 | | Journal (article/letter/editorial) | | distribution of multivalent cations in chemically complex magnetic spinels. Keywords: Analysis, chemical...distribution in the structures of natural spinels is complex due to difficulties in assigning the cations to...not well suited to the analysis of chemically complex PEARCE ET AL.: CATION SITE OCCUPANIES IN NATURAL...parameter and oxygen coordinate for chemically complex minerals of known chemical composition (Carbonin...effective site and valency probe for chemically complex minerals containing 3d metals, which provides information |  | Riishuus, M. S., Peate, D. W., Tegner, C., Wilson, J. R., Brooks, C. K. (2008) Petrogenesis of Cogenetic Silica-Oversaturated and -Undersaturated Syenites by Periodic Recharge in a Crustally Contaminated Magma Chamber: the Kangerlussuaq Intrusion, East Greenland. Journal of Petrology, 49 (3) 493-522 doi:10.1093/petrology/egm090 | Journal (article/letter/editorial) | | volumetrically dominated by the Kangerlussuaq Alkaline Complex, which includes the KI (Wager, 1965; Kempe & Deer...world. To the authors’ knowledge the Brandberg Complex (Schmitt et al., 2000), and Khibina and Lovozero...(1993) presented data from the complexes of Marangudzi, Zimbabwe, and Mt. Brome, southern Quebec, characterized...and nepheline syenites (e.g. the Il|¤ maussaq, Marangudzi and Mt. Brome complexes), the Kangerlussuaq Intrusion...basement. (b) Map of the Kangerlussuaq Alkaline Complex west of Kangerlussuaq Fjord (after Kempe et al |  | | Journal (article/letter/editorial) | | southern Appalachian Piedmontareasof North Carolina, South Carolina, and Georgia. Detailed petrographicdescriptionsof...Carolina pluton (Hermes,1968,1970),and the Buffalo, South Carolina pluton (Medlin et al.,1972) are availablein...Carolina slate belts in southeasternFairfield County, South Carolina, and is situated along regional strike...of the sequence. alteredgabbro. Magnetite and ilmenite are ubiqui- tous accessoryminerals,but their...0.8 0.7 0.5 l.o Magnetite 0.3 0.2 0.5 Ilmenite 0.3 0.5 0.7 2.I Spinel ET ET Sulfldes |  | | Journal (article/letter/editorial) | | PETROGENESIS OF THE LATE CRETACEOUS ABU KHURUQ ALKALINE COMPLEX, EASTERN DESERT, EGYPT Mohamed A. OBEID§ Department...The Late Cretaceous rocks of the Abu Khuruq ring complex (AKRC), exposed in the southern Eastern Desert...nephelinebearing pegmatites. The rocks of the complex are dominantly metaluminous and enriched in both...contaminated by crustal material. Keywords: Abu Khuruq ring complex, syenite, gabbro, phonolite, trachyte, geochemistry...Desert, Egypt. Introduction The Abu Khuruq ring complex (AKRC), located in the southern Eastern Desert |  | | Journal (article/letter/editorial) | | and geochemistry of acid veins in the Freetown complex, Sierra Leone R. D. BECKINSALE, J. F. W. BOWLES...dating other, similar, intrusions. T H E Freetown Complex is a large basic intrusion on the western seaboard...produced by separate episodes of intrusion. The Complex is intruded into Precambrian metamorphic rocks...Liberia and that of Sierra Leone, the Freetown Complex, and the initial rifting that led to the formation...polarity reversal occurred during the cooling of the Complex (Briden, Henthorn, and Rex, I97I ), for which a |  | Dosso, L., Vidal, P., Cantagrel, J.M., Lameyre, J., Marot, A., Zimine, S. (1979) “Kerguelen: Continental fragment or oceanic island?”: Petrology and isotopic geochemistry evidence. Earth and Planetary Science Letters, 43 (1) 46-60 doi:10.1016/0012-821x(79)90154-7 | Journal (article/letter/editorial) | | contains five ring complexes composed of rocks of syenitic and granitic affinities. These ring complexes...younger to the north. The main rock types of the ring complexes consist of amphibole syenites and biotite...isotopic study of the southern syenite-granite ring complex of the Rallier du Baty peninsula is presented...outermost ring, to H, innermost ring) is given: outer gabbros: K-At age = 15-13 m.y. ring A: K-At age...age =- 12 re.y, ring B: whole rock Rb-Sr age = 9.7 ± 0,2 m.y. (2o) ring C: whole rock Rb-Sr age = |  | | Journal (article/letter/editorial) | | and Petrology of the Red Hill Alkaline Igneous Complex, New Hampshire, U.S.A. by C. M. B. HENDERSON 1...has shown that it consists of several units with ring- or pluglike form, in order of intrusion: Outer...fluid-saturated conditions. It seems likely that the complex formed by emplacement of fractionated magmas derived...These were intruded into the OCS/NSS unit along ring fractures to form the FTS and GPS units. Rock and...after the main complex was formed. INTRODUCTION This study of the Red Hill complex forms part of continuing |  | | Book | | AIr ring complexes and the chapter devoted to the Cameroon line. A detailed review of African ring complexes...discrimination between tholeiitic, transitional and alkaline ring complexes. Based on the available data (including...so-called alkaline intrusions which occur in African ring complexes are associated with tholeiitic or transitional...geochemical criteria discriminating the anorogenic ring complexes (including A - granites s.s.) from the...review our present knowledge of the main African ring complexes and emphasize the need for a new classification |  | | Book | | Japan-Ryukyu Izu-Bonin-Marianas Philippines-Sulawesi South-west Pacific New Zealand Sumatra-Java Southern Italy...sea-level is Macquarie Island, situated 1100 kilometres south-west of New Zea¬ land. In the northern part of the...section through the Macquarie Island ophiolite complex (after Griffin and Varne 1980). VOLCANIC SEQUENCE...Sediments SHEETED DYKE COMPLEX MASSIVE GAB BROS LAYERED GABBR0 COMPLEX X~ X X—X~X~X— x— x — X...present-day volcanism is concentrated in a north¬ east-south-west belt through the middle of Iceland, lying parallel |  | | Book | | of necessity limited. The Geological Society of South Africa recently published in a single volume a large...canyons of two drainage systems, one north and one south of the Wallowa-Seven Devils Mountains divide (Hooper...certainly present in the thicker sections to the south. The flows are divided into eleven chemical types...magnetic polarity at the base of the Imnaha Basalt, south of the Wallowa Mountains (Swanson et aI., 1979;...northwest. Rl Grande Ronde flows extend as far south and east as do Imnaha flows (Fig. 3a; Fitzgerald |  | | Journal (article/letter/editorial) | | 0006 Adams, C. J. D. K/Ar ages from the basement complex of the Channel Islands (United Kingdom) and the...Greenland Group and Constant Gneiss, West Coast, South Island 28(1): 98-104 0008 Adams, I.; Thomas, J...and oxygen isotope ratio of snow and firn in the South Pole region 3(3): 267-274 0034 Alderton, D. H...Measurements relating to the genesis of the Tsumeb pipe, South-West Africa 9(5): 448-453 0056 Allsopp, H. L.;...the early Precambrian Amitsoq gneisses, Godthaab District, West Greenland 19(1): 22-28 0114 Baadsgaard |
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