 | | Journal (article/letter/editorial) | | Bir102, Ali, Yemen 137 LETTER Clinopyroxene-rich lherzolite xenoliths from Bir Ali, Yemen possible...possible product of peridotite/melt reactions Murad ALI and Shoji ARAI Department of Earth Sciences, Kanazawa...− Quaternary basalts from Bir Ali, the Shabwa Governorate, southern Yemen, were studied to examine upper...ratios (> 1), which are characteristic of the Bir Ali xenolith suite, contain lower Fo contents of olivine... Metasomatism, Rifted continental margins, Bir Ali, Yemen INTRODUCTION Major mantle processes such as |  | | Journal (article/letter/editorial) | | sub-lithospheric magma na reservoirs. Magmas in Afar and Yemen largely have geochemical characteristics consistent...relationship between rift evolution and magmatism. In Yemen, magmatic activity is limited to the regional Mid...of the East African Rift, preserved in Afar and Yemen, is referenced in many introductory text books as...contribution I explore the magmatic history of Afar (and Yemen), its relationship to the broad tectonic events...the stratigraphic record in Afar and neighboring Yemen in order to constrain the temporal evolution of |  | | Journal (article/letter/editorial) | | e., amphibole-bearing) spinel lherzolites from Yemen, as well as from hydrous spinel lherzolites and...INTRODUCTION lherzolite xenoliths from Ataq and Bir-Ali in Yemen and from Nunivak Island, Alaska. We will show...and 13008 are large amphibole megacrysts. 2.2. Yemen Samples Oceanic rifting in the Gulf of Aden began...Plio-Quaternaryvolcanic fields on the south coast of Yemen: Bir All and Ataq. At Bir All, the xenoliths are anhydrous spinel...G. Chazot et al. spinels are surrounded by plagioclase, indicating upwelling of the upper mantle during |  | | Journal (article/letter/editorial) | | 159-179 Silicate glasses in spine1 lherzolites from Yemen: origin and chemical composition Gilles Chazot a’*...lherzolites found in alkali basalts from Southern Yemen contain melt-pockets with silicate glasses from...mantle conditions. Comparison of the glasses in the Yemen lherzolites with published chemical compositions...Mantle xenoliths from the Ataq and Bir Ali volcanic fields of Southern Yemen contain such quenched glasses...Mantle xenoliths in Yemen have been collected in two different Quaternary volcanoes, Bir Ali on the southern |  | | Report (issue) | | Volcanic rifted margins also characterize Ethiopia-Yemen, India-Australia, and Africa-Madagascar. The transition...the betterknown volcanic rifted margins, Ethiopia-Yemen, the Atlantic margins, and the Australia-India conjugate...volcanism to synrift domino fault-block terranes (Yemen) and subaerial seaward-dipping re×ector series (Ethiopia)...volcanic rifted margin based on data from Ethiopia-Yemen and the Atlantic margins. Volcanic rifted margin...150 250 200 Ethiopia Yemen Southern Red Sea Oceanic Crust Ethiopia - Yemen Flood Volcanism Northeast |  | Rooney, Tyrone O., Lavigne, Andrew, Svoboda, Chris, Girard, Guillaume, Yirgu, Gezahegn, Ayalew, Dereje, Kappelman, John (2017) The making of an underplate: Pyroxenites from the Ethiopian lithosphere. Chemical Geology, 455. 264-281 doi:10.1016/j.chemgeo.2016.09.011 | Journal (article/letter/editorial) | | xenoliths throughout the northern East African Rift and Yemen exhibit characteristics of an initially depleted...BHVO-2G, BIR-1G, GSD-1G, NKT-1G and TB-1G, and powders of US Geological Survey standards BHVO-1, BIR-1, DTS-1...clinopyroxene and plagioclase occur inbetween grains and in granoblastic zones. The plagioclase which makes...recrystallization of clinopyroxene that had plagioclase exsolution lamella (Montanini et al., 2012)....that the small amount of recrystallized RI plagioclase controls trace element partitioning in this sample |  | | Journal (article/letter/editorial) | | mineral chemical features show that they are plagioclase-free spinel peridotites (lherzolite to harzburgite)...a carbonatitic melt, for example xenoliths from Yemen and Tanzania (Chazot et al., 1994; Rudnick et al...widespread volcanic province that extends from Yemen through Saudi Arabia, Jordan, Syria to Turkey covering...Rollinson, 2009; Krienitz and Haase, 2011), in Yemen (e.g. Sgualdo et al., 2015), in Jordan (Nasir and...comprises Pr plagioclase, magnetite, clinopyroxene and brown glass where plagioclase laths, about 0 |  | Grégoire, M., Langlade, J.A., Delpech, G., Dantas, C., Ceuleneer, G. (2009) Nature and evolution of the lithospheric mantle beneath the passive margin of East Oman: Evidence from mantle xenoliths sampled by Cenozoic alkaline lavas. Lithos, 112 (3) 203-216 doi:10.1016/j.lithos.2009.02.002 | Journal (article/letter/editorial) | | microcrystalline and olivine, clinopyroxene, plagioclase, nepheline, sanidine and Ti-magnetite are the...Safarjalani, 2002; Ismail et al., 2008 and Yemen, Chazot et al., 1996 and Ali and Arai, 2007). clinopyroxene abundance...2008; Nasir and Safarjalani, 2002 and Yemen, Chazot et al., 1996 and Ali and Arai, 2007). They are also similar...from the mantle spinel lherzolite xenoliths from Yemen (Chazot et al., 1996) as well as with those of Syria...Safarjalani, 2002; Ismail et al., 2008 and Yemen, Chazot et al., 1996 and Ali and Arai, 2007) and also similar |  | | Journal (article/letter/editorial) | | that many Gondwana CFB provinces (e.g. Ethiopia-Yemen, Deccan, and Karoo) are compositionally zoned and...for other Gondwana provinces, such as Ethiopia-Yemen, Deccan and Karoo, where CFB generation was triggered...other Gondwana CFB provinces, such as Ethiopia-Yemen and Deccan (Natali et al 2016, 2017). Coherently...removal of 22% and 22% olivine, 33% and 41% pr plagioclase, 16% and 17% clinopyroxene, followed by 5.0%...consistent with the fractionation of Fe-Ti oxides and plagioclase, respectively. Figure 10 displays the distribution |  | | Journal (article/letter/editorial) | | Ahmed Hassan Ahmed, Shehta Abdallah, Kamal Ahmed Ali, Minghua Ren PII: DOI: Reference: S0024-4937(19)30252-X...cite this article as: A.H. Ahmed, S. Abdallah, K.A. Ali, et al., Nature and evolution of the Precambrian...cumulates with decreasing amphibole and increasing plagioclase upward to the shallower depth. Geochemical and...Jordan, Syria, AC Lebanon, Saudi Arabia, and Yemen (Fig. 1). The volcanic eruptions are mostly initiated...hornblende ranges from 70 to 90 vol. %, and PT plagioclase in the range of 10 - 30 vol.%. Accessories of |  | | Journal (article/letter/editorial) | | fractional crystallization of olivine, clinopyroxene, plagioclase and spinel. The AC basaltic lavas show variations...spreading centres. The AN transitional (Ethiopian and Yemen trap series) to tholeiitic (Red Sea) volcanism is...and plagioclase. Some lavas display glomerocrysts of M clinopyroxene, olivine and plagioclase. Apatite...PT with a pilotaxitic texture dominated by plagioclase laths prismatic clinopyroxene and CE granular...frequently form glomerocrysts AN with olivine and plagioclase. The core compositions do not match experimentally |  | | Journal (article/letter/editorial) | | textures occur in samples with more than 50 vol% plagioclase. The host lava contains euhedral to anhedral...mm) are common in a groundmass dominated by plagioclase microlites (< 0.1 mm), which exhibit a preferred...1994, 2014; Medaris et al. 1999; Foley et al. 2006; Ali and Arai 2007; Choi et al. 2008; Will et al. 2010)...94:230–237 Ali M, Arai S (2007) Clinopyroxene-rich lherzolite xenoliths from Bir Ali, Yemen-possible product...(1986) Les enclaves de lherzolites à spinelle et plagioclase du volcan de Dibi (Adamaoua, Cameroun): des témoins |  | | Journal (article/letter/editorial) | | complexes in Sudan, Egypt, Jordan, Saudi Arabia, Yemen and Oman (Fig. 1). These various complexes started...of olivine, accompanied by clinopyroxene and plagioclase in variable proportions. RI PT 3. Analytical...decreasing MgO, probably marking the onset of plagioclase fractionation during the later stages of differentiation...between Sr and Eu indicates that fractionation of plagioclase was minor 13 ACCEPTED MANUSCRIPT throughout...of mainly olivine and clinopyroxene with some plagioclase in RI the more fractionated samples, consistent |  | Natali, Claudio, Beccaluva, Luigi, Bianchini, Gianluca, Ellam, Robert M., Savo, Andrea, Siena, Franca, Stuart, Finlay M. (2016) High-MgO lavas associated to CFB as indicators of plume-related thermochemical effects: The case of ultra-titaniferous picrite–basalt from the Northern Ethiopian–Yemeni Plateau. Gondwana Research, 34. 29-48 doi:10.1016/j.gr.2016.02.009 | Journal (article/letter/editorial) | | basalt sequences (Karoo, Deccan, Siberia, Ethiopia-Yemen, ParanàEtendeka, North Atlantic Province-NAP, Emeishan...D Cr-spinel, pinkish clinopyroxene and rare plagioclase; the groundmass is microcrystalline to TE hypocrystalline...alkaline character of the Yemeni rocks. Groundmass plagioclase varies between An62 and An40 and is coupled with...to crystallize at 1420°C, followed SC R by plagioclase (An77-81) at 1200°C, and clinopyroxene (mg# 81-82)...typically tholeiitic and characterized by extensive plagioclase crystallization after olivine, leading to a marked |  | | Journal (article/letter/editorial) | | followed by clinopyroxene (Cpx) RI for HT1, and plagioclase (Pl) and Cpx for LT, which are consistent with...G., Siena, F., 2017. Comparison among Ethiopia-Yemen, Deccan, and Karoo continental flood basalts of...Afro-Arabian domain: Insights D from Bir Ali mantle xenoliths (Yemen). Tectonophysics 650, 3-17. PT E ...Abbreviations: Ol = olivine, Cpx = clinopyroxene; Pl = plagioclase. 32 ACCEPTED MANUSCRIPT Figure 5 – Incompatible |  | Ayalew, D., Jung, S., Romer, R.L., Kersten, F., Pfänder, J.A., Garbe-Schönberg, D. (2016) Petrogenesis and origin of modern Ethiopian rift basalts: Constraints from isotope and trace element geochemistry. Lithos, 258. 1-14 doi:10.1016/j.lithos.2016.04.001 | Journal (article/letter/editorial) | | leading to flood basalt eruptions in Ethiopia and Yemen (Hofmann et al., 1997). At ~ 25 Ma, continental...are variably porphyritic with phenocrysts of plagioclase, olivine and clinopyroxene (Ti-augite) with rare...fractional crystallization of clinopyroxene and plagioclase. SC RI 5.2. Crustal contamination The lavas...Afro-Arabian domain: Insights from Bir Ali mantle xenoliths (Yemen). Tectonophysics 650, 3–17. Shaw, D |  | Wei, Ying, Mukasa, Samuel B., Zheng, Jianping, Fahnestock, Maria F., Bryce, Julia G. (2019) Phanerozoic lower crustal growth from heterogeneous mantle beneath the North China Craton: Insights from the diverse Hannuoba pyroxenite xenoliths. Lithos, 324. 55-67 doi:10.1016/j.lithos.2018.11.001 | Journal (article/letter/editorial) | | (15 - 62%), orthopyroxene (80 - 35%) and minor plagioclase (10 - 0%), and can be characterized as websterite...grains surrounding interstitial clinopyroxene and plagioclase PT grains all smaller than 0.5 mm in length...Afro-Arabian domain: insights from Bir Ali mantle xenoliths (Yemen). Tectonophysics 650, 3-17. Song, Y...Kempton and Harmon (1992). Py-pyroxene; EP T Pl-plagioclase; Grt-garnet; accum: accumulation. Fig. S2 Comparison |  | | Book (volume) | | Simpson et al., 1974e). Based on K/Ar dating ofthe plagioclase phenocrysts, the basalt was dated 72 ±7 m.y....1159-1171. Whitmarsh, R. B., Weser, O. E., Ross, D. A., Ali, S., Boudreaux, J. E., Coleman, R., Fleisher, R.... 23, p. 1-11S0. Whitmarsh, R. B., Weser, O. E., Ali, S., Boudreaux, J. E., Fleisher, R. L., Jipa, D....v. 23, p. 35-56. Whitmarsh, R. B., Weser, O. E., Ali, S., Boudreaux, J. E., Fleisher, R. L., Jipa, D....Red Sea region of Saudi Arabia (Delfour, 1976), Yemen (Geukens, 1966), and Sudan (Vail, 1978) are fundamentally |  | | Journal (article/letter/editorial) | | thought to derive mainly from the spinel to plagioclase–peridotite stability fields. They are varied...Kaeser et al., 2006; イエ とほぼ同様である． メン, 880–1130°C; Ali and Arai, 2007） ただし，野山岳のかんらん岩捕獲岩は 1200°C 前後の例外 ．これは，アイフェル...219–232. Ali, M. and Arai, S., 2007, Clinopyroxene-rich lherzolite xenoliths from Bir Ali, Yemen-possible |  | | Journal (article/letter/editorial) | | modal garnet abundance. Eu is fractioned in plagioclase (metamorphic or crystallizing from melts) and...ophiolites. In particular, we analyzed olivines from plagioclase-impregnated harzburgites and replacive dunites...affected the zircon. A granulite and a zoned plagioclase porphyritic metavolcanic rock from within the...consist mainly of quartz, chlorite, muscovite, plagioclase with associated silicates like kaolinite and...oxides. Melt films on the grain boundaries of plagioclase, potassium feldspar and quartz are approximately |
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