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| in Undersaturated Volcanic Rocks from the East Otago Volcanic Province (New Zealand) and Related Rocks...petrology of the East Otago Volcanic Province (late Miocene), including the Dunedin Complex, is dominated...range of relatively potassic volcanic rocks is also developed in the Province. The degree of undersaturation...intrusives in the Province, assessed in conjunction with similar data from other volcanic provinces, demonstrate...production of phonolite from trachyte in the East Otago Province has not been demonstrated. The mafic variants |
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| Petrology of Dunedin Volcano R.C. Price Department of Geology, University of Otago, Dunedin, New Zealand* B.W...indicate that the range in rock types making up the Dunedin volcano has developed by crystal fractionation...Introduction Age and History of the Volcanism The Dunedin Volcanics form a prominent massif about 30 km in...centred on Port Chalmers in the middle reaches of Otago Harbour, across the northeastern end of the Taieri...Taieri graben (Fig. 1). Volcanism in the Dunedin area commenced with the emplacement of submarine basaltic |
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| NEW ZEALAND DEPARTMENT OF SCIENTIFIC AND INDUSTRIAL RESEARCH NEW ZEALAND GEOLOGICAL SURVEY 125th ANNIVERSARY...1865 -1990 NEW ZEALAND GEOLOGICAL SURVEY BULLETIN 104 ISSN 0077-9628 Minerals of New Zealand by G. L....initials should be G.T., not G.L. Lower Hutt, New Zealand 1990 I I Beach sand, alluvium, • terrace...rocka, particularly greywacke Young (Cenozoic) volcanic rocks, including 4. modern volcanoes 5. s 9...9 Iii ■ t Old (Mesozoic and Paleozoic) volcanic rocks Schist Gneiss and granulite 20 6 Figure |
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| the Banks Peninsula Volcanoes, South Island, New Zealand R.C. Price I and S.R. Taylor 2 1 Department of...the volcanic sequence of the twin volcanoes of Lyttelton and Akaroa, Banks Peninsula, New Zealand a number...Formation, but unconformably overlain by the main volcanic dome sequence, is a unit of rhyolite (Gebbies...into the crust. Between 12 and 9.7 m.y. a large volcanic dome, composed mainly of hawaiite, was built at...Lyttelton. Dykes, which intrude the Lyttelton volcanic sequence, range in composition from basalt to |
 | Brenna, Marco, Pontesilli, Alessio, Mollo, Silvio, Masotta, Matteo, Cronin, Shane J., Smith, Ian E.M., Moufti, Mohammed Rashad Hassan, Scarlato, Piergiorgio (2019) Intra-eruptive trachyte-phonolite transition: Natural evidence and experimental constraints on the role of crystal mushes. American Mineralogist, 104 (12) 1750-1764 doi:10.2138/am-2019-6963 | Journal (article/letter/editorial) |
| Scarlato7 Geology Department, University of Otago, Dunedin, New Zealand. Orcid 0000-0001-6096-6999 2 Geology...Geology Department, University of Otago, Dunedin, New Zealand 3 Dipartimento di Scienze della Terra, Sapienza...Environment, University of Auckland, Auckland, New Zealand 6 Faculty of Earth Sciences, King Abdulaziz University...Shaatha pyroclastic sequence in the Harrat Rahat Volcanic Field (Kingdom of Saudi Arabia). We performed... Clinopyroxene crystallizes with compositions diopside-augite and augite-hedenbergite, respectively, |
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| LHERZOLITE-BEARING MAGMAS I N THE TASMANIAN VOLCANIC PROVINCE F.L. S U T H E R L A N D Australian Museum...tholeiite near Andover in the Tasmanian Tertiary volcanic province. They show a high-pressure mineralogy of predominant...aluminous enstatite (Mgg0) and lesser aluminous diopside and chrome-bearing spinel, and resemble lherzolite...crystallisation at pressures between 8 - 1 3 kbar. With this new record, lherzolite-bearing lavas in Tasmania now...r o m t h e T a s m a n i a n T e r t i a r y volcanic p r o v i n c e a n d discusses t h e c o m p |
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| Earth Sciences, Macquarie University, North Ryde, New South Wales 2113 Australia ABSTRACT. Cainozoic alkali...alkali baS'altic rocks from the Southern Highlands province, eastern Australia, range from olivine nephelinites...Southern Highlands province (fig. I) covers approx 50 km2 southwest of Sydney, New South Wales, Australia...Southern Highlands basaltic rocks as a discrete province is partly based on their geographical distribution...charac terize the Southern Highlands as a discrete province, to show the domi nance of primary or primitive |
 | Green, D. H., Edgar, A. D., Beasley, P., Kiss, E., Ware, N. G. (1974) Upper mantle source for some hawaiites, mugearites and benmoreites. Contributions to Mineralogy and Petrology, 48 (1) 33-43 doi:10.1007/bf00399108 | Journal (article/letter/editorial) |
| high pressure mineralogy in north-eastern Otago, New Zealand led Wright (1966) and Price and Green (1972)...of Mg @ Fe+~ values for 130 lherzolite-bearing volcanic rocks of Tertiary to Recent age occurring in Eastern...Sutherland): T10, T23, T25, T29 Tasmanian Tertiary Basalt province: 2943 Mr. Mitchell, south-eastern Queensland Main...Mg-values define the Mg-value of olivine in the source region for basalts as FOss_90, and if the upper mantle...nepheline hawaiite (25) (Table 1). The Tasmanian province also contains unfractionated (in the sense of |
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| enormous volume of salic volcanics in the Kenya province, compared with that of associated basic and intermediate...strontium isotope data for syenites of the Oslo province, where basic rocks are also subordinate in volume...of olivine nodules and pyroxene megacrysts in a New South Wales haiwaiite is taken b) Wilkinson & Binns...basaltic magmas and pyroxenes as illustrated on the diopside-olivine-sfl'ca diagram. Min. ,~.oc. Amer., Spec...in undersaturated volcanic rocks from the East Otago volcanic province (New Zealand) and related rocks |
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| evolved basalts plot near the normative olivine-diopside divide and the more evolved basalts project into...SVSr/86Sr ratio (0.707) typical of basalts in this region. The very low Rb/Sr ratios limit processes that...south-central part of the Great Basin physiographic province. The basin is partly filled by alluvium, with...local outcrops of tuff of Miocene age and basaltic volcanic rocks of Pliocene and Quaternary age. The basalts...cones, lava flows, and associated dikes. These volcanic rocks, plus a cluster of cones and flows immediately |
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| Department of Geology, University of Otago, Leith St, Dunedin 9054, New Zealand 2, MA james.scott@otago.ac...spinel facies harzburgitic xenolith suites from New Zealand are examined. Samples from Cape L’Evique (CLEV)...in two highly depleted peridotite suites from New Zealand (Fig. 1) with the goal of using this information...spinel facies peridotites. 2. GEOLOGICAL SETTING New Zealand and offshore islands represent a small exposed...flow at Cape L’Evique on Chatham Island, ~800 km east of the South Island (Fig. 1). The NU Chatham Islands |
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| 20 km long, 2 to 4 km wide en echelon line of volcanic cones that extend in a south-southwest direction...part of the Erebus volcanic province (Kyle & Cole, 1974) of the McMurdo Volcanic Group (Harrington, 1958;...1968); the latter encompasses all Late Cenozoic volcanic rocks from Victoria Land, islands in the westerns...the Balleny Islands (Fig. 1). The Erebus volcanic province is composed of strongly undersaturated alkaline...Department of Geoscience, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801. I Journil |
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| and Sub-Alkalic Volcanism in South Auckland, New Zealand Warwick J. Rafferty and Robert F. Heming Geology...Auckland, New Zealand Abstract. A significant feature of Quaternary volcanism in New Zealand is the presence...the two magmas. Introduction The Quaternary volcanic field of South Auckland contains over 70 strombolian...volcanism in the Coromandel and Taupo areas to the east and southeast. Some volcanism also occurred over...uplifted Mesozoic basement block (Hunua Block) to the east. The field forms part of a much greater area of |
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| residual inclusions are almost exclusively found in volcanic rocks of alkalic affinity, whereas alpine peridotites...example of ultramafic inclusions in an abyssal volcanic rock. In contrast to most nodules in alkalic rocks...to 35 kb and the effect of TiO2 on the olivine-diopside reactions at high pressure. Carnegie Inst. Washington...Petrology, mineralogy and geochemistry of the East Molokai Volcanic Series, Hawaii. U.S. Geol. Surv. Prof. Papers...pressure megacrysts in alkaline lavas from northeastern New South Wales. Am. J. Sci. 269, 132-168 (1970) Bosley |
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| 9 by Springer-Verlag 1978 Nature of Alkalic Volcanic Rock Series Akiho Miyashiro Department of Geological...Geological Sciences, State University of New York at Albany, Albany, New York 12222, USA Abstract. The alkalic...n a p p e a r to exist in large-scale alkalic volcanic associations. One (here d e s i g n a t e d as...contamination in the Triassic subalkalic (tholeiitic) province of the eastern United States (e.g., Barker and...appears unworkable so far as large-scale alkalic volcanic associations are concerned. All rocks, from mafic |
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| California, Berkeley, California FIRST EDITION l NEW YORK TORONTO LONDON McGRAW-HILL BOOK COMPANY,...'\'olcanic and Plutonic Rocks. CharacterisLics of Volcanic Rocks. Characteristics of Plutonic Rocks. Outline...TRACEYTE VOLCANIC ASSOCIATION. Introductory Statement. The Volcanic Rocks of the Intra-Pacific Region. Volcanic...Leucite-Basalt Potash-Trachybasalt Association 9. VOLCANIC ASSOCIATIONS OF NONOROGENIC CONTINENTAL REGIONS...Diabase Association. The Volcanic Association of the Brito-Arctic Province. Petrogenesis of the Tholeiite |
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| Spinel-Wehrlite Xenoliths from Foster Crater, McMurdo Volcanic Group, Antarctica by J. A. GAMBLE 1 AND P. R....to many of the basanites from the Erebus Volcanic Province. Textural relationships of the kaersutite...Wellington, Private Bag, Wellington, New Zealand 2 Department of Geo sciences, New Mexico Institute of Mining and...and Technology, Socorro, New Mexico 87801 756 J. A. GAMBLE AND P. R. KYLE PETROGRAPHY Amphibole-and...scoria cone in the Erebus volcanic province of the Late Cenozoic McMurdo Volcanic Group (Kyle & Cole, 1974; |
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| as that covered by the entire set of basaltic volcanic suites from picrites and ankaramites to rhyolitcs...rhyolitcs, trachytes and phonolites. Introduction Volcanic lavas are surely the group of igneous rocks whose...higher temperatures than olivine, especially in the region where the magnetite melting curve crosses those...One-atmosphere liquidus versus MgO for terrestrial volcanic rocks. Filled symbols are silicate liquidi. Open...represented by the lavas, in several closely-studied volcanic sequences pass from labradorite-normative to andesine-normative |
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| alkaline voleanies and included xenoliths from Oberon, New South Wales, Australia Paul A. Morris Department...Australia contain variable abundances of small Cr-diopside lherzolite xenoliths. Despite a limited range...stratigraphy and the composition of the source region of basaltic rocks. Furthermore, as rapid transport...Shaw 1984; O'Reilly and Griffin 1984, 1985). Cr-diopside series xenoliths are the most common inclusion...pressures. This paper describes a suite of Cr-diopside series spinel lherzolite xenoliths and their host |
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| relationships with the leucitebearing lavas of the Roman Region. The clinopyroxenites are essentially composed...inclusions in leucitebearing volcanics of the Roman Region (Lacroix, 1917a and 1917b; Washington, 1927;Narici...ultramafic xenolith assemblages from the Roman Region have encouraged the author over the past few years...investigated and controversial volcano of the Roman Region (Rittmann, 1933; Hurley et al., 1966; Savelli,...natural c l i n o p y r o x e n e from the R o m a n Region (e.g. VEI 16: A1vi = 0 . 1 2 - 0 . 1 8 , CaAlzSiO |
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| studied from the Bufumbira Bay area of the Birunga volcanic field, in south-west Uganda, form two distinct...Somma and Vesuvius magmas m a y be produced by sub-volcanic fractionation of biotitepyroxenite assemblages...after working on the Roecamonfina, Nyiragongo and New South Wales leucite-bearing lavas respectively, all...(Ky) and Fort Portal (FP) areas of the ToroAnkole volcanic field (after Holmes and Harwood, 1932, 1937).... 3 for explanation of symbols. In addition 0, 9 new glass analyses belonging to the phonolitic-tephrite |
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| of the Okete Volcanics, western North Island, New Zealand Roger M. Briggs 1 and Gordon G. Goles 2 1 Earth...Department, University of Waikato, Hamilton, New Zealand 2 Center for Volcanology, University of Oregon...tectonic environment of western North Island, New Zealand. The lavas and tufts of the Oketc Volcanics have...depletion. This paper describes an alkaline series of volcanic rocks ranging in composition from basanites to...(Briggs 1983) which is a formation of the Alexandra Volcanic Group (Kear 1960) situated in western North Island |
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| Western Indian Ocean ABSTRACT Three phases of volcanic activity, older, middle, and younger, are represented...46° E. (Fig. 1). The four main islands are, from east to west, Mayotte, Anjouan, Moheli, and Grand Comore...Lacroix (1922) was the first to point out the volcanic nature of the islands, and he provided the first...progressively smoother topography of the islands from east to west, reflecting their decreasing age. Note also...topography of the west and the deep soil cover in the east are taken to indicate that relative ages are in |
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| mugearite-megacryst association from north-eastern New South Wales: implications for high-pressure amphibole-dominated...Department of Geology and Geophysics, University of New England, Arm• 2351, Australia 2 Department of Geology...analcime-rich mugearite near Spring Mount in north-eastern New South Wales contains dominant kaersutite, lesser...northeastern New South Wales Central Province of early Oligocene and early Miocene volcanic rocks (Wellman...M o u n t flow to o t h e r C a i n o z o i c volcanic activity in n o r t h - e a s t e r n N e w S |
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| along the eastern margin of the Basin and Range province in northern Arizona and Utah has created a suite...basaltic volcanism for the whole Basin and Range province, are explained in terms of upper mantle dynamics...Cenozoic in the core area of the Basin and Range province and causing progressive thinning or "erosion"...nature of the basaltic lavas in the Basin and Range province and related their origin to high surface heat...about 18 m.y. ago in the western Basin and Range province that marked the calc-alkalic to basaltic transition; |
