Fig. 1. Geological map of the Dangjin area, western Gyeonggi Massif (modified from Lee et al., 1989; Shin et al.,1989; Choi et al., 2013, 2014) with U-Pb zircon ages (this study) and reference data and simple tectonic map of the Korean Peninsula and east China (modified from Oh and Kusky, 2007; Zhao et al., 2005). The geological map of Dangjin area has been modified based on the field survey. Abbreviations: NCC, North China Craton; JLJB, Jiao-Liao-Ji Belt; NM, Nangrim Massif; IB, Imjingang Belt; GM, Gyeonggi Massif; OMB, Okcheon Metamorphic Belt; TB, Taebacksan Basin; YM, Yeongnam Massif.
Fig. 2. Outcrop photographs of Mesozoic intrusive rocks: (a) medium- to fine-grained biotite granite (SS0903), (b) medium-grained leucogranite (SS0801, Samung-ri), (c-f) magma mixing and mingling zone (Mt. Ibe) in which various intrusive rocks occur, (d) granodiorite hosting mafic microgranular enclaves (MMEs), (e) igneous banded structure developed in granodiorite, (f) hand specimen of granodiorite hosting MME, (g) quartz gabbro (SS085A) intruding Precambrian country rock (biotite gneiss, SS0803) and hornblende (hbl) gabbro including evolved gabbroic pegmatite. The age dating results of (c) and (h) are taken from Zhai et al. (2016).
Fig. 3. Photomicrograph of Mesozoic intrusive rocks: (a) Triassic medium- to fine-grained biotite granite, (b) Jurassic medium-grained leucogranite (Samung-ri), (c) Jurassic porphyritic granodiorite hosting mafic microgranular enclave (MME), (d) Jurassic hornblende gabbro consisting mainly of plagioclase (Pl) and hornblende (Hbl), (e) Jurassic gabbroic pegmatite consisting of Pl, Hbl and quartz (Qtz) and (f) microcrystalline Jurassic MME hosting medium-grained Hbl and Pl. The photos (a, b and f) were taken under cross-polarized light, and the photos (c, d and e) were taken under plane-polarized light. Mineral abbreviations: biotite, Bt; orthoclase, Or; microcline, Mc; chlorite, chl; magnetite, Mt.
Fig. 4. Representative cathodoluminescence (CL) images of zircons and the spots of the SHRIMP U-Pb analyses with 206Pb/238U ages (Ma) of the Mesozoic intrusive rocks. The small-sized numbers are the spot numbers in Table 1.
Fig. 5. Zircon concordia diagrams with igneous ages (weighted mean of 238U/206Pb age and concordia age) of basement gneiss (biotite gneiss) and Mesozoic intrusive rocks: (a) biotite gneiss (SS0803), (b) biotite granite (SS0903), (c) leucogranite (SS0801, Samung-ri), (d) quartz gabbro (SS2808), (e) quartz gabbro (SS085A) and (f) hornblende gabbro (SS2702).
Fig. 6. Geochemical classification of Triassic biotite granite on (a) the total alkali vs. silica (TAS) diagram (after Middlemost, 1994) with subdivision into alkaline and subalkaline series (after McDonald and Katsura, 1964; McDonald, 1968; Kuno, 1966; Irvine and Baragar, 1971) and (b) the K2O vs. SiO2 diagram (after Peccerillo and Taylor, 1976). (c) Chondrite-normalized rare earth element (REE) and (d) normal mid-ocean ridge basalt (NMORB)-normalized multi-element variation diagrams of Triassic biotite granite. Reference data of the Haemi granite are taken from Choi et al. (2009). The normalization values are taken from Sun and McDonough (1989).
Fig. 7. Geochemical classification of Jurassic gabbroic rocks and granitoids on (a) the TAS diagram with subdivision into alkaline and subalkaline series and (b) the K2O vs. SiO2 diagram. The source of the original diagram is the same as those in Fig. 6.
Fig. 8. Chondrite-normalized REE and N-MORB-normalized multi-element variation diagrams of Jurassic gabbroic rocks and granitoids. The normalization values and upper continental (cont.) crust composition are taken from Sun and McDonough (1989) and Rudnick and Gao (2003), respectively. Abbreviation: OIB, ocean island basalt.
Fig. 9. Comparison of the studied Jurassic gabbros with Triassic gabbros from the central/eastern Gyeonggi Massif and Cretaceous mafic volcanic/subvolcanic rocks from the east-central China based on plots of their compositions on the tectonic discrimination diagram: (a) Th/Yb vs. Nb/Yb plot with MORB-OIB array and subduction enrichment fingerprint (Pearce, 2008) and (b) La/Ba vs. La/Nb plot (Su et al., 2012). Reference data are taken from Zhang (2007), Yi et al. (2016) and references therein. Abbreviation: CLM, continental (cont.) lithospheric mantle.
Fig. 10. Comparison of melt compositions derived by experimental dehydration (i.e., fluid absent)-melting of various crustal materials (Patiño Douce, 1999) with compositions of Triassic and Jurassic granitoids. Melt compositions obtained by dehydration melting of calc-alkaline granites at 4 kbar (low pressure) and 8 kbar (high pressure) by Patiño Douce (1997) are also presented for the comparison.
Table 1. SHRIMP U-Pb data for zircons from Mesozoic granitoids and gabbroic rocks and Precambrian country rock (biotite gneiss).
Table 1. Continued
Table 2. Representative major and trace element compositions of Mesozoic granitoids in the Dangjin area
Table 3. Representative major and trace element compositions of Jurassic gabbroic rocks in the Dangjin area
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