 | | Report (chapter) | | Ababa University, PO Box 729/1033 Addis Ababa, Ethiopia (e-mail: dereayal@ geol.aau, edu. et) 2Department...continental extension by several million years (e.g. Ethiopia-Yemen), magmatism and break-up can be synchronous...huge volumes of melt seen in CFB provinces. In Ethiopia, Oligocene-Miocene felsic volcanic strata (rhyolites...observations for the northern MER and uplifted plateau region that demonstrate significant modification of the...rhyolites were erupted across a c.1000 km diameter region between 31 and 29 Ma (Ayalew et al. 2002; Ayalew |  | | Journal (article/letter/editorial) | | and Ti-magnetite, instead of anorthoclase, sodic sanidine, aegirine-augite and ilmenite. The minerals occur...Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia Introduction The close spacial and temporal association...provinces (e.g. Karoo, Paraná, Deccan, Yemen, Ethiopia) led some authors to suggest that the rhyolites...margins; Ebinger and Sleep 1998). Extension in the region began in the late Oligocene at ca. 26 Ma (Menzies...the Pan-African orogeny (e.g. Teklay et al. 1998; Asrat et al. 2001). The WI volcanic succession consists |  | Rapprich, V., Janoušek, V., Hroch, T., Míková, J., Erban, V., Legesa, F., Pécskay, Z., Halodová, P. (2023) Eruptive and magmatic evolution of North Chamo Volcanic Field (southern Ethiopia) Journal of GEOsciences, 68 (1) 3-24 | Journal (article/letter/editorial) | | evolution of North Chamo Volcanic Field (southern Ethiopia) Vladislav RAPPRICH1*, Vojtěch JANOUŠEK1, Tomáš...Geological Survey of Ethiopia, Gurd Shola, P.O. Box 2302, Addis Ababa, Ethiopia 3 Isotope Climatology...37.6°E Abaya Arba Minch VR021 TH615 6.0°N Ethiopia Tosa Sucha VR027 Kale Korke VR020 Study area...MORB-producing ocean-spreading centre in the northerly Afar region (e.g., Barrat et al. 2003). Individual evolutionary...the Ganta scoria cone exposed in the temporary quarry: trachytic pumice (T) overlain by trachyandesitic |  | | Report (chapter) | | geochronologic information about the magma source region. The chemistry of zircon, sphene, and quartz can...temperatures obtained elsewhere in the Yosemite region (Miller et al. 2007). Klimm et al. (2008) have...and older metavolcanics units in the Cinko Lake region of Yosemite National Park (Foley et al. 2007)....2001; Stein and Dietl 2001; Percival et al. 2002, Asrat et al. 2004; Janousek et al. 2004; zhang et al....emplacement of 14 Mesozoic plutons in the Mojave Desert region of southern California (Anderson 1996) to the Cretaceous |  | | Journal (article/letter/editorial) | | September 2012) Felsic intrusions in the Hannan region at the northwestern margin of the Yangtze Block... 2002b, 2006; Zhao et al. 2011). In the Hannan region at the northwestern margin of the Yangtze Block...compositions of the four felsic intrusions in the region, in order to decipher their petrogenesis, melting...Yangtze Block is bounded by the Tibetan Plateau to the west and is separated from the North China Craton by...al. 1999). Mesoproterozoic strata in the western region of the Yangtze Block are dominated by low-grade |  | Ebinger, Cynthia, Ayele, Atalay, Keir, Derek, Rowland, Julie, Yirgu, Gezahegn, Wright, Tim, Belachew, Manahloh, Hamling, Ian (2010) Length and Timescales of Rift Faulting and Magma Intrusion: The Afar Rifting Cycle from 2005 to Present. Annual Review of Earth and Planetary Sciences, 38. 439-466 doi:10.1146/annurev-earth-040809-152333 | Journal (article/letter/editorial) | | Astronomy, Addis Ababa University, Addis Ababa, Ethiopia 3 School of Earth and Environment, University...Sciences, Addis Ababa University, Addis Ababa, Ethiopia Annu. Rev. Earth Planet. Sci. 2010. 38:439–66...petrologic studies from the subaerial Red Sea rift in Ethiopia where a major rifting episode commenced in September... EA38CH17-Ebinger ARI 29 March 2010 14:31 a Rift zone processes Time (year) 102 Inter-rifting: stress/magma...alters our perception of rates and scales of rift zone deformation. The rifting episode occurred in a site |  | | Journal (article/letter/editorial) | | Quartz solubility in the two-phase and critical region of the NaCl–KCl–H2O system: Implications for submarine...R. RENNE : Age calibration of the Fish Canyon sanidine Ar/ Ar dating standard using primary K–Ar standards...volcanic-front to rear-arc region of the Southern Kamchatkan subduction zone: Evidence for the transition...in sediments from the Chilean coastal upwelling region . . . . . 1513 A. BENTHIEN, I. ZONDERVAN, A....Plume–lithosphere interaction beneath Mt. Cameroon volcano, West Africa: Constraints from 238U–230Th–226Ra and Sr–Nd–Pb |  | | Report (issue) | | n og Cover: Photograph of Lake Tahoe looking west to California from Sand Harbor, Nevada. Photograph...human development and climatic variability in the region. Mexico’s (and Mesoamerican) cultural development...climatic trends during the Late Holocene in this region can be summarized as follows: (1) a trend to dryer...correlation extends the Wilkins Peak Member into a region directly adjacent to the Uinta Uplift. Calcite-rich...47 Ma at a velocity of ~6 cm/yr. Single crystal sanidine 40Ar/39Ar ages for Elko Formation ash beds indicate |  | | Report (volume) | | EDITED BY G. YIRGU University of Addis Ababa, Ethiopia CoAEBINGER Royal Holloway, University of London...560-2652 E-mail bookstore @aapg.org Affiliated East-West Press Private Ltd, Marketing Division, G-1/16 Ansari...Resources and Environment’ held in Addis Ababa, Ethiopia, in June 2004. At this meeting, organized by the...research outcomes from Northern Main the recent Ethiopia Afar Geoscientific Lithospheric Experiment undertaken...University of Addis Ababa, PO Box 176, Addis Ababa, Ethiopia (e-mail: yirgu.g @ geol.aau.edu.et) "Department |  | | Book (edition) | | hidden by a nebular disc of material (diagonal dark region) similar in mass and size to the one that formed...layer, but toward its base is a 5 km to 40 km-thick zone with ultralow seismic velocities, which undoubtedly...hot spots such as Hawaii have their source in this zone. The upper mantle is bounded on its lower side by...by the 660 km seismic discontinuity. The region between this depth and another prominent discontinuity...discontinuity at 410 km is called the transition zone (Fig. 1.5(B)). Above this is the uppermost mantle, which terminates |  | | Book (edition) | | hidden by a nebular disc of material (diagonal dark region) similar in mass and size to the one that formed...layer, but toward its base is a 5 km to 40 km-thick zone with ultralow seismic velocities, which undoubtedly...hot spots such as Hawaii have their source in this zone. The upper mantle is bounded on its lower side by...by the 660 km seismic discontinuity. The region between this depth and another prominent discontinuity...discontinuity at 410 km is called the transition zone (Fig. 1.5(B)). Above this is the uppermost mantle, which terminates |  | | Book | | Yilmaz (Eds.) Climate Extremes Simon Wang (Ed.) Fault Zone Dynamic Processes Marion Thomas (Ed.) Flood Damage...sections exposed at the surface (e.g., Ivrea‐ Verbano zone, southern Alps; Fountain & Salisbury, 1981; 14...Volcano, Hawaii, magmatism: Petrology of summit‐ region leucocratic xenoliths. Journal of Petrology, 42...1029/91JB00940. Frey, F. A., Wise, W. S., Garcia, M. O., West, H., Kwon, S. T., & Kennedy, A. (1990). Evolution...midcrustal and lower crustal rocks of the Ivrea‐Verbano zone and Serie dei Laghi, NW Italy. Journal of Geophysical |  | | Report (issue) | | body is characterised by a unique maglnatic breccia zone which comprises a heterogeneous matrix and fragments...celebrations of Geological Survey of India, the Southern Region was assigned the responsibility of organising a...GOLD IN PURULIA, BANKURA AND M EDINIPUR DISTRIC TS, WEST BENGAL ---S. K. BISWAS, K. K. GANGAPADYAY, S. CHATTOPADHYAY...TALS IN THE NIDAR OPHIOLITE OF THE INDUS SU TURE ZONE, EASTERN LADAKH , HIMALAYA, INDIA 465 --- N Sn�'l...PONDICHERRY AND KERALA SOME ALKALINE COMPLEXES OF WEST BENGAL ORISSA AND ANDHRA PRADESH - POTENTIAL HOSTS |
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