Crustal contributions to arc magmatism in the Andes of Central Chile

Hildreth, Wes; Moorbath, S.

doi:10.1007/bf00372365

Cited by 2,031 publications

(1,063 citation statements)

References 94 publications

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“…The rest of the voluminous magmas of the study area represent mixtures between the highly enriched mantle melts and the felsic crustal melts. Since there are no signs of this mixing at the present level of exposure, we infer that the mixing processes took place deeper in the crust, in some sort of magma storage area, which could correspond to a MASH (Melting Assimilation Storage and Homogenisation) zone (Hildreth and Moorbath, 1988) or a deep crustal hot zone (Annen et al, 2006). The magmatic enclaves present in some of the felsic rocks of the area were not formed from either of the two main magmas mentioned above.…”

Section: Discussionmentioning

confidence: 73%

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Clemens

Darbyshire

Flinders

2009

Lithos

113

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The 425 Ma Arrochar and Garabal Hill-Glen Fyne complexes of highland Scotland are examples of post-orogenic magmatism accompanying extensional collapse of an orogen, in this case the Caledonian. The rocks are dominantly high-K series, but range from medium-K to shoshonitic. Mantle upwelling, melting and the intrusion of large volumes of mafic magma into the crust are inferred to have accompanied lithospheric thinning, and to have provided the heat source for melting of young arc crust accreted during the preceding subduction epoch.Fluids evolved from the subducting slab are inferred to have caused high degrees of enrichment in the overlying mantle wedge. Deep in the crust, the mantle-derived, K-rich mafic to intermediate magmas mixed with felsic crustal melts to form the spectrum of magmas intruded in the two complexes. Microgranular enclaves in the granitic rocks represent mafic magmas derived from the enriched mantle and hybridised by reaction, diffusion and mechanical mixing with their host felsic magmas, but they do not form part of the evolutionary series that produced the host magmas. Rather than inheriting its LILEenriched character directly from crustal melts, or from crustal assimilation by mafic magmas, the high-K series may commonly owe at least part of its potassic character to the involvement of mantle (highly metasomatised by slab-derived fluids) as a major magma source. Enclave suites, though prominent in some granitic rocks should not be assumed to represent magmas that played a significant role in the production of the chemical variations in their host magmas.

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Section: Discussionmentioning

confidence: 73%

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Clemens

Darbyshire

Flinders

2009

Lithos

113

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“…Medium-K calc-alkaline magmatism with mostly intermediate composition (commonly called arcrelated magmatism) results from (1) partial melting of a hydrous mantle source metasomatized during the subduction of an oceanic lithosphere and (2) a subsequent episode of magma fractionation and crustal assimilation in the melting assimilation storage and homogenization (MASH) zone at the base of the crust [Gill, 1981;Hildreth and Moorbath, 1988;Harangi et al, 2006]. In the eastern Mediterranean region, this medium-K calc-alkaline magmatism is represented with the late Cretaceous Balkans-Pontides magmatic province (figures 8a-h) [Yılmaz et al, 1997; A C C E P T E D M A N U S C R I P T…”

Section: Southward Retreat Of the Subduction Zone And Magma Genesismentioning

confidence: 99%

Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

2016

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“…In south-central Chile, the Andean Cordillera overlies a thinned crust (Hildreth & Moorbath 1988). Between the subduction of the Juan Fernandez Ridge (33 • S) and the Chile Triple Junction (46 • S) major stratovolcanoes occur along the so-called Southern Volcanic Zone in the Andean Cordillera (Stern 2004).…”

Section: G E O L O G I C a L S E T T I N Gmentioning

confidence: 99%

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

Schill

Pavez

Díaz

et al. 2016

Geophysical Journal International

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Crustal contributions to arc magmatism in the Andes of Central Chile

Cited by 2,031 publications

References 94 publications

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

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