Gotowe bibliografie tematyczne / Intrusions (Geology)

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Gotowa bibliografia na temat „Intrusions (Geology)”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 29 lipca 2024

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Artykuły w czasopismach na temat "Intrusions (Geology)"

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THÓRARINSSON, SIGURJÓN B., PAUL M. HOLM, SEBASTIAN TAPPE, LARRY M. HEAMAN i NIELS-OLE PRÆGEL. "U–Pb geochronology of the Eocene Kærven intrusive complex, East Greenland: constraints on the Iceland hotspot track during the rift-to-drift transition". Geological Magazine 153, nr 1 (3.07.2015): 128–42. http://dx.doi.org/10.1017/s0016756815000448.

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AbstractSeveral major tholeiitic (e.g. the Skaergaard intrusion) and alkaline (e.g. the Kangerlussuaq Syenite) intrusive complexes of the North Atlantic Large Igneous Province are exposed along the Kangerlussuaq Fjord in East Greenland. The Kærven Complex forms a satellite intrusion to the Kangerlussuaq Syenite and includes early tholeiitic gabbros and a series of cross-cutting alkaline intrusions ranging from monzonite to alkali granite. The alkaline intrusions cut the gabbros, and are cut by the outer nordmarkite zone of the Kangerlussuaq Syenite. This study presents the first U–Pb zircon ages from the alkaline units of the Kærven Complex. Fourteen multi-grain zircon fractions have been analysed by thermal ionization mass spectrometry (TIMS). Absolute age differences could not be resolved between the different units, suggesting a relatively rapid succession of intrusions betweenc. 53.5 and 53.3 Ma. Our compilation of precise radiometric age data shows that most of the alkaline magmatism in the Kangerlussuaq Fjord occurred prior to 50 Ma. Moreover, pre-50 Ma alkaline intrusions and lavas show a SSE-younging trend, which is interpreted as the track of the Iceland hotspot during the rift-to-drift transition of the North Atlantic.
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O'Driscoll, B. "The Centre 3 layered gabbro intrusion, Ardnamurchan, NW Scotland". Geological Magazine 144, nr 6 (21.09.2007): 897–908. http://dx.doi.org/10.1017/s0016756807003846.

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AbstractDetailed remapping of the Palaeogene Ardnamurchan Centre 3 gabbros, NW Scotland, suggests that this classic sequence of ring-intrusions forms a composite layered lopolith. The area mapped by previous studies as the Great Eucrite gabbro intrusion comprises 70% by area of Centre 3. Field observations suggest that most of the other smaller ring-intrusions of Centre 3 (interior to the Great Eucrite) constitute either distinct petrological facies of the same intrusion, or included country-rock or peridotite blocks. These observations, together with syn-magmatically deformed inward-dipping modal layering, are used here to support the interpretation that significant central sagging occurred in the intrusion at a late stage in its crystallization history.
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Canhimbue, Ludmila, i Irina Talovina. "Geochemical Distribution of Platinum Metals, Gold and Silver in Intrusive Rocks of the Norilsk Region". Minerals 13, nr 6 (24.05.2023): 719. http://dx.doi.org/10.3390/min13060719.

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The Norilsk ore district is one of the world leaders in the production of platinum metals. Long-term research focused on the detection of sulfide platinum-copper-nickel ores contributed to the accumulation of a large volume of scientific material on the geology and mineralization of the Norilsk area. Despite this, the issue of the composition of the initial melt for ore-bearing intrusive complexes and its degree of enrichment with noble metals remains open. Intrusive rocks of the Norilsk region are rarely analyzed for their ratio of noble metals. However, the analysis and comparison of geochemical parameters of different types of intrusions allows us to draw important conclusions not only about the composition of the initial magmas of ore-bearing complexes, but also about the formation conditions of the intrusions. This study demonstrates the distribution of platinum metals, gold and silver in the main petrographic differentiates of the Kharaelakh, Talnakh, Vologochan intrusions and Kruglogorsk-type intrusion. The regularities and variations of the distribution of metals depend on the host rocks. There are two series of rocks in the inner structure of the ore-bearing intrusions: 1. Picritic and taxitic gabbro-dolerites enriched in PGE-Au-Ag mineralization which forms disseminated ores at intrusion bottoms (ore-bearing rocks). 2. Olivine-, olivine-bearing, olivine-free gabbro-dolerites and leucogabbro with poor sulfide mineralization at the upper part of the intrusions (ore-free rocks). There is a distinct correlation between PGE, Cu, S and to a lesser extent correlation with Ni in the first rock group, which is a characteristic of sulfide PGE-Cu-Ni deposits. In the second group, correlations are also revealed, but the correlation coefficients are lower. The main element controlling the distribution of platinum metals is copper. The taxitic gabbro-dolerites of the Talnakh intrusion are the most enriched by noble metals. According to noble metal patterns the rocks of the Kharaelakh intrusion show the highest degree of melting of the initial mantle material during the formation of parental magmas chambers. Despite some differences, the geochemical features of the studied rocks indicate the similar characteristics of the accumulation of gold, silver and platinum metals in the intrusions of the Talnakh, Kruglogorsk and Zubovsk types, which allow suggesting the close conditions for the formation of ore mineralization of these intrusions.
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Kovacs, Marinel, Zoltán Pécskay, Alexandrina Fülöp, Maria Jurje i Oscar Edelstein. "Geochronology of the Neogene intrusive magmatism of the Oaș—Gutâi Mountains, Eastern Carpathians (NW Romania)". Geologica Carpathica 64, nr 6 (1.12.2013): 483–96. http://dx.doi.org/10.2478/geoca-2013-0033.

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Abstract Earlier geological work in the Oaș-Gutâi Mts (OG), Eastern Carpathians, has revealed the extensive presence of shallow subvolcanic intrusive bodies, both exposed on the surface and covered by Paleogene-Neogene sedimentary sequences and Neogene volcanic formations. This study is based on detailed mapping and sampling of the OG Neogene intrusive magmatic rocks. Thirty seven representative intrusions (sills, dykes, microlaccoliths, etc.) were selected for radiometric dating. These intrusions show a wide variety of petrographic rock-types: from microgabbros to microgranodiorites and from basalts to andesites. However, the intrusions consist of typical calc-alkaline, medium-K rocks, similar to the volcanic rocks which outcrop in the same areas. The K-Ar age determinations on whole-rock samples of intrusions yielded ages between 11.9 Ma and 7.0 Ma (from Late Sarmatian to Middle Pannonian). The results are in good agreement with the common assumption, based on the biostratigraphic and geological data, that large volumes of intrusions have formed during the paroxysm of the intermediate volcanic activity in the OG. Except for the Firiza basalt intrusive complex of the Gutâi Mts (8.1-7.0 Ma), the OG intrusions show similar K-Ar ages as the intrusions of the “Subvolcanic Zone” and Călimani Mts from Eastern Carpathians. The timing of the OG intrusive magmatism partially overlaps with the timing of the intrusive magmatic activity in the Eastern Moravia and Pieniny Mts. The systematic radiometric datings in the whole OG give clear evidence that the hydrothermal activity related to the epithermal systems always postdates intrusion emplacement.
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Makkonen, Hannu V., i Pekka Tuisku. "Geology and crystallization conditions of the Särkiniemiintrusion and related nickel-copper ore, central Finland – implications for depth of emplacement of 1.88 Ga nickel-bearing intrusions". Bulletin of the Geological Society of Finland 92, nr 2 (15.12.2020): 111–30. http://dx.doi.org/10.17741/bgsf/92.2.003.

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Several Ni-Cu deposits occur within the Kotalahti area, central Finland, in proximity to an Archaean gneiss dome surrounded by a Palaeoproterozoic craton-margin supracrustal sequence comprising quartzites, limestones, calc-silicate rocks, black schists and banded diopside amphibolites. The geology of the area and age of the Ni-bearing intrusions (1.88 Ga) are similar to the Thompson Ni belt in the Canadian Trans-Hudson Orogen. The small mafic-ultramafic and Ni-Cu -bearing Särkiniemi intrusion, closely associated with the Archaean basement core of the Kotalahti Dome, is composed of a western peridotite and eastern gabbro body, both of which are mineralized. The eastern gabbro has a contact aureole several meters thick, consisting of orthopyroxene +/- cordierite bearing hornfels between the intrusion and the migmatites. Geochemically, the Särkiniemi intrusion shares many features in common with other Svecofennian mafic-ultramafic intrusions, including crustal contamination and nickel depletion. The related Ni-Cu deposit has a low Ni/Co value (15) and low nickel content in the sulphide fraction (2.8 wt.%), together with a low estimated magma/sulphide ratio of around 170. Svecofennian 1.88 Ga mafic-ultramafic intrusions occur in terrains of variable metamorphic grade (from low-amphibolite to granulite facies) and are likely to represent emplacement at different crustal depths. Multi-equilibrium thermobarometry indicates that the contact aureole at Särkiniemi reached equilibrium at pressures of 4.5–6 kbar (15–20 km depth) and temperatures of 600–670 °C. Combined with the results of earlier research on the Svecofennian intrusions, this study indicates that a depth of 15–20 km crustal level was favourable, along with other critical factors, for nickel sulfide deposition at 1.88 Ga.
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Krivolutskaya, Nadezhda, Sheida Makvandi, Bronislav Gongalsky, Irina Kubrakova i Natalia Svirskaya. "Chemical Characteristics of Ore-Bearing Intrusions and the Origin of PGE–Cu–Ni Mineralization in the Norilsk Area". Minerals 11, nr 8 (28.07.2021): 819. http://dx.doi.org/10.3390/min11080819.

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The composition of the parental magmas of Cu–Ni deposits is crucial for the elucidation of their genesis. In order to estimate the role of magma in ore formation, it is necessary to compare the compositions of silicate rock intrusions with different mineralization patterns, as observed in the Norilsk region. The rock geochemistry of two massifs located in the same Devonian carbonate rocks—the Kharaelakh intrusion, with its world-class platinum-group element (PGE)–Cu–Ni deposit, and the Pyasinsky-Vologochansky intrusion, with its large deposit—was studied. Along with these massifs, the Norilsk 2 massif with noneconomic mineralization intruded in the Ivakinskaya-Nadezhdinskaya basalts was studied as well. Their settings allow the estimation of the parental magma composition, taking into account the possible assimilation of host rocks. Analyses of 39 elements in 97 samples demonstrated the similarity of the intrusions in terms of their major components. The Pyasinsky-Vologochansky intrusion contains the highest trace element contents compared with the Kharaelakh and Norilsk 2 massifs, evidencing its crystallization from evolved parental magma. No influence of host rocks on the silicate rock compositions was found, except for narrow (1–2 m) endo-contact zones. There is no correlation between the mineralization volume and the rock compositions of the studied intrusions. It is assumed that the intrusions were formed from one magma crustal source irregularly rich in sulfur (S). This source inhomogeneity in terms of the sulfur distribution resulted in deposits of varying sizes. The magmas served as a transporting agent for sulfides from deep zones to the surface.
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Hart, Thomas Robert, i Carole Anne MacDonald. "Proterozoic and Archean geology of the Nipigon Embayment: implications for emplacement of the Mesoproterozoic Nipigon diabase sills and mafic to ultramafic intrusions". Canadian Journal of Earth Sciences 44, nr 8 (1.08.2007): 1021–40. http://dx.doi.org/10.1139/e07-026.

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The Nipigon Embayment is underlain by Archean rocks of the English River, Wabigoon, and Quetico subprovinces, and intruded along the west side by late- to post-tectonic mafic to ultramafic intrusions. The early Mesoproterozoic ultramafic to felsic Badwater intrusion and felsic English Bay Complex are located in the northwest corner of the Nipigon Embayment. Three mafic to ultramafic intrusions, the Disraeli, Seagull, and Hele intrusions, are located south of Lake Nipigon, and the Kitto intrusion is located east of the lake. A number of mafic to ultramafic bodies (Jackfish (Island), Shillabeer, Kama Hill, Nipigon Bay) have only limited outcrops. The gabbroic Nipigon diabase sills intrude all other rocks in the Nipigon Embayment and generally have a consistent mineralogy and geochemistry, except for the Inspiration sill(s) and the McIntyre Sill. Geological and geophysical data suggest emplacement of the ultramafic intrusions by mechanisms similar to those controlling emplacement of the saucer-shaped diabase sills. These mechanisms are partially dependent on a series of pre-existing north-, northwest-, and northeast-trending faults formed prior to Keweenawan magmatism. The presence of sills, rather than dykes, indicates that the Nipigon Embayment was not extensional during the Keweenawan Midcontinent Rift, suggesting that the Nipigon Embayment is not a classic failed arm.
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Milner, Simon C., Anton P. Le Roex i Ronald T. Watkins. "Rb-Sr age determinations of rocks from the Okenyenya igneous complex, northwestern Namibia". Geological Magazine 130, nr 3 (maj 1993): 335–43. http://dx.doi.org/10.1017/s001675680002001x.

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AbstractThe Okenyenya igneous complex is one of a suite of intrusions which define a prominent northeast-trending linear feature in Damaraland, northwestern Namibia. Precise Rb–Sr internal isochron ages range from 128.6 ± 1 to 123.4 ± 1.4 Ma for the major phases of intrusion identified within the complex. The tholeiitic gabbros forming the outer rings of the complex, and the later alkali gabbros which form the central hills, cannot be distinguished in terms of Rb–Sr ages, although field relations clearly indicate the younger age of the latter. The intrusionsof nepheline-syenite and essexite comprising the mountain of Okenyenya Bergon the northern edge of the complex give ages of 123.4 ± 1.4 and 126.3 ± 1 Ma, respectively, and form the final major phase of intrusion. The ages obtained for early and late intrusive phases define a minimum magmatic ‘life-span’ of approximately 5 Ma for the complex. The determined age of the Okenyenya igneous complex (129–123 Ma), when taken together with the few reliable published ages for other Damaraland complexes (130–134 Ma), suggests that these sub-volcanic complexes were emplaced contemporaneously with the widespread Etendeka volcanics (˜ 130 Ma), and relate to magmatism associated with the breakup of southern Africa and South America with the opening of the South Atlantic Ocean. The linear distributionof intrusions in Damaraland is interpreted to be due to magmatism resultingfrom the upwelling Tristan plume being focused along a structural discontinuity between the Pan-African, Damaran terrain to the south, and Proterozoiccratonic basement to the north.
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NICOLL, GRAEME R., MARIAN B. HOLNESS, VALENTIN R. TROLL, COLIN H. DONALDSON, EOGHAN P. HOLOHAN, C. HENRY EMELEUS i DAVID CHEW. "Early mafic magmatism and crustal anatexis on the Isle of Rum: evidence from the Am Màm intrusion breccia". Geological Magazine 146, nr 3 (25.03.2009): 368–81. http://dx.doi.org/10.1017/s0016756808005864.

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AbstractThe Rum Igneous Centre comprises two early marginal felsic complexes (the Northern Marginal Zone and the Southern Mountains Zone), along with the later central ultrabasic–basic layered intrusions. These marginal complexes represent the remnants of near-surface to eruptive felsic magmatism associated with caldera collapse, examples of which are rare in the North Atlantic Igneous Province. Rock units include intra-caldera collapse breccias, rhyolitic ignimbrite deposits and shallow-level felsic intrusions, as well the enigmatic ‘Am Màm intrusion breccia’. The latter comprises a dacitic matrix enclosing lobate basaltic inclusions (~1–15 cm) and a variety of clasts, ranging from millimetres to tens of metres in diameter. These clasts comprise Lewisian gneiss, Torridonian sandstone and coarse gabbro. Detailed re-mapping of the Am Màm intrusion breccia has shown its timing of emplacement as syn-caldera, rather than pre-caldera as previously thought. Textural analysis of entrained clasts and adjacent, uplifted country rocks has revealed their thermal metamorphism by early mafic intrusions at greater depth than their present structural position. These findings provide a window into the evolution of the early mafic magmas responsible for driving felsic magmatism on Rum. Our data help constrain some of the physical parameters of this early magma–crust interaction and place it within the geochemical evolution of the Rum Centre.
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Zi, Jian-Wei, Birger Rasmussen, Janet R. Muhling, Wolfgang D. Maier i Ian R. Fletcher. "U-Pb monazite ages of the Kabanga mafic-ultramafic intrusions and contact aureoles, central Africa: Geochronological and tectonic implications". GSA Bulletin 131, nr 11-12 (15.04.2019): 1857–70. http://dx.doi.org/10.1130/b35142.1.

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AbstractMafic-ultramafic rocks of the Kabanga-Musongati alignment in the East African nickel belt occur as Bushveld-type layered intrusions emplaced in metasedimentary sequences. The age of the mafic-ultramafic intrusions remains poorly constrained, though they are regarded to be part of ca. 1375 Ma bimodal magmatism dominated by voluminous S-type granites. In this study, we investigated igneous monazite and zircon from a differentiated layered intrusion and metamorphic monazite from the contact aureole. The monazite shows contrasting crystal morphology, chemical composition, and U-Pb ages. Monazite that formed by contact metamorphism in response to emplacement of mafic-ultramafic melts is characterized by extremely high Th and U and yielded a weighted mean 207Pb/206Pb age of 1402 ± 9 Ma, which is in agreement with dates from the igneous monazite and zircon. The ages indicate that the intrusion of ultramafic melts was substantially earlier (by ∼25 m.y., 95% confidence) than the prevailing S-type granites, calling for a reappraisal of the previously suggested model of coeval, bimodal magmatism. Monazite in the metapelitic rocks also records two younger growth events at ca. 1375 Ma and ca. 990 Ma, coeval with metamorphism during emplacement of S-type granites and tin-bearing granites, respectively. In conjunction with available geologic evidence, we propose that the Kabanga-Musongati mafic-ultramafic intrusions likely heralded a structurally controlled thermal anomaly related to Nuna breakup, which culminated during the ca. 1375 Ma Kibaran event, manifested as extensive intracrustal melting in the adjoining Karagwe-Ankole belt, producing voluminous S-type granites. The Grenvillian-aged (ca. 990 Ma) tin-bearing granite and related Sn mineralization appear to be the far-field record of tectonothermal events associated with collision along the Irumide belt during Rodinia assembly. Since monazite is a ubiquitous trace phase in pelitic sedimentary rocks, in contact aureoles of mafic-ultramafic intrusions, and in regional metamorphic belts, our study highlights the potential of using metamorphic monazite to determine ages of mafic-ultramafic intrusions, and to reconstruct postemplacement metamorphic history of the host terranes.
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Rozprawy doktorskie na temat "Intrusions (Geology)"

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Dupee, Matthew E. "Porphyroblast Kinematics and Crenulation Cleavage Development in the Aureole of the Mooselookmeguntic Pluton, Western Maine". Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/DupeeME2005.pdf.

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Magee, Craig. "Emplacement of sub-volcanic cone sheet intrusions". Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/3042/.

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Sub-volcanic intrusive networks, of which cone sheets are recognised as a major constituent, control volcano growth and eruption style. The accepted cone sheet model is that these confocally dipping intrusions originate from an unexposed central magma chamber through dip-parallel magma flow. However, the emplacement mechanism of cone sheets has remained poorly understood. The classic ~58 Ma cone sheet swarm of Ardnamurchan, NW Scotland, offers an excellent opportunity to further resolve the emplacement dynamics of cone sheets through studying their magma flow. Structural measurements and anisotropy of magnetic susceptibility (AMS) analyses have constrained a lateral magma flow regime, consistently oriented NW-SE, in the majority of the Ardnamurchan cone sheets. This is not consistent with previous emplacement models. In this thesis, it is suggested that emplacement of the Ardnamurchan cone sheets occurred through the deflection of laterally propagating, NW-SE trending regional dykes, sourced from laterally adjacent magmatic systems (likely the Palaeogene Mull central complex). Field observations highlight the importance of host rock structure and interference between locally compressional and regional extensional stress fields in controlling intrusion geometry. Implicitly, edifice construction and potential eruption precursors observed at a volcano may instigate, or result from, magmatic activity in laterally adjacent volcanic systems.
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Szarawarska, Ewa. "Origin of large-scale sandstone intrusions : insights from subsurface case studies and numerical modelling". Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=53388.

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Thesis (Ph.D.)--Aberdeen University, 2009.
With: 3D seismic characterization of large-scale sandstone intrusions in the lower Paleogene of the North Sea: completely injected vs in situ remobilized saucer-shaped sand bodies /E. Szarawarska ...et al. In review, Basin Research. Special Issue. Includes bibliographical references.
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Sarkar, Arindam. "Isotopic geochemistry of mafic intrusions and related sulfide mineralization Uitkomst and Kabanga, Africa and the Lady of the Lake intrusion, Montana /". [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3332475.

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Thesis (Ph.D.)--Indiana University, Dept. of Geological Sciences, 2008.
Title from PDF t.p. (viewed on May 14, 2009). Source: Dissertation Abstracts International, Volume: 69-09, Section: B, page: 5279. Adviser: Edward M. Ripley.
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Al-Jawadi, A. F. "Minor igneous intrusions of the Lake District : geochronology, geochemistry and petrology". Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376308.

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Pattison, Christopher Ian. "Igneous intrusions in the Bowen Basin". Thesis, Queensland University of Technology, 1990. https://eprints.qut.edu.au/35967/1/35967_Pattison_1990.pdf.

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Igneous intrusions, in the form of stocks, sills and dykes are abundant in the Bowen Basin. They are predominantly Early Cretaceous in age, exclusively epizonal in origin and range in composition from dolerite to granodioriteldacite. All rock units within the basin, up to and including the Clematis Group, are intruded to some degree. This study assesses the distribution, form, petrology and mode of emplacement of plutons, igneous sills and dykes occurring in the Bowen Basin, and considers their relationship to the prevailing structure. The tectonic implications of the findings are then assessed. Igneous sills occur in two geographically distinct domains, one in the northern Bowen Basin and the other in the central Bowen Basin. The sills emanated from pre-existing, north to north-northwest trending reverse faults, and preferentially intruded coal seams. The boundaries to sill intrusion are marked by major northeast trending basement structures. These basement structures occur at regular intervals throughout the basin, and correspond with the localisation of plutonic and dyke activity, anomalous structural disturbance, and changes in the gross structure of the basin. They are interpreted as transfer faults that were inherited from an Early Permian, basin-forming extensional episode. Petrological evidence indicates that the plutons and sills occurring in the northern Bowen Basin are petrogenetically related, and that a progressive variation in their chemistry occurs across the axis of the basin from east to west. Intrusions in the east belong to the calc-alka1ine rock suite, while those in the west belong to the syenitic suite. This transition is inte1preted in terms of increased crustal contamination as the magma migrated from a source area to the east along a buried, shallow-dipping detachment surface that extends under the basin. This detachment was inherited from the above mentioned extensional phase and is intimately linked to structures that penetrate up-section through the basin succession. Reactivation of the transfer faults during the Early Cretaceous initiated the emplacement of dykes, and the synchronous development of northeast trending normal and wrenchstyle faults. The dykes exhibit characteristics that indicate they were self-propagating, and can be regarded as good palaeostress indicators. This phase corresponded with a major compressional event that involved the reactivation of pre-existing thrust structures, deformation of the Folded Zone and eastern margins of the Nebo Synclinorium and Mimosa Syncline, and the rapid preferential uplift of the central Bowen Basin region.
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Christodoulou, C. "Petrology of the plutonic rocks of the Macquarie Island Complex /". Title page, contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phc556.pdf.

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Wong, Lai-man Kennis. "Geochemistry of mafic dykes from the Discovery Bay granitic pluton, Hong Kong". Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B42577688.

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Sigler, Joshua T. "The metamorphic and structural evolution of the Davis Peak area, northern Park Range, Colorado". Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1798480831&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Lassen, Birgitte. "Petrogenesis of the late Archean Quetico alkaline suite intrusions, Western Superior Province, Canada". Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/10684.

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A suite of 13 late Archean subalkaline to alkaline intrusions were studied by major and trace element geochemistry and neodymium, hafnium and lead isotopic methods. The intrusions (2683 - 2678 Ma) are located in the Quetico metasedimentary belt, western Superior Province, and include pyroxene hornblendite, diorite, monzonite, syenite and carbonatite. The samples display arc-like trace element patterns with high Cs, Ba, Sr and light rare earth element abundances and low Zr, Hf, Nb, Ta and Ti. Neodymium and hafnium isotope data reflect derivation from a depleted mantle source with minor contribution from an enriched source. Lead isotope ratios from K-feldspar separates are dominated by a slab fluid or crustal component. Quantitative modeling of trace element and isotope ratios illustrates that a metasomatic event shortly before melting produced the main geochemical signatures, but a contribution from an older crustal source is also required to explain the range in data. Melting models based on rare earth element variations suggest that melting occurred over a range of pressures or took place in the garnet spinel transition zone. The intrusive complexes can be subdivided into two groups on the basis of high field strength element distribution, which appears to reflect mantle heterogeneities resulting from differences in metasomatic processes. The most abundant group exhibits super-chondritic Nb/Ta and excess Nb relative to magmas produced by melting of a fluid metasomatized mantle. These characteristics are in accord with metasomatism by silicic melts that have left rutile in the residue and the metasomatic agent is thought to be a mixture of slab-derived fluids and melts. The trace element chemistry of the remaining intrusions reflects a source affected by fluid metasomatism. Carbonatite constitutes a minor part of the Beaverhouse Lake intrusion. Qualitative major and trace element modeling suggests that the carbonatite formed by carbonate-silicate liquid immiscibility. The carbonatite is characterized by highly depleted hafnium isotopic signatures, which are interpreted to result from a previous episode of carbonate metasomatism. Modeling of Lu-Hf partitioning during silicate-carbonate liquid immiscibility suggests that anomalously high hafnium isotopic ratios should develop with time in the carbonate phase, which has potentially important implications for carbonate metasomatism.
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Książki na temat "Intrusions (Geology)"

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1906-, Hunt Charles Butler, red. Geology of the Henry Mountains, Utah, as recorded in the notebooks of G.K. Gilbert, 1875-76. Boulder, Colo: Geological Society of America, 1988.

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Grant, Cawthorn R., red. Layered intrusions. Amsterdam: Elsevier, 1996.

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Knipping, Bernhard. Basalt intrusions in evaporites. Berlin: Springer-Verlag, 1989.

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Eales, Hugh V. The Bushveld Complex: An introduction to the geology and setting of the Bushveld Complex. Pretoria: Council for Geoscience, 2014.

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Alekseev, A. A. Different︠s︡irovannye intruzii zapadnogo sklona Urala. Ufa: Gilem, 2003.

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Dabovski, Khristo. Puknatinni intruzii v Srednogorieto: Strukturen analiz, matematichni i laboratorni modeli. Sofii͡a︡: Izd-vo na Bŭlgarskata akademii͡a︡ na naukite, 1988.

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Zolotukhin, V. V. Osobennosti different͡s︡irovannogo intruziva Tulaĭ-Kiri͡a︡ka na Taĭmyre: K probleme platformennykh granitov. Novosibirsk: "Nauka," Sibirskoe otd-nie, 1990.

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Geological Survey (U.S.), red. Descriptions of plutons in the western part of the Juneau and parts of the adjacent Skagway 1:250,000 quadrangles, southeastern Alaska. [Denver, Colo.?]: U.S. Dept. of the Interior, Geological Survey, 1986.

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N, Bri͡u︡khanov V., red. Kolʹt͡s︡evye struktury kontinentov Zemli. Moskva: "Nedra", 1987.

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1953-, Shimizu Masaaki, i Gastil R. Gordon, red. Recent advances in concepts concerning zoned plutons in Japan and southern and Baja California. Tokyo: University Museum, University of Tokyo, 1990.

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Części książek na temat "Intrusions (Geology)"

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Scoates, James S., i Corey J. Wall. "Geochronology of Layered Intrusions". W Springer Geology, 3–74. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9652-1_1.

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Veksler, Ilya V., i Bernard Charlier. "Silicate Liquid Immiscibility in Layered Intrusions". W Springer Geology, 229–58. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9652-1_5.

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Park, R. G. "Emplacement of igneous intrusions". W Foundations of Structural Geology, 94–99. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-011-6576-1_11.

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Latypov, Rais. "Basal Reversals in Mafic Sills and Layered Intrusions". W Springer Geology, 259–93. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9652-1_6.

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Higgins, Michael D. "Quantitative Textural Analysis of Rocks in Layered Mafic Intrusions". W Springer Geology, 153–81. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9652-1_3.

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O’Driscoll, Brian, Brian O’Driscoll, Eric C. Ferré, Carl T. E. Stevenson i Craig Magee. "The Significance of Magnetic Fabric in Layered Mafic-Ultramafic Intrusions". W Springer Geology, 295–329. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9652-1_7.

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Su, Ben-Xun. "Regional Geology". W Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication, 13–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_2.

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Petrov, Oleg, Edward Prasolov, Sergey Sergeev i Yury Pushkarev. "Isotope Correlations in Rocks and Ores of Major Intrusions in the Norilsk District". W Springer Geology, 207–13. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05216-4_7.

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Svensen, Henrik H., Stéphane Polteau, Grant Cawthorn i Sverre Planke. "Sub-volcanic Intrusions in the , South Africa". W Physical Geology of Shallow Magmatic Systems, 349–62. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-14084-1_7.

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Svensen, Henrik H., Stéphane Polteau, Grant Cawthorn i Sverre Planke. "Sub-volcanic Intrusions in the , South Africa". W Physical Geology of Shallow Magmatic Systems, 349–62. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/11157_2014_7.

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Streszczenia konferencji na temat "Intrusions (Geology)"

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Bulegenov, Kanat, Sayat Rais i Daulet Muratkhanov. "GEOLOGY OF PERMIAN GRANITES OF THE KARATAU-NARYN ZONE AND THEIR PROSPECTIVE FOR RARE METALS (SOUTH KAZAKHSTAN)". W 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/1.1/s01.07.

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The studied intrusive massif is an ellipse elongated in the sublatitudinal direction. Only the eastern part, 2.2x4 km in size, is exposed on the earth surface. Under the sediments, the intrusion was traced by boreholes and aeromagnetic survey. The intrusion is a sheetlike body of a fractured nature, inclined to the southwest. A zone of marmorized limestones, as well as tremolite and wolastonite hornfelses, formed at the contact with the intrusion. Among the intrusive rocks that make up the massif, three successive igneous phases are distinguished. The first phase is represented by pyroxenites, biotite pyroxenites, alaskites, hornblendites, pyroxene-hornblende shonkinites and pseudoleucite facies, in which mesocratic and melanocratic syenites are distinguished. The rocks of the second phase are pyroxene-biotite and hornblend-biotite-pyroxene shonkinites, monzonites, syenites, which have gradual transitions. The rocks of the third intrusive phase are represented by biotite-pyroxene-hornblend syenites. A characteristic feature of syenites is the abundance of xenoliths of rocks of the first and second phases and marbles. The main rock-forming minerals of these rocks are orthoclase, hornblend, diopside-augite, minor ones: biotite, acidic or intermediate plagioclase, nepheline. The rocks of the intrusion are enriched in zinc, yttrium, copper, tin, molybdenum, vanadium, and lead. In addition, they contain increased amounts of cobalt and silver. Intrusions have been studied and their prospects for rare metals and rare earth elements have been evaluated.
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Karmalkar, N. R., R. A. Duraiswami, M. K. Jonnalagadda, W. L. Griffin, Michel Gregoire, Mathieu Benoit i Guillaume Delpech. "Magma Types and Source Characterization of the Early Deccan Magmatism, Kutch Region, NW India:Insights from Geochemistry of Igneous Intrusions". W Recent Studies on the Geology of Kachchh. Geological Society of India, 2016. http://dx.doi.org/10.17491/cgsi/2016/105421.

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Sen, Gautam, Willis E. Hames, Dalim K. Paul, Sanjib K. Biswas, Arijit Ray i Indra S. Sen. "Pre-Deccan and Deccan Magmatism in Kutch, India: Implications of New 40Ar/39Ar Ages of Intrusions". W Recent Studies on the Geology of Kachchh. Geological Society of India, 2016. http://dx.doi.org/10.17491/cgsi/2016/105422.

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V., Järvinen, i Heinonen J. S. "Geology of the Precambrian mafic-ultramafic Näränkävaara intrusion – Review of recent results". W Project KO5125 ARLIN Arctic Layered Intrusions as a Source of Critical Metals for Green Economy European Neighbourhood Instrument Cross-Border Cooperation Programme Kolarctic 2014-2020. GI KSC RAS, 2021. http://dx.doi.org/10.31241/arlin.2021.017.

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Joonnekindt, Jean Pierre, Francisco Diaz, Russell Davies, Paul Hultzsch, Sri Mulyani, Rindu Intani, Fanji Putra i in. "Innovative Technical Strategies in Natural Fracture Characterization for Well Placement: Case Study from Darajat Field, Indonesia". W International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22373-ms.

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Abstract The Darajat geothermal field, located in West Java, Indonesia and operated by Star Energy Geothermal, has a long history of production with about 30 wells in which image log data are available. The subsurface geometry of the field was characterized initially from remote sensing methods and surface geology to locate the intrusions, faults and rock units comprising the reservoir, and later validated by well data. Reducing the uncertainty in future well locations depends on models of natural fractures applied and used successfully in oil and gas reservoirs, and associated permeability sweet spot maps. The modeling of natural fractures is determined by results from "drivers" calibrated to fractures interpreted in borehole image logs. These drivers most typically include distance-to-fault as in a damage zone, but also geomechanical methods that model fractures in the perturbed stress field around mapped faults. We modified the drivers to include the effects of the pressurized volcanic intrusions and their cooling for this geothermal field. These drivers were applied in sequential steps and fractures generated from the driver-specific constraints were compared against those observed in the well log images to define an intensity. In this paper we describe novel methods to characterize fractures to generate sweet spot maps for drilling locations in the Darajat geothermal field.
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McLemore, Virginia T. "Geology and geochemistry of the mid-Tertiary alkaline to calc-alkaline intrusions in the northern Hueco Mountains and adjacent areas, McGregor Range, southern Otero County, New Mexico". W 53rd Annual Fall Field Conference. New Mexico Geological Society, 2002. http://dx.doi.org/10.56577/ffc-53.129.

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Nutt, Constance J., i J. Michael O'Neill. "Geologic framework of Tertiary intrusions of the Cornudas Mountains, southern New Mexico". W 49th Annual Fall Field Conference. New Mexico Geological Society, 1998. http://dx.doi.org/10.56577/ffc-49.129.

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Connell, Katherine, M. Catherine Wilsbacher, Barbara P. Nash i David B. Hacker. "GEOLOGY OF A PALEOGENE ALMANDINE GARNET-BEARING RHYOLITE INTRUSION, NORTHERN BLACK HILLS IGNEOUS PROVINCE, SOUTH DAKOTA". W GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-341102.

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Wilsbacher, M. Catherine, Katherine Connell, Barbara P. Nash i David B. Hacker. "GEOLOGY OF THE CUSTER PEAK ALMANDINE GARNET-BEARING RHYOLITE INTRUSION, NORTHERN BLACK HILLS IGNEOUS PROVINCE, SOUTH DAKOTA". W GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-341080.

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Ohta, T., i T. Saito. "Intrusion behaviour of tree roots to rock mass caused by geologic structure". W THE 3RD INTERNATIONAL CONFERENCE ON CIVIL, MATERIALS, AND ENVIRONMENTAL ENGINEERING (ICCME 2021) (INTERNATIONAL WEBINAR) 4TH-5TH APRIL 2021. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0072621.

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Raporty organizacyjne na temat "Intrusions (Geology)"

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McLemore, Virginia T., Nels Iverson, Snir Woodard, Haley Dietz, Evan Owen, Ethan B. Haft, Tristan Childress, Amy Trivitt i Richard Kelley. Geology and Mineral Deposits of the Cornudas Mountains, Otero County, New Mexico. New Mexico Bureau of Geology and Mineral Resources, 2022. http://dx.doi.org/10.58799/ofr-619.

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Re-examination of the rare earth elements (REE) deposits in the Cornudas Mountains is warranted in light of today's economic importance of critical minerals, including REE that are essential in most of our electronic devices. New mapping, petrography, 40Ar/39Ar geochronology, and geochemical analyses have provided a better understanding of the emplacement of these intrusions and associated mineral deposits. The Cornudas Mountains form the northern Trans-Pecos alkaline magmatic province in the southern part of the North American Cordilleran alkaline-igneous belt. The igneous rocks in the Cornudas Mountains were emplaced in two pulses at 37.14-34.5 and 32.48-26.95 Ma, just prior to or during the early phases of Rio Grande rift extension, and consist of 1) larger nepheline syenite-syenite laccoliths and plugs, 2) phonolite plugs, sills, and dikes, 3) smaller syenite plugs and dikes that intrude Permian and Cretaceous sedimentary rocks, and 4) volcanic breccia dikes. New USGS geophysical data indicate that some of these intrusions extend deep into the subsurface, with additional buried intrusions potentially at depth. The focus of REE exploration is along the lower unit (PEnsp2) of the Wind Mountain nepheline syenite laccolith, as well as within syenite-phonolite and volcanic breccia dikes, plugs and skarns and carbonate-replacement deposits in Chess Draw. Some samples contain as much as 3110 ppm total REE. REE could be leached from a mineral concentrate of the REE-bearing minerals (eudialyte, zircon, monazite, bastnasite, calcio-catapleiite, vitusite, roumaite, xenotime). We incorporate whole rock and clinopyroxene chemistry of each intrusion into the clinopyroxene-liquid geothermobarometer (Masotta, 2013) to determine the temperatures and pressures of emplacement. This thermometer provides higher crystallization temperature estimates for the syenite intrusions (857-1027 deg. C) than the phonolite sills (760-869 deg. C). We then use the barometric estimates (0.3-3.3 kbar) to calculate emplacement depths (1.2-12.3 km). Pairing these depths with the new geochronology, minimum exhumation rates for intrusions in the Cornudas Mountains are estimated that range from 0.04-0.34 mm/yr crystallization temperatures and exhumation rates provide additional information to aid in developing a model for the formation of REE deposits.
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Currie, K. L. Geology of Fogo Island, Newfoundland - a study of the form and emplacement of igneous intrusions. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/208656.

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Paktunc, D. Geology of the Stephen Intrusion. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/130643.

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Paktunc, D., J. Ketchum i D. Watanabe. Geology of the mechanic intrusion. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/130644.

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Paktunc, D. Geology of the Portage Brook Intrusion, New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/130797.

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Rowins, S. M., A. E. Lalonde i E. M. Cameron. Geology of the Archean Murdoch Creek Intrusion, Kirkland Lake, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/126876.

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Hulbert, L. Geology of the Muskox Intrusion and associated Ni+Cu occurrences. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2005. http://dx.doi.org/10.4095/220361.

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Manor, M. J., C. J. Wall, G. T. Nixon, J. S. Scoates, R H Pinsent i D. E. Ames. Preliminary geology and geochemistry of the Giant Mascot ultramafic-mafic intrusion, Hope, southwestern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293429.

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Duke, J. M. Petrology and economic geology of the Dumont Sill: an archean intrusion of komatiitic affinity in northwestern Quebec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120607.

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Hakonson, T. E. Evaluation of geologic materials to limit biological intrusion into low-level radioactive waste disposal sites. Office of Scientific and Technical Information (OSTI), luty 1986. http://dx.doi.org/10.2172/6201692.

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