Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events

İsmail Ömer YILMAZ (ODTÜ Müh. Fakültesi, Jeoloji Müh. Bölümü, Ankara, Türkiye)
Turkish Journal of Earth Sciences
8 0
Yıl: 2008 Cilt: 17 Sayı: 2 Sayfa Aralığı: 263 - 296 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events

Öz:
Türkiye’nin orta kuzeybatısında yeralan ve Göynük, Mudurnu ve Nallıhan yakınlarını kapsayan çalışma alanları Türkiye’nin Kretase jeolojisinin önemli tektonik dilimlerden biri olan Sakarya Kıtası üzerinde bulunmaktadır. Ölçülü stratigrafik kesitler Apsiyen pelajik karbonatlarını ve üzerine gelen Üst Santoniyen–Kampaniyen kırmızı tabakaları ile örtülmüş Albiyen–Koniyasiyen türbiditik istiflerini içermektedir. istiflerde tanımlanmış olan Alt ve Üst Apsiyen, Üst Albiyen ve Senomaniyen/Turoniyen denizel siyah şeyllerinin Alt ve Üst Apsiyen, Üst Albiyen ve Turoniyen denizel kırmızı tabakaları ile takip edildiği gözlenmiştir. Siyah şeyller genellikle siltli, laminalı ve piritleşmiş radyolarya ve planktonik foraminifer içermektedir. Kırmızı tabakalar ise bol planktonik foraminifera, bivalve, ekinid, demir doguları ve kaplamaları içeren istif taşı fasiyesindeki kırmızı-pembe renkli kireçtaşları ile bivalve kırıntıları, glakoni, demir ve kuvars içeren siltli kırmızı marnlardan oluşmaktadır. Bu çalışmada ölçülü kesitler boyunca incelenmiş olan siyah şeyllerin ve kırmızı tabakaların sedimentolojik, sekans stratigrafik ve devirsel stratigrafik özellikleri tespit edilmiş ve Fischer eğrileri çıkarılarak kontrolleri ve karşılaştırmaları yapılmıştır. Sekans stratigrafik pozisyonları ve devirsel stratigrafik yapıları siyah şeyllerin genellikle erken transgresif sistemlerde çökeldiği fakat kırmızı tabakaların ise geç transgresif/yüksek duruş sistemleri temsil ettiğini göstermektedir. Yer yer, Üst Santoniyen kırmızı tabakalarının boğulma olayları ile ilişkili oldukları ve Tip-3 sekans sınırlarını üzerledikleri görülmüştür. Sedimantolojisi ve stratigrafik konumları havza içerisindeki kayıtlanmış okyanusal olayların ve tektonik hareketlerin daha iyi anlaşılmasında kullanılmıştır. Tespit edilmiş olan siyah şeyller ve kırmızı tabakalar küresel eşlenikleri ile benzer biyostratigrafik aralıklarda gözlenmiştir.
Anahtar Kelime:

Konular: Jeoloji

Kretase pelajik kırmızı tabakaları ve siyah şeylleri (Apsiyen–Santoniyen),kuzey batı Türkiye: Küresel anoksik ve oksik olaylar

Öz:
The study areas located near the towns of Göynük, Mudurnu and Nallıhan in the central northwestern part of Turkey lie on the `Sakarya Continent´, which is one of the tectonic entities of the Cretaceous geology of Turkey. Measured stratigraphic sections comprise the Aptian pelagic carbonates and the overlying Albian-Coniacian turbiditic sequences, which are all capped by a Late Santonian red pelagic succession. Lower and Upper Aptian, Upper Albian and Cenomanian/Turonian marine black shales recognized in the sections are followed by Lower and Upper Aptian, Upper Albian and Turonian marine red beds. The black shales are generally silty, laminated, and include pyritized radiolarian and planktonic foraminifera. The red beds are composed of red-pink limestones, which are of packstone facies with abundant planktonic foraminifera, bivalve, echinoidea, iron infillings and coatings. They also include red silty marls with quartz, iron and glauconite minerals as well as bivalve fragments. Sedimentologic, sequence stratigraphic and cyclostratigraphic properties of black shales and red beds recorded along the measured stratigraphic sections have been determined and Fischer plot analysis has been applied for their correlation and coherency. Their sequence stratigraphic positions and cyclic nature indicate that black shales were generally deposited in the early transgressive system tracts. However, red beds represent the late transgressive/high-stand systems tracts. In some areas, the Upper Santonian red beds are observed in association with a drowning event and overlie a Type-3 sequence boundary. Their stratigraphic position and sedimentology are used to better understand the oceanic events and tectonic movements recorded in this basin. These black shales and red beds are recognized within coeval biostratigraphic intervals as in their global counterparts
Anahtar Kelime:

Konular: Jeoloji
Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA YILMAZ İ (2008). Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. , 263 - 296.
Chicago YILMAZ İsmail Ömer Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. (2008): 263 - 296.
MLA YILMAZ İsmail Ömer Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. , 2008, ss.263 - 296.
AMA YILMAZ İ Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. . 2008; 263 - 296.
Vancouver YILMAZ İ Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. . 2008; 263 - 296.
IEEE YILMAZ İ "Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events." , ss.263 - 296, 2008.
ISNAD YILMAZ, İsmail Ömer. "Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events". (2008), 263-296.
APA YILMAZ İ (2008). Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. Turkish Journal of Earth Sciences, 17(2), 263 - 296.
Chicago YILMAZ İsmail Ömer Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. Turkish Journal of Earth Sciences 17, no.2 (2008): 263 - 296.
MLA YILMAZ İsmail Ömer Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. Turkish Journal of Earth Sciences, vol.17, no.2, 2008, ss.263 - 296.
AMA YILMAZ İ Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. Turkish Journal of Earth Sciences. 2008; 17(2): 263 - 296.
Vancouver YILMAZ İ Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events. Turkish Journal of Earth Sciences. 2008; 17(2): 263 - 296.
IEEE YILMAZ İ "Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events." Turkish Journal of Earth Sciences, 17, ss.263 - 296, 2008.
ISNAD YILMAZ, İsmail Ömer. "Cretaceous pelagic red beds and black shales (Aptian-Santonian), NW Turkey: Global oceanic anoxic and oxic events". Turkish Journal of Earth Sciences 17/2 (2008), 263-296.
Sayfa Oluşturulma Tarihi
09-05-2024 16:5

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