High-K, calc-alkaline I-type granitoids from the composite Yozgat batholith generated in a post-collisional setting following continent-oceanic island arc collision in central Anatolia, Turkey |
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| Authors: | D Boztu? G B Arehart B Platevoet Y Harlavan B Bonin |
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| Institution: | (1) Department of Geological Engineering, Cumhuriyet University, Sivas, Turkey;(2) Department of Geological Sciences, University of Nevada, Reno, USA;(3) Laboratoire de Petrologie, Université de Paris-Sud, Orsay Cedex, France;(4) Geological Survey of Israel, Jerusalem, Israel |
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| Abstract: | Summary The composite Yozgat batholith consists of a S-I-A-type granitoid association intruding the supra-subduction zone-type (SSZ-type)
central Anatolian ophiolite and medium- to high-grade metasedimentary rocks of the central Anatolian crystalline complex.
These rocks are unconformably covered by Palaeocene to Early Eocene sedimentary rocks. The I-type granitoids are the most
common rock association of this huge batholith. In an area between the towns of Şefaatli and Yerk?y, the southwestern part
of the batholith can be subdivided into five mappable units: the Ak?akoyunlu quartz monzodiorite (mafic; hornblende K-Ar cooling
ages of 77.6–79.3 Ma); the Cankılı monzodiorite (mafic; hornblende K-Ar cooling age of 71.1 Ma); the Adatepe quartz monzonite
(mafic; hornblende K-Ar cooling age of 68.0 Ma); the Yassıağıl monzogranite (felsic; hornblende + biotite K-Ar cooling ages
of 69.9–79.8 Ma) and the Karakaya monzogranite (felsic; hornblende + biotite K-Ar cooling ages of 71.3–77.0 Ma). All the lithological
units, except the Karakaya monzogranite, include large K-feldspar megacrysts and various types of mafic microgranular enclaves
in field outcrops, indicating mingling and mixing. In addition, microscopic textures showing the hybridization between the
coeval mafic and felsic magma sources are present. Whole-rock major element geochemistry shows a high-K calc-alkaline, metaluminous,
I-type composition with an aluminium saturation index (ASI) less than 1.10 and with CIPW diopside content in all the lithological
units. Large ion lithophile elements (LILE), light rare earth elements (LREE), some high field strength elements (HFSE) (except
Nb) enrichments and significant crustal contribution revealed by the oxygen and sulphur stable isotope compositions in the
mafic and felsic I-type granitoid units are consistent with mafic lower crustal and metasomatized mantle sources the latter
of which were metasomatized by earlier supra subduction zone (SSZ)-derived fluids during the development of the SSZ-type central
Anatolian ophiolite.
Supplementary material to this paper is available in electronic form at |
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