Geochemistry and zircon U-Pb-Hf isotopes of igneous rocks associated with the Dongnam Fe-Mo skarn deposit, Taebaeksan Basin, South Korea

Oh, Il‐Hwan; Koh, Sang‐Mo; Heo, Chul‐Ho; Lee, Bum Han; Seo, Jung-Kil; No, Sang-Gun; Cho, Seong‐Jun; Yoo, Bong Chul

doi:10.1007/s12303-022-0014-1

Cited by 1 publication

(12 citation statements)

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“…Previous studies on emplacement ages were conducted using the K–Ar dating method only in and around some deposits, except for the Dongnam and Wondong areas (DN‐1, DN‐2, WD‐1). Oh et al (2022) obtained a U–Pb age of 113.73 ± 0.21 Ma from quartz monzodiorite, 109.36 ± 0.36 Ma from granodiorite, and 80.33 ± 0.16 Ma from granite in the Dongnam area using LA‐MC‐ICP‐MS. Park et al (2013) obtained a U–Pb age of 79.37 ± 0.94 Ma from granite in the Wondong area using SHRIMP.…”

Section: Discussionmentioning

confidence: 99%

“…The Dongnam area consists of the Cambrian‐Ordovician Myobong slate Formation, Pungchon Formation, and Hwajeol Formation, as well as igneous rocks that intruded at a late stage. The igneous rock consists of quartz monzodiorite (DN‐1), granite (DN‐2), granodiorite, and dikes (Oh et al, 2022). Quartz monzodiorite (DN‐1) intrudes into the Pungchon Formation and Myobong slate Formation and is lenticular‐shaped.…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…Granite (DN‐2) intruded into the Pungchon Formation and quartz monzodiorite (DN‐1). Granite (DN‐2), suggested to be a Fe skarn‐related igneous rock, formed Fe–(Mo) skarn deposits (Oh et al, 2022). This igneous rock is exposed at the surface for about 0.2 km 2 and is lenticular‐ or vein‐shaped.…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…Nine fresh rock samples were collected for whole-rock major and trace element (including rare-earth elements) analyses (Table 2). Samples of Dongnam (DN-1, DN-2) referred to the previous analysis results (Oh et al, 2022). Major element compositions were determined using an x-ray fluorescence spectrometer (XRF) at the Activation Laboratories Ltd., Canada, and the Korea Institute of Geoscience and Mineral Resources (KIGAM), South Korea.…”

Section: Whole-rock Geochemistrymentioning

confidence: 99%

“…The Choseon supergroup comprises nine formations: the at a late stage. The igneous rock consists of quartz monzodiorite (DN-1), granite (DN-2), granodiorite, and dikes (Oh et al, 2022). Quartz monzodiorite (DN-1) intrudes into the Pungchon Formation and Myobong slate Formation and is lenticular-shaped.…”

Section: Regional Geologymentioning

confidence: 99%

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Geochronology, magma source, and geochemistry of igneous rocks in the northern Taebaeksan metallogenic region, South Korea

Heo

et al. 2023

Resource Geology

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Cretaceous igneous rocks are concentrated in the northern Taebaeksan metallogenic region of South Korea, some of which are related to Fe skarns and/or hydrothermal vein Au–Ag deposits. However, detailed studies on the emplacement age and magma source of igneous rocks supplying this metallogenic area are lacking. In this study, we investigated the emplacement age, magma sources, and geochemical characteristics of seven Cretaceous igneous rocks around the ore deposit, comparing them with previous studies. Zircon U–Pb and mica K–Ar age dating indicated that two magmatism events occurred in the Early Cretaceous (~113.7 ± 0.2 to 104.7 ± 0.5 Ma) and the Late Cretaceous (~85.8 ± 1.1 to 77.6 ± 0.4 Ma). Negative ɛHf(t) values (−2.57 to −22.05 approx.) and the calculated (2.55–1.33 Ga) suggested that the magma source of these igneous rocks was derived from the Proterozoic crust. Whole‐rock geochemical data indicated that the northern Taebaeksan igneous rocks are mostly high‐K calc‐alkaline series, enriched in light rare‐earth elements (LREEs) and large‐ion lithophilic (LIL) elements but depleted in high‐field‐strength (HFS) elements. Although igneous rocks in the northern Taebaeksan metallogenic region have broadly similar magma source characteristics, they can be classified into two groups: one comprises Early Cretaceous intermediate rocks, some of which are related to Au–Ag mineralization, whereas the other includes Late Cretaceous intermediate to felsic rocks, related to Au–Ag or Fe mineralization.

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Section: Discussionmentioning

confidence: 99%

Section: Geologic Backgroundmentioning

confidence: 99%

Section: Geologic Backgroundmentioning

confidence: 99%

Section: Whole-rock Geochemistrymentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

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