 | | Journal (article/letter/editorial) | | Constraints from the Basal Complex of the Austurhorn Intrusion (SE Iceland) DEPARTMENT OF EARTH SCIENCES, INSTITUTE...ACCEPTED JULY 14, 2014 TheTertiary Austurhorn intrusive complex in SE Iceland represents an exhumed magma chamber...magma mixing and mingling.The basal part of the intrusion consists predominantly of granophyres that have...association of granophyres, basic and hybrid rocks at Austurhorn is referred to in the literature as a ‘net-veined’...formation of different generations of hybrid rocks at Austurhorn. The complexity of the mixing and mingling processes |  | | Journal (article/letter/editorial) | | thin basaltic intrusive sheets in south-eastern Iceland consist in cross-section of a porphyritic central... Within the porphyritic zone phenocrysts of plagioclase, augite and olivine are arranged in two main...main layers, an upper layer containing mostly plagioclase phenocrysts, and a lower layer containing concentrations...basaltic intrusive sheets in the Austurhorn area of southeastern Iceland (Fig. 1) are characterized in cross-section...phenocrysts of plagioclase, augite and olivine arranged in two main layers, an upper of mostly plagioclase phenocrysts |  | | Journal (article/letter/editorial) | | Maelifell caldera, Alftafjordur volcano, south-eastern Iceland D. H. BLAKE (Plate 27) SUMMARY. The 'Maelifell...given to a separate collapse area situated on the southern margin of the main caldera of the Tertiary Alftafjordur...centres (Fig. 1) that have been mapped in eastern Iceland (Walker, 1963; Blake, 1964 unpublished Ph.D. thesis...forms the core of the Alftafjordur and the Austurhorn intrusion (Fig. 1; Plate la). It is composed basalt...granophyre and intermediate hybrid rocks of the Austurhorn intrusion (Cargill, Hawkes& Ledeboer, 1928; Blake |  | | Journal (article/letter/editorial) | | central volcanic systems of Iceland: constraints from layered gabbro of the Austurhorn intrusive complex Sigurjon...largest gabbro outcrop in Iceland, the Hvalnesfjall gabbro of the 6–7 Ma Austurhorn intrusive complex, have...variation is limited (Mg# clinopyroxene 72–84; An% plagioclase 56–85), the melanocratic bases display spikes...others show little variation. Two populations of plagioclase crystals (large, An-rich and small, less An-rich)...An-rich) indicate that the recharge magma carried plagioclase xenocrysts (high An-type). The lack of evolved |  | Padilla, A. J., Miller, C. F., Carley, T. L., Economos, R. C., Schmitt, A. K., Coble, M. A., Wooden, J. L., Fisher, C. M., Vervoort, J. D., Hanchar, J. M. (2016) Elucidating the magmatic history of the Austurhorn silicic intrusive complex (southeast Iceland) using zircon elemental and isotopic geochemistry and geochronology. Contributions to Mineralogy and Petrology, 171 (8) doi:10.1007/s00410-016-1279-z | Journal (article/letter/editorial) | | magmatic history of the Austurhorn silicic intrusive complex (southeast Iceland) using zircon elemental...Heidelberg 2016 Abstract The Austurhorn intrusive complex (AIC) in southeast Iceland comprises large bodies...Roy M. Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX, USA model temperatures...constructed by multiple short-lived magmatic intrusion events occurring closely spaced in time, allowing...13 69 Page 2 of 21 Keywords Iceland · Silicic magmatism · Austurhorn · Zircon · Geochemistry · Isotopic |  | | Journal (article/letter/editorial) | | anticipated the occurrence of this last type of intrusion on the grounds that extensive ponding of basaltic...led to the concept of a mafic-silicic layered intrusion (MASLI) and the currently known range of occurrences...and Gasquet 1994 Cordillera del Paine pluton, southern Chile (Tertiary) Michael 1991; Leuthold et al...1992b Sazava intrusion, Czech Republic (Paleozoic) Janousek et al. 2004 Gesiniec intrusion, Poland (Paleozoic)...Lindline et al. 2004 Rattlesnake Mountain Pluton, southern California (Mesozoic) MacColl 1964a Diorite of |  | | Journal (article/letter/editorial) | | of Evolved Basalts and Rhyolites at Austurhorn, Southeastern Iceland: the Role of Fractional Crystallization...April 1992) ABSTRACT The Austurhorn intrusive complex in southeastern Iceland represents the evolved hypabyssal...volcano. The complex consists of a layered gabbro intrusion, a composite granophyric stock, and abundant mafic...the genesis of evolved basalts and rhyolites in Iceland that are difficult to infer from studies of only...Major and trace element variations throughout the Austurhorn suite are consistent with fractional crystallization |  | | Journal (article/letter/editorial) | | AMSTERDAM K-Ar AGES OF THE OLDEST EXPOSED ROCKS IN ICELAND S. MOORBATH Department of Geology and Mineralogy...The University Research Institute, Reyk/avik, Iceland and R. GOODWIN Department of Geology and Mineralogy...oldest exposed lavas in Iceland. The mean values are 12.5 + 0.2 m.y. for eastern Iceland and 16.0 4- 0.3 m...m.y. for northwestern Iceland, or Middle Miocene. The significance of these ages is discussed in relation...production. Several additional age determinations from Iceland are presented which supplement and confirm previously |  | | Journal (article/letter/editorial) | | glasses from the Askja volcanic system, North Iceland M.E. Hartley a,b,⇑, T. Thordarson a,c, J.G. Fitton...Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavı́k, Iceland d Edinburgh Ion Microprobe...crystallisation. Oxygen isotope ratios in olivine- and plagioclase-hosted melt inclusions and glasses from tephra...magma supply and storage between the northern and southern segments of the Askja volcanic system. Melt inclusions...subject of some debate. Nominally fresh basalts from Iceland vary in d18 O between +2.1& and +6.3& (Hémond |  | | Journal (article/letter/editorial) | | Thirteen million years of silicic magma production in Iceland: Links between petrogenesis and tectonic settings...Institute of Earth Sciences, University of Iceland, 101 Reykjavik, Iceland a r t i c l e i n f o Article history:...Off-axis volcanism Iceland a b s t r a c t The origin of the Quaternary silicic rocks in Iceland is thought...consistent model for silicic magma formation in Iceland and to constrain the link between tectonic settings...Rift Zone, between 7 and 5.5 Ma. In the South Iceland Volcanic Zone (SIVZ), the intermediate Nd-signature |  | | Journal (article/letter/editorial) | | com/locate/epsl Crustal accretion under northern Iceland J. Maclennan a; *, D. M c Kenzie a , K. Gronvo«ld...Institute, Grensasvegur 50, IS-108 Reykjavik, Iceland c Amerada Hess Limited, 33 Grosvenor Place, London...volcanic systems of the Northern Volcanic Zone of Iceland show two distinct trends. The compositional variation...in the crust and shallow mantle under northern Iceland to be made and these estimates can be used to predict...northern Iceland. ß 2001 Elsevier Science B.V. All rights reserved. Keywords: igneous rocks; Iceland; Kra£a; |  | | Journal (article/letter/editorial) | | et al. (2017) present the concept of periodic intrusion of basal magma flows and lateral mixing as the...double-diffusive convection (Irvine et al., 1983), intrusion of fresh magma into a PGE-enriched resident magma...sill-like nature of the peridotite layers in the Rum Intrusion, as well as the thermal alteration of the intercalated...supported by electron microprobe analyses of the plagioclase and Cr-spinel, as well as by whole-rock data...the Main Zone might have been emplaced prior to intrusion of the Merensky-Bastard interval as a way of solving |  | Mezger, Klaus, Altherr, Rainer, Okrusch, Martin, Henjes-Kunst, Friedhelm, Kreuzer, Hans (1985) Genesis of acid/basic rock associations: a case study The Kallithea intrusive complex, Samos, Greece. Contributions to Mineralogy and Petrology, 90 (4) 353-366 doi:10.1007/bf00384714 | Journal (article/letter/editorial) | | each other, most of which indicate that multiple intrusion was the main process responsible for the association...Such structures m a y have originated by the intrusion o f an acid melt into a basic magma. However,...rock type in the dikes. The rocks consist of plagioclase, biotite, hornblende, K-feldspar, and quartz...microdiorites contain patches which consist of plagioclase and minor K-feldspar surrounding hypidiomorphic...307 0.669 0.389 0.535 Besides K-feldspar, plagioclase, and quartz, these rocks consist of biotite, |  | | Journal (article/letter/editorial) | | composed of amphibole (10-40 %), biotite (5-30 %), plagioclase (30-60 %) and quartz (5-10 %). They have low...fractionated I-type granites that are composed of plagioclase (10-25 %), quartz (30-40 %), K-feldspar (15-20%)...Neoproterozoic arc-affinity mafic rocks in the region, suggesting that the Lantian granites were derived...other 820 Ma intermediate to felsic rocks in the region (Li et al., 2003; Chen et al., 2014), a revised...the Dongma dioritic intrusion that emplace into the Sibao Group. The Jiuling intrusion in the Jiangxi Province |  | | Journal (article/letter/editorial) | | consists of an old metamorphic complex occupying the southern half of the island and a younger igneous complex...melanocratic, consisting of equant amphiboles and plagioclase with minor amounts of quartz and variable amounts...grained varieties, with amphiboles larger than plagioclase, are developed around low-water mark at Grand...structures, some of the amphiboles are ‘cored’ with plagioclase (Figure 2c) in a manner similar to that figured...fractionated hornblende and plagioclase from 50-55 per cent Si02 and hornblende, plagioclase and biotite from 55-58 |  | | Book (edition) | | org/details/iceland000Othor Classic Geology in Europe 3 iceland CLASSIC GEOLOGY IN EUROPE Italian Volcanoes Chris...Auvergne Peter Cattermole ISBN: 9781903544051 (2001) Iceland Thor Thordarson & Armann Héskuldsson ISBN: 9781780460215...Europe 3 Iceland Second Edition Thor Thordarson Faculty of Earth Sciences, University of Iceland Armann...Hoskuldsson Institute of Earth Sciences, University of Iceland | DUNEDIN EDINBURGH @ LONDON ) Published by...Introduction Xi Travel in Iceland xiv; Pronunciation xv The geology of Iceland Introduction 1; Geological |  | Batki, Anikó, Pál-Molnár, Elemér, Jankovics, M. Éva, Kerr, Andrew C., Kiss, Balázs, Markl, Gregor, Heincz, Adrián, Harangi, Szabolcs (2018) Insights into the evolution of an alkaline magmatic system: An in situ trace element study of clinopyroxenes from the Ditrău Alkaline Massif, Romania. Lithos, 300. 51-71 doi:10.1016/j.lithos.2017.11.029 | Journal (article/letter/editorial) | | Săndulescu, 1984) of the Alpine– Carpathian–Dinaric region (Fig. 1a) and intrudes the Variscan metamorphic...vol.%), up to 16 vol.% clinopyroxene, ~5 vol.% plagioclase, NU ~5 vol.% apatite, ~3 vol.% titanite, and...of amphibole (44 vol.%), biotite (11 vol.%), plagioclase (35 vol.%), subordinate ACCEPTED MANUSCRIPT...potassium feldspar (80 vol.%), subordinate ED plagioclase (11 vol.%), and rarely, clinopyroxene. Accessory...minerals are clinopyroxene, amphibole, biotite and plagioclase. Texturally, subhedral to anhedral clinopyroxene |  | Xiong, Fuhao, Ma, Changqian, Chen, Bing, Ducea, Mihai N., Hou, Mingcai, Ni, Shijun (2019) Intermediate-mafic dikes in the East Kunlun Orogen, Northern Tibetan Plateau: A window into paleo-arc magma feeding system. Lithos, 340. 152-165 doi:10.1016/j.lithos.2019.05.012 | Journal (article/letter/editorial) | | fine-grained and made up of amphibole (30–35 vol%), plagioclase (25–30 vol%), pyroxene (5–10 vol%), and CE ...fine-grained matrix AC (Fig. 2e) of subhedral plagioclase (40–45 vol%), clinopyroxene (10–15 vol%), and...amphibole (20–25 vol%), and they have phenocrysts of plagioclase (~10 vol%), pyroxene (~3 vol%), and amphibole...euhedral plagioclase and amphibole phenocrysts set in a matrix of fine-grained plagioclase and amphibole...but lack plagioclase phenocrysts, ACCEPTED MANUSCRIPT while others have mainly plagioclase phenocrysts |  | | Journal (article/letter/editorial) | | inclusions contain a variety of foreign materials: plagioclase, olivine, and clinopyroxene of basaltic origin;...clinopyroxene, olivine, F e - T i oxides, quartz, and plagioclase of rhyolitic origin (Fig. 1A); and basaltic...basaltic clinopyroxene+orthopyroxene_olivine+plagioclase occur in some aphyric inclusions; basaltic clinopyroxene...of typical inclusions. Microprobe analyses of plagioclase phenocrysts within droplets from porphyritic...grained, intergranular or felty, and composed of plagioclase+clinopyroxene+amphibole + magnetite + ilmenite_ |  | Cambeses, A., Montero, P., Molina, J.F., Hyppolito, T., Bea, F. (2019) Constraints of mantle and crustal sources and interaction during orogenesis: A zircon SHRIMP U-Th-Pb and O isotope study of the ‘calc-alkaline’ Brovales pluton, Ossa-Morena Zone, Iberian Variscan Belt. Lithos, 324. 661-683 doi:10.1016/j.lithos.2018.11.037 | Journal (article/letter/editorial) | | profile across the northern SPZ, PLZ, OMZ and southern CIZ (Fig. 1A; Simancas et al., 2003). The IRB...dioritic enclaves contain biotite, amphibole and plagioclase (Fig. 4B) with apatite, zircon and magnetite...0.24-0.33 wt % (Supplementary Material II). Plagioclase, 40-60 vol. %, forms subhedral tabular crystals...finer-grained diorite enclave has oligoclase plagioclase T An25-40 SC RI P composition, An24-30 (Fig... which often include biotite, amphibole and plagioclase (Fig. 4A). NU 3.2.2 Intermediate Unit The |  | Zhu, Yu, Lai, Shaocong, Qin, Jiangfeng, Zhu, Renzhi, Zhang, Fangyi, Zhang, Zezhong (2019) Geochemistry and zircon U–Pb–Hf isotopes of the 780 Ma I-type granites in the western Yangtze Block: petrogenesis and crustal evolution. International Geology Review, 61 (10) 1222-1243 doi:10.1080/00206814.2018.1504330 | Journal (article/letter/editorial) | | rocks, and adakitic rocks in the Panzhihua–Yanbian region along the southwestern margin of Yangtze Block...medium grained (Figure 3a). They are composed of plagioclase (30–35%), quartz (20–25%), K-feldspar (10–15%)...3d) and mainly consist of K-feldspar (25–30%), plagioclase (22–27%), quartz (30–35%), hornblende (2–5%)...the Yangtze Block. Mineral abbreviations: Pl: plagioclase; Kfs: K-feldspar; Qtz: quartz; Hbl: hornblende;...et al. 2009) (Table 1). In the Kangding–Mianning region, the ca. 850–800 Ma depleted-mantle-derived Baoxing |  | Sami, Mabrouk, Adam, Munir M. A., Lv, Xinbiao, Lasheen, El Saeed R., Ene, Antoaneta, Zakaly, Hesham M. H., Alarifi, Saad S., Mahdy, Nasser M., Abdel Rahman, Abdel Rahman A., Saeed, Adil, Farahat, Esam S., Fathy, Douaa, Ali, Shehata (2023) Petrogenesis and Tectonic Implications of the Cryogenian I-Type Granodiorites from Gabgaba Terrane (NE Sudan) Minerals, 13 (3) 331 doi:10.3390/min13030331 | Journal (article/letter/editorial) | | granitoids, especially those that occupied the southern parts of the Gabgaba Terrane. Recently, Saeed...melting of subductionmodified materials. In the southern tip of the Gabgaba Terrane (Haweit area), older...belongs to the Gabgaba Terrane and located in the southern part of the HSZ (Figure 1B). The area is covered...widely distributed in many countries located in the region surrounding the Red Sea, including Sudan, Yemen...succession of multicolored gneisses, followed by the intrusion of basic and intermediate rocks. A series of syn- |  | | Journal (article/letter/editorial) | | similar to those of the Xiong’er Group in the southern margin of the North China Craton (NCC), Journal...setting The eastern Qinling orogen comprises the southern margin of the NCC to the al north and the Qinling...rn Luonan-Luanchuan Fault (LLF) (Fig.1). The southern margin of the NCC is bounded Jo u by the Sanmenxia-Lushan...volcanic-dominated rocks are a distinct geological unit on the southern margin of the NCC with an area of more than 60...across the eastern Qinling orogen revealed that the southern margin of the NCC have Journal Pre-proof underthrusted |  | Shruti, V.C., Jonathan, M.P., Rodríguez-Espinosa, P.F., Nagarajan, R., Escobedo-Urias, D.C., Morales-García, S.S., Martínez-Tavera, E. (2017) Geochemical characteristics of stream sediments from an urban-volcanic zone, Central Mexico: Natural and man-made inputs. Geochemistry, 77 (2) 303-321 doi:10.1016/j.chemer.2017.04.005 | Journal (article/letter/editorial) | | of sand and silt sized particles dominated by plagioclase, pyroxenes, amphiboles, K-feldspar, biotite,...to moderate weathering conditions in the source region. Based on the provenance discrimination diagrams...to felsic volcanic rocks dominated in the study region. Metal contamination indices highlight the enrichment...depositional environment and sources of pollution in the region (Calvert et al., 2001; Glasby et al., 2004; Naimo...2.2. Geological setting Geologically, Tlaxcala region belongs to “Tlaxcala Block” consisting of Tertiary |  | | Report (chapter) | | the mostly small intrusions, including coherent-intrusion complexes, that occur in and under the volcanic...anomalies that are attributed to cumulates and intrusion complexes; the structures of basaltic lava flows;...fields overlapping in time and space occur in Iceland. The basalts erupted from rift zones typically...(Higgins 1973; Chitwood 1990). Jebel Kariz in southern Arabia is a fine example of a central volcano...of the more productive flood-basalt fields in Iceland are about an order of magnitude lower. Most stratovolcanoes |
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