Vavilov seamount: A mildly alkaline Quaternary volcano in the Tyrrhenian Basin

Robin, Claude; Colantoni, P.; Gennesseaux, M.; Réhault, Jean-Pierre

doi:10.1016/0025-3227(87)90071-5

Cited by 35 publications

(51 citation statements)

References 18 publications

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“…12), and have a mildly alkaline affinity (Fig. 10), suggesting Vavilov is independent of the oceanic crust which supports it, as already stressed by Robin et al (1987).…”

Section: Intersite Relationships Within Vavilov Basinmentioning

confidence: 92%

“…Sample C from unit 3 resembles Hole 65 5 B basalts except in its higher Na 2 0 con tent, whereas samples D and E from upper unit 1 contain more K 2 0 and MgO, and less CaO. More recent basalts sampled at the base of Vavilov Seamount (Robin et al, 1987) differ from most of the surrounding seafloor rocks by their higher abun dances of K 2 0, Ti0 2 , and lower LOI values. On the basis of these elements, they often plot outside the fields of both N-MORB and BAB (Fig.…”

Section: Intersite Relationships Within Vavilov Basinmentioning

confidence: 97%

“…They are Vavilov and Marsili seamounts. Lavas from Vavilov have been described as tholeiitic/transitional basalts (Selli et al, 1977;Beccaluva et al, 1982), to mildly alkaline ba salts independent of the surrounding oceanic crust (Robin et al, 1987).…”

Section: Geological Settingmentioning

confidence: 99%

“…(Feraud, this volume), and those from Vavilov Seamount are much more recent, i.e., less than 0.5 m.y. (Robin et al, 1987).…”

Section: Intersite Relationships Within Vavilov Basinmentioning

confidence: 99%

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Petrology and Geochemistry of Basalts from the Vavilov Basin (Tyrrhenian Sea), Ocean Drilling Program Leg 107, Holes 651A and 655B

Bertrand¹,

Boivin²,

Robin³

1990

Proceedings of the Ocean Drilling Program

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During ODP Leg 107, two holes were drilled in the basement of Vavilov Basin, a central oceanic area of the Tyrrhe nian sea. Hole 655B is located near the Gortani ridge in off-axis position at the western rim of the basin; Hole 651A is located on a basement swell at the axis of the basin. This paper deals with mineral chemistry, major and trace element geochemistry, and petrogenesis of the basalts recovered in the two holes.The mineralogy of the basalts is broadly homogeneous, but all of them have suffered important seawater alteration. Their major-element compositions are similar to both normal-mid-ocean-ridge-basalts (N-MORB) and back-arc-basalts (BAB) except for Na 2 0 contents (BAB-like), and K 2 0 which is somewhat enriched in upper unit of Hole 651 A. Their affinity with N-MORB and BAB is confirmed by using immobile trace elements such as Zr, Y, and Nb. However, basalts from the two sites present contrasting geochemical characteristics on spidergrams using incompatible elements. Hole 655B basalts are homogeneous enriched tholeiites, similar to those from DSDP Hole 373 (located on the opposite side of the basin near the eastern rim), and show affinities with enriched MORB (E-MORB). At Hole 651 A, the two basalt units are chemically distinct. One sample recovered in lower unit is rather similar to those from Hole 655B, but basalts from upper unit display calc-alkaline characteristic evidenced by the increase of light-ion-lithophile-element (LILE)/ high-field-strength-element (HFSE) ratio, and appearance of a negative Nb-anomaly, making them comparable with orogenic lavas from the adjacent Eolian arc. The observed chemical compositions of the basalts are consistent with a derivation of the magmas from a N-MORB type source progressively contaminated by LILE-enriched fluids released from dehydration of the bordering subducted plate.Implications for evolution of the Tyrrhenian basin are tentatively proposed taking into consideration geochemical and chronological relationships between basalts from Leg 107 Holes 655B and 651 A, together with data from Leg 42 Site 373 and Vavilov Seamount. These data illustrate back-arc spreading in ensialic basin closely associated with the maturation of the adjacent subduction, followed by the growth of late off-axis central volcano, whereas the active sub duction retreats southeastward.

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“…12), and have a mildly alkaline affinity (Fig. 10), suggesting Vavilov is independent of the oceanic crust which supports it, as already stressed by Robin et al (1987).…”

Section: Intersite Relationships Within Vavilov Basinmentioning

confidence: 92%

Section: Intersite Relationships Within Vavilov Basinmentioning

confidence: 97%

Section: Geological Settingmentioning

confidence: 99%

“…(Feraud, this volume), and those from Vavilov Seamount are much more recent, i.e., less than 0.5 m.y. (Robin et al, 1987).…”

Section: Intersite Relationships Within Vavilov Basinmentioning

confidence: 99%

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Petrology and Geochemistry of Basalts from the Vavilov Basin (Tyrrhenian Sea), Ocean Drilling Program Leg 107, Holes 651A and 655B

Bertrand¹,

Boivin²,

Robin³

1990

Proceedings of the Ocean Drilling Program

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“…Also reported was a breccia composed of basaltic clasts (Robin et al, 1987). Basalts of this volcano, the upper part of which is late Pleistocene, fall into the mildly alkaline series (Robin et al, 1987).…”

Section: Discussionmentioning

confidence: 99%

Mineralogy of Firm Muds and Mudstones Associated with Volcanosedimentary Layers from the Tyrrhenian Sea, Holes 650A and 651A, ODP Leg 107

Allouc¹,

Champetier²

1990

Proceedings of the Ocean Drilling Program

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At Holes 650A and 651 A, set respectively in the Marsili Basin and the Vavilov Basin, Pleistocene sediments (turbiditic inputs interbedded with essentially hemipelagic sediments) may show layers of mudrocks with moderate to strong induration. Except in the two samples from Hole 651 A, it seems that zeolite crystallization does not play a role in the induration phenomenon. This latter appears to result from in situ clay authigenesis. Secondary K-Fe beidellite or Fe-Mg beidellite form diagenetic growths and bridges between sedimented particles. Turbidites are rich in volcaniclastics (glass, pumices and other volcanogenic elements) but the induration phenomenon appears to be associated essentially with the occurrence of basaltic detritus. It is proposed that clay authigenesis results from low temperature alteration of basaltic fragments issued from Vavilov and probably Marsili seamounts in sediments isolated from seawater by overlying deposits.

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Seismic structure of the Central Tyrrhenian basin: Geophysical constraints on the nature of the main crustal domains

Prada¹,

Sallarès²,

Ranero

et al. 2014

JGR Solid Earth

101

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[1] In this work we investigate the crustal and tectonic structures of the Central Tyrrhenian back-arc basin combining refraction and wide-angle reflection seismic (WAS), gravity, and multichannel seismic (MCS) reflection data, acquired during the MEDOC (MEDiterráneo OCcidental)-2010 survey along a transect crossing the entire basin from Sardinia to Campania at 40°N. The results presented include a~450 km long 2-D P wave velocity model, obtained by the traveltime inversion of the WAS data, a coincident density model, and a MCS poststack time-migrated profile. We interpret three basement domains with different petrological affinity along the transect based on the comparison of velocity and velocity-derived density models with existing compilations for continental crust, oceanic crust, and exhumed mantle. The first domain includes the continental crust of Sardinia and the conjugate Campania margin. In the Sardinia margin, extension has thinned the crust from~20 km under the coastline to~13 km~60 km seaward. Similarly, the Campania margin is also affected by strong extensional deformation. The second domain, under the Cornaglia Terrace and its conjugate Campania Terrace, appears to be oceanic in nature. However, it shows differences with respect to the reference Atlantic oceanic crust and agrees with that generated in back-arc oceanic settings. The velocities-depth relationships and lack of Moho reflections in seismic records of the third domain (i.e., the Magnaghi and Vavilov basins) support a basement fundamentally made of mantle rocks. The large seamounts of the third domain (e.g., Vavilov) are underlain by 10-20 km wide, relatively low-velocity anomalies interpreted as magmatic bodies locally intruding the mantle.

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Vavilov seamount: A mildly alkaline Quaternary volcano in the Tyrrhenian Basin

Cited by 35 publications

References 18 publications

Petrology and Geochemistry of Basalts from the Vavilov Basin (Tyrrhenian Sea), Ocean Drilling Program Leg 107, Holes 651A and 655B

Petrology and Geochemistry of Basalts from the Vavilov Basin (Tyrrhenian Sea), Ocean Drilling Program Leg 107, Holes 651A and 655B

Mineralogy of Firm Muds and Mudstones Associated with Volcanosedimentary Layers from the Tyrrhenian Sea, Holes 650A and 651A, ODP Leg 107

Seismic structure of the Central Tyrrhenian basin: Geophysical constraints on the nature of the main crustal domains

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