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Rb-Sr Whole-rock Isochron Age and Petrology of the Mt. Geumjeong Granite, Busan  

Yun Sung-Hyo (Department of Earth Science Education, Pusan Notional University)
Koh Jeong-Seon (Institute of Science Education, Pusan National University)
Park Kwang-Sun (Jang Young Sil Science High School)
Ahn Hyo-Chan (Jang Young Sil Science High School)
Kim Young-Il (Jang Young Sil Science High School)
Yoo Sung-Hyeon (Jang Young Sil Science High School)
Lee Dong-Han (Jang Young Sil Science High School)
Yun Gi-Young (Jang Young Sil Science High School)
Publication Information
The Journal of the Petrological Society of Korea / v.14, no.1, 2005 , pp. 61-72 More about this Journal
Abstract
The granitoids in the Mt. Geumjeong, Busan can be divided into granodiorite, hornblende granite, adamellite, tonalite, biotite granite and micrographic granite. The geochemical characteristics of the Mt. Geumjeong granites indicate that they were crystallized from a calc-alkaline series and that they belong to Ⅰ-type granitic rocks which evolved from granodioritic magma into hornblende granite, adamellite, biotitie granite, and finally micrographic granite through fractional crystallization of plagioclase. The crystallization pressures and temperatures of the minimum melt compositions of the granitic rocks were estimated to about 1∼5 kbar and 720∼700℃. The trace element composition and REE patterns, characterized by a high LILE/HFSE ratio and enrichments in LREE, indicate typical continental margin arc calc-alkaline rocks produced in the subduction environment. The Rb-Sr isotopic data for the Mt. Geumjeong granites define a well-defined isochron yielding as age of 69.6±1.9 Ma with an initial Sr isotopic ratio of 0.70503.
Keywords
Mt. Geumjeong granite; Plagioclase; Fractional crystallization; 69.6Ma;
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