I. Tonguc Uysal

I. Tonguc Uysal
İstanbul University-Cerrahpaşa · Department of Geological Engineering

PhD
International Senior Research Scientist: TÜBITAK; Lecturer: Istanbul Universitesi-Cerrahpaşa/TURKEY

About

155
Publications
34,402
Reads
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2,172
Citations
Additional affiliations
August 2016 - present
The Commonwealth Scientific and Industrial Research Organisation - CSIRO
Position
  • Researcher
August 2014 - August 2016
Hacettepe University
Position
  • Fellow
January 2000 - July 2014
The University of Queensland
Position
  • Research Associate

Publications

Publications (155)
Article
Full-text available
The socle stones of the Great Temple in the Lower City of the Hittite capital city, Hattusha (Çorum Province) have been studied for the first time by petrographic and geochemical analysis (Sr isotope, stable isotope, and trace element geochemistry). Study objectives were to determine the carbonate facies of the stone samples used in the Great Templ...
Article
Boron and lithium were analyzed in three nanometer-sized (<20, 20-50 and 50-100 nm) separates of two Santonian (85.8-83.5 Ma) bentonite samples collected closely in the Campos Basin along the southeastern Atlantic coast (Brazil). The B and Li data give various trends that suggest varied crystallization conditions for separates that consist of overw...
Article
We dated syntectonic calcites on fault planes from the southern branch of the western North Anatolian fault (NAF) in northern Turkey using U-Th geochronology. We selected strike-slip faults that are kinematically related to the current regional strain field. The isotopic ages cluster around different periods during the past ∼700 k.y. The most promi...
Article
Full-text available
A combined ultrasonic treatment, with de-ionized H2O, dilute HAc or dilute HCl, of three Mid-Miocene glauconite samples was applied to K–Ar date the different separates in order to compare the results with those obtained by the Rb–Sr method using the same three samples and that were analyzed strictly in the same way. Two aliquots yield opposite ele...
Article
Sequential leaching was completed by successive interactions of ultra-pure H2O, HAc, HCl and HNO3 with silicified/carbonated Archaean whole rocks from Barberton Greenstone belt of South Africa. The purpose of this experiment was an identification of the minerals interacting with each reagent and, therefore, a detailed succession of isotopically dat...
Research
Full-text available
Authigenic illite, 1M polytype, separated from a <0.1 μm clay fraction in recovered fault gouge and dated by K-Ar reveals the most recent movement on that fault. Samples collected from the faulted Edmund and Collier Groups (1673 -- 1067 Ma), Capricorn Orogen, Western Australia identify the Kuparr Tectonic Event (885–782 Ma). Additional samples reve...
Article
This study's goal is to understand the structural events and episodes of fluid flow recorded in calcium carbonate precipitation sampled in Mariana forearc serpentine mud volcanoes. Those active mounts provide a unique window to deep structural and fluid flow events affecting the subduction channel mélange zone and the subducted Pacific Plate. To bu...
Article
The history of thermal and fluid flow events is of crucial importance to understand the mechanism of hydrocarbon maturation. The northern South China Sea (SCS) contains abundant hydrocarbon resources with high heat flow anomalies, but the mechanisms responsible for modification of thermal regimes are poorly understood. Here we conducted the first h...
Article
Bauxite is the world’s main source of aluminum and typically consists of gibbsite, boehmite, and minor amounts of diaspore. However, bauxite deposits from the North and South China blocks consist mostly of diaspore and associated minerals, including anatase and illite. Much of this illite is authigenic and occurs as three polytypes (1M, 1Md, and 2M...
Article
Full-text available
Accurately determining the age of hydrothermal ore deposits is difficult, because of lack of suitable mineral chronometers and techniques. Here we present the first LA-MC-ICPMS U-Pb age of carbonates from hydrothermal Sb deposits. Three stages of hydrothermal carbonates from the giant South China Sb metallogenic belt were identified: (i) pre-ore do...
Conference Paper
Full-text available
The economic potential for unconventional shale oil and gas production in the Silurian of the Berkine-Ghadames and Illizi basins (BGI) was recently confirmed through exploration drilling in southeastern Algeria. The conducted research focuses on the southern margin of the prolific BGI basins, i.e. the Tassili n'Ajjer plateau, and aims to understand...
Article
Discrepancies in earthquake characteristics between geodetically determined and geologically observed slip rates are prominent for the eastern part of the North Anatolian Fault (NAF) zone. We investigated the spatial distribution of deformation across a NAF fault segment near Erzincan, NE Turkey, through field observations of physiographic features...
Article
K-Ar isotopic dating has been applied to alkali-rich nanometer-sized illite separates of bentonites since the late 1990s. In the present study, K-Ar and Rb-Sr isotopic analyses were based on mineralogical determinations and morphological observations of similarly nm-sized separates (<0.02, 0.02–0.05, and 0.05–0.1 μm) depleted in alkalis and recover...
Article
Full-text available
Australian terranes concealed beneath Mesozoic cover record complex Precambrian tectonic histories involving a successive development of several Proterozoic to Palaeozoic orogenic systems. This study presents an integrated approach combining K–Ar, 40Ar–39Ar, and Rb–Sr geochronologies of Precambrian authigenic illites from the recently discovered Mi...
Article
Full-text available
K-Ar dating of fault gouge from the intersection of the WNW-striking Ohika Detachment of the Paparoa Metamorphic Core Complex and a NNE-striking high-angle normal fault (Ohikaiti Fault) yielded an age of 103 ± 3.5 Ma (1σ uncertainty) for metamorphic white mica and an age of 35.2 ± 2.3 Ma for fault-gouge formation. The K-Ar four-point isochron is we...
Preprint
In the easternmost segment of the North Anatolian Fault (NAF) zone there are discrepancies in earthquake characteristics arising from differences between geodetically determined and geologically observed slip rates. We investigated the spatial distribution of deformation across a NAF fault segment, Turkey. Field observations were conducted on the o...
Article
We investigate the temporal variations in stable carbon and oxygen and radiogenic Sr isotope as well as rare earth element contents of Akkaya travertine deposits in the Eskipazar region, northwest Turkey. U-Th age data indicate that studied travertines in the periphery of the 1944-earthquake rupture of the North Anatolian Fault Zone formed in a tim...
Preprint
Full-text available
Abstract. Australian terranes concealed beneath Mesozoic cover record complex Precambrian tectonic histories involving a successive development of several Proterozoic to Paleozoic orogenic systems. This study presents an integrated approach combining K–Ar, <sup>40</sup>Ar–<sup>39</sup>Ar, and Rb–Sr geochronology of Precambrian authigenic illites fr...
Article
We investigated two stalagmites from the Saripa Cave and Bumi Cave in southern Sulawesi, Indonesia, using high-precision U-series dating and high-resolution trace element and C-O-Sr isotope analysis. The growth record (from 10.4 ± 0.1 ka to 77.4 ± 0.9 ka) of the Saripa Cave stalagmite (SR04-ST3) is fragmented with two major (at the top: 10.4–11.6 k...
Article
The Proterozoic (~1.43 Ga) Velkerri Formation (McArthur Basin, Northern Territory) is believed to host one of the world’s oldest petroleum systems. Drilling and production tests demonstrated the encouraging potential of this unconventional gas resource and current efforts are aimed at better defining the extent of the gas and liquid-rich portions o...
Article
Full-text available
Bangong-Nujiang Suture Zone (BNSZ) in central Tibet plays an important role in evaluating the formation and uplift mechanism of Tibetan Plateau. However, its Mesozoic tectonic evolution is ambiguous and intensely debated. In this study, Early Cretacesous adakites and sodium-rich arc rocks are identified in Western Qiangtang (WQ) and Northern Lhasa...
Article
The understanding of the relationship between the geochemistry of fluids circulating during travertine deposition and the presence of active faults are crucial for evaluating the seismogenetic potential of an area. Here, we investigate travertines from Pamukkale and Reşadiye (Turkey), sited in seismic regions and next to thermal springs. These trav...
Conference Paper
Full-text available
The Kışladağ porphyry gold deposit is related to Miocene intrusive and sub-volcanic rocks that resulted from an extensional tectonic regime in western Anatolia. The main lithologies of the deposit are quartz-trachytes to quartz-latites and volcanoclastic rocks intruded by sub-volcanic porphyritic rocks. Three different intrusive phases which have b...
Article
Full-text available
U-Th dating of carbonate veins in connection with active tectonics has recently been used as an attractive tool for constraining the absolute timing of late Quaternary crustal deformations. In this study, for the first time we correlate U-Th ages of travertine deposits in co-seismic fissures along the North Anatolian Fault Zone (NAFZ) with records...
Article
Calcite veins are commonly found at shallow depth (a few metres below the surface) in damage zones of active normal fault systems in southwest Turkey. Although earlier studies demonstrated the link between the vein formation and seismicity, the association of near-surface carbonate precipitation with climate-driven hydrological conditions is poorly...
Article
Full-text available
New ages and strain analysis of syntectonic calcite from the west-central part of the North Anatolian fault zone (NAFZ; northern Turkey) shed light on the debate over the origin and reactivation behavior of this major active fault system. Contrasting views suggest that the west-central part of the NAFZ was already active during the mid-Eocene, mid-...
Preprint
Full-text available
U-Th dating of carbonate veins in connection with active tectonics has recently been used as an attractive tool for constraining the absolute timing of late Quaternary crustal deformations. In this study, for the first time we correlate U-Th ages of travertine deposits in co-seismic fissures along the North Anatolian Fault Zone (NAFZ) with records...
Article
Full-text available
Çöpler porfiri-epitermal altın yatağı, Tetis Alpin-Himalaya orojenik kuşağında açılmalı tektonizma sonucu gelişen orta Eosen yaşlı plütonik sokulumlarla ilişkili bir altın yatağıdır. Plütonik kayaçlar (granodiyorit porfir, diyorit porfir) Geç Paleozoyik-Mesozoyik yaşlı metapelit ve metakarbonat kayaçlar içerisine sokulum yaparak porfiri-epitermal b...
Article
Full-text available
Eastern Gondwana was subjected to subduction processes during the Middle-Late Jurassic, but how these processes affected intraplate deformation in eastern Australia is poorly understood. Here we present ⁴⁰Ar/³⁹Ar, K-Ar, and Rb-Sr geochronological data from illitic clay-bearing fault gouges associated with the northern part of the 200 km long, N-str...
Conference Paper
Full-text available
The study area is located in the Tassili n'Ajjer plateau in the southeastern part of the Algerian Saharan Platform near the Hoggar Massif. Outcrops along the Tassili n'Ajjer plateau offer exceptional exposure of Silurian sections and more specifically the Oued Imihrou 'graptolite-rich black shales' Formation (Djouder et al., 2018). Furthermore, the...
Conference Paper
Full-text available
Bir bölgenin depremselliği o bölgede yer alan aktif faylarla belirlenmektedir. Ancak bu tür fayların bulunmadığı/az olduğu veya sismik etkinliğin seyrek gözlendiği alanlarda sağlıklı veri elde edebilmek için farklı jeolojik belirteçlere ihtiyaç duyulmaktadır. Kayaçlarda bulunan tektonik kökenli damarlar bunlara güzel bir örnektir. Geliştirilen yeni...
Article
The origin of elevated geothermal gradients in the subsurface Thomson Orogen and the nature of the crustal basement beneath it, whether oceanic or continental, remain enigmatic. Previous studies have demonstrated that a higher crustal radiogenic input is required to explain these anomalous thermal gradients. In this study, we have investigated the...
Presentation
Widespread vein-type carbonate (e.g., travertine) occurrences developed along active fault systems during the late Quaternary period in Turkey, a region of known active tectonism. This study presents preliminary high precision U-series and geochemical data on hypogenic fluids migrated and precipitated as carbonate veins along fractures developed in...
Conference Paper
Full-text available
Tektonik olarak aktif olan bölgelerde CO 2 'çe zengin akışkanlar fay zonları boyunca yüze-ye ulaşarak traverten çökeltirler. Ayrıca bu çökeller içerisinde damar şeklinde (dayk veya sil benzeri) gelişen karbonat enjeksiyonları ve bunlara eşlik eden breş çökellerine de rastlanır. Bu çalışmada Eskipazar-Karabük bölgesindeki Akkaya sırt tipi ve damar t...
Presentation
Full-text available
Determination of the earthquake cyclicity along the active fault zones is of great importance to be able to understand the historical evolution of the tectonic regime. Calcite deposition along active fault systems occurs commonly as fracture filling by hypogenic fluids after sudden seismicity-induced CO 2 degassing. It is known that the long axes o...
Presentation
Microscope (microfabrics) and geochemical (stable isotope, trace element, Sr isotope) data derived from the stalagmite BUI collected from Bucak (Burdur Province, SW Turkey) provide detailed insight into paleoclimatic conditions during MIS 5d-b for the first time. MC-ICP-MS U-series dating of the speleothem revealed a two-step growth pattern that sp...
Conference Paper
Full-text available
In the volcanic regions, deformation is caused by shear failure, tensile failure or fluid pressurization processes that produce the ruptures at the tip of magma body. During crustal strain cycles related with volcanism, CO 2-bearing spring waters under high pressure in subsurface reservoirs are mobilized, so that carbonates are precipitated in the...
Article
Central Anatolia represents one of the most outstanding examples of intraplate deformation related to both continental collision and back-arc extension generating non-uniformly distributed stress fields. In this study, we provide direct field evidence of various stress directions and investigate carbonate-filled fracture systems in the Central Anatoli...
Article
We report two ⁴⁰Ar/³⁹Ar illite ages from fault gouge directly above the current trace of the Alpine Fault in New Zealand at Gaunt Creek (1.36 ± 0.27 Ma) and Harold Creek (1.18 ± 0.47 Ma), and one ⁴⁰Ar/³⁹Ar illite age from fault gouge from the Two Thumbs Fault on the east side of the Southern Alps. Metamorphic muscovite clasts inherited into the Alp...
Conference Paper
Full-text available
The Çöpler porphyry-epithermal gold deposit, is associated with middle Eocene dioritic and granodioritic intrusive rocks. It is a porphyry Cu-Au system characterized by a potassically altered (biotite-K-feldspar-magnetite) core overprinted by extensive phyllic (quartz-sericite) and argillic (quartz – montmorillonite – kaolinite - cristobalite) alte...
Article
Full-text available
Cappadocia Geothermal Province (CGP), central Turkey, consists of nine individual geothermal regions controlled by active regional fault systems. This paper examines the age dating of alteration minerals and the geochemistry (trace elements and isotopes) of the alteration minerals and geothermal waters, to assess the evolution of CGP in relation to...
Article
The seismic, drilling and logging data reveal that a large-scale igneous intrusion with a width of 14 Km and a maximum thickness of 170 m intruded within the Paleogene Liushagang Formation in the Fushan Depression, Beibuwan Basin, South China Sea (SCS). In this study, we report the geochemistry and Sr-Nd-Pb-Hf isotopic compositions of the igneous r...
Conference Paper
Full-text available
Travertenler U-Th serisi yöntemi ile yaşlandırılabilmeleri, kalsitin yapısındaki Ca’un yerini Sr aldığı için 87Sr/86Sr analizlerine olanak tanımaları ve ayrıca δ13C-δ18O izotop oranları ve nadir toprak element analizlerine uygun olmaları nedeniyle, tektonik ve paleoklimatolojik amaçlı çalışmalarda yaygın olarak kullanılmaktadır. Bu çalışmada, olduk...
Article
The formation process of authigenic clay minerals is a scientific issue that has received widespread attention, and a better understanding of this process is of great significance for thermal history analysis of basins. In this study, we conducted a systematic study of mineralogy, Rb-Sr isotopie dating and ⁴⁰Ar-³⁹Ar dating on the different size fra...
Article
The interior of the Australian continent shows evidence for late Quaternary to Recent fault-controlled mantle ³He and CO2 degassing. A series of interconnected NW-striking sinistral faults, the Norwest fault zone (NFZ), in south-central Australia are associated with travertine mounds, the latter show a regular spacing of 50–70 km. U-series ages on...
Article
Vein and breccia carbonates precipitated in a highly fractured/faulted carbonate bedrock in SW Turkey were investigated through high-resolution U-series geochronology, microstructural and geochemical studies including C-O-Sr isotope and rare-earth element and yttrium (REY) analyses. Petrographical observations and geochronological data are interpre...
Article
Multiple climate-sensitive trace element/Ca and stable isotope (O and C) profiles derived from Dim Cave speleothems (S-SW Turkey) provide evidence of climatic changes and define a series of palaeohydrological conditions for the period ~10-90 kyr. Dim Cave speleothem Mg/Ca, Sr/Ca, U/Ca, Ba/Ca, and Y/Ca ratios demonstrate similar patterns over glacia...
Conference Paper
Full-text available
Dating of late Quaternary volcanism is crucial to understanding of the recent mechanism of crustal deformation and future volcanic explosivity risk of the region. However, radiometric dating of volcanic products has been a major challenge because of high methodological error rate. In most cases, there are difficulties on discrimination of the volca...
Article
Full-text available
Speleothem-based stable isotope records are valuable in sub-humid and semi-arid settings where many other terrestrial climate proxies are fragmentary. The Eastern Mediterranean is one such region. Here we present an 80-kyr-long precisely-dated (by U-series) and high-resolution oxygen (δ18O) and carbon (δ13C) records from Dim Cave (~36°N) in SW Turk...
Article
Full-text available
This paper presents two new high-resolution geochronological determinations for the epithermal deposits in the World-class Guanajuato mining district, in central Mexico. These are a Rb-Sr isochron age in illite at 28.47 ± 0.55 Ma for the Villalpando and San Juan de Dios low sulfidation veins of the Sierra group of veins, and a 40Ar/39Ar plateau age...
Article
We present a new approach to identifying the source and age of paleofluids associated with low-temperature deformation in the brittle crust, using hydrogen isotopic compositions (δD) and 40Ar/39Ar geochronology of authigenic illite in clay gouge-bearing fault zones. The procedure involves grain size separation, polytype modeling, and isotopic analy...
Article
Full-text available
The formation of the northern part of the New England oroclines has previously been linked to dextral strike-slip faulting, but hitherto no concrete evidence has been shown to support this suggestion. We studied an exposure of a fault zone in the Red Rock headland, northeastern New South Wales, and we present here structural observations from the f...
Article
This paper reports geophysical anomalies and intra-crystalline quartz lamellae in drill cores from the Warburton West Basin overlapping the border of South Australia and the Northern Territory. The pre-Upper Carboniferous ~ 450x300 km-large Warburton Basin, north-eastern South Australia, is marked by distinct eastern and western magnetic, gravity a...
Article
The Warburton–Cooper–Eromanga basins of central–eastern Australia contain a number of reactivated fracture–fault networks that relate to a complex and poorly understood thermal and tectonic evolution. Authigenic illite was sampled from two prominent features of the Warburton–Cooper basins: the Gidgealpa–Merrimelia–Innamicka Ridge, composed of antic...