The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Geochemical Studies of Petrogenesis of Hornblende Gabbro-Lamprophyre-Diorite Complex in Guwoonri, Hwacheon

화천 구운리 일대에 분포하는 각섬석 반려암-황반암-섬록암 복합체의 성인에 대한 지화학적 연구

  • Published : 2009.06.30
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Abstract

Hornblende gabbro-lamprophyre-diorite Complex in Guwoonri, Hwacheon distributes in a zonal pattern, where the diorite distributed along the margin of the Complex encompasses the hornblende gabbro body in the central part of the Complex, and lamprophyre intruded in vein along the boundary between diorite and hornblende gabbro. The hornblende gabbro in the central part of the Complex also shows a zonal distribution pattern, where hornblende gabbro containing subspherical amphibole phenocrysts as a major mafic mineral(Sag) surrounds hornblende gabbro with prismatic amphiboles as a principal mafic mineral(Pag). The zonal distributions observed in hornblende gabbro-lamprophyre-diorite Complex in Guwoonri resulted from two different geological processes. The zonal distribution among diorite, lamprophyre, and hornblende gabbro was due to intrusions of three distinct magmas derived from different degree of partial melting of a common source rock, whereas the zonal distribution shown within the hornblende gabbro body occupying the central part of the Complex resulted from an inward fractional crystallization of a single magma. Geochemical characteristics and mineral mode of hornblende gabbro, lamprophyre, and diorite indicate that these rocks formed from hydrous mafic to intermediate magma derived from partial melting of enriched mantle, which has been caused by infiltration of volatiles including water into mantle in plate margin.

화천군 구운리 일대에 분포하는 각섬석 반려암-황반암-섬록암 복합체는 암체의 중앙부에 각섬석 반려암체가 넓게 분포하고 소규모로 산출되는 섬록암이 가장자리를 따라 분포하며, 이들 두 암상의 경계부를 따라 맥상으로 관입한 황반암이 존재하는 누대분포 양상을 하고 있다. 복합암체의 중앙부에 분포하는 각섬석 반려암체 또한 휘석의 가상조직을 가지며 아구형의 각섬석 반정을 주요 유색광물로 가지는 각섬석 반려암(Sag)이 주상형의 각섬석을 주요 유색광물로 갖는 각섬석 반려암(Pag)을 둘러싸는 누대분포 양상을 하고 있다. 이러한 누대분포양상은 두 가지 서로 다른 지질학적인 작용에 의해서 형성되었다. 섬록암, 황반암 및 각섬석 반려암 사이에서 관찰되는 누대분포 양상은 동일 근원암으로부터 정도를 달리하는 부분용융에 의해 생성된 서로 다른 마그마의 관입에 의해 생성된 반면에, 복합암체의 중앙부에 분포하는 각섬석 반려암체내에서 관찰되는 Sag와 Pag 사이에서 관찰되는 누대분포 양상은 동일한 마그마로부터 암체 내부를 향해 일어난 분별정출 작용의 결과로 형성되었다. 각섬석반려암, 황반암 및 섬록암에서 관찰되는 광물 조성 및 지화학적인 특징은 이들 암석들이 판 경계부에서 다량의 물을 포함한 휘발성 유체가 유입된 부화된 맨틀물질의 부분용융에 의해 생성된 것임을 지시한다.

Keywords

References

  1. 김관영, 2007, 춘천시 오탄리와 화천군 구운리 일대에 분포하는 고철질-중성 관입암체의 성인에 대한 암석학적· 지화학적 연구. 강원대학교 석사 학위논문, 195p
  2. 김관영, 박영록, 2006, 암체 내부를 향한 분별정출작용: 화천군 구운리 일대에 분포하는 고철질-중성 심성암체의 성인에 대한 의미, 2006년도 한국암석학회·한국광물학회 공동학술발표회 논문집, 61p
  3. 김관영, 박영록, 2009, 화천 구운리와 춘천 오탄리 일대에 분포하는 각섬석 반려암체내에 존재하는 각섬석류의 산출양상 및 생성작용, 2009년도 한국광물학회ㆍ한국암석학회 공동학술발표회 논문집, 154p
  4. 박기화, 이병주, 조등룡, 김정빈, 1997, 한국지질도(1:50,000), 화천도폭 및 설명서. 33p
  5. 박영석, 김정빈, 박기화, Jiangfeng Chen, 김 진, 1999, 오탄리 지역에 분포하는 중성-염기성 심성암류에 대한 암석화학적 연구. 지구과학회지, 20, 544-555
  6. Bea, F., Fershtater, G.B. and Montero, M.P., 1997, Generation and evolution of subduction-related batholiths of the central Urals: constraints on the P-T history of the Uralian Orogen. Tectonophysics, 276, 103-116 https://doi.org/10.1016/S0040-1951(97)00051-6
  7. Boynton, W.V., 1984, Geochemistry of the rare earth elements: meteorite studies. In: Henderson P. (ed), Rare earth element geochemistry. Elsevier, 63-114
  8. Davidson, J.P., 1987, Crustal contamination versus subduction zone enrichment: example from the Lesser Antilles and implications for mantle source composition of Island arc volcanic rocks. Geochim. Cosmochim. Acta., 51, 2185-2198 https://doi.org/10.1016/0016-7037(87)90268-7
  9. Elliot, T., Plank, T. and Zindler, A., 1997, Element transport from slab to volcanic front at the Mariana Arc. J. Geophys. Res., 102, 14991-15019 https://doi.org/10.1029/97JB00788
  10. Fershtater, G.B., Bea, F., Montero, P. and Scarrow, J., 2004, Hornblende gabbro in the Urals: Types, Geochemistry, and Petrogenesis, Geochemistry international, 42, 610-629
  11. Floyd P.A., Yaliniz M.K. and Goncuoglu M.C., 1998, Geochemistry and petrogenesis of intrusive and extrusive ophiolitic plagiogranites, Central Anatolian Crystalline Complex, Turkey. Lithos, 42, 225-241 https://doi.org/10.1016/S0024-4937(97)00044-3
  12. Grove, T.L., Parman, S.W. and Bowring, S.A., 2000, The role of an $H_2O$-rich fluid in the generation of primitive basaltic andesites from the Mt. Shasta Region, N. California. Cont. Mineral. Petrol., 142, 375-396 https://doi.org/10.1007/s004100100299
  13. Jackson, T.A., Lewis, J.F., Scot, P.W. and Manning, P.A.S., 1998, The Petrology of Lamprophyre Dykes in the Above Rocks Granitoid, Jamaica: Evidence of rifting above a subduction zone during the early Tertiary. Caribbean Journal of Science, 34, 1-11
  14. Jahns, R.H. and Burnham, C.W., 1969, Experimental studies of pegmatite genesis: Part 1, A model for the derivation and crystallization of granite pegmatites. Economic Geol., 64, 843-864 https://doi.org/10.2113/gsecongeo.64.8.843
  15. Kepezhinskas, P., McDermott, F. and Defant, M.J., 1997, Trace element and Sr-Nd-Pb isotope constraints on a three component model of Kamchatka arc petrogenesis. Geochim. Cosmochim. Acta, 61, 577-600 https://doi.org/10.1016/S0016-7037(96)00349-3
  16. Kim, C.B., Park, Y.S., Chang, H.W. and Turek, A., 1999, Geochronology, Petrology and Tectnics of Triassic-Jurassic plutonic rocks of the Ryeongnam and Gyeonggi Massifs, Korea. ICOG-9(The Ninth International Conference on Geochronology, Cosmochronology and Isotope Geology), 65p
  17. Kocak, K., Isil, F., Arslan, M. and Zedef, V., 2005, Petrological and source region characteristics of ophiolitic hornblende gabbros from the Aksaray and Kayseri regions, central Anatolian crystalline complex, Turkey. J. Asian Earth Sci., 25, 883-891 https://doi.org/10.1016/j.jseaes.2004.08.006
  18. Lofgren, G.E., 1980, Experimental studies on the dynamic crystallization of silicate melts. In Hargraves, R.B.(eds), Physics of Magmatic Processes. Princeton Univ. Press, Princeton, N.J., 487-565
  19. Nakamura N., 1974, Determination of REE, Ba, Fe, Mg, and K in carbonaceous and ordinary chondrites. Geochim. Cosmochim. Acta, 38, 757-775 https://doi.org/10.1016/0016-7037(74)90149-5
  20. Nockolds, S.R., 1954, Average compositions of some igneous rocks. Bull. Geol. Soc. Am., 65, 1007-1032 https://doi.org/10.1130/0016-7606(1954)65[1007:ACCOSI]2.0.CO;2
  21. Pawley, A.R. and Holloway, J.R., 1993, Water source for subduction zone volcanism: New experimental constraints. Science, 260, 664-667 https://doi.org/10.1126/science.260.5108.664
  22. Pearce J.A., 1982, Trace element characteristics of lavas from destructive plate boundaries. In: Thorpe R.S. (ed.), Andesites. Wiley, Chichester, 525-548
  23. Pearce J.A., 1983, Role of the sub-continental lithosphere in magma genesis at active continental margins. In: Hawkesworth C.J. And Norry M.J. (eds.), Continental basalts and mantle xenoliths. Shiva, Nantwich, 230-249
  24. Pearce, J.A. and Gale, G.H., 1977, Identification of ore-deposition environment from trace element analyses. Earth Planet. Sci. Lett., 12, 339-349
  25. Rock, N.M.S., 1977, The nature and origin of lamprophyres: Some definitions, distinctions, and derivations. Earth-Science Reviews, 13, 123-169 https://doi.org/10.1016/0012-8252(77)90020-4
  26. Rock, N.M.S., 1983, Nature and origin of calc-alkaline lamprophyre; minettes, vogesites, kersantites and sperssartite. Transactions of the Royal Society of Edinburgh: Earth Sciences, 74, Part 4, 193-227
  27. Rock, N.M.S., 1987, The nature and origin of lampro phyres: an overview. In alkaline igneous rocks, Fitton, J.G. and Upton, B.G.J.(eds), Geol Soc. Sp. Publ., 30, 191-226 https://doi.org/10.1144/GSL.SP.1987.030.01.09
  28. Rock, N.M.S., 1991, Lamprophyres. Blackie, Glasgow, UK. 285p
  29. Rock, N.M.S., Gaskarth, J.W. and Rundle, C.C., 1986, Late Caledonian dyke-swarms in southern Scotland: A regional zone of primitive K-rich lamprophyres and associated vents. Journal of Geology, 94, 505-522 https://doi.org/10.1086/629054
  30. Sun S.S. and Mcdonough W.F., 1989, Chemical and isotopic systematic of oceanic basalts: implications for mantle composition and processes. In: Saunders A.D. and Norry M.J.(eds.), Magmatism in ocean basins. Geol. Soc. London. Spec. Pub, 42, 313-345 https://doi.org/10.1144/GSL.SP.1989.042.01.19
  31. Swanson, S.E., 1977, Relation of nucleation and crystalgrowth rate to the development of granitic textures. American Mineralogist, 62, 966-978
  32. Thorpe, R.S., Gaskarth, J.W. and Henney, P.J., 1993, Composite Ordovician lamprophyre(spessartite) intrusions around the Midlands Microcraton in central Britian. Geol. Magazine, 130, 657-663 https://doi.org/10.1017/S0016756800020963