Behaviour of high field strength elements in subduction zones: constraints from Kamchatka–Aleutian arc lavas

Münker, Carsten; Wörner, Gerhard; Yogodzinski, G. M.; Churikova, Tatiana

doi:10.1016/j.epsl.2004.05.030

Cited by 313 publications

(173 citation statements)

References 83 publications

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“…CKD melts are enriched in Nb/Yb compared to EVF due to smaller melting degree, but depleted compared to SR melt inclusions. Strong Nb enrichment in SR has been attributed to the involvement of an OIB component in the melting region Münker et al 2004). Nb is known as a conservative element with respect to fluids.…”

Section: Subducted Hawaiian Seamount Chain As Fluid Source In the Arcmentioning

confidence: 99%

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Volatile (S, Cl and F) and fluid mobile trace element compositions in melt inclusions: implications for variable fluid sources across the Kamchatka arc

Churikova

Wörner²,

Mironov

et al. 2007

Contrib Mineral Petrol

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Volatile element, major and trace element compositions were measured in glass inclusions in olivine from samples across the Kamchatka arc. Glasses were analyzed in reheated melt inclusions by electron microprobe for major elements, S and Cl, trace elements and F were determined by SIMS. Volatile element-trace element ratios correlated with fluid-mobile elements (B, Li) suggesting successive changes and three distinct fluid compositions with increasing slab depth. The Eastern Volcanic arc Front (EVF) was dominated by fluid highly enriched in B, Cl and chalcophile elements and also LILE (U, Th, Ba, Pb), F, S and LREE (La, Ce). This arc-front fluid contributed less to magmas from the central volcanic zone and was not involved in back arc magmatism. The Central Kamchatka Depression (CKD) was dominated by a second fluid enriched in S and U, showing the highest S/K 2 O and U/Th ratios. Additionally this fluid was unusually enriched in 87 Sr and 18 O. In the back arc Sredinny Ridge (SR) a third fluid was observed, highly enriched in F, Li, and Be as well as LILE and LREE. We argue from the decoupling of B and Li that dehydration of different water-rich minerals at different depths explains the presence of different fluids across the Kamchatka arc. In the arc front, fluids were derived from amphibole and serpentine dehydration and probably were water-rich, low in silica and high in B, LILE, sulfur and chlorine. Large amounts of water produced high degrees of melting below the EVF and CKD. Fluids below the CKD were released at a depth between 100 and 200 km due to dehydration of lawsonite and phengite and probably were poorer in water and richer in silica. Fluids released at high pressure conditions below the back arc (SR) probably were much denser and dissolved significant amounts of silicate minerals, and potentially carried high amounts of LILE and HFSE.

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Section: Subducted Hawaiian Seamount Chain As Fluid Source In the Arcmentioning

confidence: 99%

“…HFSE and Hf isotope systematics (Münker et al 2004) show that EVF and CKD magmas formed from a depleted mantle source with low Ta/Yb ratios. By contrast, lavas from the SR back arc have a significant contribution of a source relatively rich in HFSE (higher Ta/Yb, low Zr/ Nb and Ba/Nb ratios).…”

Section: Other Active Volcanoesmentioning

confidence: 99%

Volatile (S, Cl and F) and fluid mobile trace element compositions in melt inclusions: implications for variable fluid sources across the Kamchatka arc

Churikova

Wörner²,

Mironov

et al. 2007

Contrib Mineral Petrol

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“…The depleted Nb (1.94-5.80 ppm) contents in the basaltic rocks suggest the absence of Nb-enriched basalts in the Qiaoxiahala deposit, suggesting that melts derived from subducted oceanic crust have not been erupted in the arc (Hollings and Kerrich, 2000;Wyman et al, 2000). Moreover, the enrichment of LILEs and LREEs over HFSEs and HREEs indicate subduction-related metasomatism by the LILEs-and LREEs-bearing slab fluids (Schiano et al, 1995;Münker et al, 2004). On the (Ta/La) PM vs. (Hf/Sm) PM diagram all the basaltic rocks fall in the hydrated mantle source field, consistent with the influence of subduction-related fluids rather than slab melts ( Fig.…”

Section: Basaltic Rocksmentioning

confidence: 99%

The Paleozoic tectonic evolution and metallogenesis of the northern margin of East Junggar, Central Asia Orogenic Belt: Geochronological and geochemical constraints from igneous rocks of the Qiaoxiahala Fe-Cu deposit

Liang

Chen

Hollings

et al. 2016

Journal of Asian Earth Sciences

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“…However, slight enrichment in LILE and decrease in negative Nb, Ta and Ti anomalied can be interpreted to the some contribution of asthenospheric melts (OIB), compared to typical of subductionrelated magma (Figure 9(a) and (b)). The LILE and LREE enrichment of volcanic rocks (Figure 9) indicates that parental magma can derive from a source area (probably lithospheric mantle) that is enriched (exposed to metasomatism) by fluids emerging from the subducted slab and/or sediments (Münker, Wörner, Yogodzinski, & Churikova, 2004). In chondrite-normalised REE diagrams, the HREE values of Hamsilos volcanites exhibit an almost-horizontal trend.…”

Section: Source Characteristicsmentioning

confidence: 99%

Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications

Aydınçakır

2016

Geodinamica Acta

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Mineral chemistry, major and trace elements, 40 Ar/ 39 Ar age and Sr-Nd-Pb isotopic data are presented for the Late Cretaceous Hamsilos volcanic rocks in the Central Pontides, Turkey. The Hamsilos volcanic rocks mainly consist of basalt, andesite and associated pyroclastics (volcanic breccia, vitric tuff and crystal tuff). They display shoshonitic and high-K calc-alkaline affinities. The shoshonitic rocks contain plagioclase, clinopyroxene, alkali feldspar, phlogopite, analcime, sanidine, olivine, apatite and titanomagnetite, whereas the high-K calc-alkaline rocks contain plagioclase, clinopyroxene, orthopyroxene, magnetite / titanomagnetite in microgranular porphyritic, hyalo-microlitic porphyritic and glomeroporphyritic matrix. Mineral chemistry data reveal that the pressure condition of the clinopyroxene crystallisation for the shoshonitic rocks are between 1.4 and 6.3 kbar corresponds to 6-18-km depth and the high-K calc-alkaline rocks are between 5 and 12 km. 40 Ar/ 39 Ar age data changing between 72 ± .5 Ma and 79.0 ± .3 Ma (Campanian) were determined for the Late Cretaceous Hamsilos volcanic rocks, contemporaneous with the subduction of the Neo-Tethyan Ocean beneath the Pontides. The studied volcanic rocks were enriched in the large-ion lithophile and light rare earth element contents, with pronounced depletion in the contents of high-field-strength elements. Chondrite-normalised rare earth element patterns (La N /Lu N = 6-17) show low to medium enrichment, indicating similar sources of the rock suite. Pb/ 204 Pb values between 37.839 and 38.427. The main solidification processes involved in the evolution of the volcanic rocks consist of fractional crystallisation, with minor amounts of crustal contamination ± magma mixing. According to geochemical evidence, the shoshonitic melts in the Hamsilos volcanic rocks were possibly derived from the low degree of partial melting of a subcontinental lithospheric mantle (SCLM), while the high-K calc-alkaline melts were derived from relatively high degree of partial melting of SCLM that was enriched by fluids and/or sediments from a subduction of oceanic crust.

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Behaviour of high field strength elements in subduction zones: constraints from Kamchatka–Aleutian arc lavas

Cited by 313 publications

References 83 publications

Volatile (S, Cl and F) and fluid mobile trace element compositions in melt inclusions: implications for variable fluid sources across the Kamchatka arc

Volatile (S, Cl and F) and fluid mobile trace element compositions in melt inclusions: implications for variable fluid sources across the Kamchatka arc

The Paleozoic tectonic evolution and metallogenesis of the northern margin of East Junggar, Central Asia Orogenic Belt: Geochronological and geochemical constraints from igneous rocks of the Qiaoxiahala Fe-Cu deposit

Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications

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