Distinctive REE patterns for tholiitic and calc-alkaline magma series co-occurring at Adatara volcano, Northeast Japan.

Fujinawa, Akihiko

doi:10.2343/geochemj.26.395

Cited by 12 publications

(9 citation statements)

References 49 publications

(70 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10b). The higher content of compatible elements such as MgO, lower content of incompatible elements such as Ba, Th, Y, EREE, and less LREE/HREE enrichment compared to the average of the more common Oak Mountain lavas are consistent with the breccia being derived by a greater degree of partial melting of the same mantle source rocks as the flows (Fujinawa 1992).…”

Section: Oak Mountain Formationsupporting

confidence: 48%

Stratigraphy and geochemistry of Ordovician volcanic rocks of the Eel River area, west-central New Brunswick

Fyffe

2001

atgeol

View full text Add to dashboard Cite

Early Paleozoic turbiditic sedimentary rocks and submarine volcanic-arc rocks in the Eel River area have been designated, respectively, as the Woodstock and Meductic groups and divided into six formations. The Woodstock Group includes interbedded Cambrian to Early Ordovician quartz vvacke. sandstone, and shale of the Baskahegan Formation and overlying Early Ordovician silty mudstone and shale of the Bright Eye Brook Formation. The conformably overlying Meductic Group is divided into the Early Ordovician Porten Road Formation (mainly rhyolite). Eel River Formation (mainly andesite), and Oak Mountain Formation (basalt), and Late Ordovician Belle Lake Formation (feldspathic wacke and shale).Pyroxene-bearing, low-silica andesite in the lower part of the Porten Road Formation is highly enriched in LREE and LFSE. and depleted in HFSE relative to MORB. evidence of subduction in a compressional-continental arc setting. The upper part of the Porten Road Formation comprises an interlayered sequence of quartz-rich rhyolite and quartz-poor dacite. likely derived from melting of continental crust. The Eel River Formation contains hornblende-bearing, high-silica andesite moderately enriched in LFSE. Calc-alkaline basalt from the overlying Oak Mountain Formation includes low-and highalumina basalt varieties like those formed in an extensional-continental arc setting. Volcanic activity in the Meductic Group ceased in the later part of the Early Ordovician as the arc rifted and the subduction zone migrated northwestward with the opening of the Tetagouche back-arc basin. L'andesite a faible teneur en silice qui renferme de la pyroxene dans la partie inferieure de la Formation de Porten Road est fortement enrichie en ETRL (elements de terres rares legers) et en EF1C (elements a faible intensite de champ) et pauvre en EHIC (elements a haute intensite de champ) comparativement aux BDMO (basaltes de la dorsale medio-oceanique). ce qui temoigne d'une subduction au cours de Fetablissement d'un arc compressif-continental. La partie superieure de la Formation de Porten Road comporte une sequence interstratifiee de rhyolite riche en quartz et de dacite pauvre en quartz provenant vraisemblablement de la fusion de la croute continentale. La Formation d'Eel River renferme de Fandesite riche en silice a hornblende moyennement enrichie d'EFIC. Le basalte ealco-alcalin de la Formation sus-jacente d'Oak Mountain comprend des basaltes a faible et forte teneur en alumine comme ceux formes lors de Fetablissement d'un arc d'accretioncontinental. L'activite volcanique dans le groupe de Meductic a cesse vers la fin de FOrdovicien inferieur lorsque Fare s'est effondre et que la zone de subduction a migre vers le nord-ouest avec I'ouverture du bassin marginal de Tetagouche. Traduit par la redaction I n t r o d u c t io nThe Eel River area of west-central New Brunswick (Figs. 1, 2) is underlain by Ordovician volcanic rocks that provide important constraints on the Paleozoic tectonic history of the Appalachian orogen (van Staal and Fyffe 1995a). These vo...

show abstract

Section: Oak Mountain Formationsupporting

confidence: 48%

Stratigraphy and geochemistry of Ordovician volcanic rocks of the Eel River area, west-central New Brunswick

Fyffe

2001

atgeol

View full text Add to dashboard Cite

show abstract

“…The flat REE pattern of the BA2 is identical with an island arc low-K tholeiite series (Fujinawa, 1992;Jakeš and Gill, 1970). Absence of any Eu anomaly suggests plagioclase was not an accumulated phase.…”

Section: Interpretation Of the Datamentioning

confidence: 84%

“…The similarity between the REE patterns of the rhyolites and the first group of basaltic andesites (BA1) suggest that they are genetically related. Their REE pattern is identical with calc-alkaline series in island arc volcanism (Fujinawa, 1992;Gill, 1981). Rhyolites with abundant cognate gabbroic xenoliths show positive Eu anomalies.…”

Section: Interpretation Of the Datamentioning

confidence: 87%

Late Cretaceous infant intra-oceanic arc volcanism, the Central Pontides, Turkey: Petrogenetic and tectonic implications

Aygül

Okay

Oberhänsli

et al. 2015

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

“…The reference slope for discrimination of tholeiitic (TH) and calc‐alkaline (CA) series is from Miyashiro (). The reference data for Quaternary volcanic rocks from NE‐Japan arc are summarized in Table S37 (Ban & Yamamoto, ; Fujinawa, , ; Hunter & Blake, ; Kimura & Yoshida, ; Kimura et al, ; Kudo et al, ; Kuritani, Yoshida, Kimura, Hirahara, et al, ; Moriguti et al, ; Ohba et al, ; Sakuyama & Nesbitt, ; Takahashi et al, ; Tatsumi et al, ; Toya et al, ; Ueki & Iwamori, ; Yamamoto, ).…”

Section: Resultsmentioning

confidence: 99%

Production of High‐Sr Andesite and Dacite Magmas by Melting of Subducting Oceanic Lithosphere at Propagating Slab Tears

et al. 2018

View full text Add to dashboard Cite

We present K-Ar ages, major and trace element concentrations, and Sr-Nd-Pb isotope data for late Cenozoic volcanic rocks from the Chugoku district, southwest Japan arc. Andesite and dacite lavas in this region are enriched in Sr (mostly >800 μg g À1 ) and show geochemical characteristics of volcanic rocks commonly referred to as "adakite." K-Ar dating of these lavas revealed that the eruption of high-Sr andesitic to dacitic magmas occurred during the last 2 Myr, following or concurrent with the eruption of basalt in adjacent regions. Trace-element characteristics of high-Sr andesites and dacites are consistent with the formation of their parent magmas by partial melting of the basaltic layer of the subducting Shikoku Basin Plate. Mass balance modeling of trace element concentrations and isotopic compositions suggests that the parental magmas of high-Sr andesites and dacites are best explained by mixing of partial melts from oceanic crust (F = 5-15%) and sediment (F = 30%) at 80:20 to 55:45 ratios. Spatial coincidence of the occurrences of high-Sr andesites and dacites and seismic gaps of the subducting slab demonstrates the causal link between slab melting and mantle upwelling at slab tears. We speculate that these tears could have been formed by subduction of ridges on the plate. A warm mantle upwelled through tears, preventing the solidification of the siliceous slab melts in the mantle and facilitating the transportation of these melts to the surface.The southwest (SW) Japan arc (Figure 1) is an example of a volcanic field in which high-Sr andesites and dacites occur (Figure 2;Feineman et al., 2013;Kimura et al., 2014;Morris, 1995). Like others, the SW Japan arc is characterized by the occurrence of basalt lavas in closed spatial and temporal proximity. It is PINEDA-VELASCO ET AL.3698

show abstract

Distinctive REE patterns for tholiitic and calc-alkaline magma series co-occurring at Adatara volcano, Northeast Japan.

Cited by 12 publications

References 49 publications

Stratigraphy and geochemistry of Ordovician volcanic rocks of the Eel River area, west-central New Brunswick

Stratigraphy and geochemistry of Ordovician volcanic rocks of the Eel River area, west-central New Brunswick

Late Cretaceous infant intra-oceanic arc volcanism, the Central Pontides, Turkey: Petrogenetic and tectonic implications

Production of High‐Sr Andesite and Dacite Magmas by Melting of Subducting Oceanic Lithosphere at Propagating Slab Tears

Contact Info

Product

Resources

About