Element profiles and Ir concentration of Cretaceous-Tertiary (K-T) boundary layers at Medetli, Gölpazari, northwestern Turkey

Yoji Arakawa, Xiaolin Li, Mitsuru Ebihara, Engin Meriç, Izavel Tansel, Simau Bargu, Hayrettin Koral, Kuniteru Matsumaru

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Some element concentrations were measured and element profiles were made for the Cretaceous-Tertiary (K-T) boundary layers in Medetti, Gölpazari, northwestern Turkey. In Medetli region, gray-colored medium to coarse grained sandstone (layer A) is overlain by yellow-colored fine-grained sandstone with intercalated thin goethite-rich layers (layer B). White colored limestone (layer C) overlies on the layer B. The layer A is latest Cretaceous and layer C is early Paleocene, and in layer B (28-37 cm in thickness) fossils are absent, and is regarded as a K-T transitional layer. In several goethite-rich layers, siderophile elements such as Fe, Cr, Ni, Co, and chalcophile element, such as As, Sb, and Zn, are enriched, and have maximum in succession from layer A to C. The enrichment of these elements are common features in most of K-T boundary sediments of the world. However, Ir concentration is relatively low (0.05-0.10 ppb) in the goethite-rich layers. The analyzed Ir concentration is slightly elevated (0.24 ppb) only in the top part of layer A. Iridium may have been diluted during sedimentation and diagenesis. The actual K-T boundary may be situated between the top of layer A and the bottom of layer B. The section from the top part of layer A to layer B is assumed to have been formed during the K-T and its successive events.

Original languageEnglish
Pages (from-to)681-693
Number of pages13
JournalGeochemical Journal
Volume37
Issue number6
Publication statusPublished - 2003 Dec 1
Externally publishedYes

Fingerprint

Cretaceous-Tertiary boundary
Turkey
boundary layers
Boundary layers
boundary layer
Sandstone
profiles
Iridium
Calcium Carbonate
Sedimentation
Sediments
goethite
sandstones
siderophile elements
sandstone
siderophile element

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Element profiles and Ir concentration of Cretaceous-Tertiary (K-T) boundary layers at Medetli, Gölpazari, northwestern Turkey. / Arakawa, Yoji; Li, Xiaolin; Ebihara, Mitsuru; Meriç, Engin; Tansel, Izavel; Bargu, Simau; Koral, Hayrettin; Matsumaru, Kuniteru.

In: Geochemical Journal, Vol. 37, No. 6, 01.12.2003, p. 681-693.

Research output: Contribution to journalArticle

Arakawa, Y, Li, X, Ebihara, M, Meriç, E, Tansel, I, Bargu, S, Koral, H & Matsumaru, K 2003, 'Element profiles and Ir concentration of Cretaceous-Tertiary (K-T) boundary layers at Medetli, Gölpazari, northwestern Turkey', Geochemical Journal, vol. 37, no. 6, pp. 681-693.
Arakawa, Yoji ; Li, Xiaolin ; Ebihara, Mitsuru ; Meriç, Engin ; Tansel, Izavel ; Bargu, Simau ; Koral, Hayrettin ; Matsumaru, Kuniteru. / Element profiles and Ir concentration of Cretaceous-Tertiary (K-T) boundary layers at Medetli, Gölpazari, northwestern Turkey. In: Geochemical Journal. 2003 ; Vol. 37, No. 6. pp. 681-693.
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