Geochemistry and geochronology of the Mersin ophiolite within the Eastermn Mediterranean tectonic frame (Southern Turkey)
Başlık çevirisi mevcut değil.
- Tez No: 400562
- Danışmanlar: PROF. DR. MICHEL DELALOYE, PROF. ERGÜZER BİNGÖL
- Tez Türü: Doktora
- Konular: Deprem Mühendisliği, Jeoloji Mühendisliği, Earthquake Engineering, Geological Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1996
- Dil: İngilizce
- Üniversite: Université de Genève
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 257
Özet
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Özet (Çeviri)
The Mersin ophiolite, which is one of the Cretaceous ophiolitic massifs situated on the southern flank of the Tauride belt in southern Turkey, is bounded tectonicaly by the sinistral Ecemis fault to the east, the Bolkardag metarnorphics to the north and covered by Miocene carbonates to the south and west. The Mersin ophiolite having approximately 6 km thick oceanic crustal section presents, from bottom to top, following units: Subophiolitic metarnorphics, mantle tectonites, ultramafic and mafic cumulates, basaltic lavas and associated deep marine sediments. All this units rest tectonicaly on the ophiolitic melange. Ophiolitic melange in the study area comprises continental margin units, rift-related sediments, platform carbonates, serpantinized harzburgites and fragments of subophiolitic metamorphic rocks. Subophiolitic metamorphic rocks observed beneath the mantle tectonites as a thin slice (>100 m) consist mainly of amphibolite, amphibolitic schist, micaschist, marble, calcschist. These metamorphic rocks yielding an age range between 92 and 96 Ma (^Arn^Ar) are deformed and cut by post metamorphic diabase dikes which give slightly younger ages (89-63 Ma from ^Ar/^Ar). These results suggest that intraoceanic thrusting (compressional event) was completed rapidly (~ 4 Ma) and converted into extensional regime (perhaps in less than 3 m.y.) during which postkinematic dike emplacement occured. Major and trace element analyses indicate that ocean island or seamount basaltic rocks are possible rock assemblages from which subophiolitic metarnorphics were derived. Cumulative rocks having over 3 km thickness start with dunite, wherlite and clinopyroxenite at the bottom and pass into gabbroic rocks. The cumulates exhibiting adcumulate and mesocumulate texture show some accumulation features such as cyclic sedimentation, size grading, graded layering, and igneous lamination in the magma chamer. Limited cryptic variation in plagioclase (An95-9i)-olivine (Fo9i-go)-cHnopyroxene (Mg93_77), absence of evidence of zoning in intercumulus and cumulus minerals, crystallization of clinopyroxene before plagioclase all indicate that high pressure fractionation was present in the Mersin ophiolite magma chamber. Volcanic suites in the study area are characterized by alkaline (Upper Jurassic-Early Cretaceous) and tholeiitic (Late Cretaceous ?) basaltic rocks in terms of major, trace element and mineral chemistry. Alkali basalts show the features of ocean island/seamount basalts whereas the tholeiitic basalts are characterized by island arc basalts. The ophiolite body is cross-cut at all structural levels by numerous mafic dyke intrusions. The dykes do not intrude the underlying melange or platform carbonates. Therefore dike emplacement postdate the fonnation of the ophiolite and metamorphic sole but predate the final obduction onto the Tauride platform. The post-metarnorphic dyke swarms suggest geochemical character of Island Arc Tholeiites (IAT). Not only structural data observed in the subophiohtic metamorphic rocks but vergence of large scale faults and asymetric folding also show that the Mersin ophiolite obducted onto the active continental margin of the Taurides from southern branch of the Neotethys in southern Turkey.
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