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Topography,structural and exhumation history of the Admiralty Mountains region,northern Victoria Land,Antarctica

Geoscience Frontiers 2020年第5期11卷 1841-1858页

作者： Maria Laura Balestrieri Valerio Olivetti Federico Rossetti Cecile Gautheron Silvia Catto Massimiliano Zattin Istituto di geoscienze e Georisorse Consiglio Nazionale delle RicercheSede Secondaria Firenzevia G.La Pira 450121FirenzeItaly dipartimento di geoscienze Universita di PadovaPadovaItaly dipartimento di Scienze Universita degli Studi Roma 3RomaItaly GEOPS Univ.Paris SudCNRS Universite Paris-Saclay91405OrsayFrance

The Admiralty Mountains region forms the northern termination of the northern Victoria Land,*** quantitative data are available to reconstruct the Cenozoic morpho-tectonic evolution of this sector of the Antarctic plate,where the Admiralty Mountains region forms the northern termination of the western shoulder of the Mesozoic-Cenozoic West Antarctica Rift *** this study we combine new low-temperature thermochronological data(apatite fission-track and(U-Th-Sm)/He analyses)with structural and topography *** regional pattern of the fission-track ages shows a general tendency to older ages(80-60 Ma)associated with shortened mean track-lengths in the interior,and younger fission-track ages clustering at 38-26 Ma with long mean track-lengths in the coastal *** from other regions of Victoria Land,the younger ages are found as far as 50-70 km *** grain apatite(U-Th-Sm)/He ages cluster at 50-30 Ma with younger ages in the coastal *** analysis reveals that the Admiralty Mountains has high local relief,with an area close to the coast,180 km long and 70 km large,having the highest local relief of>2500 *** coincides with the location of the youngest fission-track *** shape of the area with highest local relief matches the shape of a recently detected low velocity zone beneath the northern TAM,indicating that high topography of the Admiralty Mountains region is likely sustained by a mantle thermal *** used the obtained constraints on the amount of removed crustal section to reconstruct back-eroded profiles and calculate the erosional load in order to test flexural uplift *** found that our back-eroded profiles are better reproduced by a constant elastic thickness of intermediate values(Te=20-30 km).This suggests that,beneath the Admiralty Mountains,the elastic properties of the lithosphere are different with respect to other TAM sectors,likely due to a stationary Cenozoic upper mantle thermal an

关键词： Antarctica Thermochronology Transantarctic mountains Rift margin uplift

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Lower Continental Crusts Involved in the Alpine Orogeny:New Insight from the Santa Lucia Nappe Metasediments(Corsica,France)

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Acta Geologica Sinica(English Edition) 2024年第4期98卷 904-920页

作者： Chiara FRASSI Maria di ROSA Luca PANDOLFI Michele MARRONI dipartimento di Scienze della Terra Universitàdi PisaVia Santa Maria 5356126 PisaItaly Istituto di geoscienze e Georisorse IGG-CNRVia Moruzzi50124 PisaItaly

In the Alpine Corsica(France),the Santa Lucia Nappe represents a peculiar unit preserving the unique relicts of Paleozoic lower to medium continental *** consists of composite basement affected by Permian granulite facies metamorphic conditions unconformably covered by a Late Cretaceous clastic sequence(Tomboni Conglomerate and Tralonca Flysch)affected by polyphase deformation and *** this work,we present a new reconstruction of the deformation events registered by the Tralonca Flysch during the Alpine *** D1 phase was testified by rare isoclinal *** D2 phase produced a continuous foliation and a map-scale sheath-fold with a top-to-W sense of *** D3 phase produced E-verging non-cylindrical folds and S3 crenulation cleavage that is not associated to metamorphic *** present the first temperature-pressure-deformation(P-T-d)path for the Tralonca Flysch,demonstrating that the Santa Lucia Nappe underwent accretion and then first stage exhumation in the Alpine wedge during the D1 phase with pressure and temperature peaks both occurred under blueschist metamorphic *** D2 phase occurred at lower pressure-temperature conditions during a second stage *** pressure-temperaturedeformation path is comparable with those of the Lower Units(i.e.,the subducted continental units of Alpine Corsica)suggesting a common geodynamic history.

关键词： blueschist-facies metamorphism P-T-d path Santa Lucia Nappe Corsica Alpine orogeny

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Large earthquakes along slow converging plate margins:Calabrian Arc paleoseismicity based on the submarine turbidite record

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Geoscience Frontiers 2023年第5期14卷 241-266页

作者： A.Polonia R.Melis P.Galli E.Colizza D.D.Insinga L.Gasperini Istituto di Scienze Marine(ISMAR-CNR) Consiglio Nazionale delle RicercheArea della Ricerca di BolognaItaly dipartimento di Matematica e geoscienze Universitàdegli Studi di TriesteItaly Presidenza del Consiglio dei Ministri Dipartimento della Protezione CivileServizio Rischio Sismico-RomaItaly

The Calabrian Arc subduction-rollback system hosts seismogenic faults capable of generating earthquakes exceeding magnitude *** earthquakes are the result of long-term geodynamic processes,documenting seismic activity during a sufficiently long time interval is of fundamental importance for hazard *** and historical data provide critical information on seismogenesis,but they cover time periods shorter than the recurrence times of large earthquakes,especially in areas with low deformation rates such as *** onshore paleoseismological studies are fundamental to compile earthquake catalogs,they are sometime affected by the relatively poor continuity of sedimentation in the subaerial *** this study we applied the paleoseismological approach to the submarine environment to reconstruct the record of high-energy sedimentary events triggered by seismic *** analyzed three gravity cores collected in disconnected sedimentary basins to reconstruct resedimentation processes during the Holocene,integrating inland information for a better assessment of tectonic activity and *** analyses of the sedimentary record constrained by radiometric dating allowed reconstructing event stratigraphy and linking resedimented deposits to specific *** and offshore data allow to identify large-magnitude earthquakes in the central Calabrian Arc subduction system during the Holocene,with inferred epicenters located either along normal faults onshore and/or related to the slab *** turbidite record reveals 20 major events during the last 10 ka,with sources including crustal faults in Calabria(***,Rossano and Cittanova faults).Analyses of sediment samples and high-resolution seismic reflection images allowed identification of different types of resedimented deposits during the last 30–50 *** basin-wide occurrence of three megaturbidites/homogenites suggests they are related to megatsunamis sourced by

关键词： Calabrian Arc Earthquakes Seismic shaking Sedimentation Seismo-turbidites

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Deformation history and processes during accretion of seamounts in subduction zones:The example of the Durkan Complex(Makran,SE Iran)

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Geoscience Frontiers 2023年第2期14卷 182-203页

作者： Edoardo Barbero Maria di Rosa Luca Pandolfi Morteza Delavari Asghar Dolati Federica Zaccarini Emilio Saccani Michele Marroni dipartimento di Fisica e Scienze della Terra Universitàdi Ferrara44123 FerraraItaly Istituto di geoscienze e Georisorse Consiglio Nazionale delle Ricerche(CNR)10125 TorinoItaly dipartimento di Scienze della Terra Universitàdi Pisa56126 PisaItaly Istituto di geoscienze e Georisorse Consiglio Nazionale delle Ricerche(CNR)56124 PisaItaly Faculty of Earth Sciences Kharazmi UniversityTehran 15719-19911Iran Department of Applied Geological Sciences and Geophysics University of Leoben8700 LeobenAustria

The Durkan Complex is a tectonic element of the Makran Accretionary Prism(SE Iran)that includes fragments of Late Cretaceous *** this paper,the results of map-to micro-scale structural studies of the western Durkan Complex are presented with the aim to describe its structural and tectonometamorphic *** Durkan Complex consists of several tectonic units bordered by mainly NNW-striking *** main deformation phases(D_(1),D_(2),and D_(3))are distinguished and likely occurred from the Late Cretaceous to the Miocene–Pliocene.D_(1) is characterized by sub-isoclinal to close and W-verging folds associated with an axial plane foliation and shear zone along the fold *** phase records the accretion of fragments of the seamount within the Makran at blueschist facies metamorphic conditions(160–300℃ and 0.6–1.2 GPa).D_(2) is characterized by open to close folds with subhorizontal axial plane that likely developed during the exhumation of previously accreted seamount *** upper Paleocene–Eocene siliciclastic succession unconformably sealed the D_(1) and D_(2) structures and is,in turn,deformed by W-verging thrust faults typical of D_(3).The latter likely testifies for a Miocene–Pliocene tectonic reworking of the accreted seamount fragments with the activation of out of sequence *** results shed light on the mechanism of accretion of seamount materials in the accretionary prisms,suggesting that seamount slope successions favour the localization and propagation of the basal dé*** study further confirms that the physiography of the subducting plates plays a significant role in the tectonic evolution of the subduction complexes.

关键词： Underplated seamount Makran Accretionary Prism Tectono-sedimentary evolution Tectono-metamorphic evolution Cretaceous Iran

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The western Durkan Complex(Makran Accretionary Prism,SE Iran):A Late Cretaceous tectonically disrupted seamounts chain and its role in controlling deformation style

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Geoscience Frontiers 2021年第3期12卷 503-527页

作者： Edoardo Barbero Luca Pandolfi Morteza Delavari Asghar Dolati Emilio Saccani Rita Catanzariti Valeria Luciani Marco Chiari Michele Marroni dipartimento di Fisica e Scienze della Terra Universitàdi FerraraVia Saragat 144123 FerraraItaly dipartimento di Scienze della Terra Universitàdi PisaVia S.Maria 5356126 PisaItaly Istituto di geoscienze e Georisorse CNRPisaVia G.Moruzzi 156124 PisaItaly Faculty of Earth Sciences Kharazmi UniversityShahid Mofatteh St.43TehranIran Istituto di geoscienze e Georisorse CNRFirenzeVia La Pira 450121 FirenzeItaly

The Durkan Complex is a key tectonic element of the Makran accretionary prism(SE Iran)and it has been interpreted as representing a continental margin *** present here a multidisciplinary study of the western Durkan Complex,which is based on new geological,stratigraphic,biostratigraphic data,as well as geochemical data of the volcanic and meta-volcanic rocks forming this *** data show that this complex consists of distinct tectonic slices showing both non-metamorphic and very low-grade metamorphic deformed *** and biostratigraphic data allow us to recognize three types of ***-Ⅰis composed by a Coniacian-early Campanian pelagic succession with intercalation of pillow lavas and minor volcaniclastic ***-Ⅱsuccession includes a volcanic sequence passing to a volcano-sedimentary sequence with Cenomanian pelagic limestones,followed by a hemipelagic *** succession is characterized by abundant mass-transport ***-Ⅲsuccession includes volcanic and volcano-sedimentary sequences,which are stratigraphically covered by a Cenomanian platform *** latter is locally followed by a hemipelagic *** volcanic rocks in the different successions show alkaline geochemical affinity,suggesting an origin from an oceanic within-plate *** new results indicate that the western Durkan Complex represents fragments of seamounts tectonically incorporated in the Makran accretionary wedge during the latest Late *** propose that incorporation of seamounts in the frontal prism caused a shortening of the whole convergent margin and possibly contributed to controlling the deformation style in the Makran Accretionary Wedge during Late Cretaceous-Paleocene times.

关键词： Tectonically disrupted seamounts Makran Late Cretaceous Iran Neo-Tethys

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Geological-structural and mineralogical approach to investigate the evolution of low- and very low-grade metamorphic units from the Intra-Pontide Suture zone(Central Pontides， Turkey)

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Journal of Earth Science 2021年

作者： Alessandro Ellero Chiara Frassi Mehmet Cemal G?ncüo?lu Marco Lezzerini Michele Marroni Giuseppe Ottria Luca Pandolfi Kaan Sayit Marco Tamponi Istituto di geoscienze e Georisorse-CNR dipartimento di Scienze della Terra， Università di Pisa Department of Geological Engineering， Middle East Technical University

A multidisciplinary approach combining multiscale geological-structural analyses （from field to microscale） and clay mineral transformations (clay mineralogy， illite and chlorite “crystallinity” and b cell dimension (b0) of K-white mica) was adopted to unravel the tectono-metamorphic evolution of low- and very low-grade tectono-metamorphic units from the Intra-Pontide Suture zone in northern Turkey. The mineralogical study allowed to better evaluate the structural stacking outlined during the geological mapping， leading to distinguish three tectono-metamorphic units， two in Epizone （Daday and Emirk?y units） and one in Anchizone （?ifter Unit） metamorphic conditions. The mesostructural and microstructural analyses suggest a polyphase tectonic-metamorphic evolution. The different macroscopic features observed between the two units characterized by the same Epizone metamorphism， can be justified by the evidence that these metamorphic conditions were acquired during the last stages of exhumation in the Daday Unit， while they constrained the metamorphic-peak conditions in the Emirk?y Unit. Contemporary analyses and comparison between structural and mineralogical data have thus proven to be a powerful tool to investigate the low-grade and very low-grade metamorphic environments， allowing at the same time to solve the apparent contradictions deriving from the mineralogical study and to significantly improve the detail of the geological mapping in the field.

关键词： Clay minerals Structural analyses Low-temperature metamorphism Epizone Anchizone diagenesis Intra-Pontide Suture zone Turkey

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Geological-structural and mineralogical approach to investigate the evolution of low- and very low-grade metamorphic units from the Intra-Pontide Suture zone（Central Pontides， Turkey）

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Journal of Earth Science 2021年

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The Intra-Pontide ophiolites in Northern Turkey revisited:From birth to death of a Neotethyan oceanic domain

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Geoscience Frontiers 2020年第1期11卷 129-149页

作者： Michele Marroni M.Cemal Goncüoglu Chiara Frassi Kaan Sayit Luca Pandolfi Alessandro Ellero Giuseppe Ottria dipartimento di Scienze della Terra Universita di Pisavia S.Maria 5356126PisaItaly Istituto di geoscienze e Georisorse-CNR Via G.Moruzzi 156124PisaItaly Department of Geological Engineering Middle East Technical University06531 AnkaraTurkey

The Anatolian peninsula is a key location to study the central portion of the Neotethys Ocean(s)and to understand how its western and eastern branches were *** of the lesser known branches of the Mesozoic ocean(s)is preserved in the northern ophiolite suture zone exposed in Turkey,namely,the Intra-Pontide suture *** is located between the Sakarya terrane and the Eurasian margin(i.e.,Istanbul-Zonguldak terrane)and consists of several metamorphic and non-metamorphic units containing ophiolites produced in supra-subduction settings from the Late Triassic to the Early *** preserved in the metamorphic units recorded pervasive deformations and peak metamorphic conditions ranging from blueschist to eclogite *** the nonmetamorphic units,the complete oceanic crust sequence is preserved in tectonic units or as olistoliths in sedimentary ***,structural,metamorphic and geochronological investigations performed on ophiolite-bearing units allowed the formulation of a new geodynamic model of the entire"life"of the IntraPontide oceanic basin(s).The reconstruction starts with the opening of the Intra-Pontide oceanic basins during the Late Triassic between the Sakarya and Istanbul-Zonguldak continental microplates and ends with its closure caused by two different subductions events that occurred during the upper Early Jurassic and Middle *** continental collision between the Sakarya continental microplate and the Eurasian margin developed from the upper Early Cretaceous to the *** presented reconstruction is an alternative model to explain the complex and articulate geodynamic evolution that characterizes the southern margin of Eurasia during the Mesozoic era.

关键词： Intra-Pontide suture zone Central Pontides Northern Turkey Ophiolites Neotethys Ocean Geodynamics

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Geological,Structural and Mineralogical Approach to Investigate the Evolution of Low-and very Low-Grade Metamorphic Units from the Intra-Pontide Suture Zone,Central Pontides,Turkey

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Journal of Earth Science 2021年第6期32卷 1512-1527页

作者： Alessandro Ellero Chiara Frassi Mehmet Cemal Göncüoğlu Marco Lezzerini Michele Marroni Giuseppe Ottria Luca Pandolfi Kaan Sayit Marco Tamponi Istituto di geoscienze e Georisorse-CNR Via G.Moruzzi 156124PisaItaly dipartimento di Scienze della Terra Universitàdi PisaVia S.Maria 5356126PisaItaly Department of Geological Engineering Middle East Technical University06800AnkaraTurkey

A multidisciplinary approach combining multiscale geological-structural analyses(from field to microscale) and clay mineral transformations(clay mineralogy, illite and chlorite "crystallinity" and b cell dimension(b_(0)) of K-white mica) was adopted to unravel the tectono-metamorphic evolution of low-and very low-grade tectono-metamorphic units from the Intra-Pontide suture zone in northern Turkey. The mineralogical study allowed to better evaluate the structural stacking outlined during the geological mapping, leading to distinguish three tectono-metamorphic units, two in epizone(Daday and Emirkoy units) and one in anchizone(Cifter Unit) metamorphic conditions. The mesostructural and microstructural analyses suggest a polyphase tectonic-metamorphic evolution. The different macroscopic features observed between the two units characterized by the same epizone metamorphism, can be justified by the evidence that these metamorphic conditions were acquired during the last stages of exhumation in the Daday Unit, while they constrained the metamorphic-peak conditions in the Emirkoy Unit. Contemporary analyses and comparison between structural and mineralogical data have thus proven to be a powerful tool to investigate the low-grade and very low-grade metamorphic environments, allowing at the same time to solve the apparent contradictions deriving from the mineralogical study and to significantly improve the detail of the geological mapping in the field.

关键词： clay minerals structural analyses low-temperature metamorphism epizone anchizone diagenesis Intra-Pontide suture zone Turkey

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The Calabrian Stage redefined

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Episodes 2008年第4期31卷 408-419页

作者： Maria Bianca Cita Luca Capraro Neri Ciaranfi Enrico di Stefano Fabrizio Lirer Patrizia Maiorano Maria Marino Isabella Raffi Domenico Rio Rodolfo Sprovieri Simona Stefanelli Gian Battista Vai Universita di Milano Dipartimento di Scienze della Terra ＂Ardito Desio＂ via Mangiagalli 34 20133 Milano Italy Universita di Padova Dipaltimento di Geoscienze via Giotto 1 35137 Padova Italy Universita di Bali Dipartimento di Geologia e Geofisica via Orabona 4 70125 Bali Italy Universita di Palermo Dipartimento di Geologia e Geodesia via Archirafi 22 90123 Palermo Italy. Istituto per I＇Ambiente Malino Costiero （IAMC） CNR Calata Porta di Massa 80133 Napoli Italy Universita di Chieti-Pescara Dipartimento di Geotecnologie per l＇Ambiente ed il Territorio via dei Vestini 3 1 66013 Chieti Scalo Italy Universita di Bologna Dipartimento di Scienze della Terra e Geologico-ambientali. Piazza di porta San Donato 1 40126 Bologna Italy.

The name Calabrian was introduced in the geological literature by the French stratigrapher Maurice Gignoux in 1910, and later described in his important monograph （633 pages）＂Les formations marines pliocknes et quaternaires de l＇ltalie du sud et de la Sicile ＂published in 1913. Detailed data were provided on several sections （Santa Maria di Catanzaro, Caraffa, Monasterace, Palermo） and on their fossil content. The Calabrian Stage has commonly been used for over fifty years as the oldest subdivision of the Qua- ternary, notably in the time scales of Berggren ＆ van Cou- vering （1974） and Haq ＆ Eysinga （1987）. However, after the GSSP for the Pliocene/Pleistocene boundary （P/P） was approved by INQUA in 1982 and ratified by lUGS in 1984 at the Vrica section of Calabria, there was a decline in the usage of the stage name, and an increasing tendency by many Quaternary workers to question the boundary stratotype. This was because there was increasing evidence that it did not correspond to the beginning of the ＂ice age＂. In doing so, they were not complying with the recommendations presented at the 18th International Geological Congress （IGC） in London, 1948 （Oakley, 1950）.

关键词：意大利卡拉布里亚地质学地层

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