GEOCHEMICAL CHARACTERISTICS OF THE MAFIC ENCLAVES AND THEIR HOSTS FROM NEOGENE ERENLERDAGI VOLCANITES, AROUND YATAGAN VILLAGE AND SAĞLIK TOWN (KONYA), CENTRAL TURKEY

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Δημοσιευμένα: Ιουλ 28, 2016
DOI: https://doi.org/10.12681/bgsg.11928
K. Koçak
Περίληψη

Late Miocene to Pliocene volcanism is represented by development of lava domes, nuée ardentes and pyroclastic fall and flow (ignimbrites) deposits in the WSW and NW of Konya city. The lava dome contains various mafic microgranular enclaves (MMEs), which have various size (a few cm to a few meters), shape (ellipse/sphere to rounded), with a well-developed chilly zone. The MMEs samples are situated on mostly basaltic andesite and andesite, and a few MME samples on basaltic trachyandesite area while the host rocks are concentrated on dacite and andesite areas. The felsic samples have more fractionated chondrite-normalised REE pattern (La/YbN: 9.5-18.1) than MMEs (6.7-16.0) ones, but both have slightly developed negative Eu anomaly (Eu/Eu*: 0.67-0.89 in felsic rocks, 0.68-0.87 in MMEs). In primitive mantlenormalized spider diagram, the MMEs and felsic rocks have negative Nb, Ta, P and Ti anomalies, indicating some subduction component in their genesis. Based on geochemical data, the MMEs are suggested to have been formed by hybridization of basic magma mingled with partially crystallized felsic magma.

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65
SiO2
55 60 65
18 20 22 24 SiO2
Y
55 60 65
25 30 35 40 SiO2
La
40 50 60 70 Ce
65
SiO2
55 60 65
5 0.6 0.7 0.8 0.9 1.0 1.1
SiO2
A CNK
55 60 65
6 0.7 0.8 0.9 1.0 1.1 1.2
SiO2
K2O Na2O
65
0 1.5 2.0 2.5 SiO2
Ni
55 60 65
600 800 SiO2
Ba
55 40 60 80 100 Rb
55 60 65
120 130 140 150 160 170 180
SiO2
Zr
55 60 65
18 20 22 24 26 28 30
SiO2
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La
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SiO2
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