Browse > Article

Geochemistry of Granites in the Southern Gimcheon Area of Korea  

윤현수 (한국지질자원연구원 지질기반정보연구부)
홍세선 (한국지질자원연구원 지질환경재해연구부)
Publication Information
The Journal of the Petrological Society of Korea / v.12, no.1, 2003 , pp. 16-31 More about this Journal
Abstract
The granites in the southern Gimcheon area can be divided into two parts, marginal hornblende biotite granodiorite (Mgd) and central biotite granodiorite to granite (Cgd). Mgd and Cgd are gray in color and display gradational contact relations and are mainly composed of coarse-grained and medium-grained rocks, respectively. Mgd has more frequent and larger mafic enclaves than Cgd, and the two granites partly show parallel foliation at thire contact with gneisses. From representative samples of the granites, K-Ar biotite ages of 197∼207 Ma were obtained. Considering the blocking temperature of biotite, it is suggested that the emplacement age of the granitic magma was probably late Triassic. The anorthite contents of plagioclases in Mgd display less variation than those of Cgd, indicating that Mgd crystallized within a narrow range of temperatures. In the Al$\_$total/-Mg diagram, the biotites from the granites plot within the subalkaline field, and the smooth slope indicates differentiation from a single magma. All amphiboles from the granites belong to magnesio-hornblende. The linear trends of major oxides, AFM and Ba-Sr-Rb indicate that Mgd and Cgd were fractionally differentiated from a single granitic magma body crystallizing from the margin inwards. The relations of modal (Qz+Af) vs. Op, K$_2$O vs. Na$_2$O, Fe$_2$ $O_3$ vs. FeO, Fe$\^$+3/(Fe$\^$+3/+Fe$\^$+2/) and K/Rb vs. Rb/Sr show that they belong to I-type and magnetite-series granitic rocks developed by the progressive melting products of fixed sources. REE data, normalized to chondrite value, have trends of enriched LREE and depleted HREE together with weakly negative Eu anomalies.
Keywords
Gimcheon Triassic granites; a granitic magma; I-type;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Pearce, J.A., Harris, N.B.W. and Tindle, A.G., 1984, Trace element discrimination diagrams for the tectonic interpretation of the granitic rocks. J. Petrol., 25, 956-983
2 Taylor, S.R., 1965, The application of trace element data to problems in petrology. Physics and chemistry of the earth, 6, 133-213
3 Taylor, S.R. and Mclennan, S.M., 1985, The continental crust: its composition and evolution. Blackwell, Oxford, 312 p.
4 White, A.J.R. and Chappell, B.W., 1983, Granitoid types and their distribution in the Lanchlan fold belt, southεastem Australia. Geol. Soc. Amer. Memoir 159, 21-34
5 Strong, D.F. and Hanmer, S.K., 1976, The leucogranites of Southern Brittany: Origin by faulting, frictional heating, fluid flux and fractional melting. Can. κ1in., 19, 163-176
6 The magnetite-series and ilmenite-series granitic rocks /
[ Ishihara,S. ] / Mining Geol.
7 Putman, G.W. and Burnham, C.W., 1963, Trace elements in igneous rocks, northeastern and central Arizona Geochim, Cosmochim. Acta, 27, 53-58Schmidt, M.W., 1992, Amphibole composition in tonalites as a function of pressure: an experimental calibration of the Al-in-hornblende barometer. Contrib. Mineral. Petrol., 110, 304-310
8 Chappell, B.W., and White, A.J.R., 1974, Two contrasting granite types. Pacific Geol. 8. 173-174
9 Investigations of an intrusive contact, northwest Nelso, New Zealand-I. Thermal, chronological and isotopic constraints /
[ Harrison,T.M.;McDougall,I. ] / Geochim. Cosmochim. Acta.
10 Contrasts between I-and S-type granitoids of the Kosciusko batholith /
[ Hine,I.S.;Williams,I.S.;Chappell,B.W.;White,A.J.R. ] / J. Geol. Soc. Aust.
11 The application of trace element data to problems in petrology /
[ Taylor,S.R. ] / Physics and chemistry of the earth
12 Granitoids and their magnetic susceptibility in South Korea /
[ Jin,M.S.;Lee,Y.S.;Ishihara,S. ] / Reource Geol.
13 The phanerozoic time scale in 1981 /
[ Odin,G.S.;D.Curry,N.H.;Gale,N.H.;Kennedy,W.J. ] / Numerical dating in stratigraphy
14 Geochemical characteristics of Precambrian, Jurassic and Cretaceous granites in Korea /
[ Hong,Y.K. ] / J. Korean Inst. Min. Geol.
15 Petrogenetic interpretation of granitoid rock series using multicationic parameters /
[ Batcherlor,R.A.;Bowden,P. ] / Chem. Geol.
16 General geochemical properties and abundances of the rare earth elemetns /
[ Henderson,P. ] / Rare earth element geochemistry
17 Petrology of granites in the vincity of Mt, Maegma-Unnam, southeast Kimchon, Korea. /
[ Lee,C.L;Lee,Y.J.;Hayashi,M. ] / J. Soc. Korea.   과학기술학회마을
18 The decade of North American geology. 1983 geological time scale /
[ Palmer,A.R. ] / Geol.
19 The leucogranites of Southern Brittany:Origin of faulting, frictional heating, fluid flux and fractional melting /
[ Strong,D.F.;Hanmer,S.K. ] / Can. Min.
20 Two contrasting granite types /
[ Chappell,B.W.;White,A.J.R. ] / Pacific Geol.
21 A guide to the chemical classification of the common volcanic rocks /
[ Irvine,T.N.;Baragar,W.R.A ] / Can.J. Earth Sci.
22 Trace element discrimination diagrams for the tectonic interpretation of the granitic rocks /
[ Pearce,J.A.;Harris,N.B.W.;Tindle,A.G. ] / J.Petrol.
23 New radiometric ages of the granitic rocks in the Yeongnam Massif(abstract) /
[ Lee,J.I.;Jwa,Y.J.;Kagami,H.;Uchiumi,S. ] / Econ. Environ. Geol. Abstract with programs
24 Trace elements in igneous rocks, northeastern and central Arizona /
[ Putman,G.W.;Burnham,C.W. ] / Geochim. Cosmochim. Acta.
25 Granitoid types and their distribution in the Lanchlan fold belt, southeastern Australia /
[ White,A.J.R.;Chappell,B.W. ] / Geol.Soc.Amer.Memoir
26 The relation between Rb, Ba and Sr in granitic rocks /
[ Bouseiley,A.M.;Sokkary,A.A. ] / Chem. Geol.
27 Composition chimique des biotites et typologie magnatique des granitoieds, /
[ Nachit,H.;Razafimalhefa,N.;Stussi,J.M.;Carron,J.P. ] / Acad. Sci.
28 /
[ Hyndman,D.W. ] / Petrology of igneous and metamorphic rocks
29 /
[ Taylor,S.R.;McLennan,S.M. ] / The continental crust: its composition and evolution
30 Diffusion of <TEX>$^40Ar$<TEX> i biotite: Temperature pressure and compositional effects /
[ Harrison,T.M.;Dunkan,I.;McDougall,I. ] / Geochim. Cosmochim. Acta.
31 Nomenclature of amphiboles: report of the subcommittee on amphiboles of the International Mineralonal Mineralogical Assiciation, commission on new minerals and mineral names /
[ Leake,B.E.;Woolley,A.R.;Arps,C.E.S.;Birch,W.D.;Gilbert,M.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.;Youzhi,G. ] / Can. Min.
32 Two Contrasting granite types /
[ Chappell,B.W.;White,A.J.R. ] / Pacific Geol.
33 Amphibole composition in tonalites as a fuction of pressure: an experimental calibration of the Al-in-hornblende barometer /
[ Schmidt,M.W. ] / Contrib. Mineral. Petrol.