[논문]에오세 경주 A-형 화강암의 기원: 높은 불소 함량에 대한 고찰

명보라; 김정훈; 우현동; 장윤득

doi:10.9719/eeg.2018.51.5.439

에오세 경주 A-형 화강암의 기원: 높은 불소 함량에 대한 고찰
Origin of the Eocene Gyeongju A-type Granite, SE Korea: Implication for the High Fluorine Contents 원문보기

자원환경지질 = Economic and environmental geology, v.51 no.5, 2018년, pp.439 - 453

명보라 (한국해양과학기술원 심해저광물자원연구센터) , 김정훈 (경상북도청 환경정책과) , 우현동 (한국원자력안전기술원 구조.부지평가실) , 장윤득 (경북대학교 지질학과)

초록
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한반도 남동부에 분포하는 에오세 경주 화강암체들은 양산단층과 울산단층을 따라 분포하며, 알칼리장석화강암(AGR), 흑운모화강암(BTGR), 각섬석흑운모화강섬록암으로 분류된다. 지화학적 특성에 따라 이들은 A-형 화강암 (AGR)과 I-형 화강암 (BTGR)로 분류되며, 상부맨틀 내의 같은 모마그마로부터 유래한 것으로 생각된다. AGR의 경우, 유색광물들 (각섬석, 흑운모)이 간극상으로 관찰되는데 이는 AGR 마그마의 결정화 동안 Fluorine (F)이 풍부한 유체가 유입되었을 것으로 생각된다. AGR은 친석원소와 (Sr, Ba 제외) 경희토류원소의 함량이 높으며, 이는 섭입대에서 유래한 유체의 영향으로 생각된다. 에오세 경주 화강암체 중 AGR의 가장 높은 고장력원소 함량과 저어콘포화온도는 마그마 결정분화보다는 부분용융의 영향으로 판단된다. 이들 특징들은 AGR의 높은 F 함량이 섭입슬랩에서 유래한 F이 풍부한 유체와 부분 용융의 영향을 나타내는 것으로 추정할 수 있다. 또한 이러한 결과는 이 연구에서 수행한 희토류원소와 Ba/Th 모델링과도 일치한다. 따라서 이 연구에서는 AGR은 BTGR의 부분용융과 섭입슬랩에서 유래한 F이 풍부한 유체의 유입의 영향이 합쳐져 형성된 것으로 판단하였다.

Abstract ▼ AI-Helper

The Eocene Gyeongju granitoids in SE Korea are alkali feldspar granite (AGR), biotite granite (BTGR), and hornblende biotite granodiorite (HBGD) along Yangsan fault and Ulsan fault. According to their geochemical characteristics, these granitoids are classified as A-type (AGR) and I-type (BTGR and HBGD) granitoids, and regarded that were derived from same parental magma in upper mantle. The hornblende and biotite of AGR as an interstitial phase indicate that influx of F-rich fluid during the crystallization of AGR magma. AGR is enriched LILE (except Sr and Ba) and LREE that indicate the influences for subduction released fluids. The highest HFSE contents and zircon saturation temperature of AGR among the Eocene Gyeongju granitoids may indicate that it was affected by partial melting rather than magma fractionation. These characteristics may represent that the high F contents of AGR was affected by F-rich fluid derived from the subducted slab and partial melting. It corresponds with the results of the REE modeling and the dehydrated fluid component (Ba/Th) modeling showing that AGR (A-type) was formed by the partial melting of BTGR (I-type) with the continual influx of F-rich fluid derived from the subducted slab.

주제어

표/그림 (14)

그림 Fig. 1. Geological map of the study area. (1) Daegu Formation, (2) Hornblende-biotite granodiorite (HBGD), (3) Biotite granite (BTGR), (4) Alkali feldspar granite (AGR), (5) Tertiary volcanic rocks, and (6) Alluvium. The Eocene Gyeongju granitoids including HBGD, BTGR, and AGR are located along the Yangsan fault and the Ulsan fault.
표 Table 1. Chemical composition of major elements and trace elements of the Eocene Gyeongju granitoids
표 Table 1. Continued
그림 Fig. 2. Harker variation diagrams for major oxides of the Eocene Gyeongju granitoids. These data in this study are consistent with those in Koh et al. (1996) and Kim and Kim (1997).
그림 Fig. 3. Harker variation diagrams for trace elements of the Eocene Gyeongju granitoids. AGR has higher Zr, Nb, Rb, and Th and lower Sr and Ba contents than BTGR and HBGD. These data in this study are consistent with those in Koh et al. (1996) and Kim and Kim (1997). The legend is same as those in Fig. 2.
그림 Fig. 4. Y-Nb-Ce plots and Y-Nb-3Ga plots suggested by Eby (1992). AGR may have been originally introduced through mantle metasomatism by subduction released fluids (Li et al. 2012; Li et al. 2014). These data in this study are consistent with those in Koh et al. (1996) and Kim and Kim (1997). The legend is same as those in Fig. 2.
그림 Fig. 6. Rb versus Y+Nb tectonic discrimination plot (Pearce et al., 1984). Symbols are the same as Fig. 2. syn-COLG: syn-collision granite, WPG: within plate granite, VAG: volcanic arc granite, ORG: ocean ridge granite.
그림 Fig. 5. (a) Primitive mantle-normalized Spider diagram and (b) Chondrite-normalized REE patterns of the Eocene Gyeongju granitoids. The normalization values are suggested by Sun and McDonough (1989). AGR is enriched with rare earth elements (REE), with the exception of strong negative Eu anomalies, compared with BTGR and HBGD. These data in this study are consistent with those in Koh et al. (1996) and Kim and Kim (1997).
그림 Fig. 7. Zircon saturation temperatures for the Eocene Gyeongju granitoids. The diagram represents that AGR magma is higher temperature than BTGR and HBGD. The legend is same as those in Fig. 2.
표 Table 2. REE modeling. The calculations were made using the mineral/melt partition coefficients of Arth (1976) and Nash and Crecraft (1985)
그림 Fig. 8. REE modeling diagram. We assumed that HBGD formed BTGR, and then BTGR formed AGR. (a) The model result was estimated by the partial melting equation using HBGD composition. (b) The modeled result was estimated by the partial melting equation using BTGR composition. These data in this study are consistent with those in Koh et al. (1996) and Kim and Kim (1997).
그림 Fig. 9. Trace element modeling diagram for the dehydrated fluid component. The dehydrated fluid component (Ba/Th) represents the effect of the fluid released by the partial melting of the subducted slab. We first model Ba/Th considering the effect of partial melting and the modeling represents that the actual value is higher than the model value. The results reveal that the dehydrated fluid component contributed a maximum of 28% to BTGR and 40% to AGR. In this diagram, we can recognize that AGR was affected by the dehydrated fluid components as well as partial melting.
표 Table 3. Trace element modeling for dehydration fluid components. The mineral/melt partition coefficients in these calculations are same as Table 2
그림 Fig. 10. Comprehensive model depicting the generation of the HGBD, BTGR, and AGR by stages. The Pacific plate was subducted, and F-rich fluid formed by mineral dehydration. Then, the fluid was transported through the overlying mantle wedge to the magma continually. (a) In the upper mantle (i.e., lithospheric mantle), the basaltic magma was underplated, which formed the parental magma. Then, the parental magma formed HBGD. Ongoing lithospheric extension and slab roll-back resulted in an upwelling of the hot asthenospheric mantle and the continual influx of heat into the lithospheric mantle. (b) BTGR was formed by the partial melting of HBGD. (c) AGR was formed last by the partial melting of BTGR with the F-rich fluid derived from the subducted slab.

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문제 정의

In this study, we focus on the origin of AGR based on its high F contents. AGR has interstitial hornblende and biotite indicating the implication of F-rich fluid and it is enriched LILE (except Ba and Sr) and LREE induced by subduction-released fluids.

가설 설정

3) The F contents can be accumulated by F-rich fluid derived from subduction slab. AGR was emplaced on the subduction-related environment (i.

제안 방법

Given the high temperature origin of AGR and REE modeling, we concluded that this model is applicable to petrogenesis of AGR. However, with regard to the probability that AGR may be affected by partial melting and F-rich fluid derived from the dehydration of subduction slab in Sections 5.1 and 5.2, we propose a new petrogenesis model in which the A-type granite was formed by partial melting of I-type granite with an influx of the F-rich fluid derived from the subducted slab.

대상 데이터

The samples were analyzed for major oxides and selected trace elements (Sc, Be, V, Ba, Sr, Y, and Zr) using a Varian Vista 735 ICP; other trace elements were analyzed using a Perkin Elmer Sciex ELAN 6000. Calibration was performed using seven USGS and CANMET certified reference materials. One of the seven standards was used during the analysis for every group of 10 samples.
We collected the 20 rock samples of the Eocene Gyeongju granitoids throughout the study area. Selected 15 samples including 6 ones for AGR, 5 for BTGR, and 4 for HBGD were prepared for thin sections. Polarizing microscope was used to describe the petrological characteristics of the rocks.
The chemical analysis, using an inductively coupled plasma mass spectrometer (ICP-MS), was conducted in the Activation Laboratory, Canada. The samples were analyzed for major oxides and selected trace elements (Sc, Be, V, Ba, Sr, Y, and Zr) using a Varian Vista 735 ICP; other trace elements were analyzed using a Perkin Elmer Sciex ELAN 6000. Calibration was performed using seven USGS and CANMET certified reference materials.
The Cretaceous-Tertiary Gyeongsang Arc proposed by Chough and Sohn (2010) to collectively refer to the arc platform and adjacent to Gyeongsang Basin is located in the southeast part of the Korean Peninsula. The study area is located in the south of Gyeongju, which tectonically lies in the eastern part of the Gyeongsang Arc along the Yangsan fault and Ulsan fault. It is mainly composed of the Cretaceous sedimentary rocks (called the Daegu Formation), the late Cretaceous granitic rocks, the early Tertiary granitic rocks (i.

성능/효과

The result reveals that the dehydrated fluid component contributed a maximum of 28% to BTGR and 40% to AGR (Fig. 9, Table 3). These results are well supported by interstitial F-rich minerals of AGR and the highest contents of LILE (except for Sr and Ba) and LREE among the Eocene Gyeongju granitoids as presented earlier.
We first model Ba/Th considering the effect of partial melting and the modeling represents that the actual value is higher than the model value. The results reveal that the dehydrated fluid component contributed a maximum of 28% to BTGR and 40% to AGR. In this diagram, we can recognize that AGR was affected by the dehydrated fluid components as well as partial melting.
The results show that AGR has the temperature ranging from 842 ℃ to 972 ℃ using the equation of Watson and Harrison (1983), whereas BTGR and HBGR have the temperatures in the range of 757−878 ℃ and 681−772 ℃, respectively (Fig. 7), representing the reverse correlation with the tendency in SiO2 contents (Figs. 2 and 3).
Zircon is hence efficiently utilized as an indicator of the magma formation temperature (Watson and Harrison, 1983). Therefore, this study assumed that T_Zr could help induce the early emplacement environment of GyeongsangBasin granitoids. A notable concept is that the interpretation of the calculated zircon saturation temperature varies, depending on whether or not an inherited core within the zircon exists.

참고문헌 (50)

Agangi, A., Kamenetsky, V.S. and McPhie, J. (2010) The role of fluorine in the concentration and transport of lithophile trace elements in felsic magmas: Insights from the Gawler Range Volcanics, South Australia. Chem Geol., v.273, p.314-325.

상세보기
Anderson, I.C., Frost, C.D. and Frost, B.R. (2003) Petrogenesis of the Red Mountain pluton, Laramie anorthosite complex, Wyoming: implications for the origin of A-type granite. Precambrian Res., v.124, p.243-267.

상세보기
Anderson, J.L. (1983) Proterozoic anorogenic granite plutonism of North America. Geological Society of America Memoirs., v.161, p.133-154.
Arth, J.G. (1976) Behavior of trace elements during magmatic processes: a summary of theoretical models and their applications. J. Res. US Geol. Surv.;(United States). p.4.
Banno, S., Sakai, C. and Higashino, T. (1986) Pressure-temperature trajectory of the Sanbagawa metamorphism deduced from garnet zoning. Lithos, v.19, p.51-63.

상세보기
Bohlen, S.R., Boettcher, A., Wall, V. and Clemens, J. (1983) Stability of phlogopite-quartz and sanidine-quartz: a model for melting in the lower crust. Contributions to Mineralogy and Petrology, v.83, p.270-277.

상세보기
Bonin, B. (2007) A-type granites and related rocks: Evolution of a concept, problems and prospects. Lithos, v.97, p.1-29.

상세보기
Bromiley, D.W. and Kohn, S.C. (2007) Comparisons between fluoride and hydroxide incorporation in nominally anhydrous and fluorine-free mantle minerals. Geochim Cosmochim Ac., v.71, p.124-124.
Chappell, B.W. and Stephens, W.E. (1988) Origin of infracrustal (I-type) granite magmas. Earth and Environmental Science Transactions of the Royal Society of Edinburgh., v.79, p.71-86.

상세보기
Charoy, B. and Raimbault, L. (1994) Zr-, Th-, and REErich biotite differentiates in the A-type granite pluton of Suzhou (Eastern China): the key role of fluorine. Journal of Petrology, v.35, p.919-962.

상세보기
Cheong, A.C.-S. and Jo, H.J. (2017) Crustal evolution in the Gyeongsang Arc, southeastern Korea: Geochronological, geochemical and Sr-Nd-Hf isotopic constraints from granitoid rocks. American Journal of Science, v.317, p.369-410.

상세보기
Chough, S. and Sohn, Y. (2010) Tectonic and sedimentary evolution of a Cretaceous continental arc-backarc system in the Korean peninsula: new view. Earth-Science Reviews., v.101, p.225-249.

상세보기
Clemens, J.D., Holloway, J.R., and White, A.J.R. (1986) Origin of an A-type granite: experimental constraints. American Mineralogist, v.71, p.317-324.
Collins, W., Beams, S., White, A. and Chappell, B. (1982) Nature and origin of A-type granites with particular reference to southeastern Australia. Contributions to Mineralogy and Petrology, v.80, p.189-200.

상세보기
Creaser, R.A., Price, R.C. and Wormald, R.J. (1991) A-type granites revisited: assessment of a residual-source model. Geology, v.19, p.163-166.

상세보기
Delany, J.M. and Helgeson, H.C. (1978) Calculation of the thermodynamic consequences of dehydration in subducting oceanic crust to 100 kb and> 800 degrees C. American Journal of Science, v.278, p.638-686.

상세보기
Eby, G.N. (1990) The A-type granitoids: A review of their occurrence and chemical characteristics and speculations on their petrogenesis. Lithos, v.26, p.115-134.

상세보기
Eby, G.N. (1992) Chemical Subdivision of the A-Type Granitoids - Petrogenetic and Tectonic Implications. Geology., v.20, p.641-644.

상세보기
Edgar, A.D., Pizzolato, L.A. and Sheen, J. (1996) Fluorine in igneous rocks and minerals with emphasis on ultrapotassic mafic and ultramafic magmas and their mantle source regions. Mineral Mag., v.60, p.243-257.

상세보기
Ellis, D.J. (1986) Garnet-liquid Fe (super 2+)-Mg equilibria and implications for the beginning of melting in the crust and subduction zones. American Journal of Science, v.286, p.765-791.

상세보기
Hsu, L.C. (1968) Selected phase relationships in the system Al-Mn-Fe-Si-OH: A model for garnet equilibria. J Petrol., v.9, p.40-83.
Hwang, B.H., McWilliams, M., Son, M. and Yang, K. (2007) Tectonic implication of A-type granites across the Yangsan fault, Gigye and Gyeongju areas, Southeast Korean Peninsula. Int. Geol. Rev., v.49, p.1094-1102.

상세보기
Imaoka, T., Kiminami, K., Nishida, K., Takemoto, M., Ikawa, T., Itaya, T., Kagami, H. and Iizumi, S. (2011) K-Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene-Oligocene thermo-tectonic reactivation. J. Asian Earth Sci., v.40, p.509-533.

상세보기
Jiang, Y.H., Ling, H.F., Jiang, S.Y., Fan, H.H., Shen, W.Z. and Ni, P. (2005) Petrogenesis of a Late Jurassic peraluminous volcanic complex and its high-Mg, potassic, quenched enclaves at Xiangshan, southeast China. J. Petrol., v.46, p.1121-1154.

상세보기
Kim, C.-S. and Kim, G.-S. (1997) Petrogenesis of the early Tertiary A-type Gyeongju alkali granite in the Kyongsang Basin, Korea. Geosciences Journal., v.1, p.99-107.

상세보기
King, P.L., White, A.J.R., Chappell, B.W. and Allen, C.M. (1997) Characterization and origin of aluminous A-type granites from the Lachlan Fold Belt, Southeastern Australia. J. Petrol., v.38, p.371-391.

상세보기
Koh, J., Yun, S. and Lee, S. (1996) Petrology and geochemical characteristics of A-type granite with particular reference to the Gyeongju Granite, Kyeonju. Journal of the Petrological Society of Korea, v.5, p.142-160. (in Korean).
Kohler, J., Schonenberger, J., Upton, B. and Markl, G. (2009) Halogen and trace-element chemistry in the Gardar Province, South Greenland: Subduction-related mantle metasomatism and fluid exsolution from alkalic melts. Lithos, v.113, p.731-747.

상세보기
Landenberger, B. and Collins, W. J. (1996) Derivation of A-type granites from a dehydrated charnockitic lower crust: Evidence from the Chaelundi complex, eastern Australia. J. Petrol., v.37, p.145-170.
Lee, M. (1995) Mineralogy and geochemistry of the granitic rocks distributed in the Kyeongju area. MS thesis, Seoul National University, Seoul.
Lee, M.J., Lee, J.I. and Lee, M.S. (1995) Mineralogy and major element geochemistry of A-type alkali granite in the Kyeongju area, Korea. Journal of the Geological Society of Korea, v.31, p.583-607.

상세보기
Li, H., Ling, M.-X., Ding, X., Zhang, H., Li, C.-Y., Liu, D.-Y. and Sun, W.-D. (2014) The geochemical characteristics of Haiyang A-type granite complex in Shandong, eastern China. Lithos, v.200, p.142-156.

상세보기
Li, H., Ling, M.-X., Li, C.-Y., Zhang, H., Ding, X., Yang, X.-Y., Fan, W.-M., Li, Y.-L. and Sun, W.-D. (2012) A-type granite belts of two chemical subgroups in central eastern China: indication of ridge subduction. Lithos, v.150, p.26-36.

상세보기
Loiselle, M. and Wones, D. (1979) Characteristics and origin of anorogenic granites. Geological Society of America Abstracts with Programs, p.468.
Miller, C.F., McDowell, S.M. and Mapes, R.W. (2003) Hot and cold granites? Implications of zircon saturation temperatures and preservation of inheritance. Geology, v.31, p.529-532.

상세보기
Mushkin, A., Navon, O., Halicz, L., Hartmann, G. and Stein, M. (2003) The petrogenesis of A-type magmas from the Amram Massif, southern Israel. J. Petrol., v.44, p.815-832.

상세보기
Nash, W. and Crecraft, H. (1985) Partition coefficients for trace elements in silicic magmas. Geochim. Cosmochim. Ac., v.49, p.2309-2322.

상세보기
Patino Douce, A.E. (1997) Generation of metaluminous Atype granites by low-pressure melting of calc-alkaline granitoids. Geology, v.25, p.743-746.

상세보기
Pearce, J.A. and Stern, R.J. (2006) Origin of back-arc basin magmas: Trace element and isotope perspectives. Back-Arc Spreading Systems: Geological, Biological, Chemical, and Physical Interactions, p.63-86.
Pearce, J.A., Harris, N.B. and Tindle, A.G. (1984) Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, v.25, p. 956-983.
Pearce, J.A., Stern, R.J., Bloomer, S.H. and Fryer, P. (2005) Geochemical mapping of the Mariana arc-basin system: Implications for the nature and distribution of subduction components. Geochem Geophy Geosy, p.6.
Rudnick, R.L. and Taylor, S.R. (1987) The composition and petrogenesis of the lower crust: a xenolith study. Journal of Geophysical Research: Solid Earth, v.92, p.13981-14005.

상세보기
Smith, J., Delaney, J., Hervig, R. and Dawson, J. (1981) Storage of F and Cl in the upper mantle: geochemical implications. Lithos, v.14, p.133-147.

상세보기
Sun, S.S. and McDonough, W.S. (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Geological Society, London, Special Publications, v.42, p.313-345.

상세보기
Turner, S.P., Foden, J.D. and Morrison, R.S. (1992) Derivation of Some A-Type Magmas by Fractionation of Basaltic Magma - an Example from the Padthaway Ridge, South Australia. Lithos, v.28, p.151-179.

상세보기
Watson, E.B. and Harrison, T.M. (1983) Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types. Earth and Planetary Science Letters, v.64, p.295-304.

상세보기
Whalen, J.B., Currie, K.L. and Chappell, B.W. (1987) Atype granites: geochemical characteristics, discrimination and petrogenesis. Contributions to Mineralogy and Petrology, v.95, p.407-419.

상세보기
Wu, F.Y., Sun, D.Y., Li, H., Jahn, B.M and Wilde, S. (2002) A-type granites in northeastern China: age and geochemical constraints on their petrogenesis. Chemical Geology, v.187, p.143-173.

상세보기
Yun, S.H. and Hwang, I.H. (1990) Articles: Petrology and Geochemical Characteristics of the Granitic Rocks in Gyeongju Area, Kyeongju. Journal of the Korean Earth Science Society, v.11, p.51-51. (in Korean with English abstract)
Zhao, X.F., Zhou, M.F., Li, J.W. and Wu, F.Y. (2008) Association of Neoproterozoic A-and I-type granites in South China: implications for generation of A-type granites in a subduction-related environment. Chemical Geology, v.257, p.1-15.

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저장형식	Text(ASCII format) Excel format RefWorks Direct Export RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

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