Flux versus decompression melting at stratovolcanoes in southeastern Guatemala

Cameron, B. I.; Walker, James A.; Carr, Michael J.; Patino, L. C.; Matías, O.; Feigenson, Mark D.

doi:10.1016/s0377-0273(02)00304-9

Cited by 99 publications

(67 citation statements)

References 93 publications

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“…This diagram is useful for separating lava with significant slab fluid influx from that generated by decompressional melting. It is important to note that a high degree of LREE mobilization from a subducted slab would reduce the effectiveness of La/Yb as a measure of the degree of mantle melting (Cameron et al 2003). The low Ba/La ratios in the Tokaj Mts lavas allows us to interpret that the parent melt of the studied rock samples was generated by decompression melting.…”

Section: Geochemistry Of Sarmatian Volcanic Rocks In the Tokaj Mts (Nmentioning

confidence: 97%

“…3 relationship between systematic slab input and degree of melting also suggests a more prominent role of decompression melting beneath the Tokaj Mts. The difference in the La/Yb values of rocks are thought to be due to the different degree of mantle melting (Cameron et al 2003) as suggested by Fig. 6B; however, one cannot rule out the affect of fractional crystallization or assimilation of some crustal melts on these values (Davidson et al 2007;Moyen 2009).…”

Section: Geochemistry Of Sarmatian Volcanic Rocks In the Tokaj Mts (Nmentioning

confidence: 99%

“…On the basis of the Ba/La vs. La/Yb diagram (published by Cameron et al 2003; Fig. 6) we can determine the parent melt of the magmas in the Tokaj Mts.…”

Section: Geochemistry Of Sarmatian Volcanic Rocks In the Tokaj Mts (Nmentioning

confidence: 99%

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Geochemistry of Sarmatian volcanic rocks in the Tokaj Mts (NE Hungary) and their relationship to hydrothermal mineralization

Kiss

Gméling

Molnár

et al. 2010

Central European Geology

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In the Tokaj Mts (NE Hungary), which is a part of the Inner Carpathian Volcanic Arc, large amounts of intermediate-acidic calc-alkaline volcanic rocks accumulated in a N-S oriented graben-like structure during the Badenian-Sarmatian-Pannonian period, in relation with the closure of the Alpine Tethys (Penninic) ocean. Although previous research on volcanism and related hydrothermal processes produced a huge number of K/Ar age data no systematic petrochemical database has been available up to now from the Tokaj Mts. In this study we publish new results of geochemical analyses completed on systematically collected basaltic, andesitic, dacitic and rhyolitic rocks, and of the spatialtemporal evaluation of petrochemical signatures, with special reference to origin of magmatism and relationships of rhyolite to hydrothermal mineralization. In the southern Tokaj Mts rhyolite contains K-feldspar phenocrysts, while this phenomenon is absent in the rhyolite from the northern areas of the mountains. In accordance with this, significant potassium enrichment occurs in the south (whole rock K 2 O content varies between 4.35 and 5.61 wt%), whereas rhyolite from the northern Tokaj Mts is less enriched in potassium (K 2 O content is from 3.28 to 5.1 wt%). The most significant difference between the northern and southern dacite is the age of their formation. They were formed at the same time as rhyolite and andesite (between 13.4 and 11 Ma) in the northern Tokaj Mts, while they are much younger (10.57-10.1 Ma) in the southern Tokaj Mts, where they post-date hydrothermal activity. The boron content (10.1-52.12 µg/g) and the patterns of other trace elements of the volcanic rocks show typical subduction-related features; however, direct influx of subduction-related fluids during magma generation can be excluded. A more plausible explanation for the magma genesis is decompression melting of a previously metasomatized mantle, enriched with subduction-related components. Additionally, the unmineralized northern rhyolite samples contain much less Cl (usually below 0.2 wt%) than the high-K rhyolite in the southern part of the Tokaj Mts (usually more than 0. Central European Geology, Vol. 53/4, pp. 377-403 (2010) DOI: 10.1556/CEuGeol.53.2010 Geochemistry Hungarian Academy of Sciences, Debrecen wt%), which correlates with the presence/absence of spatially and temporally related epithermal mineralization in these areas.

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Section: Geochemistry Of Sarmatian Volcanic Rocks In the Tokaj Mts (Nmentioning

confidence: 97%

Section: Geochemistry Of Sarmatian Volcanic Rocks In the Tokaj Mts (Nmentioning

confidence: 99%

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Geochemistry of Sarmatian volcanic rocks in the Tokaj Mts (NE Hungary) and their relationship to hydrothermal mineralization

Kiss

Gméling

Molnár

et al. 2010

Central European Geology

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“…Enrichment in LILE and LREE relative to HFSE and HREE respectively, and negative anomalies of Nb-Ti elements are the specifications of subduction-related magmas. These characteristics are generally related to a mantle source, which has already been enriched in LILE and LREE over HFSE and HREE by metasomatic activity of solutions released from the subducted sediments or slab (Pearce, 1983;Cameron et al, 2003). Many different types of models have been suggested to illustrate this signature in the post-collisional setting such as considering amphibolites, peridotite, and metapelite as a hybrid source in the crustmantle boundary (López-Moro and López-Plaza, 2004), or presenting a theory regarding mixing of magmas in the asthenosphere and enriched lithospheric mantle (Li et al, 2000).…”

Section: Tectonic Settingmentioning

confidence: 99%

U-Pb geochronology, Sr-Nd geochemistry, petrogenesis and tectonic setting of Gandab volcanic rocks, northeastern Iran

et al. 2017

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This paper addresses U-Pb geochronology, Sr-Nd geochemistry, petrogenesis and tectonic setting in the Gandab volcanic rocks. The Gandab volcanic rocks belong to the Sabzevar zone magmatic arc (northeastern Iran). Petrographically, all the studied volcanic rocks indicate porphyritic textures with phenocrysts of plagioclase, K-feldespar, hornblende, pyroxene, and magnetite which are embedded in a fine to medium grained groundmass. As well, amygdaloidal, and poikilitic textures are seen in some rocks. The standard chemical classifications show that the studied rocks are basaltic trachy andesite, trachy andesite, trachyte, and trachy dacite. Major elements reveal that the studied samples are metaluminous and their alumina saturation index varies from 0.71 to 1.02. The chondritenormalized rare earth element and mantle-normalized trace element patterns show enrichment in light rare earth elements (LREE) relative to heavy rare earth elements (HREE) and in large ion lithophile elements (LILE) relative to high field strength elements (HFSE). As well they show a slightly negative Eu anomaly (Eu/Eu* = 0.72 -0.97). The whole-rock geochemistry of the studied rocks suggests that they are related to each other by fractional crystallization. LA-MC-ICP-MS U-Pb analyses in zircon grains from two volcanic rock samples (GCH-119 and GCH-171) gave ages ranging of 5.47 ± 0.22 Ma to 2.44 ± 0.79 Ma, which corresponds to the Pliocene period. In four samples analysed for Sr and Nd isotopes 87 Sr/ 86 Sr ratios range from 0.704082 to 0.705931 and ε Nd values vary between +3.34 and +5. These values could be regarded to as representing mantle derived magmas. Taking into account the comparing rare earth element (REE) patterns, an origin of the parental magmas in enriched lithospheric mantle is suggested. Finally, it is concluded that Pliocene Gandab volcanic rocks are related to the post-collision environment that followed the Neo-Tethys subduction.

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“…A lo largo de su historia, las lavas muestran la presencia de dos componentes geoquímicos: Sabana Redonda (TiO 2 > 1%) y Von Frantzius (TiO 2 < 1%), el primero relacionado con procesos de descompresión adiabática mientras que el último se relaciona con una fusión por presencia de fluidos provenientes de la zona de subducción (Cameron et al, 2002).…”

Section: Discusión Conclusiones Y Trabajos Futurosunclassified

Caracterización geoquímica y petrográfica de las unidades geológicas del macizo del volcán Poás, Costa Rica

Ruiz

Gazel

Alvarado

et al. 2009

Rev. Geol. Amér. Central

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ABSTRACT:The present study defines the stratigraphy of Poás volcano by using geologic, petrographic, geochronologic and geochemical analyses made on the Poás units. The northern flank of the volcano is comprised of the following units: Río Sarapiquí, La Paz Andesites, Tiribí Formation (from Barva volcano, but interdigitated with Poás stratigraphy), Río Cuarto Lavas, Von Frantzius, Cerro Congo, Bosque Alegre and Laguna Kopper. The units on the southern flank are Colima Formation, La Paz Andesites, Tiribí, Achiote, Poasito, Sabana Redonda and Poás Lapilli Tuff. The central part of the volcano is made by the Poás Summit Unit, which includes the Main and Botos craters. The composition of the rocks spans the range from basalts to dacites. These units were geochemically correlated with two magmatic components: 1. The Sabana Redonda Geochemical Component (TiO 2 > 1%) enriched in HSFE and other trace elements, present in La Paz Andesites, Lavas Río Cuarto, Poasito, Sabana Redonda, Poás Lapilli Tuff and some from Botos crater lavas. 2. The Von Frantzius Geochemical Component (TiO 2 < 0.8 %) is present in lavas of the Main crater, Von Frantzius, Achiote, Bosque Alegre, Cerro Congo and some Botos crater lavas. During the last 600 ka the content of K 2 O and other oxides (TiO 2 and P 2 O 5 ) and traces (Zr, Ba) have varied significantly through time, suggesting the presence of these two geochemical end-members since the beginning of the magmatic activity of Poás. Within similar ranges of time, units with high and low values of these elements have coexisted; the latter is true for Botos lavas RUIZ,

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Flux versus decompression melting at stratovolcanoes in southeastern Guatemala

Cited by 99 publications

References 93 publications

Geochemistry of Sarmatian volcanic rocks in the Tokaj Mts (NE Hungary) and their relationship to hydrothermal mineralization

Geochemistry of Sarmatian volcanic rocks in the Tokaj Mts (NE Hungary) and their relationship to hydrothermal mineralization

U-Pb geochronology, Sr-Nd geochemistry, petrogenesis and tectonic setting of Gandab volcanic rocks, northeastern Iran

Caracterización geoquímica y petrográfica de las unidades geológicas del macizo del volcán Poás, Costa Rica

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