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http://dx.doi.org/10.5467/JKESS.2011.32.7.860

A Perception of Beginning Earth Science Teachers on Porphyritic Texture  

Kim, Yong-Hwan (Division of Science Education/Institute of Fusion Science, Chonbuk National University)
Chung, Duk-Ho (Science Education Institute for the Gifted, Chonbuk National University)
Cho, Kyu-Seong (Division of Science Education/Institute of Fusion Science, Chonbuk National University)
Choi, Jin-A (Division of Science Education/Institute of Fusion Science, Chonbuk National University)
Park, Kyeong-Jin (Division of Science Education/Institute of Fusion Science, Chonbuk National University)
Publication Information
Journal of the Korean earth science society / v.32, no.7, 2011 , pp. 860-870 More about this Journal
Abstract
This study is to explore the Pedagogical Content Knowledge of beginning earth science teachers about the porphyritic texture of igneous rocks, and to suggest the teaching device that can prevent a trial and error of students in earth science instruction. We developed an interview guideline concerned with basic perception on the porphyritic texture, formation condition and formation process of porphyritic rocks, teaching and learning on porphyritic rocks for it. And data was collected from 5 beginning earth science teachers (3 high schools, 2 middle schools) through a group discussion method. In result, despite the porphyritic texture can be found at hypabyssal rocks as well as volcano rocks and plutonic rocks, most beginning earth science teachers cognized that it could be found at hypabyssal rocks only by focusing the formation depth of hypabyssal rocks. Also, the formation of porphyritic texture should be considered the factors such as cooling rate, nucleation density, growth rate, growth time, etc. However they mainly reflected the formation temperature and growth rate as it's parameter. Participants have wrongly perceived that a phenocryst necessarily differs from a groundmass on chemical composition. And they are inclined to discriminate phenocryst from groundmass through their chemical differences, instead of grain size.
Keywords
porphyritic texture; pedagogical content knowledge; perception of beginning science teacher;
Citations & Related Records
Times Cited By KSCI : 11  (Citation Analysis)
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