Meimechites: highly magnesian lithosphere-contaminated alkaline magmas from deep subcontinental mantle

Arndt, Nicholas; Lehnert, Kerstin; Vasil’ev, Yu. R.

doi:10.1016/0024-4937(95)90009-8

Cited by 85 publications

(36 citation statements)

References 29 publications

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“…[32], Singgalo type of Ontong Java [8], and Hawaiian tholeiitic and alkali basalts [3]. [28], Ontong Java [43], Kerguelen [27], Caribbean [31], Parana-Etendeka [10], Mino-Tamba [15,16], Siberia [1], and Pechenga [12,13]…”

Section: Resultsmentioning

confidence: 99%

Discovery of Ferropicrites and High-Magnesian Andesites From the Erdenetsogt Formation, Central Mongolia

Ganbat

Ishiwatari

Orolmaa

et al. 2016

Proc. Mong. Acad. Sci.

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Section: Resultsmentioning

confidence: 99%

Discovery of Ferropicrites and High-Magnesian Andesites From the Erdenetsogt Formation, Central Mongolia

Ganbat

Ishiwatari

Orolmaa

et al. 2016

Proc. Mong. Acad. Sci.

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“…Two large discovered diamond crystals (which are fragments of a larger crystal (Surkov et al, 2008)) measured 1.35 mm (Figure 23) and 1.20 mm. Identified sample of meimechite rock, chemical composition of which is very similar to kimberlite associations (e.g., Arndt et al, 1995), is shown in Figure 24 In the western part of the Makhtesh Ramon Canyon exposed volcanic and volcanic-fragmentary rocks were studied. These outcrops represent hills with the height up to 150 m, and are, from the geological point of view, relics of volcanic flows (Bentor, 1952), for which often is typical columnar (prismatic) individuality.…”

Section: Figure 20 Valley Of Temporary Channel ("Wadi") Nahal-ramonmentioning

confidence: 99%

Makhtesh Ramon Complex Deposit (Southern Israel) – A Window to the Upper Mantle

2017

International Journal of Mining Science

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An integrated analysis of several regional geological and geophysical factors allowed to select theMakhtesh Ramon area (northern Negev, Israel) feldspars, pyroxenes, magnetite, hematite, ilmenite, galenite, pyrite, limonite, mica, chromite, leucoxene, zircon, rutile, etc olivine, anatase and tourmaline (including black samples). These minerals do not rolled and oxidized that is an additional evidence of the neighboring occurrence of the indigenous rocks. Data of electronic microscopy show that the grains of (1) picroilmenite and (2) pyrope contain, respectively: (1) cobalt, chrome, magnesium and nickel and (2) chrome, magnesium and aluminum. This indicates that both picroilmenite and pyrope have the hyper-abyssal origin that also is an indicator of the possible occurring of diamondiferous pipes. List of secondary-importance satellite minerals includes

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“…(Norman and Garcia, 1999), Ontong Java (Tejada et al, 2002), Shatsky Rise (Sano et al, 2012), Kerguelen , Caribbean (Kerr et al, 1996;Révillon et al, 1999), Parana -Etendeka (Gibson et al, 2000), Mino -Tamba (Ichiyama et al, 2006(Ichiyama et al, , 2008, Siberia (Arndt et al, 1995), and Pechenga (Hanski and Smolkin, 1989;Hanski, 1992). Rock abbreviations: Th, tholeiites; Fb, ferrobasalts; P, picrites and Fp, ferropicrites.…”

Section: Mineral Chemistrymentioning

confidence: 99%

Middle Paleozoic greenstones of the Hangay region, central Mongolia: Remnants of an accreted oceanic plateau and forearc magmatism

Erdenesaihan

Ishiwatari

Orolmaa

et al. 2013

Journal of Mineralogical and Petrological Sciences

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The Hangay -Hentey belt in Central Mongolia constitutes a Pacific -type accretionary orogen that formed through the evolution and closure of the Hangay -Hentey paleo -ocean during the Early Paleozoic to Early Mesozoic. From this belt, new geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dikes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) enriched, plume -derived tholeiitic greenstones including picrites and ferrobasalts with oceanic plateau basalt affinity, (2) non -enriched, plume -derived tholeiitic basalts with E -MORB affinity, and (3) arc -derived high -Mg andesites (HMAs). The plume -derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12 -22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Their tholeiitic composition and high -Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe -and Ti -rich basaltic material. The non -enriched basalts may have been generated by a higher degree of melting of the same source mantle. The HMAs are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite of the Setouchi volcanic belt, SW Japan. We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep -water region of the Hangay -Hentey paleo -ocean in the Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back -stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.

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Meimechites: highly magnesian lithosphere-contaminated alkaline magmas from deep subcontinental mantle

Cited by 85 publications

References 29 publications

Discovery of Ferropicrites and High-Magnesian Andesites From the Erdenetsogt Formation, Central Mongolia

Discovery of Ferropicrites and High-Magnesian Andesites From the Erdenetsogt Formation, Central Mongolia

Makhtesh Ramon Complex Deposit (Southern Israel) – A Window to the Upper Mantle

Middle Paleozoic greenstones of the Hangay region, central Mongolia: Remnants of an accreted oceanic plateau and forearc magmatism

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