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Occurrence and Mineralogy of Serpentine Minerals in the Calc-silicate Rock Sheets from the Bonghwa Area, Kyungsangbuk-do  

Bae, Sung-Woo (Division of Earth Environmental Science System, Pusan National University)
Hwang, Jin-Yeon (Division of Earth Environmental Science System, Pusan National University)
Lee, Son-Kap (Division of Earth Environmental Science System, Pusan National University)
Kwack, Kyu-Won (Division of Earth Environmental Science System, Pusan National University)
Yoon, Ji-Hae (Division of Earth Environmental Science System, Pusan National University)
Cho, Sung-Hwi (Industry & Academia Cooperation Foundation, Kyonggi University)
Publication Information
Journal of the Mineralogical Society of Korea / v.21, no.1, 2008 , pp. 85-98 More about this Journal
Abstract
Calc-silicate rock sheet occurs within the Precambrian metasedimentary rocks in Bonghwa area, Kyungsangbuk-do, Korea. The calc-silicate rock runs parallel to bedding plane with $14{\sim}18$ meters in width. Calcite, dolomite, serpentine and tremolite are occurred as major minerals and talc is occurred as a miner mineral. Serpentine mainly occurs in the upper part and tremolite occurs in lower part of calc-silicate rock sheet. Colors of calc-silicate rock change to deeper green with increasing amounts of serpentine mineral. XRD, FT-IR analyses indicates that serpentine mineral is antigorite. Platy structure of antigorite is well observed by SEM analysis. EPMA data indicates that chemical composition of antigorite is very close to ideal ($SiO_2$: 44.3 wt% and MgO: 40.8 wt%). The chemical formula of antigorite is calculated as $Mg_{2.82}Al_{0.04}Fe^{3+}_{0.04}Si_{2.05}O_5(OH)_4$. From careful study by comparing mineralogical analysis data and occurrence, calc-silicate rock sheet was formed by metamorphism of calcareous sedimentary rocks having different mineralogical and chemical compositions. It is considered that the host rock of serpentine enriched upper part was more Mg-rich rocks than the host rocks of tremolite enriched lower part.
Keywords
calc-silicate rock; serpentine; antigorite; tremolite; metamorphism;
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