Adakitic lavas in the Central Luzon back‐arc region, Philippines: lower crust partial melting products?

Yumul, Graciano P.; Dimalanta, Carla B.; Bellón, Hervé; Faustino, Decibel V.; Jesus, Joel V. De; Tamayo, Rodolfo A.; Jumawan, Ferdinand T.

doi:10.1111/j.1440-1738.2000.00297.x

Cited by 21 publications

(19 citation statements)

References 43 publications

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“…The host lava is a dacite displaying chemical characteristic considered as typical of adakites (Maury et al . 2000; Yumul et al . 2000; Jego et al .…”

Section: Petrologic and Geochemical Datamentioning

confidence: 99%

The oceanic substratum of Northern Luzon: Evidence from xenoliths within Monglo adakite (the Philippines)

et al. 2007

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International audienceA 8.65 Ma adakitic intrusive sheet exposed near Monglo village in the Baguio District of Northern Luzon contains a suite of ultramafic and mafic xenoliths including in order of abundance: spinel dunites showing typical mantle-related textures, mineral and bulk rock compositions, and serpentinites derived from them; amphibole-rich gabbros displaying incompatible element patterns similar to those of flat or moderately enriched back-arc basin basalt magmas; and amphibolites derived from metabasalts and/or metagabbros of identical affinity. A single quartz diorite xenolith carrying a similar subduction-related geochemical signature has also been sampled. One amphibolite xenolith provided a whole-rock K-Ar age of 115.6 Ma (Barremian). We attribute the origin of this suite to the sampling by ascending adakitic magmas of a Lower Cretaceous ophiolitic complex located at a depth within the 30-35 km thick Luzon crust. It could represent an equivalent of the Isabela-Aurora and Pugo-Lepanto ophiolitic massifs exposed in Northern Luzon

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“…The host lava is a dacite displaying chemical characteristic considered as typical of adakites (Maury et al . 2000; Yumul et al . 2000; Jego et al .…”

Section: Petrologic and Geochemical Datamentioning

confidence: 99%

The oceanic substratum of Northern Luzon: Evidence from xenoliths within Monglo adakite (the Philippines)

et al. 2007

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“…Adakites are originally referred to volcanic rocks with major components from slab melts usually associated with subduction of oceanic crust younger than 25 Ma (Kay 1978;Defant and Drummond 1990). In addition to slab melting, there are several other mechanisms proposed for the formation of adakite or adakitic rocks, which include partial melting of the lower continental crust (Yumul et al 2000;Chung et al 2003;Gao et al 2004;Zellmer 2009;Zellmer et al 2012), underplated new crust (Petford and Atherton 1996), and fractional crystallization of normal arc magmas (Castillo et al 1999;Castillo 2006;Macpherson et al 2006;Richards and Kerrich 2007;Rodríguez et al 2007;Richards 2011). Recent studies have proposed that slab melts can be discriminated from lower continental crust melt through chemical characteristics (Liu et al 2010a;Ling et al 2011b;Sun et al 2011Sun et al , 2012.…”

Section: Introductionmentioning

confidence: 99%

Destruction of the North China Craton Induced by Ridge Subductions

Ling

Li²,

Ding

et al. 2013

The Journal of Geology

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A B S T R A C TThe destruction of the North China Craton (NCC) mainly occurred in the Cretaceous and has been attributed to a "top-down" rapid delamination, "bottom-up" long-term thermal/chemical erosions, or hydration by subductionreleased fluids. On the basis of the distribution of one Jurassic and two Early Cretaceous adakite belts and the drifting history of the paleo-Pacific Plate, we propose that three ridge subduction events dominated the large-scale decratonization in the NCC. Both physical erosion and magmatism induced by ridge subduction contributed to the destruction of the NCC; the last ridge subduction, at Ma, was the key driving force in the final destruction. We present 130 ‫ע‬ 5 mineralogical, geochemical, and isotopic data in support of the ridge subduction model: flat subduction of a spreading ridge resulted in stronger physical erosion on the thick lithosphere mantle of the NCC. Consequently, slab melting occurred during ridge subduction, forming adakites with mantle Mg isotope compositions, followed by A-type granites as a result of asthenosphere upwelling. Delaminated lower continental crust was also partially melted after reacting with hydrous magmas, as indicated by eclogite xenoliths, resulting in a zircon age spectrum similar to that of the NCC and some adakitic samples with chemical characteristics similar to those of the Dabie adakites. The final decratonization was triggered by the last ridge subduction, with both physical erosion (flat subduction) and thermal erosion (adakitic and A-type magmatisms). Given that ridge subduction has occurred throughout Earth's history, the associated decratonization processes are presumably a common phenomenon that modified the chemical compositions of the continental crust.

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“… This suite of rocks has now been found in a variety of tectonic settings and is no longer confined only to subduction‐related settings as originally proposed (Kay 1978; Maury et al. 1996; Yumul et al. 2000; Castillo 2006).…”

Section: Generation Of Adakitesmentioning

confidence: 70%

“…(2003) on Tibetan rocks attributed the generation of adakitic melts to the partial melting of thickened crust. It is very clear that: (i) the term ‘adakites’ can no longer be used to define a specific tectonic setting; (ii) that the generation of adakitic rocks connotes different processes and significance; and (iii) the term adakites and adakitic rocks should be descriptive rather than have genetic connotations (Yumul et al. 2000; Castillo 2006; Richards & Kerrich 2007).…”

Section: Generation Of Adakitesmentioning

confidence: 99%

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Crustal thickness and adakite occurrence in the Philippines: Is there a relationship?

Dimalanta¹,

Yumul

2008

Island Arc

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Adakites are increasingly being recognized worldwide in a variety of tectonic settings. Models on the formation of this geochemically distinct class of volcanic rocks have evolved from partial melting of subducted young, hot oceanic slabs to magmatism resulting from oblique subduction, low-angle or flat subduction, or even slab-tearing. Some workers have also pointed to the partial melting of thickened crust to explain the generation of adakitic melts. Rare earth element ratios from adakites and adakitic rocks in the Philippines were used in this study to obtain approximations of the levels where they were generated. These were tied to available geophysical data that defines the crustal thickness of the areas where the samples were collected. High Sm/Yb and La/Yb ratios denote the involvement of amphiboles, and in some cases garnet, in the generation of adakites and adakitic magmas. The presence of amphibole and garnet as residual phases suggests high pressures corresponding to thicker crust (~30 to 45 km). Adakites and adakitic rocks formed through processes other than melting of subducted young oceanic crust would need Ն30 km to account for the heavy rare earth element signatures. If mantle fractionation is not the process involved, crustal thickness is critical to generate adakites and adakitic rocks.

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Adakitic lavas in the Central Luzon back‐arc region, Philippines: lower crust partial melting products?

Cited by 21 publications

References 43 publications

The oceanic substratum of Northern Luzon: Evidence from xenoliths within Monglo adakite (the Philippines)

The oceanic substratum of Northern Luzon: Evidence from xenoliths within Monglo adakite (the Philippines)

Destruction of the North China Craton Induced by Ridge Subductions

Crustal thickness and adakite occurrence in the Philippines: Is there a relationship?

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