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http://dx.doi.org/10.9727/jmsk.2014.27.2.85

Mineralogical and Geochemical Studies on Tourmaline in Felsite from the Daeduk Mountain, Daegu, South Korea  

Woo, Hyeon Dong (Korea Institute of Nuclear Safety)
Park, Seong Eun (Department of Geology, Kyungpook National University)
Jang, Yun Deuk (Department of Geology, Kyungpook National University)
Kim, Jung Jin (Department of Earth and Environmental Sciences, Andong National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.27, no.2, 2014 , pp. 85-95 More about this Journal
Abstract
The felsitic intrusives of Bulguksa granitic rocks of late Cretaceous in age are located at Mt. Daeduk, Daegu, where two different types of tourmalines are found. Two tourmalines show rounded and radiating in morphology and are found in separated region, but in same felsitic rocks. In this study, we investigate the chemical differences between two types of tourmaline and the effect of growing condition of the crystal on the its morphology. The rounded tourmaline has more amounts of Al and vacancy and less amounts of Ca, Na, K, Fe, Mn, Mg, which commonly occupy X and Y-site of the tourmaline. On the basis of the Diffusion-limited aggregation model, morphological irregularity indicates the active mobility of the magma. The radiating tourmaline, therefore, crystallized with active magma condition relatively, and the rounded tourmaline crystallized with stable magma condition created by decreasing temperature and the concentration of felsic components as the magma differentiate continually.
Keywords
Borosilicate; Bulguksa intrusive rocks; Diffusion-limited aggregation; Felsite; Tourmaline;
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