THE GEOLOGICAL EVOLUTION OF SORGUN (YOZGAT)-YILDIZELİ (SİVAS) FORELAND BASIN, PETROGRAPHIC, GEOCHEMICAL ASPECTS AND GEOCHRONOLOGY OF VOLCANISM AFFECTING THE BASIN

Ali Ekber AKÇAY; Metin BEYAZPİRİNÇ

doi:https://doi.org/10.19111/bulletinofmre.336625

Makale detayları

THE GEOLOGICAL EVOLUTION OF SORGUN (YOZGAT)-YILDIZELİ (SİVAS) FORELAND BASIN, PETROGRAPHIC, GEOCHEMICAL ASPECTS AND GEOCHRONOLOGY OF VOLCANISM AFFECTING THE BASIN

Yazarlar:

Ali Ekber AKÇAY | Metin BEYAZPİRİNÇ

Yayıncı:

Maden Tetkik Arama Genel Müdürlüğü

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Bulletin of the Mineral Research and Exploration 2017 Vol.155 Issue 155, pp.1-31

Belge Tipi:

Makale

Yayın Tarihi:

12/2017

Belge Dili:

İngilizce

Document ID (Org No.):

2000520095

Sıklık:

Üç Yıllık

pISSN:

0026-4563

DOI:

https://doi.org/10.19111/bulletinofmre.336625

Özet:

 


Sorgun-Yıldızeli basin is an east-west trending asymmetric marginal foreland (peripheral foreland
basin) formed as a result of the consumption of oceanic crust of the northern branch of Neotethys due
to the collision of Sakarya continent in the north and Kırşehir Block in the south. It provides much
information about the geodynamic evolution of the region. The basement of the study area consists of
Late Palaeozoic-Mesozoic Akdağmadeni Massif. Akdağmadeni Massif was intruded by CenomanianMaastrichtian
granitoids and is overlain tectonically by Late Cretaceous Artova ophiolitic melange
within the İzmir-Ankara-Erzincan suture zone and by Cenomanian-Maastrichtian Darmik Formation.
The volcano-sedimentary sequence deposited in Sorgun-Yıldızeli foreland basin developed on the relicts
of the İzmir-Ankara-Erzincan Suture Zone along the northern margin of Kırşehir Block and was named
the Boğazköy Formation. The pelitic, clastic and coarse clastic levels of Upper Palaeocene-Middle
Eocene Boğazköy Formation including İzmir-Ankara-Erzincan Suture Zone slices and olistostromes
are differentiated as the Dolak member. Toward the inner part of the basin, a turbiditic sequence of
conglomerate, sandstone, claystone including rare limestone beds was deposited, consisting of
conglomerate, sandstone, claystone, rarely limestone and alternations of three different volcanic rocks
(acidic, basic and intermediate) related to subduction and/or collision. Calc-alkaline lava and pyroclastics
of basaltic and basalt-andesite composition were differentiated as the Pazarcık volcanic member, with
lava and pyroclastics of dacitic and rhyolitic composition called the Sarayözü volcanic member and calcalkaline
lava and pyroclastics of andesitic, trachyandesitic and dacitic composition called Kiremitlik
volcanic member in Sorgun-Yıldızeli basin. According to the 40Ar/39Ar geochronologic method, the
ages of 57.2±2.0 Ma and 56.7±1.8 Ma were obtained for Pazarcık volcanics, 48.8±1.5 Ma for Sarayözü
volcanics and 45.1±1.3 Ma and 47.3±0.6 Ma for Kiremitlik volcanics. The reefal limestones which are
not thick and occur in higher parts of the Boğazköy Formation were called the Limestone member. The
uppermost section of the sequence which consists of generally clastic and coarse clastics is named the
Konacı member. When the sedimentation and volcanism continued in the basin, gabbroic intrusions
occurred as sills and laccoliths cutting the Boğazköy Formation. These gabbroic rocks were named
the Yaycılar Gabbro. The age of 51.0 ± 0.7 Ma was found for the Yaycılar Gabbro with the 40Ar/39Ar
geochronologic method. As a result of slab breakoff, the relicts of the consumed oceanic crust and
the released massif were uplifted rapidly and the units of Middle-Late Eocene Tokuş Formation were
deposited transgressively on the Boğazköy Formation and on outcropping basement rocks in the basin
which was controlled by an extensional tectonic regime. Upper Miocene-Pliocene (İncesu Formation),
Pliocene and Quaternary terrestrial sediments were deposited unconformably on all older units.


.

 

Sorgun-Yıldızeli basin is an east-west trending asymmetric marginal foreland (peripheral foreland basin) formed as a result of the consumption of oceanic crust of the northern branch of Neotethys due to the collision of Sakarya continent in the north and Kırşehir Block in the south. It provides much information about the geodynamic evolution of the region. The basement of the study area consists of Late Palaeozoic-Mesozoic Akdağmadeni Massif. Akdağmadeni Massif was intruded by CenomanianMaastrichtian granitoids and is overlain tectonically by Late Cretaceous Artova ophiolitic melange within the İzmir-Ankara-Erzincan suture zone and by Cenomanian-Maastrichtian Darmik Formation. The volcano-sedimentary sequence deposited in Sorgun-Yıldızeli foreland basin developed on the relicts of the İzmir-Ankara-Erzincan Suture Zone along the northern margin of Kırşehir Block and was named the Boğazköy Formation. The pelitic, clastic and coarse clastic levels of Upper Palaeocene-Middle Eocene Boğazköy Formation including İzmir-Ankara-Erzincan Suture Zone slices and olistostromes are differentiated as the Dolak member. Toward the inner part of the basin, a turbiditic sequence of conglomerate, sandstone, claystone including rare limestone beds was deposited, consisting of conglomerate, sandstone, claystone, rarely limestone and alternations of three different volcanic rocks (acidic, basic and intermediate) related to subduction and/or collision. Calc-alkaline lava and pyroclastics of basaltic and basalt-andesite composition were differentiated as the Pazarcık volcanic member, with lava and pyroclastics of dacitic and rhyolitic composition called the Sarayözü volcanic member and calcalkaline lava and pyroclastics of andesitic, trachyandesitic and dacitic composition called Kiremitlik volcanic member in Sorgun-Yıldızeli basin. According to the 40Ar/39Ar geochronologic method, the ages of 57.2±2.0 Ma and 56.7±1.8 Ma were obtained for Pazarcık volcanics, 48.8±1.5 Ma for Sarayözü volcanics and 45.1±1.3 Ma and 47.3±0.6 Ma for Kiremitlik volcanics. The reefal limestones which are not thick and occur in higher parts of the Boğazköy Formation were called the Limestone member. The uppermost section of the sequence which consists of generally clastic and coarse clastics is named the Konacı member. When the sedimentation and volcanism continued in the basin, gabbroic intrusions occurred as sills and laccoliths cutting the Boğazköy Formation. These gabbroic rocks were named the Yaycılar Gabbro. The age of 51.0 ± 0.7 Ma was found for the Yaycılar Gabbro with the 40Ar/39Ar geochronologic method. As a result of slab breakoff, the relicts of the consumed oceanic crust and the released massif were uplifted rapidly and the units of Middle-Late Eocene Tokuş Formation were deposited transgressively on the Boğazköy Formation and on outcropping basement rocks in the basin which was controlled by an extensional tectonic regime. Upper Miocene-Pliocene (İncesu Formation), Pliocene and Quaternary terrestrial sediments were deposited unconformably on all older units.


.

Makale detayları

THE GEOLOGICAL EVOLUTION OF SORGUN (YOZGAT)-YILDIZELİ (SİVAS) FORELAND BASIN, PETROGRAPHIC, GEOCHEMICAL ASPECTS AND GEOCHRONOLOGY OF VOLCANISM AFFECTING THE BASIN

Yazarlar: Ali Ekber AKÇAY | Metin BEYAZPİRİNÇ

Yayıncı: Maden Tetkik Arama Genel Müdürlüğü

Ana Başlıklar: Uygulamalı fizik

Dergi: Bulletin of the Mineral Research and Exploration 2017 Vol.155 Issue 155, pp.1-31

Belge Tipi: Makale

Yayın Tarihi: 12/2017

Belge Dili: İngilizce

Document ID (Org No.): 2000520095

Sıklık: Üç Yıllık

pISSN: 0026-4563

DOI: https://doi.org/10.19111/bulletinofmre.336625

Sayı

Yazarlar:

Ali Ekber AKÇAY | Metin BEYAZPİRİNÇ

Yayıncı:

Maden Tetkik Arama Genel Müdürlüğü

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Bulletin of the Mineral Research and Exploration 2017 Vol.155 Issue 155, pp.1-31

Belge Tipi:

Makale

Yayın Tarihi:

12/2017

Belge Dili:

İngilizce

Document ID (Org No.):

2000520095

Sıklık:

Üç Yıllık

pISSN:

0026-4563

DOI:

https://doi.org/10.19111/bulletinofmre.336625