The geochemical and Sr–Nd isotopic characteristics of Eocene to Miocene NW Anatolian granitoids: Implications for magma evolution in a post-collisional setting

Çelebi, Dağhan; Köprübaşı, Nezihi

doi:10.1016/j.jseaes.2014.07.037

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…Comparison of isotope results to age data from the GAG and other intrusion bodies indicates that ( 87 Sr/ 86 Sr) i values increase with decreasing age of intrusions from 50 to 17 Ma and then decreases as the age become younger. Increasing values of ( 87 Sr/ 86 Sr) i can be attributed to (1) enrichment of the subcontinental lithospheric mantle due to continuous subduction of the Neo‐Tethyan oceanic plate beneath the central Iranian micro‐continent (Honarmand et al, ; Rezaei‐Kahkhaei et al, ) during Lower Eocene to Middle Miocene; (2) the effect of increasing crustal contamination (Çelebi & Köprübası, ); (3) assimilation of the crustal components having more radiogenic Sr during differentiation with increasing crustal thickness (Hildreth & Moorbath, ); (4) and a change in the source from mantle to lower crust (Rezaei‐Kahkhaei et al, ). Gheshlagh–Aftabrow, Khalkhab–Neshveh, Zafarghand, and Kerman granitoids show juvenile granitoids signatures, such as positive values of εNd (t) and T DM between 1,000 and 500 Ma, with high 143 Nd/ 144 Nd and low 87 Sr/ 86 Sr ratios.…”

Section: Resultsmentioning

confidence: 99%

Role of magma mixing in generating of the Gheshlagh–Aftabrow intrusions, SW Buin Zahra, Iran: Evidence for a juvenile origin from geochemical and Sr–Nd isotopic data

et al. 2018

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In this paper, we investigate host granodiorites and associated mafic microgranular enclaves (MMEs), including gabbroic to quartz diorite enclaves from the Middle Eocene Gheshlagh-Aftabrow granitoid, to assess magma mixing and crust-mantle interaction in the Urumieh-Dokhtar magmatic arc. The host granodiorites yield zircon U-Pb ages of ca. 40 Ma. Geochemical and bulk rock Nd-Sr isotopic modelling, together with the widespread occurrence of mafic microgranular enclaves with ellipsoidal and spherical shapes and chilled margins, K-feldspar and plagioclase megacrysts in the enclaves, and the presence of acicular apatite, ocellar quartz, plagioclase with oscillatory zoning and resorption surfaces, suggests that the mafic microgranular enclaves are globules of a more mafic magma derived from the mantle that was injected into and mixed/mingled with the magma derived from partial melting of a lower crust. Geochemically, the granitoid rocks are high-K calc-alkaline and metaluminous (A/CNK = 0.87-0.92) and belong to I-type suite. These granitoid host rocks have much higher SiO 2 (65.4-67.3 wt%) and relatively low Fe 2 O 3 (1.8-2.1 wt%) and MgO (1-1.58 wt%), so compared with the host rocks, the mafic microgranular enclaves have much lower SiO 2 contents (50.5-55 wt%), considerably higher Fe 2 O 3 (3.4-4.2 wt%) and MgO (3.9-4.8 wt%). Both the host intrusion and enclaves are enriched in LREE relative to HREEs (LREE/HREE = 3.1-4.1; (La/Yb) N = 2.1-4.1) and show slightly negative Eu anomalies (δEu = 0.75-0.90) and nearly flat HREE patterns ((Gd/Yb) N = 0.86-1.26). Analyses of Sr-Nd isotopes in the host granodiorites and associated enclaves show ( 87 Sr/ 86 Sr) i host = 0.705070-0.705174, εNd (t) host = 0.21-2.31, T DM1 host = 782-983 Ma, ( 87 Sr/ 86 Sr) i enclave = 0.704997-0.705170, εNd (t) enclave = 2.15-2.17, and T DM1 enclave = 874-980 Ma, indicating of juvenile nature for these granites. This characteristic together with similar trace-element compositions indicates intense magma mixing and a high degree of geochemical equilibration between the host granodiorites and their enclaves.A binary mixing model based on Sr-Nd isotopic compositions of the GAG indicates that rocks were mostly generated by mixing of 7-12% melts produced by partial melting of meta-igneous old lower crust rocks with 88-93% contribution of mantlederived juvenile basaltic magmas.The Gheshlagh-Aftabrow granodiorites (GAG) in central Urumieh-Dokhtar magmatic arc (UDMA) are characterized by the presence of mafic-intermediate microgranular enclaves (MMEs). In this paper, we present field relationships, petrographic descriptions, major-and trace-element compositional and textural disequilibrium features of some minerals (e.g., plagioclase), with geochemical and Rb-Sr isotopic data for the granodiorite hosts and associated MMEs of the Gheshlagh-Aftabrow intrusive rocks in order to unravel their respective source characteristics and petrogenesis and to contribute to a better understanding of magma mixing/mingling processes.

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Section: Resultsmentioning

confidence: 99%

Role of magma mixing in generating of the Gheshlagh–Aftabrow intrusions, SW Buin Zahra, Iran: Evidence for a juvenile origin from geochemical and Sr–Nd isotopic data

et al. 2018

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“…6b). The Orhaneli pluton, however, comprises diorite, granodiorite, granite, syenite, monzonite and quartz-monzonite, whereby quartz-monzonite occurs as dikes (e.g., Altunkaynak et al, 2012;Çelebi and Köprübaşı, 2014;Özyurt and Altunkaynak, 2020).…”

Section: The Western Tavşanlı Zone Plutonsmentioning

confidence: 99%

“…However, rocks of the Orhaneli Pluton display a wide-ranging chondrite-normalized La/Yb ratios (5-84) and Eu anomalies (Eu/Eu* = 0.45-1.12, Fig. S3, Altunkaynak et al, 2012;Çelebi and Köprübaşı, 2014;Özyurt and Altunkaynak, 2020). On the multi-element variation diagrams normalized to primitive mantle, the rocks from the Western Tavşanlı Zone plutons are enriched in large ion lithophile elements and show negative anomalies of Nb-Ta, Sr and Ti, similar to the rocks formed in subduction-related environments.…”

Section: The Western Tavşanlı Zone Plutonsmentioning

confidence: 99%

“…Despite highly variable rock types, the rocks of the Western Tavşanlı Zone are characterized by narrow initial 87 Sr/ 86 Sr and ɛNd values of 0.70524-0.70676 and 0.55-3.89, respectively (Fig. 7b; Table S4, Altunkaynak et al, 2012;Çelebi and Köprübaşı, 2014;Gürarslan and Altunkaynak, 2019;Özyurt and Altunkaynak, 2020).…”

Section: The Western Tavşanlı Zone Plutonsmentioning

confidence: 99%

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Late Paleocene – Middle Eocene magmatic flare-up in western Anatolia

Okay

Topuz

Kylander-Clark

et al. 2022

Lithos

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“…They also stated that the northern belt granitoids have inherited zircons, indicating more continental crust involvement in magma generation. The rocks of the southern belt are calcalkaline to high-K calc-alkaline (Köprübaşı and Aldanmaz, 2004;Karacık et al, 2008;Çelebi and Köprübaşı, 2014), except some syenites from the Orhaneli Pluton, which are alkaline in nature (shoshonitic; Altunkaynak et al, 2012). Some of the high-K calcalkaline varieties in the Orhaneli Pluton reveal an adakitic nature (Altunkaynak et al, 2012) (Figure 10), whereas the northern belt generally represents calc-alkaline to high-K calc-alkaline rocks, except the Fıstıklı pluton, which shows tholeiitic affinity (Altunkaynak et al, 2012).…”

Section: Eocene Magmatism In the Sakarya Zonementioning

confidence: 99%

The Early Eocene Ekmekçi granodiorite porphyry in the Karacabey region(Sakarya Zone, NW Turkey)

Sunal¹,

Erturaç²,

Topuz³

et al. 2019

Turkish J Earth Sci

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The Ekmekçi granodiorite porphyry is a unit in the E-W trending, postcollisional Eocene magmatic rocks of northern Anatolia. It occurs as a relatively small stock, but represents a link between plutonic and volcanic rocks. This Early Eocene granodiorite porphyry intruded into the Upper Triassic rocks of the Karakaya complex in the Sakarya Zone. In this study we present geochemical and zircon U-Pb LA-ICP-MS age data to contribute to understanding the Early Tertiary postcollisional tectonic setting of NW Anatolia. The granodiorite porphyry includes plagioclase, quartz, hornblende, K-feldspar, biotite, and minor zircon, apatite, sphene, and opaque minerals. The stock displays medium-K calc-alkaline I-type and metaluminous affinity. Similar to other Eocene magmatic rocks, it displays characteristic features of subduction-related magmatism, such as enrichment in large-ion lithophile elements relative to highfield strength elements and enrichment of light rare earth elements relative to heavy rare earth elements with a lack of significant Eu anomalies. They are characterized by homogeneous initial Sr and Nd isotopic compositions of 0.7044-0.7049 and 0.51255-0.51260, respectively. Zircon U-Pb data indicate that the Ekmekçi granodiorite porphyry was emplaced at 5.1 ± 1 Ma (2s Ypresian). Geochemically, the Ekmekçi granodiorite porphyry is similar to mafic volcanic rocks rather than the plutonic rocks of the same age. It was emplaced to the north of the İzmir-Ankara-Erzincan Suture (northern plutonic belt of NW Anatolia) and can be correlated with southern plutons such as Orhaneli, Topuk, Tepeldağ, Gürgenyayla, and Sivrihisar in the Anatolide-Tauride block in terms of age.

show abstract

The geochemical and Sr–Nd isotopic characteristics of Eocene to Miocene NW Anatolian granitoids: Implications for magma evolution in a post-collisional setting

Cited by 10 publications

References 28 publications

Role of magma mixing in generating of the Gheshlagh–Aftabrow intrusions, SW Buin Zahra, Iran: Evidence for a juvenile origin from geochemical and Sr–Nd isotopic data

Role of magma mixing in generating of the Gheshlagh–Aftabrow intrusions, SW Buin Zahra, Iran: Evidence for a juvenile origin from geochemical and Sr–Nd isotopic data

Late Paleocene – Middle Eocene magmatic flare-up in western Anatolia

The Early Eocene Ekmekçi granodiorite porphyry in the Karacabey region(Sakarya Zone, NW Turkey)

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