Geochemistry of inaccessible island volcanics

Cliff, R. A.; Baker, P. E.; Mateer, Niall J.

doi:10.1016/0009-2541(91)90073-z

Cited by 57 publications

(19 citation statements)

References 17 publications

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“…However, the range of isotopic ratios observed in the Jejudo and Yeong-il samples in nearly encompassed by the range observed in the northwestern Kyushu vol canic rocks (Morris et al, 1997). Meanwhile, the ENd values from the Ulreungdo samples plotted in the more negative field than those of southwest ern Japan, which is similar to that of the Tristan da Cunha, known as a enriched mantle type show ing typical DUPAL anomaly characteristics (Cliff et al, 1991 Tatsumoto and Nakamura (1991) studied al kali volcanic rocks from the Ulreungdo and Dogdo and reported Nd, Sr and Pb isotopic compositions. Based on these data they conclude that alkali basalts with the EMI characteristics of the Ulreungdo and Dogdo originated from old mantle lithosphere which was metasomatized early (prior to the Proterozoic) with subduction-related fluids.…”

Section: Nd and Sr Isotopic Datamentioning

confidence: 51%

“…The Nd-Sr isotopic data from this study are compared with data from Oki Dozen and south west Japan (Morris et al, 1997) and Japanese is land Wasserbug, 1981, 1986;White and Patchett, 1984;Fujibayashi et al, 1988;Morris and Kagami, 1989;Nakamura et al, 1990;Tatsumodo and Nakamura, 1991) and Tristan da Cunha (White and Hofmann, 1982;Cliff et al, 1991). According to Tatsumoto and Nakamura (1991) and Morris et al (1997), Japanese volcanic rocks have divided into two compositional groups.…”

Section: Nd and Sr Isotopic Datamentioning

confidence: 86%

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Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

et al. 1999

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Section: Nd and Sr Isotopic Datamentioning

confidence: 51%

Section: Nd and Sr Isotopic Datamentioning

confidence: 86%

Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

et al. 1999

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“…% erosion to reach its current form. Available geochemical data for Inaccessible Island indicate a somewhat less alkaline trend than seen on Tristan, ranging from alkali basalts (found as thin lava flows and cinder cones) to trachytes and phonolites (Cliff et al, 1991).…”

Section: Tristan Da Cunhamentioning

confidence: 96%

Peralkaline Felsic Magmatism of the Atlantic Islands

Jeffery

Gertisser

2018

Front. Earth Sci.

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The oceanic-island magmatic systems of the Atlantic Ocean exhibit significant diversity in their respective sizes, ages, and the compositional ranges of their eruptive products. Nevertheless, almost all of the Atlantic islands and island groups have produced peralkaline felsic magmas, implying that similar petrogenetic regimes may be operating throughout the Atlantic Ocean, and arguably elsewhere. The origins of peralkaline magmas are frequently linked to low-degree partial melting of enriched mantle, followed by protracted differentiation in the shallow crust. However, additional petrogenetic processes such as magma mixing, crustal melting, and contamination have been identified at numerous peralkaline centers. The onset of peralkalinity leads to magma viscosities lower than those typical for metaluminous felsic magmas, which has profound implications for processes such as crystal settling. This study represents a compilation of published and original data which demonstrates trends that suggest that the peralkaline magmas of the Atlantic Ocean islands are generated primarily via extended (up to ∼ 95%), open system fractional crystallization of mantle-derived mafic magmas. Crustal assimilation is likely to become more significant as the system matures and fusible material accumulates in the crust. Magma mixing may occur between various compositional end-members and may be recognized via hybridized intermediate magmas. The peralkaline magmas are hydrous, and frequently zoned in composition, temperature, and/or water content. They are typically stored in shallow crustal magma reservoirs (∼ 2-5 km), maintained by mafic replenishment. Low melt viscosities (1 × 10 1.77 to 1 × 10 4.77 Pa s) facilitate two-phase flow, promoting the formation of alkali-feldspar crystal mush. This mush may then contribute melt to an overlying melt lens via filter pressing or partial melting. We utilize a three-stage model to account for the establishment, development, and termination of peralkaline magmatism in the ocean island magmatic systems of the Atlantic. We suggest that the overall control on peralkaline magmatism in the Atlantic is magma flux rate, which controls the stability of upper crustal magma reservoirs. The abundance of peralkaline magmas in the Atlantic suggests that their development must be a common, but not inevitable, stage in the evolution of ocean islands.

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“…Their Th/U ratios are over 0.5 [35] . Some zircons [22,23] ; HIMU, mantle with high U/Pb ratio [24,25] ; EM I, enriched mantle l [26,27] ; EM II, enriched mantle 2 [28,29] ; NHRL, the northern hemisphere reference line.…”

Section: Shrimp Zircon U-pb Dating Of the Xialan Complexmentioning

confidence: 99%

The Early Jurassic magmatism in northern Guangdong Province, southeastern China: Constraints from SHRIMP zircon U-Pb dating of Xialan complex

et al. 2009

Sci. China Ser. D-Earth Sci.

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This paper reports SHRIMP zircon U-Pb ages of 196±2 Ma for granite, and 195±1 Ma for gabbro from theXialan complex in the Meizhou area, northern Guangdong Province. These results shed new light on the calm stage of magmatic activity in southeastern China during 200-180 Ma, and revealed that the back-arc extension induced by the subduction of the western Pacific plate may have begun at 195 Ma at least. Field observation on the fresh outcrops allows us to recognize some features formed by magma mixing. A part of the gabbro has a fine-grained rim of 20-30 cm at the margin, and thins gradually toward the granite; numerous dark fine-grained to microcrystalline dioritic enclaves developed in the granite. These enclaves vary in shape and size, dark minerals concentrated at the margin of enclaves, and the contact between enclaves and host rock is either obvious or obscure, or gradational. In addition, needle-shaped apatites are included in the enclaves. The REE patterns of gabbros, as well as the trace element patterns, are generally consistent with those of granitic rocks. The above characters further suggest that in the Early Jurassic the injection of basic magma had melted deep continental crust and produced acidic magma, and the Xialan complex was produced by the mixing of them.

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Geochemistry of inaccessible island volcanics

Cited by 57 publications

References 17 publications

Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

Peralkaline Felsic Magmatism of the Atlantic Islands

The Early Jurassic magmatism in northern Guangdong Province, southeastern China: Constraints from SHRIMP zircon U-Pb dating of Xialan complex

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