Isotopic characteristics of subduction fluids in an intra-oceanic setting, Izu–Bonin Arc, Japan

Taylor, Rex N.; Nesbitt, R.W.

doi:10.1016/s0012-821x(98)00182-4

Cited by 232 publications

(218 citation statements)

References 41 publications

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“…1993, Nakajima and, or by partial melting of descending basaltic oceanic crust (Martin, 1986;Nelson and Forsythe, 1989;Defant and Drummond, 1990;Drummond et al, 1996). The SrI of the rocks in the Ashigawa and Tonogi intrusions are close to the range of those of lavas (0.7032 0.7039) in the northern Izu Bonin arc (Notsu et al, 1983;Taylor and Nesbitt, 1998), being consistent with the derivation of the Ashigawa and Tonogi granitic rocks from mantle derived basaltic magmas or from partial melting of basaltic crust of the Izu arc. The slab melting origin for the Tonogi and Ashigawa granitic rocks is most unlikely as their REE abundance is not consistent with garnet involvement in their genesis (cf.…”

Section: Origin Of the Ashigawa And Tonogi Parental Magmasupporting

confidence: 72%

Petrogenesis of Ashigawa and Tonogi granitic intrusions, southern part of the Miocene Kofu Granitic Complex, central Japan: M-type granite in the Izu arc collision zone

Saito

Arima

Nakajima

et al. 2004

Journal of Mineralogical and Petrological Sciences

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The Ashigawa and the Tonogi intrusions comprise the southern part of the Miocene Kofu Granitic Complex (KGC), which is the largest pluton exposed in the Izu collision zone. The Ashigawa intrusion mainly consists of tonalite and subordinate amounts of trondhjemite, and the Tonogi intrusion is predominantly composed of tonalite. The rocks in both intrusions are classified as M type granite. These are characterized by relatively low K 2 O (<1.9 wt.%) and Rb (<48 ppm) and LREE enriched chondrite normalized REE patterns with a marked negative Eu anomaly. Compared to the Tanzawa tonalites distributed in the south of the KGC, the Ashigawa and Tonogi granitic rocks have higher LILE, REE and Sr isotope compositions at a given whole rock SiO 2 content. Although the Ashigawa intrusion has distinctly different petrographical and geochemical characteristics from the Tonogi intrusion, both intrusions exhibit nearly identical Sr isotopic composition (0.7037 0.7043 at 13Ma) and well defined variation in whole rock compositions, suggesting that they are comagmatic. The crystal fractionation modeling involving removals of amphibole, plagioclase and magnetite from a tonalitic parental magma composition well represents the major and trace element variation of the Ashigawa and Tonogi granitic rocks. The Rayleigh fractionation modeling for whole rock REE abundance is also in a good agreement with the observed whole rock data. Mass balance modeling suggests that the proposed tonalitic parental magma can be derived by 40 % melting of hydrous basalt compositionally similar to the basalt occurring in the rift basin of northern Izu Bonin arc. Anatexis of hydrous basaltic lower crust of the northern Izu Bonin arc is a likely process for the formation of Ashigawa Tonogi parental magma.

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Section: Origin Of the Ashigawa And Tonogi Parental Magmasupporting

confidence: 72%

Petrogenesis of Ashigawa and Tonogi granitic intrusions, southern part of the Miocene Kofu Granitic Complex, central Japan: M-type granite in the Izu arc collision zone

Saito

Arima

Nakajima

et al. 2004

Journal of Mineralogical and Petrological Sciences

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“…Radiogenic isotope data from Talkeetna arc plutonic rocks analyzed in this study and by Rioux et al [2007]. Modern arc fields based on data from McCulloch and Perfit [1981], Ewart and Hawkesworth [1987], Woodhead [1989], Pearce et al [1995], Ewart et al [1998], Taylor and Nesbitt [1998], and Leat et al [2003] were recalculated to be consistent with the standard and normalization values in this study. The Tonga-Kermadec field excludes data from the northern Tonga islands.…”

Section: Felsic Magmatism In Intraoceanic Arcsmentioning

confidence: 99%

Intermediate to felsic middle crust in the accreted Talkeetna arc, the Alaska Peninsula and Kodiak Island, Alaska: An analogue for low‐velocity middle crust in modern arcs

et al. 2010

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Seismic profiles of several modern arcs have identified thick, low‐velocity midcrustal layers (Vp = 6.0–6.5 km/s) that are interpreted to represent intermediate to felsic plutonic crust. The presence of this silicic crust is surprising given the mafic composition of most primitive mantle melts and could have important implications for the chemical evolution and bulk composition of arcs. However, direct studies of the middle crust are limited by the restricted plutonic exposures in modern arcs. The accreted Talkeetna arc, south central Alaska, exposes a faulted crustal section from residual subarc mantle to subaerial volcanic rocks of a Jurassic intraoceanic arc and is an ideal place to study the intrusive middle crust. Previous research on the arc, which has provided insight into a range of arc processes, has principally focused on western exposures of the arc in the Chugach Mountains. We present new U‐Pb zircon dates, radiogenic isotope data, and whole‐rock geochemical analyses that provide the first high‐precision data on large intermediate to felsic plutonic exposures on Kodiak Island and the Alaska Peninsula. A single chemical abrasion–thermal ionization mass spectrometry analysis from the Afognak pluton yielded an age of 212.87 ± 0.19 Ma, indicating that the plutonic exposures on Kodiak Island represent the earliest preserved record of Talkeetna arc magmatism. Nine new dates from the extensive Jurassic batholith on the Alaska Peninsula range from 183.5 to 164.1 Ma and require a northward shift in the Talkeetna arc magmatic axis following initial emplacement of the Kodiak plutons, paralleling the development of arc magmatism in the Chugach and Talkeetna mountains. Radiogenic isotope data from the Alaska Peninsula and the Kodiak archipelago range from ɛNd(t) = 5.2 to 9.0 and 87Sr/86Srint = 0.703515 to 0.703947 and are similar to age‐corrected data from modern intraoceanic arcs, suggesting that the evolved Alaska Peninsula plutons formed by extensive differentiation of arc basalts with little or no involvement of preexisting crustal material. The whole‐rock geochemical data and calculated seismic velocities suggest that the Alaska Peninsula represents an analogue for the low‐velocity middle crust observed in modern arcs. The continuous temporal record and extensive exposure of intermediate to felsic plutonic rocks in the Talkeetna arc indicate that evolved magmas are generated by repetitive or steady state processes and play a fundamental role in the growth and evolution of intraoceanic arcs.

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“…The seamount chains are situated entirely to the west of the volcanic front, in a rear-arc position extending 38-60 km toward the back-arc. Our use of the term rear-arc follows that of Taylor and Nesbitt (1998) and Stern et al (2006), referring to magmatism distinctly farther from the trench than the volcanic front, but also distinct from more distal back-arc basin magmatism. Several of the seamounts in the chains rise more than 2.0 km above base level with volumes over 140 km 3 (Table 1).…”

mentioning

confidence: 99%

Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry

Leat

Day

Tate

et al. 2013

Journal of Volcanology and Geothermal Research

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New multibeam bathymetry data are presented for the South Sandwich intra-oceanic arc which occupies the small Sandwich plate in the South Atlantic, and is widely considered to be a simple end-member in the range of intra-oceanic arc types. The images show for the first time the distribution of submarine volcanic, tectonic and erosional-depositional features along the whole length of the 540 km long volcanic arc, allowing systematic investigation of along-arc variations. The data confirm that the volcanic arc has a simple structure composed of large volcanoes which form a well-defined volcanic front, but with three parallel crosscutting seamount chains extending 38-60 km from near the volcanic front into the rear-arc. There is no evidence for intra-arc rifting or extinct volcanic lines. Topographic evidence for faulting is generally absent, except near the northern and southern plate boundaries. Most of the volcanic arc appears to be built on ocean crust formed at the associated back-arc spreading centre, as previously proposed from magnetic data, but the southern part of the arc appears to be underlain by older arc or continental crust whose west-facing rifted margin facing the back-arc basin is defined by the new bathymetry. The new survey shows nine main volcanic edifices along the volcanic front and ca. 20 main seamounts. The main volcanoes form largely glaciated islands with summits 3.0-3.5 km above base levels which are 2500-3000 m deep in the north and shallower at 2000-2500 m deep in the south. Some of the component seamounts are interpreted to have been active since the last glacial maximum, and so are approximately contemporaneous with the volcanic front volcanism. Seven calderas, all either submarine or ice-filled, have been identified: Adventure volcano, a newly discovered submarine volcanic front caldera volcano is described for the first time. All but one of the calderas are situated on summits of large volcanoes in the southern part of the arc, and most are associated with current or historic volcanic or hydrothermal activity. Shallow shelves around the islands are generally 1-10 km wide. Submerged banks up to 1100 m deep are interpreted as subsided erosional surfaces. Seamounts and emergent volcanoes experienced a range of mass wasting processes including by landsliding and smaller mass flows. KeywordsVolcanic arc, subduction zone, caldera, seamount, submarine volcanism The importance of the South Sandwich volcanic arcThe South Sandwich volcanic arc, situated in the South Atlantic ( Fig. 1), is a tectonically simple, active, intra-oceanic arc, and is ideally suited to studies of volcanic arc crustal structure, geochemical investigation of mantle processes above a subduction zone, and sedimentation in an early stage of arc evolution. The active arc is built largely on oceanic crust of the small Sandwich plate which formed about 10 Ma at the back-arc East Scotia ridge spreading centre . The arc is forming in response to steeply inclined subduction of the South American plate beneath the Sand...

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Isotopic characteristics of subduction fluids in an intra-oceanic setting, Izu–Bonin Arc, Japan

Cited by 232 publications

References 41 publications

Petrogenesis of Ashigawa and Tonogi granitic intrusions, southern part of the Miocene Kofu Granitic Complex, central Japan: M-type granite in the Izu arc collision zone

Petrogenesis of Ashigawa and Tonogi granitic intrusions, southern part of the Miocene Kofu Granitic Complex, central Japan: M-type granite in the Izu arc collision zone

Intermediate to felsic middle crust in the accreted Talkeetna arc, the Alaska Peninsula and Kodiak Island, Alaska: An analogue for low‐velocity middle crust in modern arcs

Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry

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