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Academic literature on the topic 'Lamprophyre dikes'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Lamprophyre dikes"

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Štemprok, Miroslav, and Thomas Seifert. "An overview of the association between lamprophyric intrusions and rare-metal mineralization." Mineralogia 42, no. 2-3 (January 1, 2011): 121–62. http://dx.doi.org/10.2478/v10002-011-0011-x.

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An overview of the association between lamprophyric intrusions and rare-metal mineralizationGranite-related rare metal districts in orogenic settings are occasionally associated with lamprophyre dikes. We recorded 63 occurrences of lamprophyres in bimodal dike suites of about 200 granite bodies related to rare metal deposits. Most lamprophyres occur in Paleozoic and Mesozoic metallogenic provinces in the northern hemisphere. Lamprophyres which are associated with rare metal deposits are calc-alkaline (kersantites, minettes, spessartites) or more rarely alkaline lamprophyres (camptonites, monchiquites) which occur in the roof zone of complex granitic bodies as pre-granitic, intra-granitic, intra-ore or post-ore dikes. Most lamprophyres are spatially associated with dominant felsic dikes and/or with mafic dikes represented by diorites or diabases. Diorites and lamprophyres occasionally exhibit transitional compositions from one to another. Lamprophyres share common geochemical characteristics of highly evolved granitoids such as enrichment in K and F, increased abundances of Li, Rb, and Cs and enrichment in some HFSE (e.g. Zr, U, Th, Mo, Sn, W). Lamprophyres in rare metal districts testify to accessibility of the upper crust to mantle products at the time of rare metal mineralization and possible influence of mantle melts or mantle-derived fluids in the differentiation of granitic melts in the lower crust.
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Vasyukova, Elena A., and Alexander S. Borisenko. "Petrological implications of the Early Mesozoic lamprophyre dikes and related Tarkhata syenites (SE Altai and NW Mongolia)." Mineralogia 44, no. 1-2 (June 1, 2013): 13–30. http://dx.doi.org/10.2478/mipo-2013-0002.

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AbstractThis paper presents new data derived from field sampling and from a thorough description of lamprophyres located in southeastern Altai and northwestern Mongolia in terms of their mineralogy, textures, and chemical composition. The swarms of alkaline mafic dikes in the area coexist with granosyenite-monzodiorite and gabbro-dolerite intrusions and spatially coincide with an ore district of Sb-Hg, Ag-Sb, Ni-Co-As, Cu-Mo-W, and CaF2 hydrothermal mineralization. All lamprophyres belong to the Early Mesozoic Chuya complex formed in an intracontinental enviroment. Their distribution and orientation is controlled by two large fault zones. The Chuya dikes were investigated at two localities, namely, Yustyd and South-Chuya. The Yustyd lamprophyres intrude Middle-Upper Devonian black shale of the Yustyd depression. At South Chuya, lamprophyres, together with the Tarkhata granosyenite-monzodiorite complex, are hosted by Cambrian and Ordovician metamorphic rocks of the South-Chuya Range. Ar-Ar (phlogopite) and U-Pb (SHRIMP, zircon) ages of the lamprophyre dikes indicate long and continuous period of the formation of the Chuya complex (250-235 Ma). Major- and trace-element compositions of the lamprophyres from both localities and of the syenite indicate their origin from the same magma source. The textures and structures of the lamprophyre and plutonic rocks, their mineral assemblages and the chemistry of the rock-forming minerals provide clues to the evolution of the parental alkaline mafic magma and fluid regime.
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Kamvisis, Ioannis-Nektarios G. "Lamprophyric rock locations in Greece." Mineralogia 50, no. 1-4 (December 1, 2019): 13–33. http://dx.doi.org/10.2478/mipo-2019-0002.

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AbstractTwenty-four areas with lamprophyric formations have been located through a bibliographic search in Macedonia, Thrace, the islands and Attica. Most lamprophyre types have been identified including rare “alkali minette”. In most localities the dikes/sills appear to be late mantle products associated with deep faulting following extensional activity in granitoids.
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Thủy, Nguyễn Thị, Nguyễn Thị Lệ Huyền, Nguyễn Thị Ngọc Trâm, and Lê Hải Nghĩa. "Mineral compositions of magmatic dikes cutting across the Khe Phen granites (Huong Tra, Thua Thien Hue, Central Vietnam)." Hue University Journal of Science: Natural Science 128, no. 1B (June 7, 2019): 21. http://dx.doi.org/10.26459/hueuni-jns.v128i1b.5280.

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The Khe Phen granite quarry located in Huong Tra district (Thua Thien Hue province) has been confirmed as a part of the Ba Na granitoid complex (G/K<sub>2</sub><em>bn</em>), mostly composed of two-mica granite and porphyritic granite. Field survey data show that the granites here are cut across by five distinct narrow dikes (about 50-70 cm wide) including granite pegmatite, granite aplite, aplite, granodiorite and lamprophyre diorite. Mineral compositions of the granite pegmatite and aplite dikes are similar with those of the host granite, which are mainly comprised of quartz (27-35 %), orthoclase (45-58 %), plagioclase (4-15 %), biotite (1-3 %) and a few opaque minerals. Meanwhile, the granodiorite and lamprophyre diorite dikes are melanocratic and compositionally much more mafic, particularly lamprophyre diorite, evidenced by a presence of hornblende (50-55 %), plagioclase (33-40 %), quartz (3-15 %), calcite (5-17 %)... Origin and emplacement age of the latter dikes have not been reported so far, and thus are needed for further studies based on geochemical and isotopic data.
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Sun, Yi-Zhan, Kun-Feng Qiu, Mao-Guo An, Shan-Shan Li, Zhen Shang, and Yu Wang. "Geochronological and Geochemical Constraints on the Petrogenesis of Lamprophyre from the Giant Weishan REE Deposit in China." Minerals 12, no. 6 (May 31, 2022): 706. http://dx.doi.org/10.3390/min12060706.

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The Weishan REE deposit is located in the southwest of the Luxi Terrane of the North China Craton (NCC), where a large number of lamprophyre dikes are spatially exposed with the deposit. Here, we report petrology, geochemistry and zircon U-Pb geochronology data for the lamprophyre of the Weishan REE deposit in order to develop constraints for the determination of the petrogenesis, magma source and evolution of the lamprophyre and the tectonic environment. LA-LCP-MS zircon U-Pb dating shows that the crystallization age of the lamprophyre is 125 ± 0.86 Ma. The geochemical data suggest that these lamprophyres have high levels of Al2O3, K2O, MgO and alkalis, moderate level of Na2O and low levels of SiO2, Fe2O3 and TiO2, and that they are enriched with LREEs (La, Ce) and LILEs (Rb, Ba) and depleted with regard to HREEs and HFSEs (Nb, Ta, Ti). They displayed negative εHf(t) values of −14.98 to −9.03, TDM1 ages of 1.1–1.4 Ga and TDM2 ages of 1.7–2.1 Ga, which suggest that the magma source originates from an enriched mantle. Low Rb/Sr and high Dy/Yb ratios suggest that the enriched mantle source was partially melted at the amphibole-bearing lherzolite garnet-facies. The high Ba/Th and Sr/Th ratios indicate that the enriched source was derived from subduction dehydration fluids of the oceanic crust. We propose that the mafic dike intrusions are consistent with an Early Cretaceous alkaline magma emplacement in an extensional setting, in which the magma was not contaminated by crustal material during its emplacement.
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Owens, Brent E., and Paul B. Tomascak. "Mesoproterozoic lamprophyres in the Labrieville Massif, Quebec: clues to the origin of alkalic anorthosites?" Canadian Journal of Earth Sciences 39, no. 6 (June 1, 2002): 983–97. http://dx.doi.org/10.1139/e02-010.

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Mesoproterozoic lamprophyre dikes occur at four localities within the ~1010 Ma Labrieville anorthosite in the Grenville Province of southern Quebec. All dikes are thin (<20 cm wide), oriented ~N57W, and steeply dipping. Three are biotite lamprophyres, but the fourth is dominated by amphibole. Laser total-fusion 40Ar/39Ar analyses on amphibole or biotite yield minimum ages for the dikes of 945.5 ± 8 Ma, 907.0 ± 5.9 Ma, 892.0 ± 6.2 Ma, and 889.2 ± 9.8 Ma. A crystallization age of ~1 Ga for all dikes is consistent with these data and Rb–Sr isotopic systematics. All lamprophyres contain high levels of Cr (284–393 ppm), Ni (101–180 ppm), Ba (1380–5580 ppm), Sr (2359–3109 ppm), and rare-earth elements (REE; LaN = 191–288), with average LaN/LuN = 26 and no Eu-anomalies. At 1 Ga, all lamprophyres have a similar initial Sr isotopic ratio of ~0.7034, similar to Bulk Earth. In contrast, εNd values vary considerably from –4 to –10.2, indicating sources with variable long-term light-REE enrichment. Negative correlations between 143Nd/144Nd and La/Nb and K suggest involvement of at least two source components, probably asthenosphere and metasomatized subcontinental lithosphere. The lamprophyres are only slightly younger than ~1010 Ma Labrieville massif, which is also alkalic and enriched in Sr and Ba relative to most other anorthosites. The lamprophyres provide unequivocal evidence for a Sr- and Ba-rich component in the lithospheric mantle that may have contributed to the parental magmas of Labrieville and other andesine anorthosites in this part of Quebec.
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Borradaile, G. J., M. M. Kehlenbeck, and T. W. Werner. "A magnetotectonic study correlating late Archean deformation in northwestern Ontario." Canadian Journal of Earth Sciences 31, no. 9 (September 1, 1994): 1449–60. http://dx.doi.org/10.1139/e94-128.

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Late Archean lamprophyre dikes crop out on both sides of the Quetico–Shebandowan subprovince boundary. They post date F1 folds in late Archean rocks (2690 Ma) but their intrusion overlapped with the waning phase of S1 development. S1 developed to varying degrees or is absent in some dikes. Nevertheless, the dikes show a cryptic tectonic fabric in the ferromagnetic minerals revealed by anisotropy of magnetic susceptibility (AMS). This is parallel to S1 in the host metamorphic rocks. Thus, the S1 fabric-forming episode may be correlated from one subprovince to the other using the dike swarm as a chronological marker.
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Ishbaev, Kh D., A. Kh Shukurov, and K. M. Kosbergenov. "Lamprophyres and mineralization of the Koytash ore field (Southern Tien Shan)." LITHOSPHERE (Russia) 20, no. 2 (April 25, 2020): 231–53. http://dx.doi.org/10.24930/1681-9004-2020-20-2-231-253.

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Research subject. The Koytash ore field is located in the potentially productive Au, Ag, W, Mo, Ti, Fe, Cu, Pb, Zn and REE North Nuratau mineralisation zone of Tien Shan. The authors undertook a study of the composition of dikes breaking through the Paleozoic ore-bearing formations, as well as their petro- and ore-generating role in the formation of the Koytash-Ugat sulphide-rare-metal (W, Mo, Fe) specialised mineralisation. Materials and methods. A study of rock and mineral composition was performed at the Institute of Geology and Geophysics named after Kh.M. Abdullaev. The content of petrogenic and rare elements in rocks and sulphides was determined by ICP-MS using an ICPE-9000 mass-spec trometer in the Central Laboratory of the State Committee for Geology of the Republic of Uzbekistan. The chemical analysis of minerals was performed using a Jeol-8800Rh electronic microanalyser at the Institute of Geology and Geophysics named after Kh.M. Abdullaev. The micrographs of transparent sections were obtained using Nikon Optiphot 2 Pol and Polam R-311 microscopes. Results and conclusions. The conducted study showed that, in terms of their structure, the Koytash ore field dike formations can be regarded as lamprophyres. In terms of their chemical composition, these formations are mafic and intermediate rocks of the subalkaline series. It was found that the composition of lamprophyre dikes correlates with the size of the erosion section. Their melanocratic varieties are confined to the southern part of the intrusion (absolute elevations are 1000–1200 m), and leucocratic – to the northern (about 1900 m). This is assumed to be the result of crystallization differentiation of a single initial melt. The dikes of the Koytash ore field lamprophyres break through not only sulphide-rare-metal bodies of the Koytash-Ugat strip, but also skarn and carbonate rocks and, in turn, are broken through by quartz-polymetallic ore-bearing veins, which testifies to their inter-ore character.
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Mitchell, Roger H., R. Garth Platt, Maureen Downey, and David G. Laderoute. "Petrology of alkaline lamprophyres from the Coldwell alkaline complex, northwestern Ontario." Canadian Journal of Earth Sciences 28, no. 10 (October 1, 1991): 1653–63. http://dx.doi.org/10.1139/e91-147.

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A suite of alkaline lamprophyre dikes emplaced in centers I and II rocks of the Coldwell alkaline complex is composed of camptonites with calcite ocelli, camptonites with quartz macrocrysts, amphibole camptonites, monchiquites, and sannaites. The camptonites are characterized by phenocrysts of olivine, aluminian pyroxene, kaersutite, and titanian ferropargasite set in a matrix of magnesian hastingsite, augite, plagioclase, biotite, magnetite, sphene, and minor nepheline. Quartz macrocrysts occur as corroded euhedral single crystals. Monchiquites are petrographically similar to the camptonites but are characterized by the presence of an isotropic groundmass. Sannaites contain aluminian and chromian diopside phenocrysts set in a matrix of ferroan pargasite, aluminian diopside, biotite, albitized plagioclase, and epidotized alkali feldspar.Major-element compositions indicate the ocellar camptonites, amphibole camptonites, and monchiquites have affinities with alkali olivine basalt and that monchiquites and camptonites are heteromorphs. None of the dikes represent primitive liquids. Poor correlations between incompatible trace elements (Sr, Ba, Nb, Zr, rare earths), together with the presence of reversely zoned and corroded phenocrysts, suggest that none of the lamprophyres represent single batches of magma. The lamprophyres are considered to be hybrid magmas, formed by the mixing of fragmented cumulates, several generations of phenocrysts, and batches of magma extracted from a continuously replenished evolving magma chamber located within the infrastructure of the complex. Quartz-bearing camptonites are considered to form by contamination of camptonites, although the source of the quartz cannot be determined.
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Edgar, A. D., L. A. Pizzolato, and G. M. Butler. "Petrology of the ultramafic lamprophyre and associated rocks at Coral Rapids, Abitibi River, Ontario." Canadian Journal of Earth Sciences 31, no. 8 (August 1, 1994): 1325–34. http://dx.doi.org/10.1139/e94-115.

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An ultramafic lamprophyre sill and dikes, and an olivine–melilite-rich dike rock intrude Lower to Middle Devonian sediments and low- to high-grade Archean metamorphic rocks on the west bank of the Abitibi River, Coral Rapids, Ontario. Although previously considered to be kimberlitic, all these rocks contain olivine + clinopyroxene + phlogopite ± melilite, and hence are ultramafic alkaline rocks. The ultramafic lamprophyre can be distinguished from the dike by its lower SiO2, Na2O, Al2O3, and higher MgO and FeO. In contrast the olivine–melilite dike rock has a more uniform composition, characteristically contains melilite, and has higher Cr and Ni contents. Enriched light rare earth element (LREE) chondrite-normalized patterns are similar for all rocks.Olivine, clinopyroxene, and phlogopite have Mg# (Mg# = 100 Mg/(Mg + Fe) mol) typical of minerals in primitive alkaline rocks. Melilite composition is similar to that of igneous melilites. Phlogopites in all rock types are enriched in Ba and F and the degree of enrichment is distinct for each rock type. Accessory minerals include apatite, carbonates, chlorite, sericite, and sodalite (only in the olivine–melilite-bearing rock).The mineralogy and chemistry of the Coral Rapids rocks suggest that they are derived from a primitive olivine melilitite magma that may have evolved by fractionation of small amounts of olivine and clinopyroxene to form these alkaline ultramafic magmas.Xenoliths in the ultramafic lamprophyre sill and in lesser abundance in the olivine–melilite dike rock include olivine, phlogopite, and clinopyroxene-rich mantle-derived assemblages. The similarity between these xenoliths and their host rocks at Coral Rapids and those from southwest Uganda and West Eifel, Germany, suggests that the Coral Rapids rocks may be derived from magmas that originated from metasomatized mantle sources.
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Dissertations / Theses on the topic "Lamprophyre dikes"

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Habib, Shanif Sadrydin. "The petrology and geochemistry of Proterozoic ultrapotassic, diamond-bearing lamprophyre dikes of the Gibson-MacQuoid Lake Belt, District of Keewatin, Northwest Territories." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0030/MQ30724.pdf.

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Costello, Lacey. "ALTERATION AND OXIDATION ALONG AN OLIVINE LAMPROPHYRE DIKE FROM SOUTHERN UTAH, USA: AN ANALOG FOR MARS." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2383.

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The physical and chemical weathering of iron and magnesium silicates can provide important insights into the environment to which the rock was exposed. The process of iron alteration and oxidation may be particularly prevalent on Mars because Martian basalts usually contain more iron than terrestrial basalts. Specifically, weathering and oxidation may have been prominent during the Noachian, when the atmosphere was likely warmer and wetter and where liquid water could exist to drive alteration and redox reactions. I have investigated a terrestrial analog on the Colorado Plateau for such a process of alteration oxidation of a mafic dike. This work investigates the change from a relatively fresh to an altered mafic intrusion to constrain the effect of alteration on chemistry and mineralogy. There are four main zones of oxidation along the intrusion that can be generally characterized by the difference in color in the field and in hand sample. Calcite, hematite, and kaolinite are the dominant alteration minerals present throughout the intrusion and occur in greater concentration in the more altered samples. These same alteration minerals are also found at Gusev Crater, Mars. This terrestrial analog and thermochemical models show evidence for hot, neutral fluids at intermediate water/rock ratios during the formation of alteration minerals in the terrestrial analog dike and at Gusev Crater.
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Kaiser, Claudia. "Multi-component evolution, age and plate tectonic setting of high MG lamprophyric dikes and small gabbroic intrusions on Isla Margarita (Venezuela)." [S.l. : s.n.], 1997. http://deposit.ddb.de/cgi-bin/dokserv?idn=967704618.

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Lee, Paula M. "Spatial, temporal, and petrogenetic relationship of basaltic and lamprophyric dikes and sills of the Raton Basin, southern Colorado and northern New Mexico." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/5848.

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Thesis (M.S.)--University of Missouri-Columbia, 2005.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 11, 2006) Includes bibliographical references.
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Moulahoum, Omar. "Dualité du magmatisme d'âge pan-africain : Aspects structuraux et pétrologiques des granites subalcalins et alumineux de la région de Tamanrasset (Hoggar central, Algérie." Nancy 1, 1988. http://www.theses.fr/1988NAN10049.

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Durant l'orogène du "Pan-Africain" (~ 600 Ma), la région du Hoggar central, à l'instar de l'ensemble du Bouclier Touareg, a été intensément affectée. Cet évènement est accompagné de la mise en place d'ensembles magmatiques variés. Dans la région de Tamanrasset, deux magmatismes de nature différente sont mis en évidence : magmatisme subalcalin et magmatisme alumineux. Le premier est représenté par les massifs syn à tardi-orogéniques (Anfeg - Tifferkit), voire post-orogénique (Aheleheg') tandis que le second est exclusivement constitué par les plutons post-orogéniques (In-Tounine et intrusions granitiques à albite-topaze). Compte tenu des critères de terrain, pétrographiques, géochimiques et parfois isotopiques, trois groupes magmatiques peuvent être distingués.
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You, Cian-siang, and 尤芊翔. "Structural evolution study of lamprophyric dikes and country rocks in Lailai, northeastern coast of Taiwan." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/31951765243302759352.

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碩士
國立中央大學
應用地質研究所
103
Lai-Lai wave-cut platform is the geological continuation of Hsuehshan mountain range in the northeastern coast of Taiwan. The Lamprophyric dikes stand in right-stepping en-echelon form with faults, joints and folds in different scales on the platform. The dike formed in 9±1.1 Ma ago and the arrangement of the dikes records the stress state during volcanic activity in the late Miocene. Faults and fractures in the dikes and the country rocks show the strain state of Penglai orogeny since Pliocene, and also response the different deformation behavior caused by the difference of rock strength. In this study, I made detailed structural geologic maps in different scales (up to 1:20), and used unmanned aerial vehicle (UAV) to take orthophotography to display the detailed structural distribution. Electrical resistivity imaging (ERI) profile was performed to decipher the arrangement of the dikes underground and the characteristics of the faults. East-west trending dikes can reach 3 meters in maximum height and 190 meters in total length. 19 dike segments are exposed on the platform and range from 2 to 30 meters in length f. The strata of country rocks orientated north-south, dipping to west 10~20 degree are Oligocene Tatungshan formation composed mainly of argillite. My field observation reveals that N-S-trending right-lateral strike-slip faults which dislocated dikes less than 2 meters are the latest faulting event. After restoring the results from faulting, dikes remain right-stepping en-echelon arrangement in 3 segments at least. Based on field observation and stratigraphic analysis, I conclude that magma ascended along en-echelon joints and solidified into three dikes in ‘Tatungshan formation’ at depth of 2.6 kilometers. There are west dipping reverse faults and vertical right-lateral strike-slip faults in dikes. The strike-slip faults intersect with dikes in an acute angle, which makes the dikes appear as horizontal duplex structures. The structural evolution of dikes in Lailai platform are: ‘Tatungshan formation’ formed in passive continental shelf and en-echelon joints formed in late Oligocene; magma ascended along en-echelon joints and en-echelon dikes formed in late Miocene. After the Penglai orogeny took place in Pliocene, reverse faults and duplex structures took place in dikes. Then the N-S-trending right-lateral strike-slip faults cut the dikes and displaced them. At last, tectonic uplift and unroofing formed extension joints. Dikes are exposed in right-stepping en-echelon form in the platform now.
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Huang, Shu-Yuan, and 黃蜀圓. "Structure Geology Analysis of Lamprophyre Dike and Its Wall Rocks at Lailai Area, Northeastern Coast of Taiwan." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/aa2jxc.

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碩士
國立臺北科技大學
材料及資源工程系所
93
Taiwan is situated at the collision and orogenic belt of the Eurasian plate and the Philippine Sea plate. For this special tectonic framework, Many conspicuous orogenic structures and volcaniam features were widespread in the rocks and are recorded in the tertiary strata. There are many alkali basaltic dikes have been found in the Oligocene sedimentary strata exposed near Lailai, Shuangxi, Toucheng, Jinmianshan, and Suao of the northeastern coast of Taiwan. The purpose of this study is hoped to provide some methods to identify the development sequence of the structures on the dike, such as fault, joint, and shear fractures in the coast near Lailai area. It is also provided some information available to explain the intrusive mechanism of the Lailai dike.
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Kaiser, Claudia [Verfasser]. "Multi-component evolution, age and plate tectonic setting of high MG lamprophyric dikes and small gabbroic intrusions on Isla Margarita (Venezuela) / Claudia Kaiser." 1997. http://d-nb.info/967704618/34.

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Book chapters on the topic "Lamprophyre dikes"

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Dobak, Paul J., François Robert, Shaun L. L. Barker, Jeremy R. Vaughan, and Douglas Eck. "Chapter 15: Goldstrike Gold System, North Carlin Trend, Nevada, USA." In Geology of the World’s Major Gold Deposits and Provinces, 313–34. Society of Economic Geologists, 2020. http://dx.doi.org/10.5382/sp.23.15.

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Abstract The Eocene Goldstrike system on the Carlin Trend in Nevada is the largest known Carlin-type gold system, with an endowment of 58 million ounces (Moz) distributed among several coalesced deposits in a structural window of gently dipping carbonate rocks below the regional Roberts Mountains thrust. The 3.5- × 2.5-km Goldstrike system is bounded to the east by the Post normal fault system and to the south by the Jurassic Goldstrike diorite stock and is partly hosted in the favorable slope-facies apron of the Bootstrap reef margin that passes through the system. The carbonate and clastic sedimentary sequence is openly folded, cut by sets of reverse and normal faults, and intruded by the Jurassic Goldstrike stock and swarms of Jurassic and Eocene dikes, establishing the structural architecture that controlled fluid flow and distribution of Eocene mineralization. A proximal zone of permeability-enhancing decarbonatization with anomalous gold (&gt;0.1 ppm) extends a few hundreds of meters beyond the ore footprint and lies within a carbonate δ18O depletion anomaly extending ~1.4 km farther outboard. The full extent of the larger hydrothermal system hosting Goldstrike and adjacent deposits on the northern Carlin Trend is outlined by a 20- × 40-km thermal anomaly defined by apatite fission-track analyses. The bulk of the mineralization is hosted in decarbonatized sedimentary units with elevated iron contents and abundant diagenetic pyrite relative to background. Gold is associated with elevated concentrations of As, Tl, Hg, and Sb, and occurs in micron-sized arsenian pyrite grains or in arsenian pyrite overgrowths on older, principally diagenetic pyrite, with sulfidation of available iron as the main gold precipitation mechanism. The intersection of a swarm of Jurassic lamprophyre dikes with the edge of the limestone reef provided a favorable deeply penetrating structural conduit within which a Jurassic stock acted as a structural buttress, whereas the reef’s slope-facies apron of carbonate units, with high available iron content, provided a fertile setting for Carlin-type mineralization. The onset of Eocene extension coupled with a southwestward-sweeping Cenozoic magmatic front acted as the trigger for main-stage gold mineralization at 40 to 39 Ma. All these factors contributed to the exceptional size and grade of Goldstrike.
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Hermes, O. Don. "Geologic relationships of Permian Narragansett Pier and Westerly Granites and Jurassic lamprophyric dike rocks, Westerly, Rhode Island." In Centennial Field Guide Volume 5: Northeastern Section of the Geological Society of America, 181–86. Geological Society of America, 1987. http://dx.doi.org/10.1130/0-8137-5405-4.181.

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Marchev, Peter, Shoji Arai, and Orlando Vaselli. "Cumulate xenoliths in Oligocene alkaline basaltic and lamprophyric dikes from the eastern Rhodopes, Bulgaria: Evidence for the existence of layered plutons under the metamorphic core complexes." In Postcollisional Tectonics and Magmatism in the Mediterranean Region and Asia. Geological Society of America, 2006. http://dx.doi.org/10.1130/2006.2409(13).

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Conference papers on the topic "Lamprophyre dikes"

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Shamus, Tim, Matt Marguglio, and Matthew J. Severs. "ORIGIN OF NORTHERN NEW JERSEY LAMPROPHYRE DIKES IN RELATION WITH THE BEEMERVILLE COMPLEX." In 53rd Annual GSA Northeastern Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018ne-311338.

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Langschultz, James, Evan Castle, Elizabeth Appaluccio, Matthew J. Severs, and Susanne Moskalski. "INVESTIGATING THE ORIGIN OF LAMPROPHYRE DIKES IN THE BEEMERVILLE COMPLEX, SUSSEX COUNTY, NEW JERSEY." In 54th Annual GSA Northeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019ne-327633.

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Comuso, Christina, Donald Maute, Mike Mars, Bethany Williams, and Matthew J. Severs. "INSIGHTS INTO THE SUB-CONTINENTAL LITHOSPHERIC MANTLE FROM GEOCHEMICAL ANALYSIS OF LAMPROPHYRE DIKES AND ENTRAINED XENOLITHS FROM WESTERLY, RHODE ISLAND." In 51st Annual Northeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016ne-272454.

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Piispa, Elisa J., Aleksey V. Smirnov, Aleksey V. Smirnov, Lauri J. Pesonen, Lauri J. Pesonen, Roger Mitchell, and Roger Mitchell. "PALEOMAGNETISM AND GEOCHEMISTRY OF ~1144-MA LAMPROPHYRE DIKES, NORTHWESTERN ONTARIO: IMPLICATIONS FOR THE NORTH AMERICAN POLAR WANDER PATH AND PLATE VELOCITIES." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-317870.

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Buddington, A. M., Cody J. Steven, and Basil Tikoff. "EOCENE LAMPROPHYRIC DIKES FROM NORTHERN IDAHO AND NORTHEASTERN WASHINGTON." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-297936.

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You might also be interested in the extended bibliographies on the topic 'Lamprophyre dikes' for particular source types:
Journal articles
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