GEOCHEMICAL CHARACTERISTICS AND RARE-EARTH ELEMENT DISTRIBUTIONS OF KOZBUDAKLAR W-SKARN DEPOSIT (BURSA, WESTERN ANATOLIA)

Yıl 2017, Cilt: 155 Sayı: 155, 115 - 130, 03.12.2017

Ayşe Orhan Halim Mutlu

https://doi.org/10.19111/bulletinofmre.305992

Öz

The Kozbudaklar W-skarn
deposit occurs along the contact between Eocene Topuk granitoid and Triassic
İnönü marble in Tavşanlı Zone. In the study area, the endoskarn is represented
by plagioclase-pyroxene and exoskarn zone which is characterized by pyroxene,
pyroxene-garnet, garnet and garnet-pyroxene skarn facies. According to major
oxide element contents, exoskarn is of calcic character. In pyroxene and
pyroxene-garnet skarn facies, tungsten and molybdenum abundances vary between
434-5507 ppm (mean 2330 ppm) and 8 - 90 ppm (mean 40 ppm). In the garnet and
garnet-pyroxene skarns, concentrations of these elements are 271 - 7616 ppm
(mean 2486 ppm) and 7 - 493 ppm (mean 107 ppm), respectively, and molybdenum
concentration is increased. ƩREE contents of the Topuk granitoid, endoskarn,
exoskarn and İnönü marble are in the range of 75.8 to 158.9 ppm (mean 106.2
ppm), 75.8 to 171.5 ppm (mean 114.6 ppm), 3.5 to 290.8 ppm (mean 48.7 ppm) and
2.3 to 15.3 ppm (mean 6.1 ppm), respectively. Although ƩREE concentrations of
skarn zones are higher than those of Topuk granitoid and İnönü marble, ƩREE
concentrations of tungsten-rich samples are signifi cantly depleted. In areas
of scheelite mineralization, REE trends and Eu anomalies display two different
patterns. REE trends, HREE enrichments and negative Eu anomalies of pyroxene
and pyroxene-garnet skarn facies exhibit similarities with Topuk granitoid. In
these skarn facies, tungsten-rich samples are represented by a Ce depletion and
low Eu/Eu* (Eu/Eu* = 0.56-0.88). Garnet and garnet-pyroxene skarn facies are
characteristic with a convex LRRE pattern, maximum Pr and Nd concentrations and
positive Eu anomalies. Ce-enrichment and high Eu/Eu* ratios (Eu/Eu* = 1.45 -
4.18) are observed in tungsten-rich samples. Considering the molybdenum
enrichments and REE pattern, scheelite mineralization in the Kozbudaklar
W-skarn deposit can be said to have developed at two different high temperature
phases. In the fi rst-phase mineralization was formed by early magmatic fl uids
under moderate oxidant conditions whilst the second-phase scheelite
mineralization was formed under increasing oxidant conditions.

Anahtar Kelimeler

Scheelite Mineralization, Rare-Earth Elements, Kozbudaklar, Bursa, Western Anatolia

Kaynakça

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