Micropaleontological and seismic observations for early developmental stage of the southwestern Ulleung Basin, East Sea (Japan Sea)

Yun, Hyo-In; Yi, Songsuk; Oh, Jin Kyung; Byun, Hyunsook; Shin, Kooksun

doi:10.1111/j.1440-1738.2007.00571.x

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…Location of the Japanese arc next to the Korean peninsula and the Russian Far East prior to Miocene opening of the Japan Sea by back‐arc spreading is indicated by faint dots (Otofuji et al. 1991; Yun et al. 2007).…”

Section: Plate‐tectonic Sketches Of Study Areasmentioning

confidence: 99%

Late Mesozoic subduction‐induced hydrothermal gold deposits along the eastern Asian and northern Californian margins: Oceanic versus continental lithospheric underflow

Ernst

2010

Island Arc

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During late Mesozoic subduction of paleo-Pacific lithospheric plates, numerous gold vein deposits formed in the Dabie-Sulu Belt of east-central China plus its east-Asian extensions, and in the Klamath Mountains plus Sierran Foothills of northern California. In eastern Asia, earlier transpression and continental collision at about 305-210 Ma generated a high pressure-ultrahigh pressure orogen, but failed to produce widespread intermediate to felsic magmatism or abundant hydrothermal gold deposits. Similarly in northern California, strike-slip Ϯ minor transtension-transpression over the interval of about 380-160 Ma resulted in the episodic stranding of oceanic terranes, but generated few granitoid magmas or Au ore bodies. However, for both continental margin realms, nearly head-on Cretaceous destruction of oceanic lithosphere involved sustained underflow; reaching magmagenic depths of about 100 km, the descending mafic-ultramafic plates dewatered, producing voluminous calc-alkaline arc magmas. Ascent of these plutons into the middle and upper crust released CO 2 Ϯ S-bearing aqueous fluids and/or devolatilized the contact-metamorphosed wall rocks. Such hydrothermal fluids transported gold along fractures and fault zones, precipitating it locally in response to cooling, fluid mixing, and/or reactions with wall rocks of contrasting compositions (e.g. serpentinite, marble). In contrast, where sialic crust was subducted to depths of about 100 km, only minor production of granitoid melts occurred, and few major coeval Au vein deposits formed. The mobilization of precious metal-bearing fluids in continental margin and island arc environments apparently requires long-continued, nearly orthogonal descent of oceanic, not continental, lithosphere.

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Section: Plate‐tectonic Sketches Of Study Areasmentioning

confidence: 99%

Late Mesozoic subduction‐induced hydrothermal gold deposits along the eastern Asian and northern Californian margins: Oceanic versus continental lithospheric underflow

Ernst

2010

Island Arc

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“…The opening of the East Sea is generally thought to have begun during the late Oligocene or early Miocene, continuing until ~ 15-12 Ma. The Ulleung Basin formed during the final stage of the opening of the East Sea 27,[33][34][35] .…”

mentioning

confidence: 99%

Gravity and magnetic anomalies of earthquake-prone areas in the southwestern Ulleung basin margin, East Sea (Sea of Japan)

Kim

Choi

et al. 2022

Sci Rep

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Submarine earthquakes have increased in the southwestern Ulleung Basin adjacent to the Korean Peninsula. This study analyzed the gravitational and magnetic properties of the three earthquake-prone areas (Hupo Bank and offshore regions near Pohang and Ulsan) in the basin. The basin was affected by tensile and compressive stresses during the formation of the East Sea. The southern Hupo Bank and the Pohang offshore exhibited high gravity anomalies and strong magnetic anomalies. Hupo Bank was separated from the peninsula and earthquakes in this region have been influenced by crustal fractures that facilitated igneous activities during the formation of the basin. Dense volcanic rocks and seaward dipping reflectors along the Pohang coast and continental slope suggest magmatic activities during the formation of the East Sea. Comparatively, the Ulsan offshore, with a thick sedimentary layer, exhibited a slightly higher gravity anomaly than the surrounding area, but no significant differences in the magnetic anomaly. Sequential tensile and compressive stresses related to the creation of the basin produced complex tectonic structures in this region. The magnetic tilt derivative results suggest that earthquakes were located near magnetic source boundaries. The results show that it is important to monitor earthquake-prone areas with gravity and magnetic anomalies.

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Evolution of the Dok Do seamounts, Ulleung Basin, East Sea: constraints based on the reconstruction of virtual geomagnetic poles using paleomagnetic data

et al. 2008

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Micropaleontological and seismic observations for early developmental stage of the southwestern Ulleung Basin, East Sea (Japan Sea)

Cited by 7 publications

References 35 publications

Late Mesozoic subduction‐induced hydrothermal gold deposits along the eastern Asian and northern Californian margins: Oceanic versus continental lithospheric underflow

Late Mesozoic subduction‐induced hydrothermal gold deposits along the eastern Asian and northern Californian margins: Oceanic versus continental lithospheric underflow

Gravity and magnetic anomalies of earthquake-prone areas in the southwestern Ulleung basin margin, East Sea (Sea of Japan)

Evolution of the Dok Do seamounts, Ulleung Basin, East Sea: constraints based on the reconstruction of virtual geomagnetic poles using paleomagnetic data

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