Assimilation of lower to middle crust by high alumina basalt magma as an explanation for the origin of medium-K volcanic rocks in southern Kyushu, Japan

Hosono, Takahiro; Nakano, Takanori; Shin, Ki-Cheol; Murakami, Hiroyasu

doi:10.1016/j.lithos.2008.02.007

Cited by 8 publications

(16 citation statements)

References 52 publications

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“…Accordingly, this enriched component and crustal assimilation revealed by the geochemical characteristics of S9 pumice may most likely indicate the contribution of the lower crust, which has higher 87 Sr/ 86 Sr and much lower 143 Nd/ 144 Nd ratios than S9 pumice. Some lower crustal xenoliths from North China and lower crustal granodiorite from southern Kyushu generally yield higher 87 Sr/ 86 Sr ratios and much lower 143 Nd/ 144 Nd ratios than S9 pumice [75][76][77][78]. Letouzey and Kimura [72] suggested that the middle and northern parts of the OT were an uplifted land area constructed from Cretaceous granite and older host rocks before the late Miocene.…”

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

“…Kizaki [28] suggested that the geological characteristics beneath the central grabens of the OT are similar to that of the Inner Zone of southwest Japan, which is featured by abundant exposures of Cretaceous to Paleogene felsic volcanic and plutonic rocks. The Sr-Nd isotope compositions of granites from the Kyushu Island display the signature of the lower crust [77,78], which can be used as representative of the lower crustal endmember.…”

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

“…b The composition of UCC is cited from Meng et al [81], Zhang et al [82], and Wedepohl [83]. c LC = lower crust, Sr-Nd isotope data are from references [77,78]. Pb isotope composition is from references [77,78,84].…”

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

“…c LC = lower crust, Sr-Nd isotope data are from references [77,78]. Pb isotope composition is from references [77,78,84]. d Philippine Sea sediment (PSs) is a composition of sediment at DSDP Sites 442/443/444.…”

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

“…To constrain the magmatic compositions of S9 pumice samples in this study, 87 Sr/ 86 Sr, 143 Nd/ 144 Nd, and 206 Pb/ 204 Pb of the pumices, as well as potential sources, the Indian Ocean MORB-type mantle, the Philippine Sea sediments, lower crustal component, and UCC, together with previously reported volcanic rocks from the MOT were plotted against each other (Figures 9 and 10). S9 pumice samples mainly fall along the mixing line between the Indian Ocean MORB-type mantle and the Philippine Sea sediments, and tend to have a trend towards the mixing line between the Indian Ocean MORB-type mantle and lower crustal component [77,78,84], but far away from the mixing line between the Indian Ocean MORB-type mantle and the UCC (Figure 9). These results suggest that the magmatic composition of S9 pumice is a two-endmembers mixture of the Indian Ocean MORB-type mantle and the Philippine Sea sediments.…”

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

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Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes

Fang

Zeng

et al. 2019

JMSE

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Frequent volcanic activity has occurred in the Okinawa Trough (OT) during the late Quaternary, which attracted much attention to the origin of volcanic rocks. Pumice collected from the seafloor has been extensively investigated, whereas few studies paid attention to the pumice in the sediment. The geochemical compositions of pumice preserved in sediments generally provide insight into past volcanic activity and regional magmatism. Here, we present major and trace element compositions and Sr-Nd-Pb isotope data, together with the established age framework for pumice samples recovered from sediment core S9 in the middle OT (MOT) to investigate their possible formation. Compositionally, the S9 pumice samples are dacite and are characterized by relatively higher Sr (87Sr/86Sr = 0.70480–0.70502) and Pb (206Pb/204Pb = 18.321-18.436, 207Pb/204Pb = 15.622–15.624, and 208Pb/204Pb = 38.52–38.63) and lower Nd (143Nd/144Nd = 0.51272–0.51274) isotope compositions than basalts from the MOT. The geochemical compositions of pumice clasts from different layers of core S9 display no temporal variation trends and vary within narrow ranges. On the basis of the geochemical characteristics of S9 pumice samples, we infer that the parent magma of these samples might generate from hybrid magma through an extensive fractional crystallization process. The Indian Ocean MORB-type mantle was first metasomatized by the subducted Philippine Sea sediments to form the primitive magma; then, followed by assimilation of a small amount of lower crustal component occurred in the lower crust. The long-term magmatism and relatively consistent isotopic compositions indicate that a magma chamber might have existed in the lower crust of the MOT between 11.22 and 12.96 cal. ka BP.

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Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

Section: Magma Sources Of S9 Pumicementioning

confidence: 99%

See 3 more Smart Citations

Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes

Fang

Zeng

et al. 2019

JMSE

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Research and Application of Mineral Prediction Method Based on Cluster Analysis and Factor Analysis—Taking the Gold and Copper Deposits in the East of Yanbian as an Example

2021

Lecture Notes in Electrical Engineering

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Using high-resolution Pb isotopes to unravel the petrogenesis of Sakurajima volcano, Japan

2020

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Sakurajima volcano on the rim of Aira caldera erupts daily, threatening the major nearby population centre of Kagoshima. Before 1955, eruptions have typically consisted of intermittent Plinian and effusive activity, but since 1955, frequent Vulcanian explosions have occurred, indicating a change in pre-eruptive processes. High-resolution Pb isotopes are used here to constrain the components, including crustal assimilants, and petrogenetic processes contributing to the composition of both pre and post 1955 magmas. Sakurajima eruptive products have more radiogenic Pb (206 Pb/ 204 Pb = 18.40-18.42) than nearby Sumiyoshiike basalts (206 Pb/ 204 Pb = 18.24), a proxy for the primitive magma feeding the Sakurajima-Aira system. Sakurajima samples lie along a mixing line between these basalts and locally exposed crustal compositions. Their Pb isotopes are consistent with addition of~5% average crustal melt to the primitive basaltic magma. The narrow range of Pb isotope ratios, despite variable SiO 2 contents (56.6-72.3 wt%), suggests that the final erupted magmas are derived from fractional crystallization of a mafic precursory magma displaying relatively consistent levels of crustal contamination. Andesites erupted between 4-3.7 ka and the 1995 eruption are contaminated to a greater extent, indicating that magmas with distinct compositions can feed phases of activity or individual eruptions. Post 1955 andesitic pyroclastics have lower SiO 2 and higher MgO than older lavas, yet equivalent Pb isotope ratios. The more mafic composition of post 1955 eruptive products can be attributed to increased throughput of mafic magma to the system.

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Assimilation of lower to middle crust by high alumina basalt magma as an explanation for the origin of medium-K volcanic rocks in southern Kyushu, Japan

Cited by 8 publications

References 52 publications

Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes

Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes

Research and Application of Mineral Prediction Method Based on Cluster Analysis and Factor Analysis—Taking the Gold and Copper Deposits in the East of Yanbian as an Example

Using high-resolution Pb isotopes to unravel the petrogenesis of Sakurajima volcano, Japan

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