Doctoral thesis

Étude minéralogique et pétrographique de la région située à l’est de Çelikhan (Taurus Oriental, Turquie)

ContributorsÖzkan, Pişkin
DirectorsVuagnat, Marc
Number of pages152
Imprimatur date1972-07-13

The region under study is situated in the Taurus mountain range, approximately 30 kilometers East of the town of Celikhan, in the department of Adiyaman. This region belongs to the overthrust zone which separates the Taurides from the border folds.

The rocks encountered in the region are of metamorphic, monzodiorit,ic and ophiolitic nature, with their associated sediments. Younger sediments of Tertiary age are well represented.

The metamorphic basement, of probable Paleozoic age, is the core of the Eastern Taurus range. In the region under study, it shows a prealpine metamorphism of green schist to amphibolite facies. This basement is intruded by rocks of acid, intermediate and basic composition. It is overthrusted over Tertiary sediments towards the South.

A circumbscribed, fairly heterogeneous and posttectonic monzodioritic stock of pre-Lutetian age is rich in inclusions which belong partly to the basement and are partly of unknown origin. The inclusions are of melamonzonitic, melamonzodioritic, dioritic, meladioritic and ultrabasic (phlogopite-bearing) composition.

The presence of a biotite-rich zone is noticeable in the metamorphic rocks at the contact with the intrusive rocks mentioned above. This contact zone is approximately 20 meters wide.

The ophiolitic suite, which was studied in detail, is formed of ultrabasic rocks, gabbro-diorites and diabases, with their associated rocks.

Harzburgites, lherzolites, wehrlites, pyroxenites and serpentinites are the main rock types of ultrabasic nature. In the northeastern part of the region under study, relatively weakly serpentinized harzburgites and wehrlites are associated with ortho-amphibolites. These ortho-amphibolites can be interpreted as older intrusive rocks of intermediate to basic composition which originate from the Upper mantle in association with the ultrabasites, or as rocks which have been transformed with the basement during a Pal eozoic phase of regional metamorphism in the amphibolite facies.

In the southern part of the region under study, the serpentinisation is more advanced, and rodingitic inclusions are frequent. These inclusions are probably formed from gabbros through calcic metasomatic processes which took place during the serpentinisation phase. Prehnite, hydrogarnet, clinopyroxene, actinote and chlorite are characteristic minerals in the rodingites.

Gabbro-diorites are the rarest rocks belonging to the ophiolitic suite and are found only in the southern part of the region.

Diabases (pillow lavas and dykes) and their associated rocks (particularly diabase breccias, locally devitrified hyaloclastites and tuffs) are extremely common. The dykes could be interpreted as the filling of fissures through which the submarine lavas reached the sea bottom.

Geological evidence seems to indicate that the volcanic activity took place in two main phases of Upper Cretaceous and Lower Eocene age. The sediments deposited after the first submarine volcanic phase are not fossiliferous, and thus their age remains unknown. However, the volcano-sedimantary complex is similarto other ophiolitic sequences of probable Upper Cretaceous age well known in other parts of Turkey.

The second phase of volcanic activity took probably place at the time of deposition of Lower Eocene sediments, transgressing on those deposited after the first volcanic phase. (...)

Citation (ISO format)
ÖZKAN, Pişkin. Étude minéralogique et pétrographique de la région située à l’est de Çelikhan (Taurus Oriental, Turquie). 1972. doi: 10.13097/archive-ouverte/unige:172828
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