust units of the Korabi-Pelagonian Zone. It is still a matter of debate whether th...
Article
The ocean crust is formed by the rising of magma from mid-ocean ridges and voluminous (1-30 km3) flows of lava away from ridge axes. However, our understanding of the emplacement kinematics of submarine lava is often limited to plan-view geometries of near-axis lava. Drilled cores provide in situ access to the intact internal structure of submarine...
Article
In the Western Alps the superposition of tectonic and/or tectono-metamorphic events, and mineral transformations, strongly concur in obscuring the original prevailing processes of formation of block-in-matrix structures. We document in this study the occurrence and nature of different types of block-in-matrix structures (i.e. sedimentary and tecton...
Article
In the Southern Aosta Valley, the St. Marcel Valley metaophiolites consist of mainly metavolcanics and their sedimentary cover metamorphosed under HP subduction-related metamorphism. A detailed geological map carried out in the St. Marcel Valley reveals that the metasedimentary cover, although transposed by the Alpine tectonics, is essentially made...
Article
New ocean crust is constantly being formed from mid-ocean ridge axis. Voluminous flows of lava are emplaced also away from the ridge axis, adding off-axis crustal layers to the crustal pile. Research on deep sea is of great importance to better understand the mechanisms and the nature of the crust forming and evolution. In this work, we decipher th...
Article
Full-text available
In the Western Alpine chain, ophiolites represent a section of the Mesozoic Tethys oceanic lithosphere, involved in subduction during the convergence between the paleo-Africa and paelo-Europe continents during the Cretaceous - Eocene. The Western Alpine ophiolites consist of several tectonic units, the most famous being the Zermatt-Saas and Combin...
Article
Full-text available
In the Alpine nappe stack, the Antrona Ophiolite (Italian side of the Western Central Alps) is sandwiched between the overlying continental Monte Rosa Nappe (upper Penninic domain) and the underlying Camughera- Moncucco continental Unit (middle Penninic). The ophiolite sequence includes ultramafic rocks, metagabbros and mafic rocks covered by calcs...
Article
The ophiolitic rocks of the Frido Unit include serpentinites derived from a lherzolitic and subordinately harzburgitic mantle, as suggested by microstructural and petrographical features. The serpentinites are englobed in tectonic slices where they are associated with metadolerite dykes and medium to high-grade metamorphic rocks such as amphibolite...
Article
The Liguride accretionary wedge in the Southern Apennine chain includes ophiolitic slices representing remnants of the Jurassic Tethyan ocean. In the northeastern slope of the Pollino Ridge (Calabria-Lucania border zone) ophiolitic rocks mostly consist of serpentinites crosscut by metadolerite dikes showing different types of textures, ranging from...
Article
RIASSUNTO La magnetite di Cogne: una chiave di lettura per capire l'origine delle serpentiniti presenti nel mélange di Cogne La scaglia serpentinitica mineralizzata a magnetite di Cogne è trasposta insieme a metadolomie, marmi e quarziti attribuiti al dominio Brianzonese e a calcescisti della Falda Piemontese. La magnetite è famosa per la sua purez...
Article
Specific studies on mechanics of fracturing in volcanic rocks are generally related to subareal environment. Such studies generally attribute the generation of vertical (Column-Bounding) and horizontal (Column-Normal) fractures to the thermal contraction of rocks and hence to their cooling history. Difficulties in operating at deep seafloor make si...
Article
Full-text available
The Antrona ophiolite is located in the Italian side of Western Central Alps. In the Alpine nappe stack, it lies at low structural levels, being sandwiched between the overlying continental Monte Rosa Nappe (upper Penninic) and the underlying Camughera-Moncucco continental Unit (middle Penninic). The ophiolite sequence includes serpentinized ultram...
Conference Paper
Full-text available
We report on the structural architecture and metamorphic evolution of a mélange, developed originally in an ocean-continent transition (OCT) zone along the boundary between the continental crust of the Sesia-Lanzo (SLZ) and the oceanic Piemonte Zones (PZ) in the axial part of the Western Alps. All these units were deformed together under high-press...
Article
The Antrona ophiolite is located in the Italian side of Western Central Alps. In the Alpine nappe stack, it lies at low structural levels, being sandwiched between the overlying continental Monte Rosa Nappe (upper Penninic) and the underlying Camughera-Moncucco continental Unit (middle Penninic). The ophiolite sequence includes serpentinized ultram...
Article
Massive basalt flows have been mainly observed and studied in subaerial environments, but data collected during sonar surveys and drilling cruises in ocean highlighted that thick lava fields (up to 70m in thickness) are widespread in the oceanic crust produced along fast spreading ridges. Most of the thickest lava flows include felsic differentiate...
Article
The Southern Apennines chain is a fold-and-thrust belt resulting from the convergence of the African and European plates and simultaneous roll-back of SE-directed Ionian subduction (Upper Oligocene-Quaternary). Ophiolites in the Southern Apennines are related to northwest subduction of the oceanic lithosphere pertaining to the Ligurian sector of th...
Conference Paper
The southern Apennine chain is a fold-and thrust belt formed between the upper Oligocene and Quaternary as a result of the convergence between the African and European plates and a simultaneous SE-directed rollback of the Ionian subducting lithospere. The ophiolitic sequences, which are part of the Southern Apennines, are remnants of the Ligurian o...
Article
A complete “in situ” section of upper oceanic crust, from extrusive lavas, through dikes into gabbros has been recently drilled for the first time in 15 Ma old crust created at the superfast spreading East Pacific Rise (EPR). The upper igneous basement cored at Ocean Drilling Program (ODP)–Integrated Ocean Drilling Program (IODP) Holes 1256C and 12...
Article
The Mount Avic ophiolite mainly consists of a large mass of serpentinites, which constitutes the base of a subunit of the Piemonte ophiolitic nappe. Serpentinites represent the mantle portion of the oceanic lithosphere of the Mesozoic Tethys and consist of antigorite-titanian clinohumite-diopside schists as products of oceanic metasomatism and tect...
Article
The Mount Avic serpentinites derive from mantle peridotites that have been involved in several geodynamic episodes, from their formation in the Jurassic Tethys, to the subduction event and suture in the Alpine chain. The main steps of their tectono-metamorphic evolution are inferred by investigating the texture and mineralogy of selected samples. S...
Article
Superfast spread (22 cm/a) upper oceanic crust drilled at Ocean Drilling Program site 1256 comprises a thick sequence of extrusive lavas underlain by a thin region of sheeted dikes. The sheeted dikes at this site are characterized by the intimate association of in situ hyaloclastic fragmentation and hydrothermal alteration. Lithostatic and magmasta...
Article
Full-text available
ODP Leg 206 and IODP Expeditions 309/312 drilled a complete intact in situ section of the upper oceanic crust formed in a super-fast spreading ridge at Site 1256 in the Guatemala Basin, Pacific Ocean. It starts from a sedimentary cover (~250m thick) followed by an extrusive lavas section that transitions into a sheeted dikes complex and the uppermo...
Article
Superfast-spread (22 cm/yr) upper oceanic crust drilled at ODP site 1256 comprises a thick sequence of extrusive lavas underlain by thin region of sheeted dikes. Sheet flows are the dominant flow type with minor intervals of pillow lava and hyaloclastite. An intimate association of brecciation, dike intrusions and hydrothermal mineralization charac...