Geochemical and geodynamical constraints on subduction zone magmatism

McCulloch, Malcolm T.; Gamble, J. A.

doi:10.1016/0012-821x(91)90029-h

Cited by 1,259 publications

(491 citation statements)

References 51 publications

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“…1980;Tatsumietal. 1986;McCulloch & Gamble 1991;Brenan et al 1995;Keppler 1996), and variability in the composition of the crustal contaminant (De Paolo 1981) mean that elucidation of a unique petrogenetic pathway for any andesitic volcano will be difficult. Several broad interpretations can be made on the basis of the Turoa geochemical dataset.…”

Section: Discussionmentioning

confidence: 99%

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Waight

Price

Stewart

et al. 1999

New Zealand Journal of Geology and Geophysics

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Detailed mapping and sampling on Turoa skifield and surrounding areas on Mt Ruapehu has enabled identification of individual flow packets that represent small scale eruptive events during the major cone-building episodes previously identified on Ruapehu by Graham & Hackett. The area is dominated by plagioclase-pyroxenephyric andesitic lavas of Mangawhero Formation, which are petrographically and geochemically typical of post-120 ka Ruapehu lavas. Although the lavas are from a relatively small area of the volcano, geochemical and isotopic compositions show a range in variation similar to that observed for the entire volcano. Examination of geochemical variations between individual flow packets and also between sequential C98039Received 15 October 1998; accepted 15 June 1999 lava flows indicates complex processes of assimilation and influx of "new", variably evolved and fractionated magmas into high level magma chambers. These chambers are most likely heterogeneous, and individual eruptions may also sample compositionally distinct regions of the same chamber. It is probable that a complex plumbing system exists beneath Ruapehu with at least two levels of magma storage, evolution, and crustal interaction. Consequently, attempts to numerically quantify such a complex system using models such as assimilation-fractional crystallisation processes are inherently oversimplifications.

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Section: Discussionmentioning

confidence: 99%

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Waight

Price

Stewart

et al. 1999

New Zealand Journal of Geology and Geophysics

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“…In such systems, the concentration of Ba 2+ in hydrothermal fluid increases whereas that of SO 4 2− tends to decrease via high -temperature water -rock interactions (e.g., McDuff and Edmond, 1982;You et al, 1996). Magmas in subduction zones and back -arc basins have elevated Ba contents as compared to mid -ocean ridge basalts (MORB), because Ba is a fluid -mobile incompatible element and is therefore added to the magma source region via the dehydration of the subducted slab during plate subduction (e.g., McCulloch and Gamble, 1991;Tatsumi and Eggins, 1995;You et al, 1996). The barite contents in hydrothermal mineralization are generally high in volcanic arc and back -arc basin settings relative to those in MORs.…”

Section: Introductionmentioning

confidence: 99%

Barite geochemistry from hydrothermal chimneys of the Okinawa Trough: insight into chimney formation and fluid/sediment interaction

Noguchi

Shinjo

Ito

et al. 2011

Journal of Mineralogical and Petrological Sciences

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“…6). The mafic rocks also have relatively high Nb/La ratios (1.1-1.6), distinguishing them from continental arc basalts (McCulloch and Gamble, 1991). It is noted that the MORB normalized trace element patterns for these samples (Fig.…”

Section: Major and Trace Element Datamentioning

confidence: 86%

K-Ar dating, geochemical and Sr-Nd-Pb isotopic systematics of Paleocene mafic rocks in Central Jiangxi, SE China: Evidence for lithosphere replacement

Xie

Mao

et al. 2006

Geochem. J.

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Geochemical and isotopic studies were carried out on Paleocene mafic rocks in the Taihe Basin, central Jiangxi, Southeast China, in order better to understand their magma sources and tectonic implications. K-Ar dating results show that these mafic rocks intruded during the Paleocene (50-65 Ma). These Paleocene mafic rocks are porphyritic diabase and have similar geochemical features, such as strong enrichment of large ion lithophile element (LILE, e.g., Rb, Ba, Sr), slight enrichment of light rare earth element (LREE) and high field strength element (HFSE, e.g., Nb, Ta, Ti, P). The mafic rocks are also characterized by high rare earth element (REE) and minor Eu anomalies (δEu = 0.88-1.2) and have uniform initial 87 Sr/ 86 Sr (0.7041-0.7064) and Pb isotopic composition ( 206 Pb/ 204 Pb = 18.338-18.677) as well as a relatively wide range of initial Nd isotopic ratios (ε Nd (T)) varying from +0.8 to +6.2. These geochemical characteristics are different from those of subduction-related basalts, but similar to oceanic island basalts (OIB). Geochemical and isotopic evidence suggests that mafic rocks in the Taihe Basin were not significantly affected by crustal contamination and originated from asthenospheric mantle with a minor involvement of EM 2 mantle component. It is noted that Cretaceous basaltic rocks in Southeast China show enriched geochemical and isotopic compositions and were derived from a highly heterogeneous lithospheric mantle with minor asthenosphere components. On the other hand, Late Cenozoic basalts in Southeast China, which display OIB-like geochemical characteristics, were probably generated by melting of depleted asthenospheric mantle (DMM or MORB) with an involvement of EM 2 lithospheric mantle and a paucity of EM 1 lithospheric mantle. The Paleocene mafic rocks of the Taihe Basin exhibit transitional geochemical features between Cretaceous and Late Cenozoic basaltic magmatism, indicating that the involvement of asthenospheric mantle beneath Southeast China increased with time from Late Mesozoic to Cenozoic. It is suggested that the lithosphere replacement beneath Southeast China was associated with lithosphere extension and thinning, with decompression melting of the upwelling asthenosphere having taken place during the Paleocene period. Lithosphere replacement might be related to subduction roll-back or/and steepening of Paleo-Pacific plate due to injection of asthenospheric material into the mantle wedge beneath Southeast China.

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Geochemical and geodynamical constraints on subduction zone magmatism

Cited by 1,259 publications

References 51 publications

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Barite geochemistry from hydrothermal chimneys of the Okinawa Trough: insight into chimney formation and fluid/sediment interaction

K-Ar dating, geochemical and Sr-Nd-Pb isotopic systematics of Paleocene mafic rocks in Central Jiangxi, SE China: Evidence for lithosphere replacement

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