Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks

USTAÖMER, Timur; ROBERTSON, Alastair H.F.; USTAÖMER, P. Ayda

Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks

P. Ayda USTAÖMER, (Yıldız Teknik Üniversitesi, Doğa Bilimleri Araştırma Merkezi, İstanbul, Türkiye)

Timur USTAÖMER, (İstanbul Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, İstanbul, Türkiye)

Alastair H.F. ROBERTSON (University of Edinburgh, School of GeoSciences, West Mains Road, EH9 3JW Edinburgh, UK)

Turkish Journal of Earth Sciences

4 0

Yıl: 2012 Cilt: 21 Sayı: 6 Sayfa Aralığı: 905 - 932 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks

Öz:

Kuzeybatı Anadolu’daki önemli bir ‘temel’ yüzeylemesinde yeralan amfibolit fasiyesi meta-kırıntılı sedimenter kayalar ile bunları kesen granitoidik kayaların göreli yaşlarını saptamak için iyon prob yaşlandırması yapılmıştır. Orta Sakarya temelindeki bir sillimanit-granat mika şistden ayrılan 89 kırıntılı zirkon mineralinin U-Pb iyon-prob yaş tayini 551 My (Ediyakaran)’dan 2738 My (Neoarkeen)’a kadar yaşlar vermiştir. Elde edilen yaşların yüzde seksenbeşi %90– 110 konkordandır. Zirkon popülasyonları ~550–750 My (28 tane), ~950–1050 My (27 tane) ve ~2000 My (5 tane), daha küçük bir grup ise ~800 My ve ~1850 My’da kümelenmektedir. İlk, baskın popülasyon (geç Neoproterozoyik) Kadomiyen–Avalonya mağmatik yayı veya Doğu Afrika orojeni ile ilişkili bir kaynak alandan beslenmeyi yansıtır. Alternatif olarak Baltık kalkanı ile bir bağlantı çok zayıf bir olasılıktır. Çünkü Baltık kalkanı bu dönemin büyük bir bölümünde mağmatik açıdan pasif kalmıştır. Erken Neoproterozoyik yaşları (0.9–1.0 Gy), Kadomiyen bloklarındaki bilinen yaş aralığından önemli ölçüde sapma gösterir ve bunun yerine kuzeydoğu Afrika’nın bir bölümünden beslenme ile uyumludur. Bu çalışmadan elde edilen Sakarya temelinin taşınmış zirkon yaş aralığı, Arap-Nubiya Kalkanının kuzey kenarı boyunca birikmiş Kambriyen–Ordovisyen kumtaşlarına (Elat kumtaşları) aşırı derecede benzerlik sergiler. Orta Sakarya metamorfik temeli granitoyidik intrüzyonlar ile kesilir. Pembe, alkali feldspatca zengin bir granitoyid 324.3±1.5 My yaşı; gri, foliasyonlu biyotit granitoid 327.2±1.9 My yaşı vermiştir. Biyotit ve amfibol içeren bir diğer granitoyid kütlesinden ise 319.5±1.1 My yaşı elde edilmiştir. O nedenle, yitim veya Orta Sakarya blokunun Avrasya kenarına çarpışması ile ilişkili granitoyidik mağmatizmanın geç Erken Karbonifer döneminde ~8 My boyunca devam ettiği anlaşılmaktadır. Orta Sakarya bloku, Doğu Akdeniz bölgesindeki diğer ‘Minoan’ bloklarına göre daha önce, Erken Paleozoyik döneminde rift leşmiş ve daha sonra, olasılıkla Geç Paleozoyik döneminde Avrasya kenarına eklenmiş olmalıdır. Taşınmış zirkon topluluklarındaki farklılıklar, Orta Sakarya blokunun şu an bitişiğindeki İstanbul blokunun Alt Karbonifer kırıntılı sedimanları için bir kaynak alan oluşturmadığını, o nedenle bu iki tektonik birliğin Geç Paleozoyik–Erken Mesozoyik döneminde birbirlerinden oldukça uzak olduklarını göstermektedir.

Anahtar Kelime:

Konular: Jeoloji

Orta Sakarya temelinin iyon prob U-Pb yaşlandırması: Geç erken karbonifer yaşlı yitim/çarpışma ile ilişkili granitik mağmatizma ile kesilen gondwana-kenarı kökenli bir blok

Öz:

Ion probe dating is used to determine the relative ages of amphibolite-facies meta-clastic sedimentary rocks and crosscutting granitoid rocks within an important ‘basement’ outcrop in northwestern Turkey. U-Pb ages of 89 detrital zircon grains separated from sillimanite-garnet micaschist from the Central Sakarya basement terrane range from 551 Ma (Ediacaran) to 2738 Ma (Neoarchean). Eighty five percent of the ages are 90–110% concordant. Zircon populations cluster at ~550–750 Ma (28 grains), ~950–1050 Ma (27 grains) and ~2000 Ma (5 grains), with smaller groupings at ~800 Ma and ~1850 Ma. The first, prominent, population (late Neoproterozoic) reflects derivation from a source area related to a Cadomian-Avalonian magmatic arc, or the East African orogen. An alternative Baltica-related origin is unlikely because Baltica was magmatically inactive during much of this period. The early Neoproterozoic ages (0.9–1.0 Ga) deviate signifi cantly from the known age spectra of Cadomian terranes and are instead consistent with derivation from northeast Africa. The detrital zircon age spectrum of the Sakarya basement is similar to that of Cambrian–Ordovician sandstones along the northern periphery of the Arabian-Nubian Shield (Elat sandstones). A sample of crosscutting pink alkali feldspar-rich granitoid yielded an age of 324.3±1.5 Ma, whilst a grey, well-foliated biotite granitoid was dated at 327.2±1.9 Ma. A granitoid body with biotite and amphibole yielded an age of 319.5±1.1 Ma. The granitoid magmatism could thus have persisted for ~8 Ma during late Early Carboniferous time, possibly related to subduction or collision of a Central Sakarya terrane with the Eurasian margin. The Central Sakarya terrane is likely to have rifted during the Early Palaeozoic; i.e. relatively early compared to other Eastern Mediterranean, inferred ‘Minoan terranes’ and then accreted to the Eurasian margin, probably during Late Palaeozoic time. The differences in detrital zircon populations suggest that the Central Sakarya terrane was not part of the source area of Lower Carboniferous clastic sediments of the now-adjacent İstanbul terrane, consistent with these two tectonic units being far apart during Late Palaeozoic–Early Mesozoic time.

Anahtar Kelime:

Konular: Jeoloji

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık

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APA	USTAÖMER P, USTAÖMER T, ROBERTSON A (2012). Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. , 905 - 932.
Chicago	USTAÖMER P. Ayda,USTAÖMER Timur,ROBERTSON Alastair H.F. Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. (2012): 905 - 932.
MLA	USTAÖMER P. Ayda,USTAÖMER Timur,ROBERTSON Alastair H.F. Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. , 2012, ss.905 - 932.
AMA	USTAÖMER P,USTAÖMER T,ROBERTSON A Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. . 2012; 905 - 932.
Vancouver	USTAÖMER P,USTAÖMER T,ROBERTSON A Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. . 2012; 905 - 932.
IEEE	USTAÖMER P,USTAÖMER T,ROBERTSON A "Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks." , ss.905 - 932, 2012.
ISNAD	USTAÖMER, P. Ayda vd. "Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks". (2012), 905-932.

APA	USTAÖMER P, USTAÖMER T, ROBERTSON A (2012). Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. Turkish Journal of Earth Sciences, 21(6), 905 - 932.
Chicago	USTAÖMER P. Ayda,USTAÖMER Timur,ROBERTSON Alastair H.F. Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. Turkish Journal of Earth Sciences 21, no.6 (2012): 905 - 932.
MLA	USTAÖMER P. Ayda,USTAÖMER Timur,ROBERTSON Alastair H.F. Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. Turkish Journal of Earth Sciences, vol.21, no.6, 2012, ss.905 - 932.
AMA	USTAÖMER P,USTAÖMER T,ROBERTSON A Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. Turkish Journal of Earth Sciences. 2012; 21(6): 905 - 932.
Vancouver	USTAÖMER P,USTAÖMER T,ROBERTSON A Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks. Turkish Journal of Earth Sciences. 2012; 21(6): 905 - 932.
IEEE	USTAÖMER P,USTAÖMER T,ROBERTSON A "Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks." Turkish Journal of Earth Sciences, 21, ss.905 - 932, 2012.
ISNAD	USTAÖMER, P. Ayda vd. "Ion probe U-Pb dating of the Central Sakarya basement: A peri-gondwana terrane intruded by Late Lower Carboniferous subduction/collision-related granitic rocks". Turkish Journal of Earth Sciences 21/6 (2012), 905-932.