Sr, Nd, Pb and Hf isotopic compositions of late Cenozoic alkali basalts in South Korea: Evidence for mixing between the two dominant asthenospheric mantle domains beneath East Asia

Choi, Sung Hi; Mukasa, Samuel B.; Kwon, SangJoo; Andronikov, A. V.

doi:10.1016/j.chemgeo.2006.02.014

Cited by 168 publications

(152 citation statements)

References 83 publications

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“…이 중, 제주도와 백령도에서의 산출빈도가 비교적 높은 편이다. 포획해 온 현무암은 알칼리현무암과 바사나이트(basanite)로서, K-Ar 전암 연대측정 자료에 의하면 분출연대는 0.1-18.9 Ma에 걸쳐있다 (신홍자 외, 2006;Arai et al, 2001;Choi et al, 2006). 포획암편의 크기는 대략 수 cm 이지만, 최대 30 cm에 달하는 경우도 있다(e.g., .…”

Section: 우리나라에서 맨틀 포획암이 산출되는 지역은 백령 도 간성일대 아산-평택지역 보은(조곡리) 및 제주도unclassified

“…7. (Hoang et al, 1996;Flower et al, 1998;Chung, 1999;Zou et al, 2003;Park et al, 2005;Choi et al, 2006). 요약하자면 부화된 맨 틀의 근원지로 암석권 맨틀(엽렬된 후 재개한 내인성 …”

Section: 첨정석 페리도타이트의 광물조합에 적용할 수 있는 지온계는 매우 다양하다 보편적으로 이용되는 것에는unclassified

“…Error bars are 2σ uncertainties, and are given only where they exceed the size of the symbol in the plot. Data sources: peridotites Kil, 2006Kil, , 2007Shin et al, 2006); host basalts (Choi et al, 2006;Kil, 2006Kil, , 2007Shin et al, 2006). Mantle components and array are from Zindler and Hart (1986) (BSE = bulk silicate Earth, DMM = depleted mantle, EM 1 and 2 = enriched mantle of type 1 and 2, respectively, HIMU = mantle with high U/Pb ratio).…”

Section: 첨정석 페리도타이트의 광물조합에 적용할 수 있는 지온계는 매우 다양하다 보편적으로 이용되는 것에는mentioning

confidence: 99%

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Lithospheric Mantle beneath the Korean Peninsula: Implications from Peridotite Xenoliths in Alkali Basalts

Choi¹

2012

The Journal of the Petrological Society of Korea

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Peridotite xenoliths hosted by alkali basalts from South Korea occur in Baengnyeong Island, Jeju Island, Boeun, Asan, Pyeongtaek and Ganseong areas. K-Ar whole-rock ages of the basaltic rocks range from 0.1 to 18.9 Ma. The peridotites are dominantly lherzolites and magnesian harzburgites, and the constituent minerals are Fo-rich olivine (Fo 88.4-92.0 ), En-rich orthopyroxene, Di-rich clinopyroxene, and Crrich spinel (Cr# = 7.8-53.6). Hydrous minerals, such as pargasite and phlogopite, or garnet have not been reported yet. The Korean peridotites are residues after variable degree of partial melting (up to 26%) and melt extraction from fertile MORB mantle. However, some samples (usually refractory harzburgites) exhibit metasomatic enrichment of the highly incompatible elements, such as LREE. Equilibration temperatures estimated using two-pyroxene geothermometry range from ca. 850 to 1050 o C. Sr and Nd isotopic compositions in clinopyroxene separates from the Korean peridotites show trends between depleted MORB-like mantle (DMM) and bulk silicate earth (BSE), which can be explained by secondary metasomatic overprinting of a precursor time-integrated depleted mantle. The Korean peridotite clinopyroxenes define mixing trends between DMM and EM2 end members on Sr-Pb and Nd-Pb isotopic correlation diagrams, without any corresponding changes in the basement. This is contrary to what we

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Section: 우리나라에서 맨틀 포획암이 산출되는 지역은 백령 도 간성일대 아산-평택지역 보은(조곡리) 및 제주도unclassified

Section: 첨정석 페리도타이트의 광물조합에 적용할 수 있는 지온계는 매우 다양하다 보편적으로 이용되는 것에는unclassified

Section: 첨정석 페리도타이트의 광물조합에 적용할 수 있는 지온계는 매우 다양하다 보편적으로 이용되는 것에는mentioning

confidence: 99%

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Lithospheric Mantle beneath the Korean Peninsula: Implications from Peridotite Xenoliths in Alkali Basalts

Choi¹

2012

The Journal of the Petrological Society of Korea

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“…Heydolph et al (2012) constitutes the appropriate crustal assimilant or source for the C-MVB rocks (Figure 12). Another strong argument against the inference of Cai et al (2014) is the present compilation for several continental rifts or extensional areas (Germany from Kolb et al, 2012;New Zealand from Timm et al, 2009; South Korea from Choi et al, 2006; the USA -Basin and Range and other basins from Beard and Johnson, 1997). The C-MVB data are indistinguishable from these extensional area or continental rift data; in fact, some of these compiled rift data plotted beyond the C-MVB data towards lower 143 Nd/ 144 Nd and 176 Hf/ 177 Hf (Figure 12).…”

Section: Reevaluation Of the Nd And Hf Isotopes From The C-mvb And Cavamentioning

confidence: 91%

Present state of knowledge and new geochemical constraints on the central part of the Mexican Volcanic Belt and comparison with the Central American Volcanic Arc in terms of near and far trench magmas

Verma¹

2015

Turkish J Earth Sci

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A brief critical review is presented of the geological, geophysical, geochemical, and plate tectonic evidence for the origin and evolution of the central part of the Mexican Volcanic Belt (C-MVB). Databases were constructed for the C-MVB from new and published data as well as for the Central American Volcanic Arc (CAVA), other continental and island arcs, continental rifts or extensional areas, and collision zones. Conventional procedures as well as statistical techniques of multidimensional tectonic discrimination diagrams and significance tests were used to interpret the data. A subdivision of the databases for the C-MVB and CAVA into near the trench or front-arc and far from the trench or backarc magmas helped to demonstrate the lack of slab input for the C-MVB and the presence of a classic arc-trench system for the CAVA. The use of software IgRoCS, DODESSYS, UDASYS, TecD, and TecDIA provided the following conclusions: 1) basic magmas in the C-MVB that originated in the mantle without the involvement of the subducted slab represent a continental rift setting; 2) C-MVB acid and intermediate magmas that originated, respectively, from the crust and mixed mantle-crustal sources do not show a clear influence of the present subducted slab and represent the tectonic setting of the older crustal and mixed mantle-crustal source rocks; and 3) all rocks in the CAVA were derived from the involvement of the subducted slab and represent a classical continental arc system related to the subduction of the Cocos plate beneath the Caribbean plate, whereas CAVA back-arc rocks originated mainly in the mantle, probably with much less involvement of the subducted slab. Reinterpretation of the Sr, Nd, Pb, and Hf isotopic data supports these inferences. I propose a new tectono-petrogenetic model based on the continuation of the extensional tectonics related to the triple rift system in the western part of the MVB.

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“…However He isotopic data showed no evidence of a high-3 He/ 4 He mantle plume involved in NE China volcanism (Chen et al, 2007). Furthermore, because of the lack of unequivocal tomographic images delineating distinct, deep-seated thermal anomalies that could be interpreted as plumes, Choi et al (2006) suggested that the late Cenozoic alkalic magmatism in East Asia originated in the shallow asthenosphere. But a few Dariganga xenoliths have high 3 He/ 4 He ratios which are similar to those found in Hawaiian hot-spot basalts; thus, Ionov and Wood (1992) suggested that the Dariganga Plateau may be an intracontinental hot-spot.…”

Section: Petrogenesis Of Late Cenozoic Abaga Basaltsmentioning

confidence: 99%

Elemental and Sr-Nd-Pb isotopic compositions of late Cenozoic Abaga basalts, Inner Mongolia: Implications for petrogenesis and mantle process

Liu

Chen

et al. 2008

Geochem. J.

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Sr, Nd, Pb and Hf isotopic compositions of late Cenozoic alkali basalts in South Korea: Evidence for mixing between the two dominant asthenospheric mantle domains beneath East Asia

Cited by 168 publications

References 83 publications

Lithospheric Mantle beneath the Korean Peninsula: Implications from Peridotite Xenoliths in Alkali Basalts

Lithospheric Mantle beneath the Korean Peninsula: Implications from Peridotite Xenoliths in Alkali Basalts

Present state of knowledge and new geochemical constraints on the central part of the Mexican Volcanic Belt and comparison with the Central American Volcanic Arc in terms of near and far trench magmas

Elemental and Sr-Nd-Pb isotopic compositions of late Cenozoic Abaga basalts, Inner Mongolia: Implications for petrogenesis and mantle process

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