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Petrogenesis of the Üçkapılı Granitoid and its Mafic Enclaves in Elmalı Area (Niğde, Central Anatolia, Turkey)
Author(s) -
KURT Hüseyin,
KOÇAK Kerim,
ASAN Kürşad,
KARAKAŞ Mustafa
Publication year - 2013
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12085
Subject(s) - mafic , geochemistry , geology , lile , biotite , amphibole , plagioclase , petrogenesis , mantle (geology) , petrology , partial melting , quartz , paleontology
The Late Cretaceous Üçkapılı Granitoid including mafic microgranular enclaves intruded into metapelitic and metabasic rocks, and overlain unconformably by Neogene ignimbrites in the Niǧde area of Turkey. It is mostly granite and minor granodiorite in composition, whereas its enclaves are dominantly gabbro with a few diorites in composition. The Üçkapılı Granitoid is composed mainly of quartz, K‐feldspar, plagioclase, biotite, muscovite and minor amphibole while its enclaves contain mostly plagioclase, amphibole, minor pyroxene and biotite. The Üçkapılı Granitoid has calcalkaline and peraluminous (A/CNK= 1.0–1.3) geochemical characteristics. It is characterized by high LILE/HFSE and LREE/HREE ratios ((La/Lu) N = 3–33), and has negative Ba, Ta, Nb and Eu anomalies, resembling those of collision granitoids. The Üçkapılı Granitoid has relatively high 87 Sr 86 Sr (i) ratios (0.711189–0.716061) and low εNd (t) values (−5.13 to −7.13), confirming crustal melting. In contrast, the enclaves are tholeiitic and metaluminous, and slightly enriched in LILEs (K, Rb) and Th, and have negative Ta, Nb and Ti anomalies; propose that they were derived from a subduction‐modified mantle source. Based on mineral and whole rock chemistry data, the Üçkapılı granitoid is H‐(hybrid) type, post‐collision granitoid developed by mixing/mingling processes between crustal melts and mantle‐derived mafic magmas.