Petrological, geochemical and isotopic characteristics of the Collo ultramafic rocks (NE Algeria)

Laouar, Rabah; Satouh, Adel; Salmi-Laouar, Sihem; Abdallah, Nachida; Cottin, Jean-Yves; Bruguier, Olivier; Bosch, Delphine; Ouabadi, Aziouz; Boyce, Adrian J.; Fallick, Anthony E.

doi:10.1016/j.jafrearsci.2016.10.012

Cited by 7 publications

(5 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This Early Miocene shortening phase also affected the Oligocene proto‐Algerian basin, inverted and incorporated into the newly developed orogenic wedge, its vestiges now present as amphibolites in the Kabylies or as extremely thinned sub‐continental mantle emplaced in the crust as in the Ronda peridotite of the Western Betics (Booth‐Rea et al., 2005; Fernandez et al., 2020; Garrido et al., 2011; Hidas et al., 2013; Marchesi et al., 2012) and the Collo peridotites in the Kabylies (Bouillin & Kornprobst, 1974; Laouar et al., 2017; Leblanc & Temagoult, 1989). Part of the proto‐Algerian basin presently occupies the Western Alboran basin, since it drifted westwards hundreds of km in a forearc position behind the retreating Betic‐Rif slab (Booth‐Rea et al., 2007, Figure 15).…”

Section: Discussionmentioning

confidence: 99%

Two Cenozoic Extensional Phases in Mallorca and Their Bearing on the Geodynamic Evolution of the Western Mediterranean

et al. 2021

View full text Add to dashboard Cite

We study the structure of the Llevant ranges in Mallorca with special emphasis on the Cenozoic extensional evolution of the island, which we integrate in a new geodynamic model for the Westernmost Mediterranean. Mallorca underwent two Cenozoic rifting phases in the Oligocene and Serravallian, before and after the development of its Foreland Thrust Belt (FTB). The first extensional event produced Oligocene semigrabens (≈29–23 Ma) that were inverted during the Early‐Middle Miocene (19–14 Ma) WNW‐directed FTB development. The second rifting event produced the extensional collapse of the Mallorca FTB during the Serravallian (≈14–11 Ma). This later rifting was polyphasic, with two orthogonal extensional systems, producing first NE‐SW, and then NW‐SE extension. The Oligocene extension affected a major part of the Western Mediterranean, opening the Liguro‐Provençal and other basins after the collapse of the Palaeogene AlKaPeCa orogen, and Mallorca, its former hinterland. Continued plate convergence nucleated a new subduction system in the Early Miocene that initiated along the Ibiza transform, producing the Mallorca WNW‐directed FTB and subduction of the South‐East Iberian passive margin. This process individualized the Betic‐Rif slab and initiated its westward retreat. Serravallian extension occurred at the northern edge of the subduction system coeval to the Algero‐Balearic basin opening. Extension initiated toward the SW direction of slab tearing and later rotated to a NW‐SE direction, probably in response to flexural and isostatic rebound. Through these processes the Alboran domain archipelago was driven toward the southwest until the Late Miocene, contributing to the present isolation of Mallorca from its Betic hinterland.

show abstract

Section: Discussionmentioning

confidence: 99%

Two Cenozoic Extensional Phases in Mallorca and Their Bearing on the Geodynamic Evolution of the Western Mediterranean

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The olivine mineral data also plot within the forearc peridotite zone on the Fo versus NiO wt% diagram (Figure 8d; Choi et al., 2008; Ishii et al., 1992; Johnson et al., 1990). According to the Al 2 O 3 versus Cr 2 O 3 diagram, orthopyroxene minerals are primary and once again plot within the forearc peridotite field (Figure 8e; Laouar et al., 2017).…”

Section: Resultsmentioning

confidence: 96%

“…Fields are from Laouar et al. (2017); (f) Al 2 O 3 (wt.%) versus Mg# in orthopyroxenes; (g) Cr# of Cr‐spinel versus Fo % in coexisting olivine. Olivine‐spinel mantle array and melting trend are from Arai (1994), abyssal peridotite field from Dick and Bullen (1984), forearc peridotite field from Ishii et al.…”

Section: Resultsmentioning

confidence: 99%

Fluid‐Mantle Interaction Along the Mariana Convergent Margin

Miladinova,

Kurz,

Hilmbauer‐Hofmarcher

2023

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Active serpentinite mud volcanoes in the forearc region of the Izu‐Bonin‐Mariana system represent an excellent natural laboratory for studying the geochemical processes along convergent plate margins and the associated forearc. During IODP Expedition 366, serpentinite mud with lithic clasts from the underlying forearc crust and mantle as well as from the subducting Pacific Plate was recovered. Ultramafic clasts from Fantangisña Seamount reveal very high degrees of serpentinization with mesh and bastite textures as well as development of late lizardite and chrysotile veins, which suggests serpentinization temperatures below 200°C. On the other hand, recovered harzburgites and, on occasion, dunites from Asùt Tesoru Seamount show a well‐preserved primary assemblage with low degrees of serpentinization and forearc peridotite characteristics. Fine‐grained antigorite associating with lizardite has been identified throughout the serpentine mud matrix, suggesting an alteration temperature of c. 340°C. Furthermore, alteration conditions during rodingitization point to temperatures of at least 228°C, estimated via chlorite geothermometry. Additionally, a rare ophicarbonate clast containing andraditic as well as Cr‐rich hydrogarnets from Asút Tesoru Seamount indicates crystallization temperatures of at least 230°C. Hence, a trend of lower temperature of serpentinization and higher degree of alteration closer to the trench. The detailed characterization of the fluid‐rock alteration conditions as well as fluids composition and transport permits a better constraining of the fluid–rock interactions and related mass transfers within subduction zones and during ascent of serpentinite fault gouge within mud volcano conduits and in mudflows after their emplacement on the flanks of the edifices.

show abstract

“…On the other hand, the studied serpentinites differ notably from the Collo peridotites and serpentinites, which crop out within the metamorphic basement of Lesser Kabylia not far from the Texenna area. Collo ultramafic rocks are much less serpentinized than those of Texenna, with antigorite instead of lizardite as the dominant serpentine polymorph; they display anhydrous mineral assemblages, unaltered Cr-spinels and their protolith is lherzolitic (Laouar et al, 2017). Collo ultramafic rocks belong to Alpine-type peridotites that were emplaced within an orogenic setting (Bouillin and Kornprobst, 1974;Laouar et al, 2017) and are similar to other peridotite massifs of the Western Mediterranean region: Lherz (Pyrenees); Lanzo massif (Italian Alps); Ronda (Betic Cordillera); and Beni Bousera (the Moroccan Rif).…”

Section: Comparison With Other Ophiolites Of the Western Mediterranea...mentioning

confidence: 99%

Petrology and geochemistry of the Texenna ophiolites, northeastern Algeria: Implications for the Maghrebian flysch suture zone

Boukaoud

Godard

Chabou

et al. 2021

Lithos

View full text Add to dashboard Cite

Petrological, geochemical and isotopic characteristics of the Collo ultramafic rocks (NE Algeria)

Cited by 7 publications

References 44 publications

Two Cenozoic Extensional Phases in Mallorca and Their Bearing on the Geodynamic Evolution of the Western Mediterranean

Two Cenozoic Extensional Phases in Mallorca and Their Bearing on the Geodynamic Evolution of the Western Mediterranean

Fluid‐Mantle Interaction Along the Mariana Convergent Margin

Petrology and geochemistry of the Texenna ophiolites, northeastern Algeria: Implications for the Maghrebian flysch suture zone

Contact Info

Product

Resources

About