Delayed partial melting of subduction-modified mantle in papua new guinea

Johnson, R. W.; Mackenzie, D. E.; Smith, I. E.

doi:10.1016/0040-1951(78)90114-2

Cited by 118 publications

(49 citation statements)

References 41 publications

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“…Lin et al 1989), or resampling of upper mantle earlier modified by subduction in the Cambrian (Wyborn 1992). Other examples of an inherited chemistry occur in Papua new Guinea (Johnson et al 1978), in the Colville Igneous Complex of nW uSA (Morris & Hooper 1997) and in Ediacaran to early Cambrian basins in the Iberian Massif (Pereira et al 2006). Such a scenario has also been postulated for the Cambrian mafic volcanic rocks of the Mt.…”

Section: A New Tectonic Modelmentioning

confidence: 92%

Ordovician marginal basin evolution near the palaeo-Pacific east Gondwana margin, Australia

Quinn

Percival

Glen

et al. 2014

JGS

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Although the Ordovician Macquarie Arc, part of the eastern Lachlan Orogen of southeastern Australia, has long been considered to be an intra-oceanic arc within an accretionary orogen, key characteristics contrast with more typical examples of accreted arcs. Significantly, multiple stacked phases of mafic to intermediate volcanic rocks, with suprasubduction-zone chemistry, are flanked to the east and west by extensive, coeval continental margin turbidite, chert and black shale sequences. By analysing stratigraphic and contact relationships within and between the volcanic rocks, ophiolitic components ( sensu lato ) and turbidite sequences, constrained by precise biostratigraphy, we document a repeated cycle of uplift, upper-plate extension and collapse common to all sequences. This cycle is interpreted as resulting from localized extension (rifting or hyper-extension and lower-crustal delamination) within a continent-margin sequence developed upon an already established marginal or back-arc basin of probable middle to late Cambrian age. Our interpretation provides a counter-example to prevailing arc accretion models by inferring extensional tectonics at the palaeo-Pacific east Gondwana margin during the Ordovician with development of alkalic and calc-alkalic Cu–Au porphyry deposits away from an active arc system.

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Section: A New Tectonic Modelmentioning

confidence: 92%

Ordovician marginal basin evolution near the palaeo-Pacific east Gondwana margin, Australia

Quinn

Percival

Glen

et al. 2014

JGS

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“…In this case, these trace element and isotopic signature were inherited from the mantle source region modified previously by fluids released from subducted slab (Johnson et al 1978;Hawkesworth et al 1995). Reactivation, i.e.…”

Section: Generation Of Magmas With 'Subduction-related' Geochemistrymentioning

confidence: 98%

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Harangi

Downes

Seghedi³

2006

Memoirs

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“…Although the Tertiary to Quaternary K-rich rocks from the Highlands volcanic province (Papua New Guinea) intruded within an island arc, Johnson et al (1978) demonstrated that the K-rich component was probably derived from CLM domains enriched by preTertiary subduction events. Metasomatic assemblages consisting of phlogopite, diopside, richterite, and accessory minerals can be stored in veins of the CLM and reactivated during later melting events.…”

Section: Introductionmentioning

confidence: 99%

Age, geodynamic setting, and mantle enrichment processes of a K-rich intrusion from the Meissen massif (northern Bohemian massif) and implications for related occurrences from the mid-European Hercynian

Wenzel

Mertz

Oberhänsli

et al. 1997

Geologische Rundschau

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The plutonic complex of the Meissen massif (northern margin of the Bohemian massif) comprises dioritic to mainly monzonitic and granitic rocks. The diorite to monzonite intrusions show major and trace element patterns typical for shoshonitic series. The chemical signatures of less crustally contaminated diorites are similar to arc-related shoshonitic rocks derived from continental lithospheric mantle (CLM) sources previously enriched by subduction of altered oceanic crust. Laser step heating Ar/Ar analyses on actinolitic to edenitic amphiboles from geographically different occurrences of the monzonitic intrusion yielded concordant plateau ages as well as total gas ages ranging from 329.1$1.4 to 330.4$1.4 Ma and from 330.4$2.1 to 330.6$1.8 Ma, respectively. These cooling ages are indistinguishable from sensitive highresolution ion microprobe (SHRIMP) U/Pb intrusion ages measured on magmatic zircon rims from the monzonite (Nasdala et al., submitted). This shows that the monzonite intrusion is probably not related temporally to active subduction because it postdates eclogites of the adjacent Saxonian Erzgebirge by approximately 20 Ma. The shoshonitic magmas intruded during strike-slip tectonism along the Elbe valley zone. The enrichment of their mantle sources may be of Upper Devonian/Lower Carboniferous age or older. Intrusions of shoshonitic to ultra-potassic (K-rich) rocks during the Upper Visean/Namurian are widespread in the Moldanubian zone. Based on similar ages and structural relationships a similar post-collisional setting to the Meissen shoshonitic rocks can be demonstrated. Most of these occurrences cut high-grade nappe units which were subducted during the Upper Devonian/Lower Carboniferous. In contrast to the Meissen massif, at least the ultra-potassic members of the Central and the South Bohemian batholiths were derived from CLM sources enriched by fluids or melts released from subducted oceanic crust and by greater portions of crustal material. Despite the similar postcollisional geodynamic setting of the K-rich intrusions, different enrichment processes generated mid-European Hercynian CLM sources with heterogeneous major and trace element and isotopic signatures.

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Delayed partial melting of subduction-modified mantle in papua new guinea

Cited by 118 publications

References 41 publications

Ordovician marginal basin evolution near the palaeo-Pacific east Gondwana margin, Australia

Ordovician marginal basin evolution near the palaeo-Pacific east Gondwana margin, Australia

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Age, geodynamic setting, and mantle enrichment processes of a K-rich intrusion from the Meissen massif (northern Bohemian massif) and implications for related occurrences from the mid-European Hercynian

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