 | Ashwal, Lewis, Torsvik, Trond, Horváth, Péter, Harris, Chris, Webb, Susan, Werner, Stephanie, Corfu, Fernando (2016) A Mantle-derived Origin for Mauritian Trachytes. Journal of Petrology, 57 (9) 1645-1676 doi:10.1093/petrology/egw052 | Journal (article/letter/editorial) | | crystallization from basaltic magmas. Data from Mauritius suggest otherwise. Here, intrusive, nepheline-bearing... as confirmed by a U–Pb zircon age of 68 Ma. Trachyte mineralogy is dominated by low-Ca alkali feldspar...reaction rims that approach typical trachyte mineral compositions. Trachyte major elements cluster at 63 wt...Older Series basalts. Plutonic xenoliths from Mauritius do not fill the Daly Gap as in some other occurrences...continental crust, as suggested to exist under Mauritius, because such material should not yield nepheline-bearing |  | | Thesis/Dissertation | | LAGMATIC EVOLUTION OF MAURITIUS, STT INDI T 'CE T. by ALISTAIR NAPIER BAXTER, B.Sc. Thesis presented...of Science. 1972. Ii ABSTRACT The island of Mauritius lies in the western Indian Ocean at 57030'E. and...independently, away from the Central Indian Ocean Ridge. Mauritius is entirely volcanic, and three distinct series... 1. 2. TITLE PAGE 1. Regional setting of Mauritius and simplified bathyn]znetry of the western Indian...Submarine topography near Mauritius. 5 1. Simplified geological map of Mauritius, showing major structural |  | | Journal (issue) | | • • • • • • ARTICLES The Petrology of Mauritius. Otto Nicolaysen Progress Report of the Colonial...• • • 112 Illustrations The Petrologyof Mauritius Plate I Plate II Plate III Plate IV Fig. 1 Fig...Fig. 8 Fig. 9 Simplified Geological Map of Mauritius . Photomicrographs of Mauritian Rocks • ,...facing p. • • • • Sketch Map of Seychelles-Mauritius Ridge • • Triangular Diagram showing Composition...of Differentiation in Oceanic Islands . . . . . Trachyte Differentiates plotted on Ternary Diagram Si0 |  | | Journal (article/letter/editorial) | | contemporary with the celebrated dodo in the Island of Mauritius. That island had been till then the only place...Enjihrornaclius has been applied to it. The Island of Mauritius, 95 miles to the south-west, was inhabited by...day there are no birds in either Rodriguez or Mauritius nearly related to the Ocydromine group of Downloaded...belief that there was once a time when Rodriguez, Mauritius, Bourbon, Madagascar, and the Seychelles were...That the solitaire of Rodriguez and the dodo of Mauritius, much as they eventually came to differ, sprang |  | | Journal (article/letter/editorial) | | and mineralogy. INTRODUCTION HE olivine-basalt—trachyte associations of oceanic islands frequently include...recently encountered such a case in the island of Mauritius. An analysed lava has the chemical composition...in sparse larger grains. B. Oligoclase-basalt, Mauritius. Less perfect trachytic structure. Microphenocrysts...•1- Andesite + Olivine andes + Trachyandesi trachyte-an -1- Oligoclase M M M M M M M M M M M...beyond © TYPE MUGEARITE 0 NEW ZEALAND S MAURITIUS OLIGOCLASE BASALT • HAWAIIAN OLIGOCLASE |  | | Journal (issue) | | ARTICLES The Geology and Mineral Resources of Mauritius. By E. S. W. Simpson, M.Sc., Department of Geology...Geological Map of Mauritius • • • . facing p. 238 Fig. I Location Map of Mauritius • • • • Plate...Falls, Savanne River • • Plate IX Mt. Camizard-Trachyte Dome • • Plate X Montagne Du Rempart . ... 244 THE GEOLOGY AND MINERAL RESOURCES OF MAURITIUS BY E. S. W. SIMPSON, M.Sc. Department of Geology...Author's Note THE SYSTEMATIC GEOLOGICAL SURVEY OF MAURITIUS WAS ASSIGNED TO THE Department of Geology, |  | | Journal (article/letter/editorial) | | Tereeira, Tahiti, Mauritius, Ascension, St. Helena, the Galapagos Archipelago, Trachyte and Basalt, Distributiort...sandstone. This stone, however, is only altered trachyte; and a nearly similar variety, but often honeycombed...masses, and sometimes in veins, both in the altered trachyte and in an associated mass of scoriaceous basalt...aecol~ding to the view above given, consist of trachyte softened and altered in situ, the presence of...geological history between St. Helena, St. Jago, and Mauritius. All three islands are bounded (at least in the |  | | Journal (article/letter/editorial) | | Britain ratios in some vulcauic rocks from Mauritius, Indian Ocean A. N. BAXTER* Department of Geology...presents K/Rb ratios for 223 volcanic rocks from Mauritius, one of the Mascarene island group of the western...peripheral reef deposits, the sub-aerial portion of Mauritius is entirely composed of volcanic rocks of Pliocene--Pleistocene...comprising a highly differentiated transitional basalt-trachyte suite (BAXTER. in press a). a subordinate Intermediate...imply. BAXTERA. N. (1972) Magmatic evolution of Mauritius, The factors controlling the behaviour of the |  | | Journal (article/letter/editorial) | | stage of La Réunion and contemporaneously at Mauritius, the SC second youngest island of the hotspot...extended isotope field defined by the Réunion and Mauritius volcanoes overlaps with the OIB field of the Society...Sr-Nd-Pb isotope variations shown by Réunion and Mauritius volcanoes require a third source CE component...existence of a hidden continent below the island of Mauritius, by suggesting that the continental component...than those found in the three lava series of Mauritius, the second youngest 3 ACCEPTED MANUSCRIPT island |  | | Journal (article/letter/editorial) | | about half the examples of the oceanic basalt-trachyte association so far inspected, but is not found...found either in the basalt-mugearite subgroup of trachyte-bearing suites of this association or in oceanic...26, 2014 in the discussion of oceanic basalt-trachyte associations the use of the Harker diagram is...process. VARIANCE RELATIONS IN THE OCEANIC BASALT-TRACHYTE ASSOCIATION In Table 1 are listed three suites...S values for some larger suites of the basalt-trachyte association Locality Marquesas. Samoa, American |  | | Journal (article/letter/editorial) | | tandfonline.com/loi/tigr20 Geochemistry of Lavas from Mauritius, Indian Ocean: Mantle Sources and Petrogenesis... N. Baxter (2003) Geochemistry of Lavas from Mauritius, Indian Ocean: Mantle Sources and Petrogenesis...rights reserved. Geochemistry of Lavas from Mauritius, Indian Ocean: Mantle Sources and Petrogenesis...for mafic lavas from the Mascarene island of Mauritius reveal that the shield-stage Older Series (with...post-shield Intermediate and Younger Series lavas of Mauritius have systematically greater values of 143Nd/144Nd |  | | Journal (article/letter/editorial) | | share of islands, although with the exception of Mauritius and Reunion (and, of course, the large mass of...they are restricted to the western half. All but Mauritius and Reunion lie well away from the shipping lanes...small craft, generally sail. South of these, Mauritius and the adjacent Reunion are of considerable size...otherwise visits to any of these outposts beyond Mauritius have over the last seven decades been few and...ashes capped by basalt flows from the crater. Old trachyte appears at one point. The soil contains much sulphur |  | | Journal (article/letter/editorial) | | on the Sey chelles Islands and the islands of Mauritius and Sri Lanka. Preliminary results of the voyage...the environs of Victoria. rocks of the basalt-trachyte series (11, 13), including alkalic-potassic picritic...0.7-6.4 Ch1, 0.5-1.1 porosity Alkali basalt Mauritius Phenocrysts: (5.2-24.7) 2.1-7.3 Pl, 3.3-5.1 Cpx...Petrophysical properties of rocks from the islands of Mauritius, Mane (Seychelles Islands), and Sri Lanka, in...However, as indicated Samples from the island of Mauritius by the elastic properties, especially represent |  | | Journal (article/letter/editorial) | | (max. 9 Ma) plume-related, volcanic island of Mauritius, we found Precambrian zircons with ages between...ocean-island volcano of Mauritius (Torsvik et al., 2013; Ashwal et al., 2017) (Figure 1). Mauritius is the second-youngest...1989; Duncan, 1990; Courtillot et al., 2003). Mauritius lavas have been divided by age into the Older...on the island. The background to our work in Mauritius involves an interesting story, which is briefly...summarized here. During a two-day layover in Mauritius, en route to Rajasthan, our colleague Bjørn Jamtveit |  | | Journal (article/letter/editorial) | | highly altered volcanic rock moderately altered trachyte highly altered volcanic rock moderately altered...moderately altered ol + pl basalt moderately altered trachyte highly altered volcanic rock moderately altered...(alkali basalt?) ~ 1340 m 52 Ma slightly altered trachyte Cameroon Line (Tinhosa Granda Island) l°21'l"N;...3000 m 18 Ma trachyte 91 Ma mugearite 7° East Seamount AG51-11-10 37°S; 7°E trachyte 348 J.M. O'CONNOR...from [34]. The K-Ar age range for the islands of Mauritius is from [35]. Mercator projection. TABLE 3 Finite |  | | Journal (article/letter/editorial) | | ATLANTIC OCEAN 86 MARION ISLAND INDIAN OCEAN 2 MAURITIUS ISLAND INO|AN OCEAN 2S5 MARTIN VAS ARCHIPELAGO...OLtBASALT SERIES TRISTAN|T| • K ALK,OLIBASALT SIRIES TRACHYTE - K ALK,OLtBASALT SER|ES SOO|¢ ALKAL| OLIVINE...SERIES BENHQR|TE . NA ALK,OLtBASALT SER|ES SOD|C TRACHYTE . NA ALKtO~tBASALT SERZES K-CONTENT OF SUBALKAL|NE |  | | Journal (article/letter/editorial) | | years ago in draining a swamp in the island of Mauritius; an event which makes the conjecture probable...grey felspar rock, rich in quartz, and of the trachyte group. Professor E. Hull, who has lately fully..., Dublin, 1876," p. 17 et seq.), has named it Trachyte-porphyry, and J. Both (Beitr. Petrogr. pluton...worth observation. In no other part of Ireland are trachyte rocks known, [except to the west of Hillsborough...volcanic rock, called by Pumpelly a porphyritic trachyte. Before entering Kalgan, you pass underneath a |  | Darwin, C., A., D. T. (1845) Geological Observations on the Volcanic Islands visited during the voyage of H. M. S. Beagle, together with some brief notices on the geology of Australia and the Cape of Good Hope ; being the second part of the Geology of the Voyage of the Beagle, under the command of Capt. Fitzroy, R. N., during the years 1832 to 1836: London, pp. 176, with a map of the Island of Ascension. Quarterly Journal of the Geological Society, 1 (1) 556-558 doi:10.1144/gsl.jgs.1845.001.01.101 | Journal (article/letter/editorial) | | other islands, and some general considerations on trachyte and basalt, and on the distribution of volcanic...regard to the islands of St. Helena, St. Iago, and Mauritius that all three are bounded (at least in the parts |  | Melluso, L., Tucker, R.D., Cucciniello, C., le Roex, A.P., Morra, V., Zanetti, A., Rakotoson, R.L. (2018) The magmatic evolution and genesis of the Quaternary basanite-trachyphonolite suite of Itasy (Madagascar) as inferred by geochemistry, Sr-Nd-Pb isotopes and trace element distribution in coexisting phases. Lithos, 310. 50-64 doi:10.1016/j.lithos.2018.04.003 | Journal (article/letter/editorial) | | relationships. It includes: (a) oldest eruptions of trachyte and trachyphonolite, (b) deposition of lacustrine...al., 2012, 2014; Libya, Lustrino et al., 2012; Mauritius: Sheth et al., 2003; Ashwal et al., 2016; Ethiopian...clinopyroxene/liquid trace element partitioning in natural trachyte-phonolite systems: a EMP/LAICP-MS case study from...Rogers, N.W., 2011. Evolution of pantellerite-trachyte-phonolite volcanoes by fractional crystallization...Baxter, A.N., 2003. Geochemistry of lavas from Mauritius, Indian Ocean: mantle sources and petrogenesis |  | | Journal (article/letter/editorial) | | hawaiites; star = mugearite; filled triangle = trachyte I 100 I 1 //A ~'\ \, a / I I I I ,I...I I I i~ I ~ o ~ o ~ I I 1 I I 1 TRACHYTE I i I I I _~io o o t MUGEARiTE o_.~__o...an i m p o r t a n t role in the formation of trachyte. I n conclusion, it should be realized t h a t...Hawaiian Lavas 37 SHAND,CF. S. J. : The lavas of Mauritius. Geol. Soc. London Quart. J. 89, 1--13 (1933) |  | | Journal (article/letter/editorial) | | layers of basalt, laterite, and in the upper parts trachyte, with portions of upraised coral reef chiefly...recorded lichen-flora of the neighbouring islands of Mauritius and Bourbon, which are not only of much larger...appear when we mention that the lichens of the Mauritius, as enumerated by Dr. Weddell, in vol. vii. (n |  | | Journal (article/letter/editorial) | | contained rocks belonging to the alkali basalt-trachyte-phonolite suite or the andesitedacite-rhyolite...Madeira, „ Gran Canaria, „ Tenerife, Gomera, ,, Mauritius, Indian Ocean Reunion, „ Ross Island, Antarctica...including mugearite, and oligoclase andesite. T. Trachyte including syenite and shonkinite. P. Phonolite...plagioclase slowly making an appearance. At the trachyte stage of the trend, sodium-rich alkali feldspar...published analyses of rocks in the oceanic basalt-trachyte association the frequency distributions of SiO2) |  | Owen-Smith, T.M., Ashwal, L.D., Torsvik, T.H., Ganerød, M., Nebel, O., Webb, S.J., Werner, S.C. (2013) Seychelles alkaline suite records the culmination of Deccan Traps continental flood volcanism. Lithos, 182. 33-47 doi:10.1016/j.lithos.2013.09.011 | Journal (article/letter/editorial) | | lithologies encompass a larger range, from 66.8 ± 0.8 (trachyte), through syenite and microsyenite, to 61.3 ±...microsyenite, which intrudes and brecciates the trachyte tuffs, entraining fragments of the latter up to...of syenite and earlier trachyte, with reaction haloes, in porphyritic trachyte tuff, from Pointe Ramasse...Microsyenite (paler) intruding and brecciating trachyte tuff (darker), south of Pointe Ramasse Tout. ...Fe–Ti oxides and accessory apatite and zircon. The trachyte is strictly a matrix-supported trachytic lithic |  | | Journal (article/letter/editorial) | | this island also, as well as in St. Jago and Mauritius, he has observed in his volume on Volcanic Islands...cliffs, says M. Virlet, the separate masses of trachyte and obsidian are seen to mould themselves into...found that the vesicles or pores of the beds of trachyte were lengthened in the several directions in which...infer that an intumescent mass of pasty or fluid trachyte was forcing up the top of the hill, as we see...the broken basaltic escarpments of St. Jago and Mauritius, as described by Mr. Darwin. There has been some |  | | Journal (article/letter/editorial) | | Basin Tromelin y 20°S Bassa da India Europa Mauritius Reunion Reunion Basin Fig. 1. Map of the western...benmoreite KT moderately porphyritic amph 4% trachyte ftp 3% phonoIHe cpx < 1 % Tlmgt<1% basanhe...basanite; Neph, nephelinite; Teph, tephrite; Tr, trachyte; P t phonotephrite; Ha, hawaiite; Ben, benmorelte;...0.5128 SLPaul 0.5130 Rodriguos •o 05127 Mauritius Reunion 0.5128 0.703 0.7036 0.704 •o z ...Heard Kerguelen and Hoard 20 60 rince Edward, Mauritius and Reunion Amsterda 15 M 10 S° 40 Marlon |
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