Browse > Article
http://dx.doi.org/10.9719/EEG.2017.50.5.375

A Preliminary Study on the Igneous Layering and Concentration of Fe-Ti Oxide Minerals within Amphibolite in Soyeonpyeong Island  

Kim, Eui-Jun (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.50, no.5, 2017 , pp. 375-387 More about this Journal
Abstract
Amphibolite-hosted Fe-Ti mineralization at the Soyeonpyeong Island, located in central western part of the Korean Peninsula is a typical orthomagmatic Fe-Ti oxide deposit in South Korea. The amphibolite intruded into NW-SE trending Precambrian metasedimentary rocks. Lower amphibolite is characterized by igneous layering, consisting of feldspar-dominant and amphibole-Fe-Ti oxide-dominant layers. The igneous layering shows complicated and/or sharp contact. In contrast, upper amphibolite has a more complicated lithofacies (garnet-bearing, coarser, and schistose), and massive Fe-Ti oxide ore alternates with schistose amphibolite. NS- and EW-trending fault systems lead to redistribute upper amphibolite-hosted Fe-Ti orebody and igneous layering of lower amphibolite, respectively. The whole-rock compositions of amphibolite and Fe-Ti oxide ore reflect their constituent minerals. Amphibolite shows significantly positive Eu anomalies whereas Fe-Ti oxide ore has weak negative Eu anomalies. Plagioclase (Andesine to oligoclase) and Fe-Ti oxide minerals have constant composition regardless of their distribution. Amphibole has a compositionally variable but it doesn't reflect the chemical evolution. Mineral compositions within individual layers and successive layers are relatively constant not showing any stratigraphic evolution. This suggests that there are no successive injections of Fe-rich magma or assimilation with Fe-rich country rocks. Contrasting Eu anomalies between amphibolite and Fe-Ti oxide ore also suggest that extensive plagioclase fractionation during early crystallization stage cause increase in $Fe_2O_3/FeO$ ratio and overall Fe contents in the residual magma. Thus, Fe-rich residual liquids may migrate at the upper amphibolite by filter pressing mechanism and then produce sheeted massive Fe-Ti mineralization during late fractional crystallization.
Keywords
Amphibolite; orthomagmatic Fe-Ti deposit; igneous layering; plagioclase fractionation; filter pressing;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Das, S.K. and Mukherjee, S. (2001) Mineralogy geochemistry of V-Ti magnetite deposits of Mayurbhanj basic igneous complex, Orisssa. Indian Mineralogist, v.35, p.134-150.
2 Hodson, M.E. (1998) The origin of igneous layering in the Nunarssuit Syenite, South Greenland. Mineral. Mag., v.62, p.9-27.   DOI
3 Irvine, T.N. (1975) Crystallization sequences in the Muskox intrusion and other layered intrusions-II. Origin of chromitite layers and similar deposits of other magmatic ores. Geochim Cosmochim Acta, v.39, p.991-1020.   DOI
4 Zhou, M.F., Robinson, P.T., Leshcer, C.M., Keays, R.R., Zhang, C.J. and Malpas, J. (2005) Geochemistry, petrogenesis, and metallogenesis of the Panzhihua gabbroic layered intrusion and associated Fe-Ti-V oxide deposits, Sichuan province, SW China. J. Petrol., v.46, p.2253-2280.   DOI
5 Irvine, T.N., Andersen, J.C.O. and Brooks, C.K. (1998) Included blocks (and blocks within blocks) in the Skaergaard intrusion: geologic relations and the origins of rhythmic modally graded layers. Geol. Soc. Am. Bull., v.110, p.1398-1447.   DOI
6 Kim, K.H. and Hwang, S.J. (2000) Mineralogical and geochemical studies of titaniferous iron ores and ultramafic to mafic rocks from the Boreumdo iron ore deposits, South Korea. Econ. Environ. Geol., v.33, p.1-18.
7 Kim, K.H. and Lee, J.E. (1994) Petochemisty of the Soyeonpyeong titaniferous iron ore deposits, South Korea. Econ. Environ. Geol., v.27, p.345-362.
8 Bai, Z.J., Aiiong, H., Naldrett, A.J., Ziiu, W.G. and Xu, G.W. (2012) Whole-rock and mineral composition constraints on the genesis of the Giant Hongge Fe-Ti-V oxide deposit in the Emeishan large igneous province, Southwest China. Econ. Geol., v.107, p.507-524.   DOI
9 Barbey, P. (2009) Layering and schlieren in granitoids: a record of interactions between magma emplacement, crystallization, and deformation in growing plutons. Geol. Gelg., v.12, p.109-133.
10 Cawthorn, R.G. and Ashwal, L.D. (2009) Origin of anorthosite and magnetite layers in the Bushveld complex, constrained by major element compositions of plagioclase. J. Petrol., v.50, p.1607-1637.   DOI
11 Chang, H.W., Yum, B.W. and Park, N.Y. (1987) Petrochemical study on the alkaline gabbroic host rocks of titaniferous magnetite deposits in Gonamsan, Yeoncheon-Gun, South Korea. J. Korean Inst. Mining Geol., v.20, p.85-95.
12 Pang, K.N., Zhou, M.F., Lindsley, D., Zhao, D. and Malpas, J. (2008) Origin of Fe-Ti oxide ores in mafic intrusions: evidence from the Panzhihua intrusion, SW China. J. Petrol., v.49, p.295-313.
13 Klemm, D.D., Henckel, J., Dehm, R. and Von Gruenewaldt, G. (1985) The geochemistry of titanomagnetite in magnetite layers and their host rocks of the Eastern Bushveld complex. Econ. Geol., v.80, p.1075-1088.   DOI
14 Leake, B.E. (1978) Nomenclature of amphiboles. American Mineralogists, v.63, p.1023-1058.
15 Charlier, B., Namur, O., Toplis, M.J., Schiano, P., Cluzel, N., Higgins, M.D. and Vanver Auwera, J. (2011) Largescale silicate liquid immiscibility during differentiation of tholeiitic basalt to granite and the origin of the Daly gap. Geology, v.39, p.907-910.   DOI
16 Lee, I.G., Jun, Y. and Choi, S.H. (2017) Ore mineralization of the Hadong Fe-Ti-bearing ore bodies in the Hadong-Sancheong anorthosite complex. Econ. Environ. Geol., v.50, p.35-44.   DOI
17 Lee, J.H., Park, N.Y. and Oh, I.S. (1965) Report on the Soyeonpyong-do titaniferous magnetite deposits. Technical report on geological survey 8, Korea Institute of Geoscience and Mineral Resources, p.5-40.
18 Lister, G.F. (1966) The composition and origin of selected iron-titanium deposits. Econ. Geol., v.61, p.275-310.   DOI
19 Naslund, H.R. and McBirney, A.R. (1996) Mechanism of formation of igneous layering. In: Cawthorn RG (ed.) Layered intrusions. Elsevier, Amsterdam, pp.1-43.
20 Parsons, I. (1979) The Klokken gabbro-syenite complex, South Greenland: cryptic variation and origin of inversely-graded layering. J. Petrol., v.20, p.653-694.   DOI
21 Reynolds, I. (1985) The nature and origin of titaniferous magnetite-rich layers in the upper zone of the Bushveld complex: a review and synthesis. Econ. Geol., v.80, p.1089-1108.   DOI
22 So, C.S. (1977) Origin of the strata-bound magnetite ore from the Pocheon iron mine, Korea. J. Korean Inst. Mining Geol., v.13, p.249-262.
23 Wager, L.R. and Brown, G.M. (1968) Layered Igneous Rock. Oliver and Boyd, Edingurgh, p. 588.
24 So, C.S., Kim, S.M. and Son, D.S. (1975) Origin of the magnetite-bearing amphibolite from the Yangyang iron mine, Korea: New geochemical data and interpretation. J. Korean Inst. Mining Geol., v.8, p.175-182.
25 Lee, C.H. and Lee, S.H. (1989) Petrological studies on the genesis of the Hongcheon iron deposits, Korea. J. Geol. Soc. Korea, v.25, p.239-258.