Fault-related oceanic serpentinization in the Troodos ophiolite, Cyprus: Implications for a fossil oceanic core complex

Nuriel, Perach; Katzir, Yaron; Abelson, Meir; Valley, John W.; Matthews, Alan; Spicuzza, Michael J.; Ayalon, Avner

doi:10.1016/j.epsl.2009.02.029

Cited by 22 publications

(37 citation statements)

References 68 publications

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“…This also suggests involvement of deep infiltration of sea-water during sea floor spreading which may be followed by low temperature hydration and veining. Therefore, the present article on the basis of detailed field studies (supplemented by sound petrographic and mineral chemistry data) from Port Blair (11 • 39 N: 92 • 45 E) to Chiriyatapu (11 • 30 24 N: 92 • 42 30 E) stretch of south Andaman clearly reveals preservation of complete package as has been documented from other well known ophiolite succession like Troodos Complex of Cyprus (Nuriel et al 2009). Representative geological section of the presently investigated ophiolite suite has been presented and compared with that of classical ophiolites (after Coleman 1977) ( figure 9a and b).…”

Section: Discussion and Remarksmentioning

confidence: 77%

“…Troodos ophiolite is located near a fossil ridge-transform interaction where a sequence of heavily serpentinized rocks occurs adjacent to a major axis parallel fault (Nuriel et al 2009 have also been supported by high δ 18 O values (Nuriel et al 2009). They (Nuriel et al 2009) clearly demonstrated evidence of complete serpentinization, widespread chrysotile veining in the Troodos ophiolite complex based on their petrographic evidence and isotopic tracers (δD, δ 18 O). This also suggests involvement of deep infiltration of sea-water during sea floor spreading which may be followed by low temperature hydration and veining.…”

Section: Discussion and Remarksmentioning

confidence: 93%

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Complete preservation of ophiolite suite from south Andaman, India: A mineral-chemical perspective

et al. 2010

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Field studies supplemented by petrographic analyses clearly reveal complete preservation of ophiolite suite from Port Blair (11 • 39 N: 92 • 45 E) to Chiriyatapu (11 • 30 24 N: 92 • 42 30 E) stretch of South Andaman. The ophiolite suite reveals serpentinite at the base which is overlain unconformably by cumulate ultramafic-mafic members with discernible cumulus texture and igneous layering. Basaltic dykes are found to cut across the cumulate ultramafic-mafic members. The succession is capped by well exposed pillow basalts interlayered with arkosic sediments. Olivine from the basal serpentinite unit are highly magnesian (Fo 80.1-86.2 ). All clinopyroxene analyses from cumulate pyroxenite, cumulate gabbro and basaltic dyke are discriminated to be 'Quad' and are uniformly restricted to the diopside field. Composition of plagioclase in different lithomembers is systematically varying from calcic to sodic endmembers progressively from cumulate pyroxenite to pillow basalt through cumulate gabbro and basaltic dyke. Plagioclase phenocrysts from basaltic dyke are found to be distinctly zoned (An 60.7 -An 35.3 ) whereas groundmass plagioclase are relatively sodic (An 33 -An 23.5 ). Deduced thermobarometric data from different lithomembers clearly correspond to the observed preservation of complete ophiolite suite.

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Section: Discussion and Remarksmentioning

confidence: 77%

Section: Discussion and Remarksmentioning

confidence: 93%

Complete preservation of ophiolite suite from south Andaman, India: A mineral-chemical perspective

et al. 2010

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“…Oceanic subduction may also facilitate the introduction of water, needed for the serpentinization reactions, at the base of the overriding oceanic lithosphere. Late Miocene serpentinization‐driven uplift in Troodos also concurs with hydration of the mantle wedge by Messinian brines giving rise to the unusually high‐ δ 18 O values of Troodos serpentine (Figure ) [ Magaritz and Taylor , ; Nuriel et al ., ].…”

Section: Discussionmentioning

confidence: 99%

From ocean depths to mountain tops: Uplift of the Troodos ophiolite (Cyprus) constrained by low‐temperature thermochronology and geomorphic analysis

2016

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The timing and mode of uplift of the Troodos ophiolite are constrained by low-temperature thermochronology combined with geomorphic analysis. Zircon (U-Th)/He and apatite fission track cooling ages in the Troodos plutonic sequence are all Cretaceous (83-106 Ma) and within error of published zircon U-Pb crystallization ages. This indicates early cooling of the oceanic crust and termination of spreading axis magmatism at~90 Ma. Apatite (U-Th)/He ages decrease with reconstructed crustal depths from~40 Ma near the top of the sheeted-dike complex to~4 Ma within the mantle sequence. A prominent inflection point in the age versus depth curve defines the bottom of the exhumed helium partial retention zone and records the onset of rapid exhumation of the main Troodos massif at 6 ± 2 Ma. Inverse thermal modeling supports this conclusion, indicating that the timing of uplift is earlier than previously estimated. The boundaries of the mantle sequence exposed in the core of the Troodos structure closely overlap the boundaries of a concentric zone delineated by high local relief and higher channel steepness indices, indicating differential exhumation and uplift of this area relative to its surroundings. This zone also overlaps with a prominent negative Bouguer gravity anomaly. The timing and pattern of the Troodos ophiolite uplift suggest that it is driven by serpentinite diapirism, possibly triggered by Miocene reactivation of subduction along the Cyprean Arc. The worldwide ubiquity of suprasubduction zone ophiolites may thus reflect the importance of extensive serpentinization at the overthrusting mantle wedge in obduction processes.

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“…the rock fabric), an inheritance of the tectonometamorphic history from sea floor formation and/or orogenic wedge construction (e.g. Hermann and Müntener, 1996;Boschi et al, 2006;Nuriel et al, 2009). Within this wide range of geological processes, shear deformation and fluid-rock interaction enhance rock alteration and serpentinization, including fibrous minerals, under particular conditions of temperature and pressure (e.g.…”

Section: The Geodynamic Settingsmentioning

confidence: 99%

Linking rock fabric to fibrous mineralisation: a basic tool for the asbestos hazard

Vignaroli

Rossetti

Belardi

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. In recent years, many studies have addressed the effect on human health caused by asbestos exposures. As asbestos is a group of fibrous minerals that mainly occurs in mafic and ultramafic rocks (ophiolitic sequences), a close relationship between asbestos occurrence and the geological history of host rocks should be expected. By reviewing the existing literature and presenting characteristic examples, it is proposed a direct correspondence exists between the presence of fibrous minerals in ophiolites and the rock fabric systematics due to the combined activity of deformation, metamorphism/metasomatism, and rock/fluid interaction. Understanding the geological factors that may be at the origin of the nucleation/growth of fibrous minerals constitutes a necessary requirement for developing a methodological and analytical procedure to evaluate asbestos hazard (A H ) in the natural prototype (ophiolitic rocks). A parameterisation of the A H in function of the main geological processes that produce the rock fabric systematics in different tectonic/geodynamic settings is discussed. A geological multidisciplinary approach (based on geological-structural field evidence combined with textural, mineralogical, petrological, and geochemical investigations) is proposed as the prerequisite for the evaluation of A H in natural environments. This approach, in particular, can provide a robust basis to formulate a procedural protocol finalised to the mitigation of asbestos effects in environments where these effects are still a real threat.

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Fault-related oceanic serpentinization in the Troodos ophiolite, Cyprus: Implications for a fossil oceanic core complex

Cited by 22 publications

References 68 publications

Complete preservation of ophiolite suite from south Andaman, India: A mineral-chemical perspective

Complete preservation of ophiolite suite from south Andaman, India: A mineral-chemical perspective

From ocean depths to mountain tops: Uplift of the Troodos ophiolite (Cyprus) constrained by low‐temperature thermochronology and geomorphic analysis

Linking rock fabric to fibrous mineralisation: a basic tool for the asbestos hazard

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