EXPLORING GEOLOGICAL ENVIRONMENTS
EXPLORING GEOLOGICAL ENVIRONMENTS
Clay minerals play a pivotal role in various geological materials, making them a captivating area of study. Their presence in diverse environments, constantly influenced by human activity, has sparked significant interest across different fields, such as oil and petroleum research, environmental studies, and radioactive waste management. Wherever water and rock converge, clay minerals emerge as common byproducts of weathering, holding immense potential in the diagenetic evolution within sedimentary basins during sediment burial. The impact of clay minerals on hydrocarbon reservoirs cannot be understated, greatly influencing petroleum production efficiency. Moreover, they assume a crucial role in hydrothermal and weathering ore-forming processes, especially concerning the formation of strategic trace elements deposits. Our research focuses on exploring various geological contexts, ranging from deep sedimentary basins to weathering profiles, as we delve into the intricate structure, crystalochemistry, and reaction mechanisms that underlie the formation of clay minerals and related mineralizations
Sedimentary basins
Surface weathering and shallow diagenetic processes give birth to clays, which undergo transformative changes, ultimately leading to the development of mature clay mineral assemblages nestled within deep-seated sedimentary layers. In subduction zones, the breakdown of clay minerals unleashes a hydrous component that plays a crucial role in magma generation. Once igneous rocks are formed, they undergo weathering and recycling, giving rise to new clay minerals, thus completing the captivating magma-to-mud pathway of the clay cycle. In sedimentary basins, diagenetic reactions strive for heightened thermodynamic stability, a subject extensively explored since the 1970s in relation to diagenesis and quality prediction of conventional reservoirs. The advent of modern analytical tools has revolutionized the precise quantitative and qualitative characterization of nano-pores and mineralogy in fine-grained shale, ushering in a new era of studying clay minerals and their invaluable contribution to the exploration of unconventional reservoirs. Our current investigation focuses on Paleozoic mudrocks sourced from the Mid-Continent Anadarko and Permian basins, where we seek physico-chemical clues that shed light on the intricate mechanisms governing clay mineral evolution in deeply buried shaley strata
Photo by B. Šegvić (Bituminous Woodford Shale, Arbuckle Mts., Oklahoma, U.S.A.)
Weathering and trace-element mineralization
Trace elements, especially rare earths (REE), are vital in modern technologies and industrialized nations' lifestyles. Their applications are ubiquitous and indispensable. While major REE deposits are typically in weathered granitic crust, our research pioneers by focusing on volcanic ash. We employ in-situ geochemical micro-analyses of glass shards and immediate clay alteration products. Trace elements in clays reside on broken edge sites or negatively charged siloxane surfaces, forming adsorbed complexes with clay minerals. Our research examines the intricate behavior and distribution of REEs, considering local geology factors like Eh, pH, water-rock interaction, trace element complexation, and clay particle morphology. Understanding the distribution of REEs within clays formed on rare earth-bearing igneous substrates aids in identifying promising regions for future exploration. Through our endeavors, we aim to unlock insights shaping the future of REE exploration.
Figure from Badurina and Šegvić (2022) showing smectite neoformation on a glassy substrate. Field of view 5 μm
The alteration intensities within hydrothermal systems have been found to exhibit intriguing heterogeneity. It's fascinating to observe how rocks bear evidence of multiple modification events, each leaving its unique imprint characterized by specific temperature conditions and the composition of catalytic fluids involved. The outcome of hydrothermal impact is a diverse array of alteration assemblages dominated by hydrous phases such as clay minerals. Phyllosilicates serve as a particularly useful tool in evaluating the conditions and nature of reacting fluids and readily form the distinct alteration zones useful for vectoring towards valuable epithermal mineralizations. Our current research showcases the role of chlorite minerals and their trace element budget providing inferences on the controlling variables on REE mobility in hydrothermal systems.
Figure from Byerly et al. (2023) showing multiple generations of hydrothermal pumpellyite and chlorite filling an amygdale in altered basalt. Field of view 10 μm
Hydrothermal clays - ore mineralization proxies and potential REE hosts?
Our Team
Assistant Professor
Branimir Šegvić
M.S. University of Zagreb, Croatia
Ph.D. University of Heidelberg, Germany
e-mail: Branimir.Segvic@ttu.edu
Ph.D. Student and Teaching Assistant
Emily E. Doyle
B.S. Salem State University
M.S. Texas Tech University
e-mail: emdoyle@ttu.edu
Emily works on an interdisciplinary project which seeks to outstands cultural traditions and interactions of pottery producing prehistoric societies dwelling in an insular context of Eastern Adriatic.
Ph.D. Candidate
Hunter Green
B.S. Wayland Baptist University
M.S. Fort Hays State University
e-mail: H.Green@ttu.edu
Hunter's doctoral project has a focus on the late Paleozoic shale of the Permian basin of Texas. He is studying organo-clay composites in mudrocks and their influence on clay diagenesis and thermal maturation.
M.S. Student and Teaching Assistant
Kevin Byerly
B.S. Texas Tech University
e-mail: Kevin.Byerly@ttu.edu
Kevin project seeks to provide answers on why multiple generations of chlorite formed in hydrothermally altered oceanic rocks feature contrasting trace-element budgets.
M.S. Student and Teaching Assistant
Evans Akuoko Ansah
B.S. Kwame Nkrumah University of Science and Technology, Ghana
e-mail: aevansak@ttu.edu
Evans works on Paleozoic clastic series affected by a large-scale siderite cementation trying to assess its impact on basin burial diagenesis.
Ph.D. Student and Teaching Assistant
Oluwaseye Peter Oyetade
B.S. University of Ilorin, Nigeria
M.S. Obafemi Awolowo University, Nigeria
e-mail: ooyetade@ttu.edu
Oluwaseye's research is about hydrothermal chlorite and its trace-element retention capabilities. The investigation includes a series of experiments such as laser-ablation ICP-MS on chlorite separates and in-house developed leaching methodology.
M.S. Student and Research Assistant
Bethany Morgan
B.S. Texas Tech University
e-mail: Bethany.Morgan@ttu.edu
Bethany's work aims to understand the influence of the evolving depositional environments in West Texas on the mineralogy and trace-element geochemistry of the alteration products of Plio-Quaternary ash layers present throughout the region.
Our Alumni
Former M.S. Student
Jordan Coe
Graduated in December 2019
Jordan's master project focused on the diagenesis of the Pennsylvanian clastic reservoirs of the Anadarko Basin
in Oklahoma, USA. PDF of the thesis is avaliable here.
Former M.S. Student
Colton Mallett
Graduated in April 2021
Colton studied paleosol profiles within the Black Water Draw Formation of Southern High Planes of Texas. The aim of the project was to investigate clay mineralogy and geochemistry of the Formation in order to add to the discussion on the Quaternary climate evolution across the Mid-Continent. PDF of the thesis is available here.
Former M.S. Student
Owen Smith
Graduated in May 2022
Owen's research aimed to understand the origin and formation mechanisms of siderite cementation and concretions in Late Paleozoic siliciclastic rocks of the Anadarko Basin, OK. PDF of the thesis is available here. Owen received Texas Tech University Outstanding Thesis Award for 2022 in the category of Mathematics, Physical Sciences, and Engineering (link).
Former M.S. Student
Emily E. Doyle
Graduated in June 2022
Emily's project focused on the ceramic material culture of the Iron Age and Hellenistic communities of Eastern Adriatic. She investigated plausible raw materials readily available at the island of Hvar which were used in the ceramic pottery production by the both communities. PDF of the thesis is available here.
Former Ph.D. Student
Luka Badurina
Graduated in May 2023
Luka's project dealt with alteration products of Neogene tuffs dispersed within the Dinaride Lake System in SE Europe. He was studying the REE behavior during tuff alteration paying particular attention to organic and inorganic controls on tuff eogenesis. PDF of the dissertation is available here.
Publications
Selected Journal Papers
Smith, O; Segvic, B; Sweet, D ‘Understanding siderite mineralization in phyllosilicate-associated cementations in the Mid-Carboniferous Anadarko Basin clastic series, U.S.A.’// Journal of Sedimentary Research (2024), DOI: 10.2110/jsr.100
Segvic, B; Lukács, R; Mandic, O; Strauss, P; Badurina, L; Gullong, M; Harzhauser, M ‘St. Georgen halloysite tuff U-Pb zircon age, provenance, and paleoenvironmental implication for middle Miocene evolution of the southern Vienna Basin, Austria’ // Journal of the Geological Society London (2023), DOI: 10.1144/jgs2022-106
Leila, M; Moscariello, A; Sweet, D; Segvic, B ‘Diagenetic signatures in the deltaic and fluvial-estuarine Messinian sandstone reservoirs in the Nile Delta, Egypt: implications for high-resolution stratigraphic correlations’// International Journal of Sediment Research (2023), DOI: /10.1016/j.ijsrc.2023.05.002
Yang, Y; Liu, Y; Segvic, B; Zhou, D; You, J; Meng, Z; Zhao, M ‘Origin, transport, and diagenesis of tuff interbeds in organic-rich lacustrine mudstone: An example from the lower part of the Middle–Late Triassic Chang7 Member, Ordos Basin (NW China)’// Applied Clay Science (2023), DOI: 10.1016/j.clay.2022.106790
Segvic, B; Slovenec, D; Badurina, L ‘Major and rare earth element mineral chemistry of low-grade assemblages inform dynamics of hydrothermal ocean-floor metamorphism in the Dinaridic Neotethys’// Geological Magazine (2023), 160(3), 444-470, DOI: 10.1017/S0016756822001030
Kukoc, D; Smircic, D; Grgasovic, T; Horvat, M; Belak, M; Japundzic D; Kolar-Jurkovsek, T; Badurina, L; Segvic, B; Vukovski, M; Slovenec, D ‘Biostratigraphic constraints and facies description of Middle Triassic volcano-sedimentary rift related successions from the junction of the Southern Alps and the Dinarides (NW Croatia)’// International Journal of Earth Sciences (2023), DOI: 10.1007/s00531-023-02301-w
Grizelj, A; Milosevic, M; Miknic, M; Hajek-Tadesse, V; Bakrac, K; Galovic, I; Badurina, L; Kurecic, T; Wacha, L; Segvic, B; Matosevic, M; Caic-Jankovic, A; Avanic, R ‘Evidence of Early Sarmatian volcanism in the Hrvatsko Zagorje Basin, Croatia - mineralogical, geochemical and biostratigraphic approach’ // Geologia Carpathica (2023), 74(1), 59-82, DOI: 10.31577/GeolCarp.2023.02
Zanoni, G; Segvic, B; Sweet, D ‘Clay mineral diagenesis in alternating mudstone-sandstone beds from Late Paleozoic strata of the Anadarko Basin, USA’// Geological Journal (2023), 58, 1, 108-130, DOI: 10.1002/gj.4582
Badurina, L; Segvic, B ‘Assessing trace-element mobility during alteration of rhyolite tephra from the Dinaride
Lake System using glass and clay separate LA-ICP-MS geochemistry’// Clay Minerals - Journal of Fine Particle Science (2022), DOI: 10.1180/clm.2022.12
Schmidt, E; Zanoni, G; Bumguardner, A; Segvic, B; Lewis, K; Abdala, D; Siebecker, M ‘Soil chemical extractions can alter potassium coordination in agricultural soils: A combined wet chemical and X-ray absorption spectroscopic approach’// Geoderma (2022), 422, DOI: 10.1016/j.geoderma.2022.115914
Carloni, D; Segvic, B; Sartori, M; Zanoni, G; Besse, M ‘Who was buried at the Petit-Chasseur site? The contribution of archaeometric analyses of Final Neolithic and Bell Beaker domestic pottery to the understanding of the megalith-erecting society of the Upper Rhône Valley (Switzerland, 3300-2200 BC)’// Open Archaeology (2022), 8, 1064–1111, DOI: 10.1515/opar-2022-0262
Kolawolea, O; Millikan, C; Ispas, I; Schwartz, B; Kumar, M; Weber, J; Badurina L; Segvic, B ‘Insight into the Impact of Microbial-Rock-CO2 Interactions on Containment and Storage Security of Supercritical CO2 in Carbonates’// International Journal of Greenhouse Gas Control (2022), 120, 103755, DOI: 10.1016/j.ijggc.2022.103755
Segvic, B; Zanoni, G; Bozkaya, Ö; Barnes, M; Sweet, D; Boulesteix, T; Solé, J ‘K-Ar geochronology and trace-element geochemistry of 2M1 illite from late Paleozoic shale of SW Laurentia – insights into sediment origin and drainage pathways in the Anadarko Basin, USA’// Palaeogeography, Palaeoclimatology, Palaeoecology (2021), DOI: 10.1016/j.palaeo.2021.110486
Leila, M; Lévy, D; Battani, A; Piccardi, L; Segvic, B; Badurina, L; Pasquet, G; Combaudon, V; Moretti, I ‘Origin of continuous hydrogen flux in gas manifestations at the Larderello geothermal field, central Italy’// Chemical Geology (2021), DOI: 10.1016/j.chemgeo.2021.120564
Badurina, L; Segvic, B; Mandic, O; Slovenec, Da ‘Miocene Tuffs from the Dinarides as Proxies of the Pannonian Basin Lithosphere Dynamics and Tropospheric Circulation Patterns in Central Europe’// Journal of the Geological Society (2021), DOI: 10.1144/jgs2020-262
Arbiol González, C; Layne, DL; Zanoni, G; Segvic, B ‘Genesis and significance of phyllosilicate hydrothermal assemblages from Neo-Proterozoic epithermal Au-Ag deposits and prospects of the Avalon Zone of Newfoundland, Canada’// Applied Clay Sciences (2021), DOI: 10.1016/j.clay.2020.105960
Carloni, D; Segvic, B; Sartori, M; Zanoni, G; Moscariello, A; Besse, M ‘Material characterization of the 3rd millennium BC pottery: insights in the megalith-erecting society of the Upper Rhône Valley (the Petit Chasseur necropolis, Switzerland)’ // Geoarchaeology (2021), 1-36, DOI: 10.1002/gea.21867
Segvic, B; Zanoni, G; Moscariello, A ‘On the Origins of Eogenetic Chlorite in Verdine Facies Sedimentary Rocks’// Marine and Petroleum Geology (2020), DOI: 10.1016/j.marpetgeo.2019.104064
Badurina, L; Segvic, B; Mandic, O; Zanoni, G ‘Smectitization as a trigger of bacterially mediated Mn-Fe micronodule generation in felsic glass (Livno-Tomislavgrad Paleolake, Bosnia and Herzegovina)’// Minerals (2020), 10(10), 899, DOI: 10.3390/min10100899
Green, H; Segvic, B; Zanoni, G; Omodeo Salé, S; Adatte, T ‘Evaluation of shale source rocks and clay mineral diagenesis in the Permian Basin, USA: Inferences on basin thermal maturity and source rock potential’// Geosciences (2020), 10(10), 381, DOI: 10.3390/geosciences10100381
Khadka, SD; Jayawickrama, PW; Senadheera, S; Segvic, B ‘Stabilization of highly expansive soils containing sulfate using metakaolin and fly ash based geopolymer modified with lime and gypsum’// Transportation Geotechnics (2020), DOI: 10.1016/j.trgeo.2020.100327
Pevehouse, KJ; Sweet, DE, Segvic, B; Barnes MA; Marshak, S; Manson, C; Zanoni, G ‘Topography Controlled Weathering Intensity of Cambrian Paleosols, ST. Francois Mountains, SE Missouri, U.S.A.’// Journal of Sedimentary Research (2020), 90 (6): 629–650, DOI: 10.2110/jsr.2020.33
Tarokh, A; Kim, K; Zhu, X; Makhnenko, RY; Popovics, JS; Segvic, B; Sweet, DE ‘Influence of CO2 injection on the poromechanical response of Berea sandstone’// International Journal of Greenhouse Gas Control (2020), DOI: 10.1016/j.ijggc.2020.102959
Monson, CC; Sweet, DE; Segvic, B; Zanoni, G; Balling, K; Wittmer, JM; Ganis, GR ‘The Late Ordovician (Sandbian) Glasford Structure: A marine-target impact crater connected to the ‘Ordovician meteor event‘// Meteoritics and Planetary Science (2019), DOI: 10.1111/maps.13401
Slovenec, Da; Segvic, B; Halamic, J; Gorican, S; Zanoni, G ‘An ensialic volcanic arc along the northwestern edge of Paleotethys? – insights from the Mid-Triassic volcano-sedimentary succession of Ivanščica Mt. (northwestern Croatia)’// Geological Journal (2019), DOI: 10.1002/gj.3664
Leila, M; Moscariello, A; Segvic, B ‘Depositional facies controls on the diagenesis and reservoir quality of the Messinian Qawasim and Abu Madi formations, onshore Nile Delta, Egypt’// Geological Journal (2019), 54(3), 1797-1813, DOI: 10.1002/gj.3269
Segvic, B; Slovenec, Da; Altherr, R; Babajic, E; Ferrerio Mählmann, R; Lugovic, B ‘High-grade metamorphic soles from the Central Dinaric Ophiolite Belt and their significance for the Neotethyan evolution in the Dinarides’// Ofioliti (2019), 44(1), 1-30, DOI: 10.4454/ofioliti.v44i1.462
Slovenec, Da; Segvic, B ‘Boninitic volcanism in the NW Dinaric-Vardar ophiolite zone (Mt. Medvednica, Croatia): petrology, geochemistry and tectono-magmatic evidences for existence Middle-Late Jurassic arc-forearc system in Tethyan subduction factories’// Mineralogy and Petrology (2019), 113, 17-37, DOI: 10.1007/s00710-018-0637-0
Segvic, B; Girardclos, S; Zanoni, G; Arbiol González, C; Steimer-Herbet, T; Besse, M ‘Origin and Paleoenvironmental Significance of Fe-Mn Nodules in the Holocene Perialpine Sediments of Geneva Basin, Western Switzerland’// Applied Clay Sciences (2018), 60, 22-39, DOI: 10.1016/j.clay.2018.01.027
Cuadros, J; Segvic, B; Dekov, V; Michalski, J; Baussà Baradaji, D ‘Electron microscopy investigation of the genetic link between Fe oxides/oxyhydroxides and nontronite in submarine hydrothermal fields’// Marine Geology (2018), 395, 247-259, DOI: 10.1016/j.margeo.2017.10.011
Leila, M; Moscariello, A; Segvic, B ‘Geochemical constraints on the provenance and depositional environment of the Messinian sediments, onshore Nile Delta, Egypt: Implications for the Late Miocene paleogeography of the Mediterranean’// Journal of African Earth Sciences (2018), 143, 215-241, DOI: 10.1016/j.jafrearsci.2018.03.024
Mahrous, M*; Segvic, B; Zanoni, G; Khadka, SD; Senadheera, S; Jayawickrama, PW ‘The role of clay swelling and mineral neoformation in the stabilization of high plasticity soils treated with fly ash and metakaolin based geopolymers’// Minerals (2018), 8(4), 146, DOI:10.3390/min8040146
Benvenuti, A*; Segvic, B; Moscariello, A ‘Tunnel valley deposits from the southern North Sea ˗ material provenance and depositional processes‘// Boreas (2018), 47 (2), 625-642, DOI: 10.1111/bor.12292
Slovenec, Da; Segvic, B ‘The first record of ultramafic cumulates from the Mt. Kalnik ophiolite mélange in the SW part of the Zagorje-Mid-Transdanubian Zone (NW Croatia): mineralogy, petrology, geochemistry and tectono-magmatic affinity’// Geologia Croatica (2018), 71(3), 185-197, DOI: 10.4154/gc.2018.17
Stutenbecker, L*; Delunel, R; Schlunegger, F; Adrião Silva, T; Segvic, B; Girardclos, S; Bakker, M; Costa, A; Lane, S; Loizeau, J-L; Molnar, P; Akçar, N; Christl, M ’Reduced sediment supply in a fast eroding landscape? A multi-proxy sediment budget of the upper Rhône basin, Central Alps’// Sedimentary Geology (2018), 375, 105–119, DOI: 10.1016/j.sedgeo.2017.12.013
Ragusa, J*; Kindler, P; Segvic, B; Ospina-Ostios, L. M ‘Provenance analysis of the Voirons Flysch (Gurnigel nappe, Haute-Savoie, France): Stratigraphic and paleogeographic implications‘// International Journal of Earth Sciences (2017), 106 (8), 2619-2651, DOI: 10.1007/s00531-017-1474-9
Segvic, B; Benvenuti, A; Moscariello, A ‘Illite-smectite rich clay parageneses from Quaternary tunnel valley sediments of the Dutch Southern North Sea - mineral origin and paleoenvironment implications‘// Clays and Clay Minerals (2016), 64 (5), 488-507, DOI: 10.1346/CCMN.2016.064026.
Zanoni, G*; Segvic, B; Moscariello, A ‘Clay mineral diagenesis in Cretaceous clastic reservoirs from west African passive margins (the South Gabon Basin) and its impact on regional geology and basin evolution history’// Applied Clay Sciences (2016), 134 (3), 186-209, DOI: 10.1016/j.clay.2016.09.032
Segvic, B; Lugovic, B; Slovenec, Da; Meyer, H-P ‘Mineralogy, petrology and geochemistry of amphibolites from the Kalnik Mt. (Sava Unit, North Croatia): Implications for the evolution of north-westernmost part of the Dinaric-Vardar branch of Mesozoic Tethys’// Ofioliti (2016), 41 (1), 35-58, DOI: 10.4454/ofioliti.v41i1.441
Segvic, B; Ugarkovic, M; Süssenberger, A; Ferreiro Mählmann, R; Moscariello, A ‘Compositional properties and provenance of Hellenistic pottery from the necropolis of Issa with evidences on the cross-Adriatic and the Mediterranean-scale trade’// Mediterranean Archaeology & Archaeometry (2016), 16 (1), 23-52, DOI: 10.5281/zenodo.44773
Segvic, B; Kukoc, D; Dragicevic, I; Vranjkovic, A; Brcic, V; Gorican, S; Babajic, E; Hrvatovic, H; ‘New record of Middle Jurassic radiolarians from mélange of the Central Dinaridic Ophiolite Zone (CDOB) and its implications to Neotethyan dynamics in the Dinarides’// Ofioliti (2014), 39 (1), 31-41, DOI: 10.4454/ofioliti.v39i1.427
Segvic, B; Mileusnic, M; Aljinovic, D; Vranjkovic, A; Mandic, O; Pavelic, D; Dragicevic, I; Ferreiro Mählmann R ‘Magmatic Provenance and Diagenesis of Miocene Tuffs from the Dinaride Lake System (The Sinj Basin, Croatia)’// European Journal of Mineralogy (2014), 26 (1), 83-101, DOI: 10.1127/0935-1221/2013/0025-2350
Uzarowicz, Ł; Segvic, B; Michalik, M; Bylina, P ‘The effect of hydrological conditions and the pH of environment on phyllosilicate transformations in the weathering zone of pyrite-bearing schists in Wieściszowice (SW Poland)’// Clay Minerals (2012), 47, 401–417, DOI: 10.1180/claymin.2012.047.4.01
Segvic, B; Seselj, L; Slovenec, Da; Lugovic, B; Ferreiro Mählmann, R ‘Composition, Technology of Manufacture, and Circulation of Hellenistic Pottery from the Eastern Adriatic: A Case Study of Three Archaeological Sites along the Dalmatian Coast, Croatia’// Geoarchaeology (2012), 27 (1), 63-87. DOI: 10.1002/gea.21379
Ferreiro Mählmann, R; Le Bayon, R; Bozkaya, Ö; Potel, S; Segvic, B; Nieto García, F ‘Clay mineral diagenesis/very low-grade metamorphic processes - The pioneer work of Bernhard Kübler and Martin Frey in very low-grade metamorphic terraines: Palaeo-geothermal potential of Kübler-Index – organic matter reflectance correlation’// Swiss Journal of Geosciences (2012), 105, 121-152. DOI: 10.1007/s00015-012-0115-3
Uzarowicz, Ł; Skiba, S; Skiba, M; Segvic, B ‘Clay mineral formation in soils developed in a pyrite-bearing schists weathering zone: a case study from the abandoned pyrite mine in Wieściszowice (Lower Silesia, SW Poland)’// Clays and Clay Minerals (2011), 59 (6), 581-594. DOI: 10.1346/CCMN.2011.0590604
Kandler, K; Schütz, L; Jäckel, S; Lieke, K; Emmel, C; Müller-Ebert, D; Ebert, M; Scheuvens, D; Schladitz, A; Segvic, B; Wiedensohler, A; Weinbruch, S ‘Ground-based off-line aerosol measurements at Praia, Cape Verde, during the Saharan Mineral Dust Experiment: Microphysical properties and mineralogy‘// Tellus B (2011), 63 (4), 459–474. DOI: 10.1111/j.1600-0889.2011.00546.x
Lugovic, B; Segvic, B; Segvic, T ‘Mn-crust todorokite mineralization on SW backshore Cretaceous limestones from the island of Dugi Otok (Central Adriatic, Croatia)’// Acta Adriatica (2008), 49, 55-64.
Segvic, B; Lugovic, B; Tadej, N; Bermanec, V; Panjkota, L ‘Si-P impure Al-goethite mineralization on the island of Dugi Otok (Central Adriatic, Croatia)’// Geologia Croatica (2008), 61, 139-147. DOI: 10.4154/GC.2008.04
Lugovic, B; Segvic, B; Altherr, R ‘Petrology and tectonic significance of greenschists from the Medvednica Mts (Sava Unit, NW Croatia)’// Ofioliti (2006), 31, 39-50. DOI: 10.4454/ofioliti.v31i1.326
News
OCTOBER 2021
Sumedh at the GSA2021 in Portland, OR.