A snapshot of the Late Jurassic Western Tethys seafloor composition and morphology provided by the geochemistry of pelitic sediments (Corsica, Central Alps and Northern Apennines)

Bracciali, Laura; Pandolfi, Luca; Rocchi, Sergio

doi:10.1111/bre.12036

Cited by 4 publications

(5 citation statements)

References 117 publications

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“…Samples from Platta nappe are from Bracciali et al . [] (green symbols) and the reference value of PAAS (black cross) from Condie []. See caption in Figure .…”

Section: The Fluid Signature In the Sedimentsmentioning

confidence: 88%

“…The data of the Radiolarite formation are from this study and Bracciali et al . []. Data from Calpionella and Palombini formations are from Bracciali et al .…”

Section: The Fluid Signature In the Sedimentsmentioning

confidence: 99%

“…Data from Calpionella and Palombini formations are from Bracciali et al . []. Reference data are: PAAS (Post‐Archean Australian Shale) and NASC (North American Shale Composite) from Condie []; Internal Ligurian Units (ILU) and Toscan nappe (TN) in Italy; and Balagne nappe in Corsiga from Bracciali et al .…”

Section: The Fluid Signature In the Sedimentsmentioning

confidence: 99%

“…Samples are located in the ZoS and Murtir€ ol in the Err nappe (blue symbols). Samples from Platta nappe are from Bracciali et al [2013] (green symbols) and the reference value of PAAS (black cross) from Condie [1993]. See caption in Figure 12.…”

Section: Tracing Fluids From the Mantle Through The Crust Into Sedimentsmentioning

confidence: 99%

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Tracing mantle‐reacted fluids in magma‐poor rifted margins: The example of Alpine Tethyan rifted margins

Pinto

Manatschal

Karpoff

et al. 2015

Geochem Geophys Geosyst

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The thinning of the crust and the exhumation of subcontinental mantle in magma‐poor rifted margins is accompanied by a series of extensional detachment faults. We show that exhumation along these detachments is intimately related to migration of fluids leading to changes in mineralogy and chemistry of the mantle, crustal, and sedimentary rocks. Using field observation and analytical methods, we investigate the role of fluids in the fossil distal margins of the Alpine Tethys. Using Cr‐Ni‐V, Fe, and Mn as tracers, we show that fluids used detachment faults as pathways and interacted with the overlying crust and sediments. These observations allow us to discuss when, where, and how this interaction happened during the formation of the rifted margin. The results show that: (i) serpentinization of mantle rocks during their exhumation results in the depletion of elements and migration of mantle‐reacted fluids that are channeled along active detachment system; (ii) in earlier‐stages, these fluids affected the overlying syntectonic sediments by direct migration from the underlying detachments;(iii) in later‐stages, these fluids arrived at the seafloor, were introduced into, or “polluted” the seawater and were absorbed by post tectonic sediments. We conclude that a significant amount of serpentinization occurred underneath the hyperextended continental crust, and that the mantle‐reacted fluids might have modified the chemical composition of the sediments and seawater. We propose that the chemical signature of serpentinization related to mantle exhumation is recorded in the sediments and may serve as a proxy to date serpentinization and mantle exhumation at present‐day magma‐poor rifted margins.

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“…Samples from Platta nappe are from Bracciali et al . [] (green symbols) and the reference value of PAAS (black cross) from Condie []. See caption in Figure .…”

Section: The Fluid Signature In the Sedimentsmentioning

confidence: 88%

“…The data of the Radiolarite formation are from this study and Bracciali et al . []. Data from Calpionella and Palombini formations are from Bracciali et al .…”

Section: The Fluid Signature In the Sedimentsmentioning

confidence: 99%

Section: The Fluid Signature In the Sedimentsmentioning

confidence: 99%

Section: Tracing Fluids From the Mantle Through The Crust Into Sedimentsmentioning

confidence: 99%

See 2 more Smart Citations

Tracing mantle‐reacted fluids in magma‐poor rifted margins: The example of Alpine Tethyan rifted margins

Pinto

Manatschal

Karpoff

et al. 2015

Geochem Geophys Geosyst

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show abstract

“…The ophiolites are characterized by a thin sequence, up to 1 km, consisting of a basement made up of mantle lherzolites, intruded by gabbros and covered by a volcano‐sedimentary complex, where sedimentary breccias, basaltic flows, and radiolarites are complexly intermixed (Abbate et al, ; Bracciali et al, and quoted references). This stratigraphy has been interpreted as representative of an ophiolite sequence developed into a slow‐spreading ridge (Treves & Harper, and quoted references).…”

Section: Evidence For a Campanian‐maastrichtian Double‐vergent Beltmentioning

confidence: 99%

A Revised Subduction Inception Model to Explain the Late Cretaceous, Double‐Vergent Orogen in the Precollisional Western Tethys: Evidence From the Northern Apennines

2017

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The Meso‐Cenozoic alpine belts of the Mediterranean area are characterized by complex architectures, result of a complex subduction and collision evolution that preserve also a legacy of the rifting‐related configuration of the continental margins. The Northern Apennines is a segment of these belts originated during closure of the Ligure‐Piemontese ocean and collision between the Europe and Adria plates. The different configuration of the Adria and Europe margins, inherited from asymmetric rifting, is recorded in the Ligurian Units that preserve incorporation into the subduction factory of fragments of the oceanic domain (Internal Ligurian Units) and portions of the Ocean‐Continent Transition Zone (OCTZ) toward Adria (External Ligurian Units). We provide here unpublished data on the stratigraphy and sedimentology of these units, together with a review of what is already established in literature. Both data sets combined testify that at 80 Ma, an accretionary prism was growing between the deposition basins of the two groups of units and fed both basins with clasts from the ocean realm, the continental crust, and the subcontinental mantle. We propose that closure of the Ligure‐Piemontese ocean occurred through subduction that nucleated at the transition from the oceanic plate and the thinned Adria margin and developed a double‐vergent prism by accreting oceanic material and continental extensional allochthons from the OCTZ. We believe the revised site of subduction initiation, and the precollisional architecture, inherited from the rifting and spreading phases, allows reconciling most of the discrepancies between the various interpretations proposed in literature for the precollisional evolution of the Apennines.

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Plio-Pleistocene exhumation of the eastern Himalayan syntaxis and its domal ‘pop-up’

Bracciali

Parrish

Najman

et al. 2016

Earth-Science Reviews

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A snapshot of the Late Jurassic Western Tethys seafloor composition and morphology provided by the geochemistry of pelitic sediments (Corsica, Central Alps and Northern Apennines)

Cited by 4 publications

References 117 publications

Tracing mantle‐reacted fluids in magma‐poor rifted margins: The example of Alpine Tethyan rifted margins

Tracing mantle‐reacted fluids in magma‐poor rifted margins: The example of Alpine Tethyan rifted margins

A Revised Subduction Inception Model to Explain the Late Cretaceous, Double‐Vergent Orogen in the Precollisional Western Tethys: Evidence From the Northern Apennines

Plio-Pleistocene exhumation of the eastern Himalayan syntaxis and its domal ‘pop-up’

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