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The Pertek Granitoid, Taurus Orogenic Belt, Turkey

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The Pertek Granitoid, Taurus Orogenic Belt, Turkey International Journal of Geosciences, 2011, 2, 214-226 doi:10.4236/ijg.2011.23023 Published Online August 2011 (http://www.SciRP.org/journal/ijg) An Example for Arc-Type Granitoids along Collisional Zones: The Pertek Granitoid, Taurus Orogenic Belt, Turkey Sevcan Kürüm1*, Bünyamin Akgül1, Ayten Öztüfekçi Önal2, Durmuş Boztuğ2, Yehudit Harlavan3, Melek Ural1 1University of Fırat, Engineering Faculty, Department of Geleogy, Elazığ, Turkey 2University of Tunceli, Engineering Faculty, Department of Geleogy, Tunceli, Turkey 3Geological Survey of Israel, Jerusalem, Israel E-mail: *[email protected] Received April 5, 2011; revised June 8, 2011; accepted July 14, 2011 Abstract The Pertek granitoid consisting dominantly of diorite, quartz diorite, quartz monzodiorite, tonalite and lesser granite, adamellite and syenite, is considered to form the easternmost continuation of the Central Anatolian Crystalline Complex. Diorite and monzonites of this granitoid complex are cut by the granitic dykes. The Pertek granitoid, in the study area, is found in the Permo-Triassic Keban metamorphic sequence along intru- sive and tectonic contacts. Along the intrusive contacts metasomatic mineralizations are common. Granitoids are, depending on the mineralogical composition, low-, middle- high-K subalkaline features. Major oxide- SiO2 variation diagrams show that fractionation (particularly plagioclase, hornblend, pyroxene and olivine fractionation) played an important role on the granitoid formation during a continuous crystallization process. Distribution of the samples from the Pertek granitoid in the tectonic setting diagrams, and their chondrite- and primordial mantle-normalized trace element patterns resemble to the of arc-type granitoids. Trace element and rare earth element compositions indicate that the magma, from which the Pertek granitoid crystallized, derived from a mantle that was enriched by the fluids derived from the subducted slab, however this magma was contaminated by the crust during its intrusion. These geochemical characteristics are also supported by the field observations. The field and geochemical characteristics of the Pertek Granitiod suggest that they are similar to the other granitoids cropping out in the central and eastern Anatolia and they form the lateral continuation of the same magmatic belt. Keywords: Pertek, Tunceli, Island Arc, Granitoid, Geochemistry 1. Introduction Baskil-Keban (Elazığ) granitoids have been studied in detail and results have been published [5-17,3,18]. E-SE Anatolia Orogenic Belt was formed along the colli- The Pertek granitoid, in a similar fashion to the other sion zone between Afro-Arabic and Aurasian plates during granitoids along this belt, show intrusive contacts with the Middle Miocene [1,2]. Palaeozoic-Mesozoic platform- the Palaeozoic-Mesozoic Keban metamorphics (Keban type carbonates, supra-subduction zone ophiolites and platform-type carbonates). Platform-type carbonates were granitoids are found together and form the tectono- thrust onto the granitoids by the Eocene aged and younger magmatic unites of this belt. Isotopically dated granitoids tectonic activity to form the tectonic contact observed of this belt yield a Cretaceous-Eocene age [3,4,2]. These between the granitoids and the older metamorphic se- granitoids are considered to be formed along the south- quence [19]. Both the basement units and the Pertek ern Neo-Tethyan subduction in the larger-scale Neo- Granitoid, in the study area, are overlain by the Teriary Tethyan Conversion System and expose in three different marine sediments, terrestrial volcanic rocks and equiva- areas. From west to east, in the collision zone, Afşin- lent terrestrial sediments [20] (Figure 1). Elbistan (Kahramanmaraş), Doğanşehir (Malatya) and In this study, field occurences, petrographical and geo- Copyright © 2011 SciRes. IJG S. KÜRÜM ET AL. 215 Figure 1. Location map of the study area and Geological map of the Pertek granitoid (simplified) [21]. chemical characteristics of the Pertek granitoid are between Keban and Arabic microcontinents that started documented for the first time. Results of this study will in Late Cretaceous-Early Mastrichtian and continued discuss the tectonic setting and source of the magmatic until Early Eocene. Magmatic rocks observed in this rocks in the area and contribute to the understanding of orogenic belt formed along an arc that developed on the geological evolution of the region. This contribution oceanic and continental crust in Malatya Province and would also explain to the future researchers that using westward [22,6]. A number of researchers [8,1,9,12,4,14] only geochemical data in order to evaluate the geological documented that this magmatic belt consists of calc- evolution of the region may result in erroneous inter- alkaline volcanic and plutonic rocks. pretations. Palaeozoic-Mesozoic Keban metamorphics form the oldest units in the study area. The Keban metamrophics 2. Analytical Techniques consist of marble, chalk schist and amphibolites and bound the magmatic rocks along their northern side The geological maps [21] covering the area where Pertek (Figure 1) in the studey area. Kipman [23], suggested granitoid crops out were used in this study and they were that the Keban metamorphics are Jurassic-Early Creta- revised whenever needed. Samples were taken from ceous in age and metamorphosed under low P-T con- different rock units in relatively fresh parts of the units. ditions. Yazgan [22] on the other hand suggested that the Of those, 45 samples were examined under polirizan platform-type carbonates in this metamorphic sequence microscope. Totally 34 samples were geochemically an- metamorphosed under gren schist methamorphism con- alysed 29 of them in ACME Laboratories (Canada) and 5 ditions during Senomanian along the subducion zone. of them in ACTLAB (Canada) and their major element Özgül and Turşucu [24] also suggested green schist oxide, trace element and rare earth element contents were conditions for the metamrophism of the Keban meta- determined. morphics supporting Yazgan’s view [22]. Some resear- chers [6,9] on the other hand proposed that the arc 3. Regional Geology magmatism caused the metamorphism. Intrusive contact between the arc magmatics and metamorphics and mine- SE Anatolian Orogenic Belt was controlled by the opening ralizations along this intrusive contact has been pre- of southern branch of the Neo-Tethys Ocean from Late viously documented by various researchers. [22,10,18, Triassic to Early Cretaceous between the Keban Paltform 25]. and Pütürge metamorphics [22] and following northward The Pertek granitoid crops widely crop out in the subduction under the Keban Plate during Senomanian- northern and southern part of the Keban Dam to the Turonian. Yazgan and Chessex [8] suggested that Eastern north of Elazığ. The Pertek granitoid is overlain by the Tauride tectonism developed as an arc-continent collision Eocene-Oligocene marine sediments and Miyo-Pliocene Copyright © 2011 SciRes. IJG 216 S. KÜRÜM ET AL. terrestrial volcanic and sedimentary sequences. of the study area. The thrust fault along which the Keban metamorphics 4. Field Characteristics are found tectonically overlying the Pertek magmatics, form the main tectonic structure in the study area The Pertek pluton crops out widely along two opposite (Figure 1). [19] suggested that this approximetely 10° sides of the Keban Dam Lake situated to the North of north dipping fault is Late Cretaceous - Late Palaeocene Elazığ, therefore appears like two different plutons in the in age. NW-SE trending strike-slip fault which is observed field. In this study is focused on the northern side of the in the west of Pertek, is another significant tectonic dam lake (Figure 1) where the magmatic rocks consist of structure in the area (Figure 1). diorite-gabbro, quartz diorite, tonalite, monzonites and cross-cutting dykes of acidic composition. These diffe- 5. Petrography rent units are not indicated in geological map, however diorites crop out widely along the study area, whreas Petrographically the Pertek granitoid consists of quartz tonalites have wide outcrops in western parts of the study diorite, tonalite-granite/granodiorite, monzonite, diorite/ area. Monzonites, on the other hand, volumetrically do- gabbro. Samples are dominantly plotted in quartz diorite, minates the outcrops to the south of Pertek. diorite quartz monzodiorite and tonalite areas in nomen- In the field, diorites are weathered, medium-grained, clature diagram [26] and only one sample is found in competent, dark gray-black in appearence and form a granite, ademellite and syenite areas respectively (Figure smooth topography. Tonalites consist of large quartz 2). Places of the samples in the geochemical nomen- crystals, less amount of mafic minerals and more mafic clature diagrams are in accordance with the petrographic microgranular enclaves (MME). To the west of Pertek, nomenclature. Sample PR-20 is plotted in the geoche- close to the carbonates of the surrounding metamorphic mical nomenclature diagram in granite area, PR-31 in association, strong hydrothermal alteration and oxidi- syenite area and PR-26 in ademellite area and they are zation in mafic minerals are common. Prolonged amphi- found in Streckeisen [27] triangle diagram in monzo- boles which are found along the intrusive contacts may granite area. indicate a skarn zone. Presence of skarn metamorphism Diorites and quartz diorites are fine to medium grained in the region has previously been noted by Altunbey and
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