3d mapping the ophiolite complex in the poltesco beach tokennack sands area of the lizard
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- Tez No: 717869
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Jeoloji Mühendisliği, Geological Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2019
- Dil: İngilizce
- Üniversite: Unıversıty Of Exeter
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
In the study area, there is a highly deformed and metamorphosed assemblage of ophiolitic complex which consists of peridotite, gabbro and sheeted dykes. All lithologies of the ophiolitic sequence cannot be seen in the study area because it is a limited area from a geological perspective. All lithologies of ophiolitic sequence can be seen in the Lizard Ophiolite Complex. Besides the ophiolitic complex, there are also other rock types. This study attempts to explain the relationship between the Lizard Ophiolite and non-ophiolitic sequence units which consist of granite, basalt and hornblende schists. All lithologies have special features in this area. Therefore, age and stratigraphic relations are also significant for the understanding of tectonic and magmatic events. According to the field, geochronological, microstructural and previous studies, Ordovician basement and Devonian rocks of the Lizard Ophiolite Complex exist in rocks dug up on the Lizard peninsula. Identified from the rocks of the Lizard Ophiolite Complex, evidence shows three tectonicmagmatic events that took place between the Early and Late Devonian periods. Stratigraphically, the oldest lithology is peridotites (393-386Ma). They were formed at the thrust emplacement (396-376 Ma). This period included the stage of peridotites occurrence and the creation of the Kennack Gneiss. The Kennack Gneiss was emplaced in the area via an unknown magma resource. The Kennack Gneiss is a commingling of the basalt and granitic magma assemblage. According to previous age analysis, granitic magma intruded (376 ± 1.7 Ma) with basaltic magma at the same stage in the study area. Kennack Gneiss' granite magma resource is different from the other South Cornwall granites. This granite magma resource is relatively older. The following stage was metamorphic events and emplacement of the gabbro and basalt dykes. The study area has a number of altered units which are affected by the physical and chemical processes. These can be seen in the thin sections and serpentinite evolution can explain all the processes in the study area. The last step was the serpentinisation process at the late-post emplacement (370 Ma). However, serpentinisation processes were also continuing during the Variscan orogeny (Late Carboniferous- Early Permo Triassic). The study suggests that the Poltesco Beach area was affected by the basal thrust fault. However, in the Kennack Sands area, the Kennack Gneiss should also have been affected by the basal thrust. According to the thin sections, the Kennack Gneiss' protolith is composed of igneous rocks. The Kennack Gneiss' granite section is I-type granite. Moreover, there are two indications of metasomatism in the study area. These can be seen in the contact points as a rodingitisation and chrysotile alteration. The final step includes 3D modelling of the ophiolites and granite sections which are providing different perspectives on the study area. This study carries out this 3D modelling of the Kennack Sands to Poltesco Beach cliff area using photogrammetry software.
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