Hui Je Jo

Korea Institute of Geoscience and Mineral Resources

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Youn‐Joong Jeong

Korea Basic Science Institute

Albert Chang-sik Cheong

Korea Basic Science Institute

Keewook Yi

Korea Basic Science Institute

Xian‐Hua Li

Chinese Academy of Sciences

Chang‐Sik Cheong

Korea Basic Science Institute

Shinae Lee

Korea Basic Science Institute

Namhoon Kim

Kangwon National University

Kye‐Hun Park

Pukyong National University

Moonsup Cho

Seoul National University

Hanna Choi

Korea Institute of Geoscience and Mineral Resources

Cooperative Institutions

Korea Basic Science Institute

Korea Institute of Geoscience and Mineral Resources

Chungnam National University

Seoul National University

Korea University of Science and Technology

Pukyong National University

Pusan National University

Yonsei University

Rural Development Administration

Gyeongsang National University

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Geochemical and Sr–Nd isotopic constraints on the petrogenesis of the Goesan monzodiorite pluton in the central Okcheon belt, Korea

Island Arc (2016)

Chang‐Sik Cheong Hui Je Jo Youn‐Joong Jeong Chansoo Park Moonsup Cho

Abstract The Permian–Triassic high pressure metamorphism and potassic magmatism in central Korea attest to the extension of the Dabie‐Sulu collision belt in central‐eastern China towards the Korean Peninsula and possibly the Japanese Islands. We present major and trace element and Sr–Nd isotope data for a ca. 230 Ma monzodiorite pluton emplaced in the Goesan area, central Okcheon belt, Korea. This pluton shows geochemical features comparable with those of the coeval monzonite–syenite–gabbro–mangerite suite documented recently in the Gyeonggi massif. The metaluminous and alkali–calcic signatures of the Goesan intrusives correspond to the Caledonian‐type post‐orogenic granitoids. The K 2 O/Na 2 O ratios of all analyzed samples are greater than 1, and are not correlative with their SiO 2 contents. The enrichment of both large‐ion‐lithophile elements and highly compatible elements in the Goesan pluton is probably indicative of metasomatized mantle origin. The elemental fractionation in the source region must have occurred in the distant past, possibly the Paleoproterozoic, to generate significantly negative ε Nd (t) values (< –16). Chondrite‐normalized rare earth element patterns as well as Rb/Sr and Ba/Rb ranges suggest that the source consists of amphibole‐bearing rocks. Progressive decreases in negative Eu anomaly and Ba, Sr, Ni, Cr and V contents with increasing SiO 2 contents reflect an important role of plagioclase, biotite and hornblende for the fractionation process. Zr is undersaturated in the potassic, metaluminous melt. The initial Sr–Nd isotopic compositions of the samples are correlated with their SiO 2 contents, substantiating a role of crustal assimilation during the magmatic differentiation. The Sr–Nd elemental and isotopic modeling suggests that the Goesan pluton was initially slightly heterogeneous in its isotopic composition, and underwent concurrent assimilation and fractional crystallization. The occurrence of the Goesan pluton provides further evidence corroborating the amalgamation of allochthonous terranes within the Okcheon belt during the Permian–Triassic collisional orogeny.

Petrogenesis

Quartz monzonite

Hornblende

10.1111/iar.12134

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Citations (9)

Juxtaposition of allochthonous terranes in the central Korean Peninsula: Evidence from zircon U-Pb ages and O-Hf isotopes in Jurassic granitoids

Chemical Geology (2017)

Hui Je Jo Albert Chang-sik Cheong Keewook Yi Xian‐Hua Li

Massif

Orogeny

Protolith

Continental arc

10.1016/j.chemgeo.2017.10.006

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Citations (26)

Lithospheric mantle signatures as revealed by zircon Hf isotopes of Late Triassic post‐collisional plutons from the central Korean peninsula, and their tectonic implications

Terra Nova (2014)

Chang‐Sik Cheong Namhoon Kim Hui Je Jo Moonsup Cho Sung Hi Choi

Abstract The Mesozoic tectonic architecture of the Korean peninsula is largely governed by the continental collision between the North and South China blocks. Zircon Hf isotopic compositions presented in this study and whole‐rock geochemical and Sr‐Nd isotope data in the literature collectively suggest that the lithophile‐elements‐enriched signature of the Late Triassic post‐collisional plutons from the Gyeonggi massif in central Korea is a primary feature inherited from the metasomatized mantle lithosphere. Highly negative zircon ε Hf ( t ) values (−23 to −19) of plutons from the middle and eastern parts of the massif indicate an ancient metasomatism of their mantle source. Distinctly higher zircon ε Hf ( t ) values (−15 to −12) from the southwestern plutons are ascribed to a contribution from an accreted component of the South China‐like block. The involvement of asthenospheric mantle is not recognized in zircons from either group. The implications of these isotopic features are discussed in the context of Mesozoic collisional tectonics.

Massif

continental collision

10.1111/ter.12135

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Citations (29)

Lithospheric thinning and ignition of a Cordilleran magmatic flare-up: Geochemical and O-Hf isotopic constraints from Cretaceous plutons in southern Korea

Geoscience Frontiers (2022)

Albert Chang-sik Cheong Minji Jung Hui Je Jo Jeongmin Kim Shinae Lee

Northeast Asian continental margins contain the products of magma emplacement driven by prolonged subduction of the (paleo-)Pacific plate. As observed in many Cordilleran arcs, magmatic evolution in this area was punctuated by high-volume pulses amid background periods. The present study investigates the early evolution of the Cretaceous magmatic flare-up using new and published geochronological, geochemical, and O-Hf isotope data from plutonic rocks in the southern Korean Peninsula. After a long (∼50 m.y.) magmatic hiatus and the development of the Honam Shear Zone through flat-slab subduction, the Cretaceous flare-up began with the intrusion of monzonites, granodiorites, and granites in the inboard Gyeonggi Massif and the intervening Okcheon Belt. Compared to Jurassic granitoids formed during the former flare-up, Albian (∼111 Ma) monzonites found in the Eopyeong area of the Okcheon Belt have distinctly higher zircon εHf(t) (−7.5 ± 1.3) and δ18O (7.78‰ ± 0.25‰) values and lower whole-rock La/Yb and Sr/Y ratios. The voluminous coeval granodiorite and granite plutons in the Gyeonggi Massif are further reduced in Sr/Y and to a lesser extent, in La/Yb, and have higher zircon εHf(t) values (−13 to −19) than the Precambrian basement (ca. −30). These chemical and isotopic features indicate that Early Cretaceous lithospheric thinning, most likely resulting from delamination of tectonically and magmatically overthickened lithospheric keel that was metasomatized during prior subduction episodes, and consequent asthenospheric upwelling played vital roles in igniting the magmatic flare-up. The O-Hf isotopic ranges of synmagmatic zircons from the Albian plutons and their Paleoproterozoic and Jurassic inheritance attest to the involvement of lithospheric mantle and crustal basement in magma generation during this decratonization event. Arc magmatism then migrated trenchward and culminated in the Late Cretaceous, yielding widespread granitoid rocks emplaced at shallow crustal levels. The early Late Cretaceous (94–85 Ma) granites now prevalent in Seoraksan-Woraksan-Sokrisan National Parks are highly silicic and display flat chondrite-normalized rare earth element patterns with deep Eu anomalies. Synmagmatic zircons in these granites mimic their host rock's chemistry. Delamination-related rejuvenation of crustal protoliths is indicated by zircon εHf(t) values of granites (−6 to −20) that are consistently higher than the Precambrian basement value. Concomitant core-to-rim variation in zircon O-Hf isotopic compositions reflects a typical sequence of crustal assimilation and fresh input into the magma chamber.

Massif

10.1016/j.gsf.2022.101492

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Determination of Sr–Nd–Pb Isotopic Ratios of Rock Reference Materials Using Column Separation Techniques and TIMS

Separations (2021)

Hui Je Jo Hyo Min Lee Go‐Eun Kim Won Myung Choi Tae-Hoon Kim

Thermal ionization mass spectrometry (TIMS) can provide highly accurate strontium (Sr), neodymium (Nd), and lead (Pb) isotope measurements for geological and environmental samples. Traces of these isotopes are useful for understanding crustal reworking and growth. In this study, we conducted a sequential separation of Sr, Nd, and Pb and subsequently measured the 87Sr/86Sr, 143Nd/144Nd, 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios of 13 widely used rock certified reference materials (CRMs), namely BCR-2, BHVO-2, GSP-2, JG-1a, HISS-1, JLk-1, JSd-1, JSd-2, JSd-3, LKSD-1, MAG-1, SGR-1, and 4353A, using TIMS. In particular, we reported the first isotopic ratios of Sr, Nd, and Pb in 4353A, Sr and Nd in HISS-1 and SGR-1, and Sr in JLk-1, JSd-2, JSd-3, and LKSD-1. The Sr–Nd–Pb isotopic compositions of most in-house CRMs were indistinguishable from previously reported values, although the Sr and Pb isotopic ratios of GSP-2, JSd-2, JSd-3, and LKSD-1 obtained in different aliquots and/or batches varied slightly. Hence, these rock reference materials can be used for monitoring the sample accuracy and assessing the quality of Sr–Nd–Pb isotope analyses.

Radiogenic nuclide

Certified reference materials

Isotopes of strontium

10.3390/separations8110213

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Citations (13)

Tectonomagmatic evolution of a Jurassic Cordilleran flare-up along the Korean Peninsula: Geochronological and geochemical constraints from granitoid rocks

Gondwana Research (2020)

Albert Chang-sik Cheong Hui Je Jo

Massif

Batholith

10.1016/j.gr.2020.06.025

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Citations (32)

LKZ-1: A New Zircon Working Standard for the In Situ Determination of U–Pb Age, O–Hf Isotopes, and Trace Element Composition

Minerals (2019)

Albert Chang-sik Cheong Youn‐Joong Jeong Shinae Lee Keewook Yi Hui Je Jo

This study introduces a new zircon reference material, LKZ-1, for the in situ U–Pb dating and O–Hf isotopic and trace element analyses. The secondary ion mass spectrometric analyses for this gem-quality single-crystal zircon yielded a weighted mean 206Pb/238U age of 572.6 ± 2.0 Ma (2σ, n = 22, MSWD = 0.90), with moderately high U concentrations (619 ± 21 ppm, 1 SD), restricted Th/U ratios (0.146 ± 0.002, 1 SD), and negligible common Pb content (206Pbc < 0.2%). A comparable 206Pb/238U age (570.0 ± 2.5 Ma, 2σ) was produced by the isotope dilution-thermal ionization mass spectrometry. The secondary ion mass spectrometric and laser ablation-assisted multiple collector inductively coupled plasma mass spectrometer analyses respectively showed that LKZ-1 had little variation in O (δ18OV-SMOW = 10.65 ± 0.14‰; laser fluorination value = 10.72 ± 0.02‰; 1 SD) and Hf (176Hf/177Hf = 0.281794 ± 0.000016, 1 SD) isotopic compositions. LKZ-1 was also fairly homogeneous in its chemical composition (RSD of laser ablation ICPMS data ≤ 10%), displaying a relatively uniform chondrite-normalized rare earth element pattern ((Lu/Gd)N = 31 ± 3, Eu/Eu* = 0.43 ± 0.17, Ce/Ce* = 44 ± 32; 1 SD). These consistencies suggest that the LKZ-1 zircon is a suitable working standard for geochronological and geochemical analyses.

Isotope dilution

Trace element

Laser Ablation

Rare-earth element

10.3390/min9050325

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Citations (16)

In-situoxygen isotope records of crustal self-cannibalization selectively captured by zircon crystals from high-δ²⁶Mg granitoids

Geology (2016)

Hui Je Jo Albert Chang-sik Cheong Jong‐Sik Ryu Namhoon Kim Keewook Yi

Zircon oxygen-hafnium and biotite magnesium isotopic compositions of Late Cretaceous to Oligocene (88–27 Ma) granitoids from the Gyeongsang continental arc, southeastern Korea, collectively provide a new insight into shallow magma petrogenesis. Zircon crystals extracted from eight calc-alkaline or alkaline plutons commonly contain xenocrystic cores and typically show magmatic cathodoluminescence zonings and sharp Raman spectra. Most zircons have positive eHf values plotting below the mid-ocean-ridge basalt evolution path, indicating that the arc magmatism was dominated by the recycling of juvenile materials. Zircon δ18O values shifted upward or downward from the mantle range attest to the O isotopic exchange of protoliths with surface waters at various temperature conditions. Small (<1‰) but discernable core-to-rim decreases of δ18O values are recognized selectively in magmatic zircon grains from four plutons possessing biotite δ26Mg values (–0.07‰ to +2.32‰) distinctly higher than the mantle range. Such a concomitant O-Mg isotopic variation provides compelling evidence for a series of self-induced hydrothermal alteration and assimilation processes (i.e., crustal self-cannibalization). This study shows that the supracrustal input to magmas in a young and juvenile orogen can be traced effectively by the combination of stable isotope records from the plutonic root.

Cannibalization

10.1130/g37725.1

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Citations (20)

SHRIMP U-Pb Ages of the Namwon and Sunchang Granites

The Journal of the Petrological Society of Korea (2013)

Hui Je Jo Kye‐Hun Park Keewook Yi

남원화강암과 순창화강암은 한반도의 남서부에서 각각 영남육괴와 옥천변성대를 관입하고 있는 인접암체이다. 이 연구에서는 가장 신뢰도가 높은 연령 분석방법으로 평가되는 SHRIMP를 이용하여 남원화강암과 순창화강암체의 저어콘 U-Pb 연대측정을 실시하였다. 그 결과 남원화강암체로부터 $185.8{\pm}0.9(2{\sigma})$ Ma의 정치연령을 구하였다. 한편 순창화강암체의 북부지역으로부터는 $175.0{\pm}2.0(2{\sigma})$ Ma, 그리고 중부지역으로부터는 $179.8{\pm}0.9(2{\sigma})$ Ma의 연령을 구하였으며, 순창화강암체의 분석자료 전체로부터는 $177.4{\pm}1.3(2{\sigma})$ Ma의 평균연령이 계산되었다. 이러한 결과는 순창화강암에 현저한 변형을 초래한 호남전단대의 활동이 약 175Ma 이후에도 일어났음을 확인해준다. The Namwon and Sunchang granites are neighbouring plutons intruding the Yeongnam massif and the Okcheon metamorphic belt, respectively in the southwestern part of the Korean peninsula. In this study, SHRIMP zircon U-Pb ages are determined from these plutons. The results show that the emplacement age of the Namwon granite is $185.8{\pm}0.9(2{\sigma})$ Ma. We obtained $175.0{\pm}2.0(2{\sigma})$ Ma from the northern part and $179.8{\pm}0.9(2{\sigma})$ Ma from the central part of the Sunchang granite, yielding $177.4{\pm}1.3(2{\sigma})$ Ma as the average age of the pluton. Such age results confirm that the Honam shear zone, which cause marked deformation of the Sunchang granite, was active after ca. 175 Ma.

Massif

Sigma

10.7854/jpsk.2013.22.2.197

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Citations (5)

Recurrent Quaternary magma generation at Baekdusan (Changbaishan) volcano: New zircon U-Th ages and Hf isotopic constraints from the Millennium Eruption

Gondwana Research (2018)

Albert Chang-sik Cheong Youn‐Joong Jeong Hui Je Jo Young Kwan Sohn

Magma chamber

Caldera

10.1016/j.gr.2018.11.006

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Citations (14)