Oxygen and sulfur isotope geochemistry revealing a significant crustal signature in the genesis of the post-collisional granitoids in central Anatolia, Turkey

Boztuğ, Durmuş; Arehart, Greg B.

doi:10.1016/j.jseaes.2006.11.006

Cited by 28 publications

(14 citation statements)

References 55 publications

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“…Accordingly, these monzonitic I-type CAG of ca. 74 Ma age, together with some A-type granitoids, are interpreted to be related to melting of lower crustal granitic and granulitic rocks, residual material from the older metamorphic and magmatic events, and probably the subcontinental lithospheric mantle rocks with heat supplied by mantle-derived mafic magma underplating of the lower crust as a result of lithospheric delamination and thinning (e.g., Göncüoglu and Türeli 1994;Aydin et al 1998;Boztug 1998Boztug , 2000Düzgören-Aydin et al 2001;Köksal et al 2004;Ilbeyli et al 2004;Boztug et al 2007a, b, c;Boztug and Arehart 2007;Boztug and Harlavan 2008;Boztug et al 2009) in this post-collisional period (Fig. 9d).…”

Section: Discussionmentioning

confidence: 99%

“…Extension continued in the late Campanian-early Maastrichtian and was characterized by the formation of the silica-saturated to undersaturated A-type granitoids and associated volcanic rocks (e.g., Boztug 2000;Köksal et al 2001;Boztug and Arehart 2007). The post-collisional thickening period in central Anatolia ended with formation of A-type granitoids (e.g., Köksal et al 2004) and changed into an extensional regime, characterized by alkaline volcanic rocks Alpaslan et al 2004Alpaslan et al , 2006Kurt et al 2008), while the Sakarya Continent was juxtaposed to the CACC with the Ankara mélange in between those units (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)

Köksal

Möller

Göncüoğlu

et al. 2011

Contrib Mineral Petrol

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Geochemical and isotopic evidence from the Agaçören Igneous Association in central Anatolia-Turkey indicates that this suite of calc-alkaline granitic rocks have undergone crustal homogenization during regional metamorphic and related magmatic events. Whole-rock chemical and Sr-Nd isotopic data of the granitoids reveal crustal affinity with an earlier subduction component. Zircons show inherited cores and subsequent magmatic overgrowths. The laser ablation ICP-MS 206 Pb/ 238 U zircon ages are determined as 84.1 ± 1.0 Ma for the biotite-muscovite granite, 82.3 ? 0.8/-1.1 Ma for the hornblende-biotite granite, 79.1 ? 2.1/-1.5 Ma for the granite porphyry dyke, 75.0 ? 1.0/-1.0 Ma for the alkali feldspar dyke, and 73.6 ± 0.4 Ma for the monzonite. This is interpreted as continuous magma generation, possibly from heterogeneous sources, from ca. 84 to 74 Ma during the closure of the northern branch of the Neotethyan Ocean. The oldest granitoids (84-82 Ma) were probably formed due to crustal thickening after obduction of the MORB-type oceanic crust onto the Tauride-Anatolide microplate. The younger granitoids are interpreted to be related to the subsequent post-collisional extension after lithospheric delamination. Combination of the laser ablation ICP-MS zircon Lu-Hf isotope data with the U-Pb ages of inherited cores suggests that Cretaceous granitoids formed by melting of heterogeneous crustal protoliths, which results in significant variation in eHf (t) data (from -12.9 to ?2.2). These protoliths were probably composed of reworked Early Proterozoic crust, minor juvenile Late Proterozoic magmatic components, and Paleozoic to pre-Late Cretaceous recycled crustal material. Moreover, the Late Cretaceous zircon domains of the different granitoids are characterized by a crustal signature, with a relatively restricted zircon eHf (t) data ranging from -4.1 to -8.8. This variation is only about twice the reproducibility (ca. ±1 eHf) of the data, but Communicated by J. Hoefs. Electronic supplementary materialThe online version of this article (much smaller than the isotope variability of inherited zircons. Our preferred interpretation is effective isotopic homogenization of the heterogeneous central Anatolian crust during the Late Cretaceous high-grade metamorphic and magmatic events, a process that we propose to be relevant for other active continental margins.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)

Köksal

Möller

Göncüoğlu

et al. 2011

Contrib Mineral Petrol

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“…Boztuğ (2000) identified separate magmatic episodes along the passive margin of the Anatolides such as a syncollisional peraluminous episode, a postcollisional calc-alkaline hybrid, and a postcollisional within-plate alkaline episode. The I-type intrusions in central Anatolia are considered to be postcollisional (Önal et al, 2005;Boztuğ and Arehart, 2007;Delibaş et al, 2011). Boztuğ (1998) considered that at the end stages of crustal thickening, lithospheric delamination could generate underplating of mafic magma, which also melts the lowermost part of crust that yields the voluminous postcollisional, calc-alkaline, I-type monzonitic-granodioritic hybrid association in central Anatolia.…”

Section: Discussionmentioning

confidence: 99%

Geological, petrological, and geodynamical characteristics of the Karacaali Magmatic Complex (Kırıkkale) in the Central Anatolian Crystalline Complex, Turkey

Elitok¹,

Özdamar²,

Bacak³

et al. 2014

Turkish J Earth Sci

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“…The lithospheric delamination would invoke upwelling of mantle asthenosphere and heat undelaminated lithosphere. This results in subsequent partial melting of not only middle and lower crust [21,22,[61][62][63] but also remnants of lithospheric mantle that escaped delamination [25,64]. Whether the lithospheric mantle underwent partial melting during the late Indosinian is critical to support the lithospheric delamination model.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Petrogenesis of Indosinian volcanic rocks in Songpan-Garze fold belt of the northeastern Tibetan Plateau: New evidence for lithospheric delamination

Cai

Zhang

et al. 2010

Sci. China Earth Sci.

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In the Songpan-Garze fold belt of the northeastern Tibetan Plateau, an Indosinian lithospheric delamination model has been proposed, based on previous investigation of widespread granitoids. However, this model lacks comparable information from volcanism in the area. During the Indosinian delamination in the Songpan-Garze fold belt, whether partial melting of lithospheric mantle taken place is debated. This paper reports U-Pb zircon LA-ICP-MS ages, geochemical and Sr-Nd-Hf isotopic compositions from the Aba and Wasai calc-alkaline volcanic rocks in the central Songpan-Garze fold belt. Obtained magma crystallization ages are 210±3 Ma for the Aba andesite and 205±1 Ma for the Wasai andesite. These are consistent with magma crystallization ages of the late Indosinian granitoids in the Songpan-Garze fold belt that formed in a post-collisional tectonic setting. The Aba and Wasai andesites have distinct geochemical singnatures. The former has higher Al 2 O 3 , K 2 O, Rb but lower Na 2 O, Ba and Sr contents, suggesting differences in their magmatic evolution. The Aba andesites have I Sr values of 0.7070-0.7076 and ε Nd (t) values of −3.9 to −5.3, and the Wasai andesites have I Sr values of 0.7075-0.7077 and ε Nd (t) values of −3.6 to −3.9. Zircons show ε Hf (t) values of −3.7 to 0.3 for the Aba andesites and −2.7 to 5.5 for the Wasai andesites. Geochemical and Sr-Nd-Hf isotopic compositions indicate that fractional crystallization and crustal assimilation processes are not key roles for their magma evolution, implying that their chemical compositions are those of primary melts. We suggest that the magma of the Aba andesites originated predominantly from a crustal source, with a minor mantle-derived component. The source region of the magma was likely at the crust-mantle boundary. The magma of the Wasai andesites resulted from partial melting of lithospheric mantle, which was probably metasomatized by fluids so that it was amphibole bearing. The petrogenesis of the Aba and Wasai andesites provides an additional evidence for the lithospheric delamination in the the Songpan-Garze fold belt, indicating that this process invoked mantle asthenosphere upwelling and caused the partial melting of remaining lithospheric mantle. volcanism, U-Pb dating, geochemistry, petrogenesis, lithospheric delamination, Songpan-Garze fold belt Citation: Cai H M, Zhang H F, Xu W C, et al. Petrogenesis of Indosinian volcanic rocks in Songpan-Garze fold belt of the northeastern Tibetan Plateau: New evidence for lithospheric delamination.

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Oxygen and sulfur isotope geochemistry revealing a significant crustal signature in the genesis of the post-collisional granitoids in central Anatolia, Turkey

Cited by 28 publications

References 55 publications

Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)

Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)

Geological, petrological, and geodynamical characteristics of the Karacaali Magmatic Complex (Kırıkkale) in the Central Anatolian Crystalline Complex, Turkey

Petrogenesis of Indosinian volcanic rocks in Songpan-Garze fold belt of the northeastern Tibetan Plateau: New evidence for lithospheric delamination

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