[논문]문경지질공원 쌍룡계곡, 용추계곡, 문경새재 지질명소 화성암류의 SHRIMP 저어콘 U-Pb 연령과 지구화학

정원석; 김윤섭; 한기운; 김태환

doi:10.22807/kjmp.2023.36.1.73

문경지질공원 쌍룡계곡, 용추계곡, 문경새재 지질명소 화성암류의 SHRIMP 저어콘 U-Pb 연령과 지구화학
SHRIMP Zircon U-Pb Age and Geochemistry of Igneous Rocks in the Ssangyong and Yongchu Valleys and Mungyeong Saejae Geosites, Mungyeong Geopark 원문보기

광물과 암석 = Korean journal of mineralogy and petrology, v.36 no.1, 2023년, pp.73 - 94

정원석 (충북대학교 자연과학대학 지구환경과학과) , 김윤섭 (충북대학교 자연과학대학 지구환경과학과) , 한기운 (충북대학교 자연과학대학 지구환경과학과) , 김태환 (극지연구소 지권연구본부)

초록
AI-Helper

문경 지질공원 후보지의 지질명소 쌍룡계곡, 용추계곡 그리고 문경새재를 구성하고 있는 화강암류와 규장질 관입암류의 저어콘 U-Pb 연령측정과 전암 지구화학 성분분석을 수행하였다. 이들 화성암류들은 각각 문경시의 서부, 북서부, 중부에 분포하고 있으며, 옥천변성대의 변성암류와 문경층군의 퇴적암류를 관입하고 있다. 고분해능 이차이온질량분석기(SHRIMP)를 사용하여 측정한 쌍룡계곡의 두 개의 규장질 반암과 한 개의 화강암 시료의 저어콘 U-Pb 연대측정 결과는 각각 93.9±3.3 Ma (tσ), 95.1±4.0 Ma (tσ) 그리고 94.4±2.0 Ma (tσ)으로 백악기 관입 연령을 정의한다. 용추계곡의 화강암, 규장질 암맥, 그리고 문경새재 반상 화강암에서 측정한 관입 연령은 각각 90.2±2.0 Ma (tσ), 91.0±3.0 Ma (tσ) 그리고 88.6±1.5 Ma (tσ)의 관입연령을 갖는다. 이 지역의 화강암 연대에 대한 기존 연구결과(Lee et al., 2010; Yi et al., 2014; Aum et al., 2019)와 더불어 계산한 평균표준오차를 계산해보면, 쌍룡계곡(94.5±0.2 Ma)과 용추계곡(89.7±0.4 Ma) 화강암들 사이에 대략 5 Myr 정도의 관입 시기의 차이가 존재함이 나타난다. 이 두 지역 사이의 문경지역의 규장질 화성암류의 지구화학 성분분석 결과는 후조산성 화강암 특성을 나타내며, 이는 초기 백악기 조산운동 및 이자나기의 섭입 말기의 화성활동에 대비된다.

Abstract ▼ AI-Helper

We carried out the sensitive high resolution ion microprobe (SHRIMP) zircon U-Pb age dating and whole-rock geochemical analysis of granitoids and felsic porphyries in the Ssangyong Valley, Yongchu Valley, and Mungyeong Saejae geosites in the Mungyeong Geopark. The igneous rocks crop out in the western, northwestern and central parts of the Mungyeong city area, respectively, and intruded (meta)sedimentary successions of the Ogcheon Metamorphic Belt, Cambro-Ordovician Mungyeong Group and Jurrasic Daedong Group. The U-Pb isotopic compositions of zircon from two felsic porphyries and one granite samples in the Ssanyeong Valley yielded the Cretaceous intrusion ages of 93.9±3.3 Ma (tσ), 95.1±4.0 Ma (tσ) and 94.4±2.0 Ma (tσ), respectively. On the other hand, a felsic dike sample and a granite in the Yongchu Valley and a porphyritic granite in the Mungyeong Saejae had intrusion ages of 90.2±2.0 Ma (tσ), 91.0±3.0 Ma (tσ) and 88.6±1.5 Ma (tσ), respectively. Based on the average standard error calculated in combination with results of previous studies in this area (Lee et al., 2010; Yi et al., 2014; Aum et al., 2019), the geochronological results show that spatial variation in intrusion age of ~5 Myr between the Ssangyong (94.5±0.2 Ma) and Yongchu Valleys (89.7±0.4 Ma) is apparent. The geochemical compositions of major and trace elements in the samples showed an affinity of typical post-orogenic granite, indicating their petrogenesis during the late stage of Early Cretaceous magmatic activity possibly in association with subduction events of the Izanagi Plate.

주제어

표/그림 (15)

그림 Fig. 1. (a) Schematic map showing various tectonic provinces and granitoids in the southern Korean Peninsula (modified from Aum et al., 2019). Abbreviations: IB, Imjingang Belt; GM, Gyeonggi Massif; OB, Ogcheon Belt; YM, Yeongnam Massif; GB, Gyeongsang Basin. (b) The geological map of the Mungyeong city area showing sample locations (modified from Kim et al., 1967; Lee and Kim, 1972; Lee and Kim, 1968; Shin and Choi, 1968; Yoo and Hong, 1973; Yun et al., 1988).
표 Table 1. U-Th-Pb isotopic compositions of zircons
표 Table 1. Continued
표 Table 1. Continued
표 Table 2. Major and trace element composition of analyzed samples from the Mungyeong area
그림 Fig. 2. Outcrop photographs of the analysed samples. (a) Granite and (b) felsic porphyry of the Ssangyong valley. (c) Yongchu valley showing granite intruded by felsic dike. (d) Biotite granite of the Mungyeong Saejae showing the memorial stone made by minister Lee, Yikjeo.
표 Table 2. Continued
그림 Fig. 3. Photomicrographs of the analysed samples. (a, b) MG1 and MG2, felsic porphyries, respectively and (c) MG3, biotite granite in the Ssangyong valley. (d) MG4, biotite granite and (e) MG5, felsic dike in the Yongchu valley. (f) MG6, biotite granite showing porphyrytic texture. (a-e) Plane and (f) cross polarized litght. Abbreviations: Bt, biotite; Chl, chlorite; fs, feldspars; G, granophyre; Kfs, K-feldspar; Pl, plagioclase; S, spherulitic texture; Qtz, quartz.
그림 Fig. 4. Cathodoluminescence images of zircons. (a) Felsic porphyries (MG1 and MG2) and biotite granite (MG3) from the Ssangyong valley. (b) Biotite granite (MG4) and felsic dike (MG5) from the Yongchu Valley. Two types of zircon grains separated from felsic dike showing dark and bright CL images. (c) Porphyritic granite from the Mungyeong Saejae (MG6). Spot numbers and apparent ²⁰⁶Pb/²³⁸U ages in Table 1 are shown in each image. Ellipses denote the analytical spots. Scale bars are 100 μm.
그림 Fig. 5. Terra-Wasserburg plots of zircon from analyzed samples. (a-c) Felsic porphyries (MG1 and MG2) and biotite granite (MG3) around the Ssangyong Valley. (d, e) Biotite granite (MG4) and felsic dike (MG5) in the Yongchu Valley. (f) Porphyritic granite (MG6) in the Mungyeong Saejae.
그림 Fig. 6. Harker diagram showing major element variations in the Mungyeong area together with previous data of the Cretaceous granitoids around the Ogcheon Belt (Lee et al., 2010; Aum et al., 2019).
그림 Fig. 7. (a) TAS diagram (Irvine and Baragar, 1971; Wilson, 1989). (b) A/NK [molar ratio Al₂O₃/(Na₂O+K2O)] vs. A/CNK [molar ratio Al₂O₃/(CaO+Na₂O+K₂O)] diagram (Maniar and Piccoli, 1989). (c) Chondrite-normalized rare earth element (REE) variation diagram (Sun and McDonough, 1989). (d) Primitive mantle-normalized spider diagram (Sun and McDonough, 1989). Grey areas in each diagram represent compilation of geochemical data from the Cretaceous granitoids around the Ogcheon Belt (Lee et al., 2010; Aum et al., 2019).
$Fig. 8. (a) R1-R2 diagram (dashed lines; Batchelor and Bowden, 1985) and rock classification diagram (solid lines; De La Roche et al., 1980). (b) SiO2 vs. FeOt/MgO diagram (after Whalen et al., 1987; Wang et al., 2004). (c) 10000xGa/Al vs. Zr plots of A-type granite (Whalen et al., 1987), (d) Zr+Nb+Ce+Y vs. (K2O+Na2O)/CaO of A-type granite (Whalen, 1987). Abbreviations: FG, fractionated felsic granite; OGT, unfractionated M-, I-, S-type granites. (e, f) Variation of Sr-Rb and Sr-Ba concentration for the Cretaceous granitoids. Mineral vectors are calculated according to partition coefficeints of biotite, K-feldspar and plagioclase from Keskin (2002). Reference data from Lee et al. (2010) and Aum et al. (2019).$ 그림 Fig. 8. (a) R1-R2 diagram (dashed lines; Batchelor and Bowden, 1985) and rock classification diagram (solid lines; De La Roche et al., 1980). (b) SiO₂ vs. FeO_t/MgO diagram (after Whalen et al., 1987; Wang et al., 2004). (c) 10000xGa/Al vs. Zr plots of A-type granite (Whalen et al., 1987), (d) Zr+Nb+Ce+Y vs. (K₂O+Na₂O)/CaO of A-type granite (Whalen, 1987). Abbreviations: FG, fractionated felsic granite; OGT, unfractionated M-, I-, S-type granites. (e, f) Variation of Sr-Rb and Sr-Ba concentration for the Cretaceous granitoids. Mineral vectors are calculated according to partition coefficeints of biotite, K-feldspar and plagioclase from Keskin (2002). Reference data from Lee et al. (2010) and Aum et al. (2019).
그림 Fig. 9. Tectonic discrimination diagrams based on (a) Rb vs. Y+Nb (b) Nb vs. Y, (c) Rb vs. Yb+Ta, and (d) Ta vs. Yb diagrams (Pearce et al., 1984; Pearce, 1996) together with compiled data of the Cretaceous granites around the Ogcheon belt (Lee et al., 2010; Aum et al., 2019).
그림 Fig. 10. Simplified geologic map (modified from Lee et al., 2010) showing distribution of the Cretaceous igneous rocks and results of age dating around the Mungyeong Geopark. The SHRIMP U-Pb zircon (white diamond symbols), and Rb-Sr whole rock (gray rectangle symbols) ages of the Cretaceous igneous rocks are illustrated together with references: (a) Lee et al. (2010); (b) this study. (c) Green lines in the error bars are approximately weighted mean ages for each group.

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저자의 다른 논문 :

표제어: PCR

동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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