DOI QR코드

DOI QR Code

Petrological characteristics of the Yeongdeok granite

영덕화강암의 암석학적 특징

  • Woo, Hyeon-Dong (Department of Structural Systems and Site Evaluation, Korea Institute of Nuclear Safety) ;
  • Jang, Yun-Deuk (Department of Geology, Kyungpook National University)
  • 우현동 (한국원자력안전기술원 구조부지평가실) ;
  • 장윤득 (경북대학교 자연과학대학 지질학과)
  • Received : 2014.01.15
  • Accepted : 2014.04.07
  • Published : 2014.06.30

Abstract

The Yeongdeok granite emplaced in the eastern Yeongyang subbasin is typically a medium- to coarse-grained massive biotite granite. It intruded into Precambrian schist & gneiss complex and is unconformably overlain by Cretaceous sedimentary rocks. In this study, we attempt to investigate the magma type which formed Yeongdeok granite and estimate the emplacement depth using Al-in-hornblende geobarometer to mineral composition. According to the magma fractionation, $TiO_2$, $Al_2O_3$, $Fe_2O_3{^*}$, FeO, $Fe_2O_3$, MnO, MgO, CaO, $Na_2O$ and $P_2O_5$ show positive trend but $K_2O$ indicate negative trend with $SiO_2$ contents. Those are identified as calc-alkaline series in AFM diagram and show the chemical characteristics of the I-type magma through the oxidation tendency of the iron ion and the portion of the alkaline composition. When calculated using the equation of Hollister et al. (1987), the emplacement depths of the Yeongdeok granite range from 8.98 to 17.19 km and average depth was estimated 13.03 km approximately.

영덕 화강암은 경상분지에 속해있는 영양 소분지의 동부에 분포하고 있으며 균질한 중립질 내지 조립질의 괴상으로 산출된다. 하부에서는 편암 및 편마암 복합체를 관입하고 있으며 상부는 백악기 퇴적암에 의해 부정합적으로 피복되어있다. 암석화학분석을 통하여 영덕 화강암의 마그마형을 밝히고 광물화학분석에 각섬석 지압계를 적용하여 정치깊이를 추정하고자 하였다. 암석화학 분석결과 마그마의 분화가 진행됨에 따라 $TiO_2$, $Al_2O_3$, $Fe_2O_3{^*}$, FeO, $Fe_2O_3$, MnO, MgO, CaO, $Na_2O$$P_2O_5$의 함량은 감소하고 $K_2O$의 함량은 증가하는 경향을 보여주며, 마그마 분화양상의 도식에서는 칼크알칼리계열에 해당하였고 철이온의 산화경향 및 알칼리성분의 함량비는 I-타입의 마그마임을 지시한다. 또한 각섬석의 $Al^T$성분을 Hollister et al. (1987)의 식에 적용한 결과 화강암의 정치압력은 지하 약 8.98 내지 17.19 km, 평균깊이는 13.03 km인 것으로 계산되었다.

Keywords

References

  1. Aum, H.W., Kim, Y. and Cheong, W., 2013, Lithology and Geology of Deokjeok Island, Western Gyeonggi Massif, Central Korea. Journal of Petrological Society of Korea, 22, 263-272. https://doi.org/10.7854/JPSK.2013.22.4.263
  2. Cheong, C.-S., Kwon, S.-T. and Sagong, H., 2002, Geochemical and Sr-Nd-Pb isotopic investigation of Triassic granitoids and basement rocks in the northern Gyeongsang Basin, Korea: Implications for the young basement in the East Asian continental margin, The Island Arc, 11, 25-44. https://doi.org/10.1046/j.1440-1738.2002.00356.x
  3. Cho, D.L. and Kwon, S.T., 1994, Hornblende Geobarometry of the Mesozoic Granitoids in South Korea and the Evolution of Crustal Thickness. Journal of the Geological Society of Korea, 30, 41-61.
  4. Hammarstrom, J.M. and Zen, E-an, 1986, Aluminum in hornblende: An empirical igneous geobarometer, Am. Min., 71, 1297-1313.
  5. Han, M., Kim, S.-W., Yang, K.-H. and Kim, J.-S., 2010, Petrological Study of the Dioritic and Granitic Rocks from Geochang Area. Journal of Petrological Society of Korea, 19, 167-180.
  6. Hine, R., I.S. Williams, B.W. Chapple and A.J.R. White, 1978, Contrasts between I- and S-type granitoids of the Kosciusko batholith, J. Geo. Soc. Australia, 25, 129-234.
  7. Hollister, L.S., Grissom, G.C., Peters, E.K., Stowell, H.H. and Sisson, V.B., 1987, Confirmation of the empirical correlation of Al in hornblende with pressure of solidification of calc-alkaline plutons, Am. Min., 72, 231-239.
  8. Hong, S.S., 2001, Implication for the emplacement depth of the granites in the Yeongnam Massif, using the aluminum-in-hornblende batometry. Journal of the Petrological Society of Korea, 10, 36-55.
  9. Hwang, J., 2013, Occurrence of U-minerals and Source of U in Groundwater in Daebo Granite, Daejeon Area. The Journal of Engineering Geology, 23, 399-407. https://doi.org/10.9720/kseg.2013.4.399
  10. Irvine, T.N. and Baragar, W.R.A., 1971, A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences, 8, 523-548. https://doi.org/10.1139/e71-055
  11. Jeong, C.H., Ryu, K.S., Kim, M.S., Kim, S.K., Han, J.S. and Jo, B.U., 2013, Geochemical Occurrence of Uranium and Radon-222 in Groundwater at Test Borehole Site in the Daejeon area. The Journal of Engineering Geology, 23, 171-186. https://doi.org/10.9720/kseg.2013.2.171
  12. Johnson, M.C. and Rutherford, M.J., 1989, Experimental calibration of the aluminum-in-hornblende geobarometer with application at Long Valley caldera (California) volcanic rocks, Geology, 17, 837-841. https://doi.org/10.1130/0091-7613(1989)017<0837:ECOTAI>2.3.CO;2
  13. Jwa, Y.J., Kim, J.S. and Kim, K.K, 2005, Granite Suite and Supersuite for the Triassic Granites in South Korea. Journal of the Petrological Society of Korea, 14, 226-236.
  14. Kim, J.-S., Kim, K.-K., Jwa, Y.-J. and Son, M., 2012, Cretaceous to Early Tertiary Granites and Magma Mixing in South Korea: Their Spatio-temporal Variations and Tectonic Implications (Multiple Slab Window Model), Journal of Petrological Society of Korea, 21, 203-216. https://doi.org/10.7854/JPSK.2012.21.2.203
  15. Kim, J.W. and Lee, Y.J., 1993, Phase Transition of K-feldspar in the Plutonic Rocks from the Vicinity of Yongdok-Uljin Area, Northeastern Gyeongsang Basin, Korea. Journal of the Korean Earth Science Society, 14, 316-325.
  16. Kim, O.J., 1971, Study on the Intrusion Epochs of Younger Granites and their Bearing to Orogenies in South Korea. Journal of the Korean Institute of Mining Geology, 4, 1-9.
  17. Kim, S.J., Lee, H.K., Lee, C.H. and Itaya, T., 1999, K-Ar Ages and Geochemistry of Granitic Rocks in the Northeastern Gyeongsang Basin. Economic and Environmental Geology, 32, 141-150.
  18. Koh, J.S., Yun, S.H., Ahn, J.Y., Kim, H.S. and Choi, Y.J., 2000, Emplacement Depth of Cretaceous Granites in Kyeongsang Basin, E Korea. Journal of the Korean Earth Science Society, 21.
  19. Leake, B.E., Woolley, A.R., Arps, C.E.S., Birch, W.D, Guilbert, W.C., Grice, J.D., Hawthorne, F.C., Kato, A., Kisch, H.J., Krivovichev, V.G., Linthout, K., Laird, J., Mandarino, J.A., Maresch, W.V., Nickel, E.H., Rock, N.M.S., Schumacher, J.C., Smith, D.C., Stephenson, N.C.N., Ungaretti, L., Whittaker, E.J.W. and Youzhi, G., 1997, Nomenclature of amphiboles: Report of the Subcommittee on amphiboles of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35, 219-246.
  20. Lee, Y.J. and Kim, J.W., 1990, Characrteristics of Evolution Trends of Biotites in the Cretaceous to Tertiary Granitic Rocks of the Southern Gyeongsang Basin, Korea. Journal of the Geological Society of Korea, 26, 133-142.
  21. Lee, Y.J., Kim, J.W. and Chung, W.O., 1993, Evolution Trends of Biotite and Hornblend in Granitic Rocks from Yonghae-Yongdok Area, Northeastern Gyeongsang Basin, Korea. Journal of the Korean Institute of Mining Geology, 26, 349-361.
  22. Park, J.-B., Kim, Y.-J., 2012, Mineral Compositions of Granitic Rocks in the Yeongkwang-Naju Area. Econ. Environ. Geol., 45, 535-549. https://doi.org/10.9719/EEG.2012.45.5.535
  23. Sagong, H., Kwon, S.-T. and Ree, J.-H., 2005, Mesozoic episodic magmatism in South Korea and its tectonic implication, Tectonics, 24, TC5002, doi:10.1029/2004TC001720.
  24. Schmidt, M.W., 1992, Amphibole composition in tonalites as a function of pressure: an experimental calibration of the Al-in-hornblende geobarometer, Contrib. Mineral Petrol., 110, 304-310. https://doi.org/10.1007/BF00310745
  25. Shin, S.-C., 2012, Cooling and Thermal Histories of Cretaceous-Paleogene Granites from Different Fault-bounded Blocks, SE Korean Peninsula: Fission-track Thermochronological Evidences. Journal of Petrological Society of Korea, 21, 335-365. https://doi.org/10.7854/JPSK.2012.21.3.335
  26. Simakin, A., Zakrevskaya, O. and Salova, T., 2012, Novel amphibole geo-barometer with application to mafic zenoliths. Earth Science Research, doi:10.5539/esr.v1n2p82.
  27. Spear, F.S., 1981, An experimental study of hornblende stability and compositional variability in amphibolite, Am. Jour. Sci., 281, 697-734. https://doi.org/10.2475/ajs.281.6.697
  28. Wee, S.M., Kim, J.-Y and Lim, S.-M, 2013, Geochemical Characteristics of the Uljin Granitoids in Northeastern Part of the Yeongnam Massif, Korea. Journal of Korean Earth Science Society, 34, 313-328. https://doi.org/10.5467/JKESS.2013.34.4.313
  29. White, A.J.R. and B.W. Chappell, 1977, Ultrametamorphism and granitoids gneiss, Tectonophysics, 43, 7-22. https://doi.org/10.1016/0040-1951(77)90003-8
  30. Won, C.K., Kang, P.C. and Lee, S.H., 1978, Study on the Tectonic Interpretation and Igneous Pluton in the Gyeongsang Basin. Journal of the Geological Society of Korea, 14, 79-92.
  31. Yi, K., Cheong, C.-S., Kim, N., Lee, S. and Choi, M.-S., 2012a, Mixing effects in zircon U-Pb ion microprobe dating: An example from a quartzofeldsparthic dyke in the Yeongdeok pluton, southeastern Korea. Geochemical Journal, 46, 261-266. https://doi.org/10.2343/geochemj.2.0202
  32. Yi, K., Cheong, C.-S., Kim, J., Kim, N., Jeong, Y.-J. and Cho, M., 2012b, Late Paleozoic to Early Mesozoic arcrelated magmatism in southeastern Korea: SHRIMP zircon geochronology and geochemistry. Lithos, 153, 129-141. https://doi.org/10.1016/j.lithos.2012.02.007
  33. Yoo, J.H., Koh, S.M. and Moon, D.H., 2012, Introduction of Several Albitite-greisen Type Deposits of Korea. Journal of Mineralogical Society of Korea, 25, 221-231. https://doi.org/10.9727/jmsk.2012.25.4.221
  34. Yoo, J.H., Koh, S.M. and Moon, D.H., 2013, Presence of Leucocratic Granites of the Taebaegsan Region and Its Vicinities. Journal of Mineralogical Society of Korea, 26, 263-272. https://doi.org/10.9727/jmsk.2013.26.4.263
  35. Yun, H.-S., Hong, S.-S., Park, D.-W. and Lee, J.-Y., 2012, Applied Petrologic Study of the Daebo Biotite Granites in the mid Gyeonggi Massif. Journal of Petrological Society of Korea, 21, 263-275. https://doi.org/10.7854/JPSK.2012.21.2.263

Cited by

  1. Petrological Characteristics of the Satkatbong Pluton, Yeongdeok, Korea vol.25, pp.2, 2016, https://doi.org/10.7854/JPSK.2016.25.2.121
  2. Distribution Characteristics of Geologic Age and Rock Type of Bedrocks at the National Wood Culture Heritage Site by GIS vol.24, pp.4, 2015, https://doi.org/10.7854/JPSK.2015.24.4.347