Geochemistry of oceanic carbonatites compared with continental carbonatites: mantle recycling of oceanic crustal carbonate

Hoernle, Kaj; Tilton, G. R.; Bas, Mike J. Le; Duggen, Svend; Garbe‐Schönberg, Dieter

doi:10.1007/s004100100308

Cited by 397 publications

(225 citation statements)

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“…Rock dating (Hoernle et al, 2002;Madeira et al, 2010) and the juvenile aspect of several craters (Day, 2009; et al., 2010;Madeira et al, 2010) suggest that the most recent eruptive activity of Brava is Holocene in age. Volcanic hazards are mainly associated with phreatomagmatic eruptions, surge and pyroclastic deposits, and to a lesser extent with lava flows (Machado et al, 1968;Day, 2009;Madeira et al, 2010).…”

Section: Bravamentioning

confidence: 99%

Investigating volcanic hazard in Cape Verde Islands through geophysical monitoring: network description and first results

Faria¹,

Fonseca²

2014

Nat. Hazards Earth Syst. Sci.

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Abstract. We describe a new geophysical network deployed in the Cape Verde Archipelago for the assessment and monitoring of volcanic hazards as well as the first results from the network. Across the archipelago, the ages of volcanic activity range from ca. 20 Ma to present. In general, older islands are in the east and younger ones are in the west, but there is no clear age progression of eruptive activity as widely separated islands have erupted contemporaneously on geological timescales. The overall magmatic rate is low, and there are indications that eruptive activity is episodic, with intervals between episodes of intense activity ranging from 1 to 4 Ma. Although only Fogo Island has experienced eruptions (mainly effusive) in the historic period (last 550 yr), Brava and Santo Antão have experienced numerous geologically recent eruptions, including violent explosive eruptions, and show felt seismic activity and geothermal activity. Evidence for recent volcanism in the other islands is more limited and the emphasis has therefore been on monitoring of the three critical islands of Fogo, Brava and Santo Antão, where volcanic hazard levels are highest. Geophysical monitoring of all three islands is now in operation. The first results show that on Fogo, the seismic activity is dominated by hydrothermal events and volcano-tectonic events that may be related to settling of the edifice after the 1995 eruption; in Brava by volcano-tectonic events (mostly offshore), and in Santo Antão by volcano-tectonic events, medium-frequency events and harmonic tremor. Both in Brava and in Santo Antão, the recorded seismicity indicates that relatively shallow magmatic systems are present and causing deformation of the edifices that may include episodes of dike intrusion.

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Section: Bravamentioning

confidence: 99%

Investigating volcanic hazard in Cape Verde Islands through geophysical monitoring: network description and first results

Faria¹,

Fonseca²

2014

Nat. Hazards Earth Syst. Sci.

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“…Therefore, in most models for the origin of the EM-type components, they are ultimately related to/derived from the continental lithosphere, whether this be in the form of crustal splinters beneath the islands/seamounts or recycled subcontinental lithospheric mantle incorporated in the upper mantle beneath the volcanic structures closest to the continents, i.e. within lithospheric mantle, uppermost asthenosphere directly beneath the lithosphere and/or deeper portions of the upper mantle, where it can be entrained by rising plumes (e.g., Gerlach et al, 1988;Hoernle et al, , 1995Hoernle et al, , 2002Widom et al, 1999;Geldmacher and Hoernle, 2000;Lundstrom et al, 2003;Doucelance et al, 2003;Escrig et al, 2005;Geldmacher et al, 2005). Recently, Geldmacher et al (2008) have confirmed a shallow origin for at least some of the EM-type components in the northern Atlantic and provide evidence for the origin of EM-type mantle through recycling of subcontinental lithosphere globally.…”

Section: Introductionmentioning

confidence: 99%

Enriched, HIMU-type peridotite and depleted recycled pyroxenite in the Canary plume: A mixed-up mantle

Gurenko

Sobolev

Hoernle

et al. 2009

Earth and Planetary Science Letters

111

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Components:abstract -280 words; 1,834 characters with spaces; main text -6,330 words; 41,109 characters with spaces; 5 figures, 2 tables; list of references includes 60 citations. * Corresponding author and present address:Andrey Gurenko, Woods Hole Oceanographic Institution, Clark 114, MS#23, Woods Hole, MA 02543, USA; Phone: +1 508 289-2405, Fax: +1 508-457-2175; E-mail: agurenko@whoi.edu 2 Abstract − The Earth's mantle is chemically and isotopically heterogeneous, and a component of recycled oceanic crust is generally suspected in the convecting mantle Mantle plumes from ancient oceanic crust. Earth Planet. Sci. Lett. 57,[421][422][423][424][425][426][427][428][429][430][431][432][433][434][435][436]. Indeed, the HIMU component (high μ = 238 U/ 204 Pb), one of four isotopically distinct end-members in the Earth's mantle, is generally attributed to relatively old (≥1-2 Ga) recycled oceanic crust in the form of eclogite/pyroxenite, e.g. [Zindler and Hart, 1986. Chemical geodynamics. Ann. Rev. Earth Planet.Sci. 14, 493-571]. Although the presence of the recycled component is generally supported by element and isotopic data, little is known about its physical state at mantle depths. Here we show that the concentrations of Ni, Mn and Ca in olivine from the Canarian shield stage lavas, which can be used to asses the physical nature of the source material (peridotite versus olivine-free pyroxenite) [Sobolev et al., 2007. The amount of recycled crust in sources of mantle-derived melts. Science 316, 412-417], correlate strongly with bulk rock Sr, Nd and Pb isotopic ratios. The most important result following from our data is that the enriched, HIMU-type (having higher 206 Pb/ 204 Pb than generally found in the other mantle endmembers) signature of the Canarian hotspot magmas was not caused by a pyroxenite/eclogite constituent of the plume but appears to have been primarily hosted by peridotite. This implies that the old (older than ~1 Ga) ocean crust, which has more evolved radiogenic isotope compositions, was stirred into/reacted with the mantle so that there is not significant eclogite left, whereas younger recycled oceanic crust with depleted MORB isotopic signature (<1 Ga) can be preserved as eclogite, which when melted can generate reaction pyroxenite.

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“…Numerous previous studies have advocated for a direct link between carbonatite melt generation and mantle plumes [74,78,82,83]. As pointed out by Rukhlov and Bell [9], the presence of carbonatites may mark the initiation of mantle-generated magmatism because of the very fluid nature of carbonatitic melts, and the fact that they are produced by low degrees of partial melting (i.e., precursors to basaltic activity, and perhaps are associated with changes in mantle dynamics).…”

Section: Relationship Between Oka Monteregian Igneous Province (Mip)mentioning

confidence: 99%

Evidence for the Multi-Stage Petrogenetic History of the Oka Carbonatite Complex (Québec, Canada) as Recorded by Perovskite and Apatite

Chen¹,

Simonetti²

2014

Minerals

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Abstract:The Oka complex is amongst the youngest carbonatite occurrences in North America and is associated with the Monteregian Igneous Province (MIP; Québec, Canada). The complex consists of both carbonatite and undersaturated silicate rocks (e.g., ijolite, alnöite), and their relative emplacement history is uncertain. The aim of this study is to decipher the petrogenetic history of Oka via the compositional, isotopic and geochronological investigation of accessory minerals, perovskite and apatite, using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The new compositional data for individual perovskite and apatite grains from both carbonatite and associated alkaline silicate rocks are highly variable and indicative of open system behavior. In situ Sr and Nd isotopic compositions for these two minerals are also variable and support the involvement of several mantle sources. U-Pb ages for both perovskite and apatite define a bimodal distribution, and range between 113 and 135 Ma, which overlaps the range of ages reported previously for Oka and the entire MIP. The overall distribution of ages indicates that alnöite was intruded first, followed by okaite and carbonatite, whereas ijolite defines a bimodal emplacement history. The combined chemical, isotopic, and geochronological data is best explained by invoking the periodic generation of small volume, partial melts generated from heterogeneous mantle.

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Geochemistry of oceanic carbonatites compared with continental carbonatites: mantle recycling of oceanic crustal carbonate

Cited by 397 publications

References 0 publications

Investigating volcanic hazard in Cape Verde Islands through geophysical monitoring: network description and first results

Investigating volcanic hazard in Cape Verde Islands through geophysical monitoring: network description and first results

Enriched, HIMU-type peridotite and depleted recycled pyroxenite in the Canary plume: A mixed-up mantle

Evidence for the Multi-Stage Petrogenetic History of the Oka Carbonatite Complex (Québec, Canada) as Recorded by Perovskite and Apatite

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