Silica enrichment of Group II xenoliths by evolved alkali basalt from Jeju Island, South Korea: implication for modification of intraplate deep-seated rocks

Yang, Kyounghoon; Szabó, Csaba; Arai, Shoji; Yu, Jianxin; Jung, Hoonyeong

doi:10.1007/s00710-012-0222-x

Cited by 9 publications

(4 citation statements)

References 49 publications

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“…Such magma emplacement and movement are controlled by various factors, including local or regional stress fields and preexisting structural (e.g., fault or fracture) or rheological discontinuities (Maccaferri et al, 2010;Martí et al, 2016;Takada, 1989;Valentine & Perry, 2007). A previous petrological study on JI revealed that peridotite xenoliths metasomatized by evolved alkali basalt (Yang et al, 2012), which could promote the intensive interaction between the host magma and the lithospheric environment.…”

Section: Journal Of Geophysical Research: Solid Earthmentioning

confidence: 99%

Imaging of Lithospheric Structure Beneath Jeju Volcanic Island by Teleseismic Traveltime Tomography

et al. 2018

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Jeju Island (JI) is an intraplate volcanic field located at the continental margin of Northeast Asia. This volcanic island has been formed by multiple eruptions from the Pleistocene to the Holocene (~3.7 ka), which have yielded hundreds of monogenetic volcanic cones and a central basaltic shield. To understand the volcanic structures and mechanism beneath JI, we deployed 20 broadband temporary seismometers across the island for over two years (October 2013 to November 2015). We investigated the crustal and upper mantle structures in JI for the first time using the gathered data. Through teleseismic traveltime tomography, we obtained images of the lithospheric structure related to the volcanic system. A major finding was the identification of a prominent low‐velocity anomaly (<−0.3 km/s in P wave velocity relative to the surrounding high‐velocity region) beneath the summit of the central shield volcano at greater depths (50–60 km), which separates into low‐velocity zones at shallower depths (10–45 km). Based on previous geological observations, the anomalies were interpreted as a magmatic system, potentially with partial melting. Moreover, relatively high velocity zones were consistently imaged to the north, east, and west of the island, indicating relatively thick lithospheric structures at the southern margin of the continental lithosphere beneath the Korean Peninsula. Based on the geometries of the imaged structures, we suggest that a focused decompressional melting at sublithospheric depths and complex magma interactions within the lithosphere resulted in the characteristics of JI volcanism as intraplate magmatic activities that are isolated in space and confined in time.

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Section: Journal Of Geophysical Research: Solid Earthmentioning

confidence: 99%

Imaging of Lithospheric Structure Beneath Jeju Volcanic Island by Teleseismic Traveltime Tomography

et al. 2018

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“…Group 1 xenoliths are spinel lherzolite and spinel harzburgite, containing Crrich clinopyroxene. Group 2 xenoliths are dunite, wehrlite to olivine clinopyroxenite, and olivine websterite to websterite, having Al-Ti-rich clinopyroxene (Choi et al, 2005;Woo et al, 2014;Yang et al, 2012b). In this study, all xenolith samples are protogranular spinel lherzolites composed of olivine, orthopyroxene (enstatite), and clinopyroxene (diopside).…”

Section: Samples and Analytical Methodsmentioning

confidence: 75%

Helium isotopes and olivine geochemistry of basalts and mantle xenoliths in Jeju Island, South Korea: Evaluation of role of SCLM on the Cenozoic intraplate volcanism in East Asia

Kim

Lee

et al. 2021

Lithos

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“…그러나 최근 연구는 섭입대 환경이 아닌 판내부환 경에서도 실리카부화 교대작용이 일어나고 있으며, 교 대대행자는 실리카에 불포화된 알칼리 마그마가 분별 결정작용에 의해 실리카에 포화된 잔류멜트로 진화된 유체로 정의하고 있다 (Arai et al, 2006;Yang et al, 2012b). 모호면에 언더플레이트(underplate)된 큐 뮬레이트(cumulate)로 해석되는 제주도 II형의 초염기 성 포획암 (Fig.…”

Section: 현재 섭입환경과 전혀 상관없어 보이는 미국의unclassified

Composition and Evolution of Lithosphere Beneath the Jeju Island Region (I): A Review

Yang¹

2016

The Journal of the Petrological Society of Korea

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Our knowledge of the lithosphere beneath the Korean Peninsula has been improved through petrologic and geochemical studies of upper mantle xenoliths hosted by Quaternary intraplate alkali basalts from Jeju Island. The xenoliths are mostly spinel lherzolites, accompanied by subordinate harzburgite and pyroxenites. The mantle xenoliths represent residual mantle material showing textural and geochemical evidence for at least a three-stage evolution, fractional partial melting, recrystallization, and metasomatism. Their composition primarily controlled by early fractional melt extraction and porphyroclastic and mylonitic fabrics formed in a shear-dominated environment, which was subsequently modified by residual slab-derived fluids (or melts). Modal metasomatic products occur as both anhydrous phase(orthopyroxene) and hydrous phase (phlogopite). Late-stage orthopyroxene is more common than phlogopite. However, chemical equilibrium is evident between the primary and secondary orthopyroxene, implying that the duration of post-metasomatic high temperatures enabled complete resetting/reequilibration of the mineral compositions. The metasomatic enrichment pre-dates the host Jeju Quaternary magmatism, and a genetic relationship with the host magmas is considered unlikely. Following enrichment in the peridotite protolith in the mantle wedge, the upper mantle beneath proto-Jeju Island was transformed from a subarc

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Silica enrichment of Group II xenoliths by evolved alkali basalt from Jeju Island, South Korea: implication for modification of intraplate deep-seated rocks

Cited by 9 publications

References 49 publications

Imaging of Lithospheric Structure Beneath Jeju Volcanic Island by Teleseismic Traveltime Tomography

Imaging of Lithospheric Structure Beneath Jeju Volcanic Island by Teleseismic Traveltime Tomography

Helium isotopes and olivine geochemistry of basalts and mantle xenoliths in Jeju Island, South Korea: Evaluation of role of SCLM on the Cenozoic intraplate volcanism in East Asia

Composition and Evolution of Lithosphere Beneath the Jeju Island Region (I): A Review

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