Mohammed AL WOSABI, Ahmed AL AYDRUS

6331

Microfacies analysis and depositional environments of Tertiary Carbonate Sequences in Socotra Island, Yemen

Socotra adasında (Yemen) yüzlek veren'Tersiyer yaşlı sedimanter kayaçlarm depolanma ortamları ve mikrofasiyes analizleri üstünde detaylı bir çalışma yapılmıştır. Araştırma beş stratigrafik kesitten toplanan elli dört örnek, ve alttan üste Umm er Radhuma (Paleosen-Eosen), Dammam (Eosen), Aydim (Üst Eosen) ve Mughsayl (Oligosen-Miyosen) olmak üzere dört formasyona dayandırılmıştır. Bu kayaçlar başlıca karbonatlardan oluşmaktadırlar. Boyanmamış ve boyanmış ince kesitlerin petrografik çalışması kayaçlarm sedimantolojilerini, mikrofasiyes birliklerini ve depolanma ortamlarını araştırmak için yürütülmüştür. Dunham (1962)'nin kireçtaşı sınıflamasına göre sekiz karbonat fasiyesi ayırtlanmıştır. Bunlar çamurtaşı, dolomitik çamurtaşı/vaketaşı, fosilli vaketaşı, istiftaşı, marnlı kireçtaşı, kumlu kireçtaşı, resifal kireçtaşı, breşlemiş vaketaşı/istiftaşı ve tebeşirimsi kireçtaşıdır. Tanımlanan mikrofasiyes birlikleri Wilson (1975) ve Flügel (1982 ve 2005) tarafından önerilen standart mikrofasiyes birlikleriyle (SMBJ ilişkilendirilmiştir. Detaylı mikrofasiyes analizleri çalışılan kayaçlarm Mughsayl formasyonunun az derin deniz ortamında depolanan üst kesimleri hariç sığ deniz ortamında çökeldiğinigöstermektedir.

Socotra adasındaki tersiyer karbonat istifinin mikrofasiyes analizi ve çökel ortamları

A detailed study on the microfacies analysis and depositional environments of Tertiary sedimentary rocks exposed in Socotra Island were conducted. The investigation was based on fifty four samples collected from five stratigraphic sections and included four formations from base to top are Umm er Radhuma (Paleocene - Eocene], Dammam (Eocene), Aydim (Upper Eocene) and Mughsayl (Oligocene-Miocene). These rock units are mainly composed of carbonates. The petrographic study of unstained and stained thin sections have been carried out to investigate its sediment logy, microfacies associations and depositional environments. According to Dunham classification of limestone (1962), eight carbonate facies were distinguished. They are Mudstone, Dolomitic mudstone/wackestone, Fossiliferous wackestone, Packstone, Marly limestone, Sandy limestone, Reefal limestone, Brecciated wackestone/packstone and Chalky limestone. The recognized microfacies associations were correlated with the standard microfacies associations (SMA) which were supposed by Wilson (1975) and Flügel (1982 and 2005). The detailed microfacies analysis show that the studied rock units were deposited within the shallow marine environment except the upper parts of Mughsayl Formation, which were deposited in a slightly deep marine environment.
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Türkiye Jeoloji Bülteni-Cover
  • ISSN: 1016-9164
  • Başlangıç: 1947
  • Yayıncı: TMMOB Jeoloji Mühendisleri Odası
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Microfacies analysis and depositional environments of Tertiary Carbonate Sequences in Socotra Island, Yemen

Mohammed AL WOSABI, Ahmed AL AYDRUS