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K.MARAS TERSiYER iSTiFiNiN SEDiMENTER ÖZELLiKLERi VE ÇÖKELME ORTAMLARI

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ÖNALAN, Mehmet

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Sedimentary characters and depositional environmentsof K . Maras Terteariy sequence There is widespread Tertiary sedimentary sequence around K.Maras. One of the best outcrop of these sediments is seen bet.ween KilavuzluSiileymanfJ and Deniz area • .Stratigraphic sequences of the sediments are rather different in the southern and the northern part of this region. Ahtrdag1 mermer of the Midyat formation with Paleocene. Eocene, Oligocene and Miocene age situated at the bottom of sedimentary succession in the southern area. This cream colore~ member mostly consists of biomicrites. Lithology and fossil content such as foraminifera and Zoophycos of the member indicate that this unit is formed in shelf-basin slope environments. Fırat member which is formed by reefy limestone and Cac1k mermer that consisted of conglomerate, sandstone and limestone gradually overlie the Ahudag1 member. Lower i\liocenc Firat and Cac1k member accumulated in the reef and shore-lagoon environments resμectively • Midyat formation has been gradually covered by Lower Miocene Lice formation which is mostly constituded of shales. Also. the Lice formation contains soma limestone lences (Tunaboylu member) at the intermediate levels and reefal limestones (Athk member) at the upper levels. In south, lower levels of Lice formation had accumulated in shelf, middle levels had accumulated in basin slopes and basin, and upper levels had deposited in a shallow marine-reefal-lagooner environments. Pink Be~enli formation which consists of conglomerate, litharenite · and shale intercalation is situated in the eastern part of the region. This wait laterally and perpendicularly passes to the Lice formation and mostly had been formed by the braided river sediments. • Bertiz formation which is widespread in Maras Miocene basin and that passes to the Be~enli formation is subdivided to 1five members.a) Menzelet memper consists . of litharenite and mostlr algal biomicrites and it has deposited in a shallow shelf environment.b) Budakh member consists of limestone, litharenite and shale alternation and it has generally deposited in a shelf environment.c ) islampman member is mostly formed of shales and probably has de- posited in the slope of the basin and basin environments.d) ~ak1rdcre member consists of litharenite and shale alternation and probably has deposited in environments varying from basin through basin slope and deltaic envi ronrnents. ·e) Alikayası member contains litharenite and conglomerate intercalation and it probabiy represents submarine canyon sediment. Ktlavuzlu formation which is observed in the upper level of the autochthonaus units and are formed by sandstone shale and conglomerate intercalation, has mostly deposited in the braided river environment. Mesozoic Berit group whicla is formed by 011hiolitcs, schists and granitic rocks, and Permian ~lalatya ~ldharuorphic rocks that consists of limestones, calcschist, marble and schists exist al the base of the sedimentary sequence in the northern part of the study u rL:a. These tectonicly mixed allochthcinuus units are unconformably covered by Oal11k1s1k formation which contair1s con1:l1) ml·ratt~ , sandstone, limestone andandesitic volcanics. Upper Eocene llall1k1s1J.. lor111•iti un that has probably depo-. sited in at shallow.sea environment has b1.:cn unconformably covered by Abaz member of the Lice formation whid1 wnsists of derrital limestones. This unitis followed by the other units uf the l.i<..c lo rrnution which are accumulated in environments varying from basin sl ,1pcs to busin, and to reefal environments respectively. In the north of the basin, so met i 111es C'Olllinental sediments which are equivalent of the Be~enli formation lies uver the Lice formation. Toward the upper levels, the sequence continues with the units of the Ucrtiz formation. As a result, the sediments have formation in an asirnetric peripheral basinwhich has been developed by comincntal collision between .'\ rabian plate in the south and Torid platform in the no rth.In this basin, the facies distril:iutions in s01mce and time indicate that sediments developed with movements uf ;dludıthonous units belonging to the orog. enic belt thrusting over the platform of the subducting plate from time totime. Also, in the study area, position of the scdirnentary sequence and fasies distributions point out at least seven compression or trust movements since Upper Cretaceous in the region.

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