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Dissertations / Theses on the topic 'Geological age'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Mabidi, Tshifhiwa. "Quantifying spatial association between mineral deposits and geology across three African crustal segments of different age, with implication for secular change in mineralization during earth history." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/19028.

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Variations in enrichment of mineralization, expressed in ore deposits, in the continental crust may be one way to test for secular changes in crustal genesis. This study collates and analyses fundamental information about mineral deposits with which to 'fingerprint' the metal endowment of African crust of different age. Three areas of juvenile African crust (e.g. mantle derived over similar lengths of time of ~500 million years, and excluding recycled older crust) of different ages with similar geology are compared. The areas range in age from 0.5 to 3.0 Ga, [e.g. the Zimbabwe Craton (2.5-3.0

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2

Lea, James M. "Fluctuations of a Greenlandic tidewater glacier from the Little Ice Age to present : reconstruction and modelling of Kangiata Nunaata Sermia, SW Greenland." Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=211429.

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Significant uncertainty surrounds the influence of atmospheric and oceanic forcing on the fluctuations of tidewater glacier outlets of the Greenland ice sheet (GrIS), with the majority of studies focussing on dynamics over the last two decades. Although numerical model based projections exist anticipating the future dynamics of major GrIS outlets, these have been made using temporally limited model calibration periods (<5 years) compared to the centennial timescales that they seek to predict over. The ability of these numerical models to simulate the centennial timescale dynamics of GrIS tidew

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3

Luo, Yan. "U-Pb age and Hf isotopic study of detrital zircons from the Liaohe Group constraints on the evolution of the Jiao-Liao-Ji Belt, North China craton /." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36639242.

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4

Fadipe, Oluwaseun Adejuwon. "Facies, Depositional Environments and Reservoir Properties of the Albian Age Gas Bearing Sandstone of the Ibhubesi Oil Field, Orange Basin, South Africa." Thesis, University of the Western Cape, 2009. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3304_1285541101.

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<p>The Orange Basin was formed during the late Jurassic to early Cretaceous periods due to Gondwana breakup and rifting and later drifting apart of the African and South American plates. The basin consists of siliciclastic sandstone which took its sediment supply from river system with a rivalling delta to the north of the basin. Geological and petrophysical studies were carried out to evaluate the reservoir potential of the wells in the study area. This study considered five wells (A-G1, A-W1, A-K1, A-K2 and A-Y1) in the Orange Basin with attention to the Albian age sandstone. Only three of t

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5

Luo, Yan, and 羅彥. "U-Pb age and Hf isotopic study of detrital zircons from the Liaohe Group: constraints on the evolution of theJiao-Liao-Ji Belt, North China craton." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36639242.

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6

Harper, Charles L. "On the nature of time in cosmological perspective : a comparative study of the weak and strong interaction chronometries via an analysis of high resolution ⁸⁷Rb-β-̄⁸⁷Sr, ²³⁵/²³⁸U-α-²⁰⁷/⁷⁰⁶Pb and ¹⁴²Sm-α-¹⁴³Nd isotopic age determinations of meteoritic, lunar and geological samples". Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670359.

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7

Borges, Paulo Alexandre Vieira. "Pasture arthropod community in Azorean Islands of different geological ages." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285174.

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8

BARLOW, NADINE GAIL. "RELATIVE AGES AND THE GEOLOGIC EVOLUTION OF MARTIAN TERRAIN UNITS (MARS, CRATERS)." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184013.

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Existing martian relative age chronologies rely entirely or predominantly on Mariner 9 images, extrapolated numbers of craters, and craters 500(DEGREES)K) for the planet are consistent with the derived chronology.

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9

Baca, Kira J. "Environmental Impacts on the Development and Dune Activity of Oxbow Lake along the Southwest Coast of Lake Michigan at Saugatuck, Michigan USA." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1365161018.

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10

Hoopes, John C. "An Integrated Geophysical and Geologic Study of the Paleogene-Age Volcanic Body and Possible Landslide Deposit on the South Slope of the Traverse Mountains, Utah." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2866.

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Development of homes, roads, and commercial buildings in northern Utah has grown significantly during the last several decades. Construction has expanded from the valley floor to higher elevations of benches, foothills, and other elevated regions of the Wasatch Mountain Front. Construction in the higher elevation areas are a concern due to potential for landslides, both new and reactivated. Landslides have been identified in this region and are dated as Pleistocene to historical in age. A possible landslide of about 0.5 km2 on the south slope of Traverse Mountain has been mapped by the Utah Ge

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11

Meneguolo, Renata. "Stratigraphic and compositional study of mixed shallow-water carbonate-siliciclastic units of carnian age (late triassic) in Dolomites and Julian Alps (Italy)." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425574.

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The Julian to Tuvalian (Carnian, Late Triassic) units of the Dolomites and Julian Alps (Eastern Southern Alps, Northern Italy) have been studied under a sedimentological and petrographical point of view. This stratigraphic interval records an important turnover in the sedimentary system with at least two phases of coarse terrigenous input interfingered with carbonate deposits. This episode seems coeval with a wet climatic event named “Carnian Pluvial Event (CPE)”. The arenite petrography of the Carnian coarse siliciclastics has been studied in order to provide insights on the structure and cli

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12

Gärtner, Andreas. "Geologic evolution of the Adrar Souttouf Massif (Moroccan Sahara) and its significance for continental-scaled plate reconstructions since the Mid Neoproterozoic." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-234103.

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Located in the south of the Moroccan Sahara, the Adrar Souttouf Massif is the northern continuation of the Mauritanides at the western margin of the West African Craton. The massif itself exhibits a complex polyphase geologic history and contains four geologically different, SSW-NNE trending main units named from west to east: Oued Togba, Sebkha Gezmayet, Dayet Lawda, Sebkha Matallah. They are thrusted over each other in thin-skinned nappes with local windows of the discordantly overlain Archaean Reguibat basement. The eastern margin of the massif is bordered by the Tiris and Tasiast-Tijirit a

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13

Silva, Daniel Adelino da. "Geocronologia (40Ar/39Ar e U-Pb), petrografia e litogeoquímica da intrusão alcalina do Marapicu RJ." Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=9115.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>A intrusão alcalina do Marapicu é uma intrusão localizada no maciço Marapicu-Gericinó-Mendanha situado na região metropolitana do Rio de Janeiro. Este maciço é formado por dois corpos alcalinos: Marapicu e Mendanha que fazem parte do lineamento magmático Poços de Caldas-Cabo Frio. Este lineamento inclui dezenas de corpos ígneos alcalinos de idade Cretácea com uma direção preferencial WNW-ESE. Os litotipos mais abundantes do Maciço Marapicu são representados por nefelina sienitos e sienitos de caráter plutônico, além de, fonolitos c

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14

Santos, Ítalo Santana. "Magmatismos shoshonítico e cálcio-alcalino de alto potássio pós-orogênico (615 Ma) na porção leste do domínio Macururé, sistema orogênico sergipano : stocks Propriá, Amparo do São Francisco e Fazenda Alvorada." Pós-Graduação em Geociências e Análise de Bacias, 2017. http://ri.ufs.br/jspui/handle/riufs/8293.

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Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq<br>The Propriá, Amparo do São Francisco and Fazenda Alvorada stocks are intrusive in the eastern part of the Macururé Domain and cut the regional orientation. These stocks present similar geological and petrographic features and are essentially constituted by quartz monzonites and porphyritic granites. In these plutons biotite is the predominant mafic mineral and hornblende occurs in some enclaves. Plagioclase crystals exhibit path zoning indicating important instabilities during crystallization. The accessory

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15

Wu, Meiling, and 吴美玲. "Ages, geochemistry and metamorphism of the neoarchean basement in Shandong province : implications for evolution of the eastern block, North China Craton." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/196017.

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The Archean basement rocks in Shandong Province are important components of the Eastern Block in the North China Craton, consisting predominantly of granitoid gneisses with minor mafic and felsic supracrustal rocks and charnockites. They are exposed, from west to east, in the Luxi Granite-Greenstone Terrane, Yishui Terrane and Jiaodong Terrane, of which the low-grade Luxi Granite-Greenstone Terrane has been well studied, whereas little work has been done on the medium- to high-grade Yishui and Jiaodong Terranes. Controversies have long surrounded the timing of crustal growth and tectonic setti

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16

Kukkonen, S. (Soile). "Small impact craters in crater counting:evolution studies of the eastern Hellas outflow channels, Mars." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526218779.

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Abstract Crater counting is a method which allows us to estimate the surface ages of the planetary bodies, from which the sampling and sample delivery to laboratories on Earth are difficult or impossible. Because the number of craters on a surface unit increases over the time the surface has been exposed to space, old, geologically stable units have more craters than young and active units. When the crater production rate as a function of time is known, the absolute age of the surface unit can be determined based on its crater density. The purpose of this thesis is to investigate the role of s

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17

Gruber, Leonardo. "Geocronologia U-Pb em Zircão Detrítico aplicada ao estudo de proveniência de metassedimentos do Complexo Metamórfico Porongos – Região de Santana da Boa Vista, RS." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/56342.

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Estudos de proveniência em zircões detríticos através do método U-Th-Pb (LA-ICP-MS) dos metassedimentos do Complexo Metamórfico Porongos determinaram a existência de duas áreas-fontes principais de onde derivaram idades paleoproterozóicas e mesoproterozóicas para os xistos Arroio Areião, Cerro Cambará e quartzo milonitos associados. Foram obtidas idades entre 967 ± 15 Ma e 2454 ±26 Ma para a seqüência Arroio Areião, entre 894 ± 30 Ma e 2783 ± 18 Ma para a seqüência Cerro Cambará, e idades entre 1621 ± 16 Ma e 3185 ± 117 Ma para os quartzo milonitos associados. A área fonte com idades paleoprot

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18

Carter, Helen. "Uranium separations using extraction chromatography." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/11261.

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In the analysis of environmental samples for uranium and thorium pollutants and at natural levels for the dating of geological samples there was felt a need to develop better uranium and thorium separation procedures to replace the established anion exchange method used at AEA Technology plc. This was the first aim of the PhD research. Separation of uranium from thorium prior to measurement of the isotopes by alpha spectrometry was necessary due to the similar alpha energies of234U and 230Th. TRU and UTEVA extraction chromatography resins (EIChroM Industries) were investigated as potential rep

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19

D'ADDA, PAOLO. "Eo-alpine evolution of the central southern alps. Insights from structural analysis and new geochronological constraints." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/19018.

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The timing of the Alpine deformation in the Central Southern Alps (CSA or Orobic Alps) has always been a debated topic, since the scarcity of reliable absolute age constraints has prevented an accurate chronological reconstruction of the evolution of this sector of the European Alps. In this work, detailed structural analyses performed in different areas of the CSA allowed us to distinguish different compressive features within both the crystalline basement and the sedimentary cover. The integration of these field data with new isotopic data provides time constraints for the reconstruction o

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20

LIMONCELLI, MARTA. "Short-term erosion pattern in the Alps-Apennines belt constrained by downstream changes of zircons morphology and U-PB ages from the Po drainage modern sands." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/29393.

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Downstream changes of the geochronological signature in the Po drainage allow to assess the relative sediment contributions shed from the orogenic source areas, in order to constrain the short-term (102-104 y) erosion pattern in the Alps-Apennines orogenic couple. In this perspective, we collected modern sands in selected tributaries draining the major tectonic units exposed in the orogen, as well as along the Po River trunk and in different sites of the Po Delta. Zircon concentrates were separated according to specific quantitative procedures coupled with grain-size and grain-density analyse

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21

Avelar, Simone Cristina Pires. "Datação química U-Th-Pb de minerais dos albitidos uraniferos da região de Lagoa Real (BA) por microssonda eletrônica." CNEN - Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, 2008. http://www.bdtd.cdtn.br//tde_busca/arquivo.php?codArquivo=99.

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Nenhuma<br>Diversos trabalhos na literatura têm utilizado análises de U-Th-Pb obtidas por microssonda eletrônica para a datação química de episódios de fechamento do sistema U-Th-Pb em minerais. Tais episódios podem ser de natureza metamórfica, termal, intempérica ou ainda estar ligados a processos de fissão natural. Diferentes minerais de urânio e/ou tório contendo chumbo radiogênico têm sido analisados com esse propósito. Na região de Lagoa Real (BA) situa-se a única mina de urânio em atividade na América Latina, controlada pela INB (Indústrias Nucleares do Brasil). Os albititos, rochas port

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22

Greenhalgh, Brent W. "A Stratigraphic and Geochronologic Analysis of the Morrison Formation/Cedar Mountain Formation Boundary, Utah." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1392.pdf.

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23

BABINSKI, MARLY. "Idades isocronicas Pb/Pb e geoquimica isotopica de Pb das rochas carbonaticas do grupo Bambui na porcao sul da bacia do Sao Francisco." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10339.

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Made available in DSpace on 2014-10-09T12:37:32Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:17Z (GMT). No. of bitstreams: 1 05174.pdf: 4868507 bytes, checksum: ef4d7e8312562d1a1e608bf1fd65e9ec (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo

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Wijbrans, Jan Roelof. "Geochronology of metamorphic terrains by the ⁴⁰Ar/³⁹Ar age spectrum method." Phd thesis, 1985. http://hdl.handle.net/1885/140364.

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25

Tsukui, Kaori. "Chronology and Faunal Evolution of the Middle Eocene Bridgerian North American Land Mammal “Age”: Achieving High Precision Geochronology." Thesis, 2015. https://doi.org/10.7916/D8KS6R86.

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The age of the Bridgerian/Uintan boundary has been regarded as one of the most important outstanding problems in North American Land Mammal “Age” (NALMA) biochronology. The Bridger Basin in southwestern Wyoming preserves one of the best stratigraphic records of the faunal boundary as well as the preceding Bridgerian NALMA. In this dissertation, I first developed a chronological framework for the Eocene Bridger Formation including the age of the boundary, based on a combination of magnetostratigraphy and U-Pb ID-TIMS geochronology. Within the temporal framework, I attempted at making a regional

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26

Chen, Shang Min, and 陳尚民. "Mineralogy, petrology, and geological age of the ophiolite from aoyougou area, western section of north qilian mountains, NW China." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/17006814186114995630.

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碩士<br>國立成功大學<br>地球科學研究所<br>88<br>The ophiolite oxposed along Aoyougo ,western section of North Qilian Mountain，is of melange-type.The isolated ，exotic blocks of serpentinite，gabbro，diabase，and basalt were spililizedUnder a pressure-temperature condition equivalent to low greenschist Faces and their origiual minerals were partty replacedly albit，chlorite，epidote，actinolite，and carbonate minerals.The Cr-spinelsIn the serpentinite indicates that the ophilite was origiuated in the Serpentinite indicates that the ophiolite was origiuated in the are Or arc-related environment The Nd-Sm is

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27

Evans, Richard John. "Mafic, ultramafic and anorthositic rocks of the Tete complex, Mozambique : petrology, age and significance." Thesis, 2012. http://hdl.handle.net/10210/7460.

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M.Sc.<br>The ca. 800 km2 Tete Complex of NW Mozambique is located at the eastern end of the 830 ±30 Ma Zambezi Belt, near the transition zone into the Neoproterozoic Mozambique Belt. The Complex is located just south of the Sanangoe Shear Zone where Mesozoic and Late Palaeozoic cover rocks obscure much of the region. Country rocks immediately in contact with the Tete Complex include amphibolitic gneiss, graphite-bearing marble, calcsilicate gneiss, muscovite and biotite schist and quartzite of the Chidue Group. The Tete Complex may have been intrusive into the Chidue Group, although there is e

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Schaefer, B. F. "Isotopic and geochemical constraints on Proterozoic crustal growth from the Mt Painter Inlier." Thesis, 1993. http://hdl.handle.net/2440/88129.

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This item is only available electronically.<br>The Mt Painter Inlier comprises sequences of Palaeo-Mesoproterozoic metasediments, granitoids and granites. The igneous suites are geochemically similar to penecontemporaneous Australian I- and A-type granites, and contain elevated immobile element concentrations relative to Phanerozoic analogues. The metasedimentary sequences indicate shallow water, intracontinental depositional environments and isotope studies suggest short transport distance and local provenance. Nd depleted mantle model ages for the oldest granitoids and metasediments are c

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29

Gordee, Sarah Marie. "Volcanostratigraphy, age and geologic setting of the Lower-Middle Jurassic Upper Hazelton Group, west-central British Columbia." Thesis, 2006. http://hdl.handle.net/2429/17577.

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Lower and Middle Jurassic Hazelton Group rocks on the southwest margin of the Stikine Terrane (Stikinia) of the Canadian Cordillera are part of a widespread Early-Middle Jurassic arc assemblage. Upper Hazelton Group volcano-sedimentary strata host the world class, precious metal-enriched, polymetallic Eskay Creek volcanogenic massive sulphide (VMS) deposit in northwest Stikinia, as well as a number of epithermal and porphyry deposits in associated subvolcanic intrusions throughout central and northern Stikinia. Large segments of Hazelton Group strata are understudied, despite significant

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Cao, Zheng Hong, and 曹恕中. "The geological significances of illite crystallinity, zircon fission-track ages, and K-Ar ages of metasedimentary rocks of the central range of Taiwan." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/61589133333717691389.

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Wu, Cheng-Yin, and 吳承穎. "Fission-Track Ages of Apatite from Tachosui gneiss and their Geologic Implications." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/28090862141975998846.

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碩士<br>國立臺灣大學<br>地質科學研究所<br>97<br>Taiwan is located in a remarkable tectonic setting at the convergence between the Luzon arc and Eurasian plate. In order to understand the thermal history of the northern Tananao Schist of East. Taiwan, since the Penglai Orogeny, a total of nine bedrock samples were collected from the Tachosui Gneiss along the Hopin forest trail as a vertical transect within an area of few km2. The samples were analyzed by fission-track dating technique. The results and the localities of the sub-vertical section allowed us to discuss the relationship between elevation and apati

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"Provenance ages and timing of sedimentation of selected Neoarchean and Paleoproterozoic successions on the Kaapvaal Craton." Thesis, 2009. http://hdl.handle.net/10210/1945.

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Peltier, Carly. "The precise timing and character of glaciations in Patagonia from MIS 6 to the Little Ice Age." Thesis, 2021. https://doi.org/10.7916/d8-46v3-qr64.

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By only considering records of climate and glaciers over the period that humans have been monitoring them, one might think that climate normally changes quite rapidly, and that glaciers have always been small. But in the not-so-distant past, an ice sheet covered the Southern Andes, flowing across the southern tip of the continent, and in some places, even terminating into the Atlantic Ocean. Glaciers rewrite the surfaces they inhabit, leaving behind indicators of their past behavior. By studying the landforms they create, we can reconstruct climates of the past. Here I present unique and novel

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Gärtner, Andreas. "Geologic evolution of the Adrar Souttouf Massif (Moroccan Sahara) and its significance for continental-scaled plate reconstructions since the Mid Neoproterozoic." Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A30863.

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Located in the south of the Moroccan Sahara, the Adrar Souttouf Massif is the northern continuation of the Mauritanides at the western margin of the West African Craton. The massif itself exhibits a complex polyphase geologic history and contains four geologically different, SSW-NNE trending main units named from west to east: Oued Togba, Sebkha Gezmayet, Dayet Lawda, Sebkha Matallah. They are thrusted over each other in thin-skinned nappes with local windows of the discordantly overlain Archaean Reguibat basement. The eastern margin of the massif is bordered by the Tiris and Tasiast-Tijirit a

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35

Smith, O., G. Momber, R. Bates, et al. "Response to Comment on "Sedimentary DNA from a submerged site reveals wheat in the British Isles 8000 years ago"." 2015. http://hdl.handle.net/10454/9405.

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Yes<br>The Mesolithic-to-Neolithic transition marked the time when a hunter-gatherer economy gave way to agriculture, coinciding with rising sea levels. Bouldnor Cliff, is a submarine archaeological site off the Isle of Wight in the United Kingdom that has a well-preserved Mesolithic paleosol dated to 8000 years before the present. We analyzed a core obtained from sealed sediments, combining evidence from microgeomorphology and microfossils with sedimentary ancient DNA (sedaDNA) analyses to reconstruct floral and faunal changes during the occupation of this site, before it was submerged. In ag

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Sivachidambaram, S. "Studies on Modified Clay Additives to Impart Iodide Sorption Capacity to Bentonite in the Context of Safe Disposal of High Level Nuclear Waste." Thesis, 2012. http://etd.iisc.ac.in/handle/2005/3226.

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It is a generally agreed internationally that high level nuclear wastes containing long-lived radioactive wastes should be disposed in deep and stable geological formations that are 500-1000 m below ground level. Deep geological disposal is based on the concept of multiple barriers to prevent deep ground-waters, present in almost all rock formations, from rapidly leaching the wastes and transporting radioactivity away from the repository. The multiple barrier system comprises of ‘engineered barriers’ that are constructed in the repository and ‘natural barriers’ in the surrounding geological en

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Sivachidambaram, S. "Studies on Modified Clay Additives to Impart Iodide Sorption Capacity to Bentonite in the Context of Safe Disposal of High Level Nuclear Waste." Thesis, 2012. http://hdl.handle.net/2005/3226.

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It is a generally agreed internationally that high level nuclear wastes containing long-lived radioactive wastes should be disposed in deep and stable geological formations that are 500-1000 m below ground level. Deep geological disposal is based on the concept of multiple barriers to prevent deep ground-waters, present in almost all rock formations, from rapidly leaching the wastes and transporting radioactivity away from the repository. The multiple barrier system comprises of ‘engineered barriers’ that are constructed in the repository and ‘natural barriers’ in the surrounding geological en

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