himu-em: The French Polynesian connection

Chauvel, Catherine; Hofmann, Albrecht W.; Vidal, Philippe

doi:10.1016/0012-821x(92)90042-t

Cited by 610 publications

(358 citation statements)

References 60 publications

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“…Thus, it seems reasonable to hypothesise that the more mafic magmas of the complexes were produced by direct partial melting of very highly enriched mantle. In detail, our data suggest that the mantle sources for the more mafic rocks in the suite vary in their degree of enrichment, from ordinary enriched mantle, similar to EM1 and EM2 (Zindler and Hart, 1986;Chauvel et al, 1992), to more heavily metasomatised mantle with evolved crust-like Sr isotope signatures. We suggest that this enrichment and metasomatism is most likely to have been brought about through reactions between the mantle wedge and fluids emanating from an oceanic slab during the subduction associated with the closure of the Iapetus (which began in the Ordovician).…”

Section: Origin Of the Crustal Component In The Mafic To Intermediatementioning

confidence: 79%

“…Points for enriched mantle EM1 and EM2 melts (Zindler and Hart, 1986;Chauvel et al, 1992) are also plotted, along with a point for a magnesian Greenland alkali basalt (GAB; Larsen et al, 2003). The significance of these points is discussed in the text, along with the inferred trends (labelled 'a' to 'e').…”

Section: Discussionmentioning

confidence: 99%

“…Menzies and Halliday (1988) summarised the data from the mostly mafic, granulite-facies, meta-igneous xenoliths found in Scottish Tertiary basalts. These xenoliths have Sr and Nd isotope characteristics that suggest that the subcontinental mantle beneath this part of Scotland has characteristics similar to the enriched mantle reservoirs EM1 and EM2, as well as even more enriched rock types (Zindler and Hart, 1986;Chauvel et al, 1992). …”

Section: Potential Magma Sources In the Crust And Mantlementioning

confidence: 95%

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Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Clemens

Darbyshire

Flinders

2009

Lithos

109

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The 425 Ma Arrochar and Garabal Hill-Glen Fyne complexes of highland Scotland are examples of post-orogenic magmatism accompanying extensional collapse of an orogen, in this case the Caledonian. The rocks are dominantly high-K series, but range from medium-K to shoshonitic. Mantle upwelling, melting and the intrusion of large volumes of mafic magma into the crust are inferred to have accompanied lithospheric thinning, and to have provided the heat source for melting of young arc crust accreted during the preceding subduction epoch.Fluids evolved from the subducting slab are inferred to have caused high degrees of enrichment in the overlying mantle wedge. Deep in the crust, the mantle-derived, K-rich mafic to intermediate magmas mixed with felsic crustal melts to form the spectrum of magmas intruded in the two complexes. Microgranular enclaves in the granitic rocks represent mafic magmas derived from the enriched mantle and hybridised by reaction, diffusion and mechanical mixing with their host felsic magmas, but they do not form part of the evolutionary series that produced the host magmas. Rather than inheriting its LILEenriched character directly from crustal melts, or from crustal assimilation by mafic magmas, the high-K series may commonly owe at least part of its potassic character to the involvement of mantle (highly metasomatised by slab-derived fluids) as a major magma source. Enclave suites, though prominent in some granitic rocks should not be assumed to represent magmas that played a significant role in the production of the chemical variations in their host magmas.

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Section: Origin Of the Crustal Component In The Mafic To Intermediatementioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Potential Magma Sources In the Crust And Mantlementioning

confidence: 95%

See 1 more Smart Citation

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Clemens

Darbyshire

Flinders

2009

Lithos

109

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“…1). While HIMU basalts can have positive Nb and Ta anomalies (Weaver et al, 1987;Weaver et al, 1991;Chauvel et al, 1992), they generally have lower anomalies than high 3 He/ 4 He lavas, and can even have negative Nb anomalies (Sun and McDonough, 1989). Importantly, HIMU lavas exhibit flat or negative Ti-anomalies , and thus lack the positive Ti-anomalies observed in high 3 (Hauri et al, 1996) similar to DMM (Standish et al, 2002) (Fig.…”

Section: New Data and Observationsmentioning

confidence: 91%

Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity

Jackson¹

2008

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AcknowledgementsFirst off, I want to thank my advisor, Stan Hart, for being so generous, with his time, his resources, and his thoughts. Stan sent me to the edges of the earth to collect rocks on islands and by sea ("a happy student is a traveling student"). And the fishing trips didn't end when I got back to the lab. When I went to him for answers, I often just ended up with more questions, we'd dream up a dozen projects, and he'd send me off with more projects and questions (back in my office, I'd realize that the meeting didn't go as I'd planned)! But the questions were more important than the answers: the questions will keep me employed after I graduate! It's only now that I'm realizing that without so much independence to explore (though frightening at times), I may have never understood that I was capable of generating some fun ideas! I can't express my gratitude to Nobu Shimizu and Mark Kurz for their "open door" policy. They are always ready to give me time, sit down, and hash out new ideas. Their offices are idea factories. I don't know how I would have written this thesis without their constant input.My deepest appreciation to J. Collins for sweating it out with me in the field in Samoa, and to the rest of my committee, P. Kelemen, Erik Hauri and Fred Frey for their stimulating input and for traveling so far to attend the general exam, thesis defense, and committee meetings.J. Blusztajn has always been so optimistic and helpful, and has given me so much of his time and advice. J. Curtice and T. Atwood have also given me dollops of help, and without them I could not have accomplished much of the thesis work.I am so thankful for the friendship of my dear friends, S. Hoffmann, D. Stuebe and J. Blythe, Heidi Marcella, Carolyn Walker, Lauge Sokol-Hessner and Hannah Cole. They kept me going when the times were rough, and we shared many of the best times as well.I am also thankful for the friendship and advice that I received from the "old guard" of JP students, who left the WHOI "nest" before me.

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“…basalts from the Tristan da Cuhna, Gough, Samoan and Society islands (Willbold and Stracke 2006). The HIMU reservoir is similarly estimated from inverse modelling using the compositions of basalts from Tubuai, Mangaia and Rurutu (Chauvel et al 1992). The composition of PM is derived from studies of chondritic meteorites and refractory element ratios of mantle peridotites (McDonough and Sun 1995).…”

Section: Primary Magmas and Mantle Sourcementioning

confidence: 99%

The geochemistry and petrogenesis of the Paleoproterozoic du Chef dyke swarm, Québec, Canada

Ciborowski

Kerr

McDonald

et al. 2014

Precambrian Research

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himu-em: The French Polynesian connection

Cited by 610 publications

References 60 publications

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Sources of post-orogenic calcalkaline magmas: The Arrochar and Garabal Hill–Glen Fyne complexes, Scotland

Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity

The geochemistry and petrogenesis of the Paleoproterozoic du Chef dyke swarm, Québec, Canada

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