Ultramafic and mafic xenoliths from Hierro, Canary Islands: evidence for melt infiltration in the upper mantle

Neumann, Else-Ragnhild

doi:10.1007/bf00306436

Cited by 61 publications

(13 citation statements)

References 46 publications

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“…CaO contents (0.21−0.33 wt%) are lower than those in olivine phenocrysts from Miocene subaerial shield basalts on Gran Canaria (Fig. 3A, B; Table 3; Appendix Tables 1-3), but higher than in olivines from mantle xenoliths of the Cr-diopside series xenoliths on Hierro and the spinel-harzburgite suite xenoliths on Lanzarote (Canary Islands; Neumann, 1991;Neumann et al, 1995), as well as in olivines from mantle xenoliths in general (<0.15 wt% CaO; Hervig et al, 1986;Fig. 3B).…”

Section: Mineral Chemistry Olivinementioning

confidence: 83%

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Melt, crystal, and fluid inclusions in olivine and clinopyroxene phenocrysts from the submarine shield stage hyaloclastites of Gran Canaria, Sites 953 and 956

Gurenko¹,

Hansteen²,

Schmincke³

1998

Proceedings of the Ocean Drilling Program, 157 Scientific Results

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Miocene submarine basaltic hyaloclastites, lapillistones, and breccias drilled at Sites 953 and 956 contain relicts of olivine and fresh clinopyroxene phenocrysts with abundant primary melt, fluid, and crystal inclusions. Primary melt inclusions are represented by glassy (quenched glass ± gas bubble/s) and multiphase (glass + daughter crystals ± gas bubble/s) types. Fluid inclusions are composed of gas and liquid phases and are nearly pure CO 2 in composition, as shown by low-temperature microthermometric studies. Melt and crystal inclusions and their host minerals were analyzed for major elements by electron microprobe and large (>60 µm in size) representative melt inclusions by ion microprobe for trace elements and Because shallow level magma crystallization is unlikely to significantly change trace element ratios in the melt, we think that the observed discrepancy in (La/ Sm) n and (Sm/Yb) n ratios, and high (Zr/Y) n ratios resulted from the melting of a garnet-bearing mantle source.Calculated parental magmas equilibrated with Fo 90 represent a range from transitional to tholeiitic compositions (46.7−52.0 wt% SiO 2 ) and are similar to olivine basalt-picrite (11.2−18.0 wt% MgO). They crystallized over the range of temperatures from 1450° to 1120°C and pressures from <0.5 to 8 kbar. Oxygen fugacity varied from the conditions corresponding to FMQ-1 or WM-1 buffers during the early crystallization stage of parental magmas, to late-stage conditions of FMQ -NNO+1. Crystallization of magmas occurred in the presence of fluid of essentially CO 2 composition.

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Section: Mineral Chemistry Olivinementioning

confidence: 83%

“…data), compositions of olivine from Site 953 are from Schmincke and Segscheider (Chap. 12,this volume), and olivine from Hierro and Lanzarote xenoliths are after Neumann (1991) and Neumann et al (1995). Table 3; Appendix Tables 1-3).…”

Section: Mineral Chemistry Olivinementioning

confidence: 99%

Melt, crystal, and fluid inclusions in olivine and clinopyroxene phenocrysts from the submarine shield stage hyaloclastites of Gran Canaria, Sites 953 and 956

Gurenko¹,

Hansteen²,

Schmincke³

1998

Proceedings of the Ocean Drilling Program, 157 Scientific Results

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“…However, Hoernle andSchmincke (1993a, 1993b) found trace element evidence for the presence of phlogopite in the mantle source. A likely scenario would be that the lithospheric mantle beneath Gran Canaria was impregnated with reaction products of deep-seated basaltic magmas prior to the shield-stage volcanism, similar to what has been inferred for several Canary Islands (on the basis of mantle xenolith studies; Neumann, 1991;Hansteen et al, 1991;Neumann et al, 1995). Partial melting of a mantle source metasomatized or enriched in basaltic components, which may contain variable amounts of phlogopite and sulfides ± amphibole, could possibly explain the scatter in F and probably, to some extent, S and Cl contents in the glass inclusions.…”

Section: Compositional Variations In the Parental Magmasmentioning

confidence: 72%

Sulfur, chlorine, and fluorine in glass inclusions in olivine and clinopyroxene from basaltic hyaloclastites representing the Gran Canaria shield stage at Sites 953 and 956

Hansteen¹,

Gurenko²

1998

Proceedings of the Ocean Drilling Program, 157 Scientific Results

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Sulfur, chlorine, and fluorine concentrations of primary silicate glass inclusions in olivine and clinopyroxene from basaltic hyaloclastites representing the Gran Canaria shield stage at Sites 953 and 956 were investigated using an electron microprobe. Inclusion compositions corrected for post-entrapment, host-mineral crystallization range from 46.3 to 54.4 wt% SiO 2 , and from 5.7 to 10.3 wt% MgO. Significant spread in S and Cl values (200-2390 ppm S, and 120-870 ppm Cl) and the lack of correlation between S and Cl with MgO and P suggest partial degassing of the magmas prior to eruption. F was not degassed during magma evolution and thus can be used to discuss magma source compositions. The lack of correlation between SiO 2 and F in the calculated parental magmas suggests that pressure is not likely to have exerted the main control on volatile contents. A source with heterogeneous F contents is inferred. The occurrence of S 2− , as the only detectable S species in the glass inclusions, suggests crystallization conditions with fO 2 levels at or below the Ni-NiO (NNO) buffer.

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“…Late Quaternary eruptions along the threearmed rift zone system are characterized by alkali picrites, basanites and tephrites. Mafic and ultramafic xenoliths from Hierro have been interpreted to reflect metasomatism of lithospheric mantle by young basaltic magmas (Hansteen et al 1991;Neumann 1991;Whitehouse and Neumann 1995;Wulff-Pedersen et al 1996;Neumann and Wulff-Pedersen 1997).…”

Section: El Hierromentioning

confidence: 99%

Composition and evolution of submarine volcanic rocks from the central and western Canary Islands

Abratis¹,

Schmincke

Hansteen

2002

Int J Earth Sci (Geol Rundsch)

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Submarine volcanic rocks dredged during RV Meteor cruise M43-1 comprise alkali basalts, basanites, nephelinites and their differentiates representing both basement-shield and young post-shield volcanics of Gran Canaria, Tenerife, La Palma and El Hierro. The primitive lavas vary widely in trace element composition (e.g., Zr/Y=6.6-11.7, (La/Sm) N =2.3-5.4, and Ba/Yb=71-311), and they are characterized by steep, rare-earth element patterns with mean (La/Yb) N =16, and by pronounced, positive primitive mantle-normalized Nb and Ta and negative K anomalies similar to HIMU-type basalts. Rocks from the submarine flanks west and north of Gran Canaria are isotopically and geochemically identical to rocks of the subaerial Miocene shield stage, but they are distinct from rocks of the post-shield stages (Zr/Nb=6.3-8.9,

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Ultramafic and mafic xenoliths from Hierro, Canary Islands: evidence for melt infiltration in the upper mantle

Cited by 61 publications

References 46 publications

Melt, crystal, and fluid inclusions in olivine and clinopyroxene phenocrysts from the submarine shield stage hyaloclastites of Gran Canaria, Sites 953 and 956

Melt, crystal, and fluid inclusions in olivine and clinopyroxene phenocrysts from the submarine shield stage hyaloclastites of Gran Canaria, Sites 953 and 956

Sulfur, chlorine, and fluorine in glass inclusions in olivine and clinopyroxene from basaltic hyaloclastites representing the Gran Canaria shield stage at Sites 953 and 956

Composition and evolution of submarine volcanic rocks from the central and western Canary Islands

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