Geochemistry and Significance of Mafic Dyke Swarms in the Pozantı-Karsantı Ophiolite (Southern Turkey)

Osman PARLAK

Makale detayları

Geochemistry and Significance of Mafic Dyke Swarms in the Pozantı-Karsantı Ophiolite (Southern Turkey)

Yazarlar:

Osman PARLAK

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2000 Vol.9 Issue 1, pp.29-38

Belge Tipi:

Makale

Yayın Tarihi:

12/1999

Belge Dili:

Türkçe

Document ID (Org No.):

2000732975

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985

Özet:

 

The Pozantı-Karsantı ophiolite, which is one of a number of the Late Cretaceous oceanic lithospheric  remnants in southern Turkey, is situated in the eastern Tauride belt and consists of three distinct thrust sheets: an  ophiolitic melange, a metamorphic sole, and an ophiolitic stratigraphic sequence. These units (except the ophiolitic  melange) are intruded by isolated microgabbro-diabase dykes at all structural levels. The dykes from the lower  crustal rocks (cumulates) are subalkaline in character and chemically similar to island arc tholeiitic basalts and  basaltic andesites. They are enriched in some LIL elements (Rb, Ba, K and Sr) and depleted in HFS elements (Nb,  Ti, Y) relative to N-MORB. The presence of positive Th and LIL anomalies and a negative Nb anomaly, relative to  the other incompatible elements, are thought to represent a subduction zone component. Tectonomagmatic  discrimination diagrams based on the immobile trace elements suggest a suprasubduction zone environment for  the origin of the mafic dyke swarms. All the evidence indicates that the mafic dykes from the lower crustal rocks  (cumulates) in the Pozantı-Karsantı ophiolite formed in the same geodynamic environment (suprasubduction zone)  as their host rocks did in the north of Tauride-Anatolide block during Late Cretaceous in the Neo-Tethyan ocean.

 

The Pozantı-Karsantı ophiolite, which is one of a number of the Late Cretaceous oceanic lithospheric  remnants in southern Turkey, is situated in the eastern Tauride belt and consists of three distinct thrust sheets: an  ophiolitic melange, a metamorphic sole, and an ophiolitic stratigraphic sequence. These units (except the ophiolitic  melange) are intruded by isolated microgabbro-diabase dykes at all structural levels. The dykes from the lower  crustal rocks (cumulates) are subalkaline in character and chemically similar to island arc tholeiitic basalts and  basaltic andesites. They are enriched in some LIL elements (Rb, Ba, K and Sr) and depleted in HFS elements (Nb,  Ti, Y) relative to N-MORB. The presence of positive Th and LIL anomalies and a negative Nb anomaly, relative to  the other incompatible elements, are thought to represent a subduction zone component. Tectonomagmatic  discrimination diagrams based on the immobile trace elements suggest a suprasubduction zone environment for  the origin of the mafic dyke swarms. All the evidence indicates that the mafic dykes from the lower crustal rocks  (cumulates) in the Pozantı-Karsantı ophiolite formed in the same geodynamic environment (suprasubduction zone)  as their host rocks did in the north of Tauride-Anatolide block during Late Cretaceous in the Neo-Tethyan ocean.

Makale detayları

Geochemistry and Significance of Mafic Dyke Swarms in the Pozantı-Karsantı Ophiolite (Southern Turkey)

Yazarlar: Osman PARLAK

Yayıncı: TUBITAK

Dergi: Turkish Journal of Earth Sciences 2000 Vol.9 Issue 1, pp.29-38

Belge Tipi: Makale

Yayın Tarihi: 12/1999

Belge Dili: Türkçe

Document ID (Org No.): 2000732975

Sıklık: İki Aylık

eISSN: 1303-619X

pISSN: 1300-0985

Sayı

Yazarlar:

Osman PARLAK

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2000 Vol.9 Issue 1, pp.29-38

Belge Tipi:

Makale

Yayın Tarihi:

12/1999

Belge Dili:

Türkçe

Document ID (Org No.):

2000732975

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985