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Structural Heterogeneity in and Around the Fold-And-Thrust Belt of The
Iwasaki et al. Earth, Planets and Space (2019) 71:103 https://doi.org/10.1186/s40623-019-1081-z FRONTIER LETTER Open Access Structural heterogeneity in and around the fold-and-thrust belt of the Hidaka Collision zone, Hokkaido, Japan and its relationship to the aftershock activity of the 2018 Hokkaido Eastern Iburi Earthquake Takaya Iwasaki1* , Noriko Tsumura2, Tanio Ito3, Kazunori Arita4, Matsubara Makoto5, Hiroshi Sato1, Eiji Kurashimo1, Naoshi Hirata1, Susumu Abe6, Katsuya Noda7, Akira Fujiwara8, Shinsuke Kikuchi9 and Kazuko Suzuki10 Abstract The Hokkaido Eastern Iburi Earthquake (M 6.7) occurred on Sep. 6, 2018 in the southern part of Central Hokkaido, Japan. Since Paleogene, this region has experienced= the dextral oblique transpression between the Eurasia and North American (Okhotsk) Plates and the subsequent collision between the Northeast Japan Arc and the Kuril Arc due to the oblique subduction of the Pacifc Plate. This earthquake occurred beneath the foreland fold-and-thrust belt of the Hidaka Collision zone developed by the collision process, and is characterized by its deep focal depth (~ 37 km) and complicated rupture process. The reanalyses of controlled source seismic data collected in the 1998–2000 Hokkaido Transect Project revealed the detailed structure beneath the fold-and-thrust belt, and its relationship with the aftershock activity of this earthquake. Our refection processing using the CRS/MDRS stacking method imaged for the frst time the lower crust and uppermost mantle structures of the Northeast Japan Arc underthrust beneath a thick (~ 5–10 km) sedimentary package of the fold-and-thrust belt. Based on the analysis of the refraction/wide- angle refection data, the total thickness of this Northeast Japan Arc crust is only 16–22 km. -
Geological Excursion BASE-Line Earth
Geological Excursion BASE-LiNE Earth (Graz Paleozoic, Geopark Karavanke, Austria) 7.6. – 9.6. 2016 Route: 1. Day: Graz Paleozoic in the vicinity of Graz. Devonian Limestone with brachiopods. Bus transfer to Bad Eisenkappel. 2. Day: Visit of Geopark Center in Bad Eisenkappel. Walk on Hochobir (2.139 m) – Triassic carbonates. 3. Day: Bus transfer to Mezica (Slo) – visit of lead and zinc mine (Triassic carbonates). Transfer back to Graz. CONTENT Route: ................................................................................................................................... 1 Graz Paleozoic ...................................................................................................................... 2 Mesozoic of Northern Karavanke .......................................................................................... 6 Linking geology between the Geoparks Carnic and Karavanke Alps across the Periadriatic Line ....................................................................................................................................... 9 I: Introduction ..................................................................................................................... 9 II. Tectonic subdivision and correlation .............................................................................10 Geodynamic evolution ...................................................................................................16 Alpine history in eight steps ...........................................................................................17 -
Balkatach Hypothesis: a New Model for the Evolution of the Pacific, Tethyan, and Paleo-Asian Oceanic Domains
Research Paper GEOSPHERE Balkatach hypothesis: A new model for the evolution of the Pacific, Tethyan, and Paleo-Asian oceanic domains 1,2 2 GEOSPHERE, v. 13, no. 5 Andrew V. Zuza and An Yin 1Nevada Bureau of Mines and Geology, University of Nevada, Reno, Nevada 89557, USA 2Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California 90095-1567, USA doi:10.1130/GES01463.1 18 figures; 2 tables; 1 supplemental file ABSTRACT suturing. (5) The closure of the Paleo-Asian Ocean in the early Permian was accompanied by a widespread magmatic flare up, which may have been CORRESPONDENCE: avz5818@gmail .com; The Phanerozoic history of the Paleo-Asian, Tethyan, and Pacific oceanic related to the avalanche of the subducted oceanic slabs of the Paleo-Asian azuza@unr .edu domains is important for unraveling the tectonic evolution of the Eurasian Ocean across the 660 km phase boundary in the mantle. (6) The closure of the and Laurentian continents. The validity of existing models that account for Paleo-Tethys against the southern margin of Balkatach proceeded diachro- CITATION: Zuza, A.V., and Yin, A., 2017, Balkatach hypothesis: A new model for the evolution of the the development and closure of the Paleo-Asian and Tethyan Oceans criti- nously, from west to east, in the Triassic–Jurassic. Pacific, Tethyan, and Paleo-Asian oceanic domains: cally depends on the assumed initial configuration and relative positions of Geosphere, v. 13, no. 5, p. 1664–1712, doi:10.1130 the Precambrian cratons that separate the two oceanic domains, including /GES01463.1. the North China, Tarim, Karakum, Turan, and southern Baltica cratons. -
Repeated Occurrence of Surface-Sediment Remobilization
Ikehara et al. Earth, Planets and Space (2020) 72:114 https://doi.org/10.1186/s40623-020-01241-y FULL PAPER Open Access Repeated occurrence of surface-sediment remobilization along the landward slope of the Japan Trench by great earthquakes Ken Ikehara1* , Kazuko Usami1,2 and Toshiya Kanamatsu3 Abstract Deep-sea turbidites have been utilized to understand the history of past large earthquakes. Surface-sediment remo- bilization is considered to be a mechanism for the initiation of earthquake-induced turbidity currents, based on the studies on the event deposits formed by recent great earthquakes, such as the 2011 Tohoku-oki earthquake, although submarine slope failure has been considered to be a major contributor. However, it is still unclear that the surface-sed- iment remobilization has actually occurred in past great earthquakes. We examined a sediment core recovered from the mid-slope terrace (MST) along the Japan Trench to fnd evidence of past earthquake-induced surface-sediment remobilization. Coupled radiocarbon dates for turbidite and hemipelagic muds in the core show small age diferences (less than a few 100 years) and suggest that initiation of turbidity currents caused by the earthquake-induced surface- sediment remobilization has occurred repeatedly during the last 2300 years. On the other hand, two turbidites among the examined 11 turbidites show relatively large age diferences (~ 5000 years) that indicate the occurrence of large sea-foor disturbances such as submarine slope failures. The sedimentological (i.e., of diatomaceous nature and high sedimentation rates) and tectonic (i.e., continuous subsidence and isolated small basins) settings of the MST sedimentary basins provide favorable conditions for the repeated initiation of turbidity currents and for deposition and preservation of fne-grained turbidites. -
27. Sedimentary Facies Evolution of the Nankai Forearc and Its Implications for the Growth of the Shimanto Accretionary Prism1
Hill, I.A., Taira, A., Firth, J.V., et al., 1993 Proceedings of the Ocean Drilling Program, Scientific Results, Vol. 131 27. SEDIMENTARY FACIES EVOLUTION OF THE NANKAI FOREARC AND ITS IMPLICATIONS FOR THE GROWTH OF THE SHIMANTO ACCRETIONARY PRISM1 Asahiko Taira2 and Juichiro Ashi2 ABSTRACT A combination of Deep Sea Drilling Project-Ocean Drilling Program drilling results and site survey data in the Shikoku Basin, Nankai Trough, and Nankai landward slope region provides a unique opportunity to investigate the sedimentary facies evolution in the clastic-dominated accretionary forearc. Here, we consider the facies evolution model based on the drilling results, IZANAGI sidescan images, and seismic reflection profiles. The sedimentary facies model of the Nankai forearc proposed in this paper is composed of two parts: the ocean floor-trench- lower slope sedimentary facies evolution and the upper slope to forearc basin sedimentary facies evolution. The former begins with basal pelagic and hemipelagic mudstones overlain by a coarsening upward sequence of trench turbidites which are, in turn, covered by slope apron slumps and lower slope hemipelagic mudstone. This assemblage is progressively faulted and folded into a consolidated accretionary prism that is then fractured and faulted in the upper slope region. Massive failure of the seafloor in the upper slope region produces olistostrome deposits that contain lithified blocks derived from older accretionary prism dispersed in a mud matrix. The contact between the older accretionary prism and the upper slope olistostrome is a submarine unconformity that is the first stratigraphic evidence for the exhumation of an older prism to the seafloor. The olistostrome beds are then overlain by forearc basin-plain mudstone and turbidites which are progressively covered by coarsening-upward delta-shelf sequences. -
Paleozoic Evolution of Pre-Variscan Terranes: from Gondwana to the Variscan Collision
Geological Society of America Special Paper 364 2002 Paleozoic evolution of pre-Variscan terranes: From Gondwana to the Variscan collision Gérard M. Stamp×i Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland Jürgen F. von Raumer Institut de Minéralogie et Pétrographie, Université de Fribourg, CH-1700 Fribourg, Switzerland Gilles D. Borel Institut de Géologie et Paléontologie, Université de Lausanne, CH-1015 Lausanne, Switzerland ABSTRACT The well-known Variscan basement areas of Europe contain relic terranes with a pre-Variscan evolution testifying to their peri-Gondwanan origin (e.g., relics of Neo- proterozoic volcanic arcs, and subsequent stages of accretionary wedges, backarc rift- ing, and spreading). The evolution of these terranes was guided by the diachronous subduction of the proto-Tethys oceanic ridge under different segments of the Gond- wana margin. This subduction triggered the emplacement of magmatic bodies and the formation of backarc rifts, some of which became major oceanic realms (Rheic, paleo- Tethys). Consequently, the drifting of Avalonia was followed, after the Silurian and a short Ordovician orogenic event, by the drifting of Armorica and Alpine domains, ac- companied by the opening of the paleo-Tethys. The slab rollback of the Rheic ocean is viewed as the major mechanism for the drifting of the European Variscan terranes. This, in turn, generated a large slab pull force responsible for the opening of major rift zones within the passive Eurasian margin. Therefore, the µrst Middle Devonian Variscan orogenic event is viewed as the result of a collision between terranes detached from Gondwana (grouped as the Hun superterrane) and terranes detached from Eurasia. -
The Khopik Porphyry Copper Prospect, Lut Block, Eastern Iran: Geology, Alteration and Mineralization, fluid Inclusion, and Oxygen Isotope Studies
OREGEO-01217; No of Pages 23 Ore Geology Reviews xxx (2014) xxx–xxx Contents lists available at ScienceDirect Ore Geology Reviews journal homepage: www.elsevier.com/locate/oregeorev The Khopik porphyry copper prospect, Lut Block, Eastern Iran: Geology, alteration and mineralization, fluid inclusion, and oxygen isotope studies A. Malekzadeh Shafaroudi a,⁎,M.H.Karimpoura, C.R. Stern b a Research Center for Ore Deposits of Eastern Iran, Ferdowsi University of Mashhad, Iran b Department of Geological Sciences, University of Colorado, CB-399, Boulder, CO 80309-399, USA article info abstract Article history: The Khopik porphyry copper (Au, Mo) prospect in Eastern Iran is associated with a succession of Middle to Late Received 14 October 2012 Eocene I-type, high-K, calc-alkaline to shoshonite, monzonitic to dioritic subvolcanic porphyry stocks emplaced Received in revised form 16 April 2014 within cogenetic volcanic rocks. Laser-ablation U-Pb zircon ages indicate that the monzonite stocks crystallized Accepted 21 April 2014 over a short time span during the Middle Eocene (39.0 ± 0.8 Ma to 38.2 ± 0.8 Ma) as result of subduction of Available online xxxx the Afghan block beneath the Lut block. Keywords: Porphyry copper mineralization is hosted by the monzonitic intrusions and is associated with a hydrothermal alter- Porphyry copper ation that includes potassic, sericitic-potassic, quartz-sericite-carbonate-pyrite (QSCP), quartz-carbonate-pyrite Khopik (QCP), and propylitic zones. Mineralization occurs as disseminated to stockwork styles, and as minor hydrothermal Lut Block breccias. Some mineralization occurs in fault zones as quartz-sulfide veins telescoped onto the porphyry system. -
Abstracts & Field Guides
Berichte der Geologischen Bundesanstalt, 99 11th Workshop on Alpine Geological Studies & th 7 European Symposium on Fossil Algae Abstracts & Field Guides Schladming, Sept. 2013 Redaktion: Ralf Schuster Cover image: Sölk marble from the base of the Weiße Wand, Walchental (Styria, Austria) Impressum: ISSN 1017-8880 Alle Rechte für das In- und Ausland vorbehalten © Geologische Bundesanstalt (GBA) A-1030 Wien, Neulinggasse 38 www.geologie.ac.at Wien, September 2013 Medieninhaber, Herausgeber und Verleger: GBA, Wien Redaktion: Ralf Schuster (Geologische Bundesanstalt) Technische Redaktion; Christoph Janda (Geologische Bundesanstalt) Umschlag Monika Brüggemann-Ledolter Druck: Riegelnik, Offsetschnelldruck, Piaristengasse 19, A-1080 Wien Ziel der „Berichte der Geologischen Bundesanstalt“ ist die Verbreitung wissenschaftlicher Ergebnisse durch die Geologische Bundesanstalt. Die „Berichte der Geologischen Bundesanstalt“ sind im Handel nicht erhältlich. Berichte Geol. B.-A., 99 11th Workshop on Alpine Geological Studies & 7th IFAA Content Organisation & Time Schedule 4 Abstracts Emile Argand Conference (11th Workshop on Alpine Geological Studies) Editorial: Ralf Schuster 9 Abstracts 7th European Symposium on Fossil Algae Editorial: Sigrid Missoni & Hans-Jürgen Gawlick 107 Field guide: General Introduction in the Geology of the Easter Alps Ralf Schuster 121 Field guide Excursion A1: Southern Alps of Slovenia in a nutshell: paleogeography, tectonics, and active deformation Bogomir Celarc, Marko Vrabec, Boštjan Rožič, Polona Kralj, Petra Jamšek Rupnik, -
Memorie Della Accademia Delle Scienze Di Torino
Memorie della Accademia delle Scienze di Torino Classe di Scienze Fisiche, Matematiche e Naturali Serie V, Volume 41 ACCADEMIA DELLE S CIENZE DI T ORINO 2017 Edito con il contributo dell’Istituto di Geoscienze e Georisorse (IGG, unità di Torino) del Consiglio Nazionale delle Ricerche (CNR) 2017 ACCADEMIA DELLE S CIENZE DI T ORINO Via Accademia delle Scienze, 6 10123 Torino, Italia Uffi ci : Via Maria Vittoria, 3 10123 Torino, Italia Tel. +39-011-562.00.47; Fax +39-011-53.26.19 Tutte le memorie che appaiono nelle «Memorie dell’Accademia delle Scienze di Torino» sono disponibili in rete ad accesso aperto e sono valutate da referees anonimi attraverso un sistema di peer review . I lavori pubblicati sono classifi cati in base al seguente elenco di materie: Biologia animale e dell’uomo, Biologia vegetale, Chimica, Fisica, Geoscienze, Matematica, Scienza dell’informazione, Scienza dell’ingegneria, Scienze dell’ambiente, Scienze e ingegneria dei materiali, Storia delle scienze. L’Accademia vende direttamente le proprie pubblicazioni. Per acquistare fascicoli scrivere a: * [email protected] Per contattare la redazione rivolgersi a * [email protected] I lettori che desiderino informarsi sulle pubblicazioni e sull’insieme delle iniziative dell’Accademia delle Scienze di Torino possono consultare il sito www.accademiadellescienze.it ISSN: 1120-1630 ISBN: 978-88-99471-14-9 Acc. Sc. Torino Memorie Sc. Fis. 41 (2017), 3-143, 1 tab., 16 fi gg. GEOSCIENZE Geological Map of Piemonte Region at 1:250,000 scale Explanatory Notes Memoria di F!"#$%$& P$!'! *, L B*, R.& C!1'&'$** , A ’A.#$**,*, G F*, A I*, P M*, S T!++&'- *, G M.& * e M M*** presentata dal Socio corrispondente F!"#$%$& P$!'! nell’adunanza del 10 maggio 2017 e approvata nell’adunanza del 13 dicembre 2017 Abstract. -
(EEL2019) Field Excursion Guide Convergent Plate Boundary
EPS-ELSI Winter School “Evolution of Earth & Life” (EEL2019) Field Excursion Guide Convergent Plate Boundary & Geology of Island Arc in Tanzawa area, Japan Excursion Leader: Yuichiro Ueno Guidebook Editor: Tomohiko Sato, Shigenori Maruyama Dec. 2nd – Dec. 3rd, 2019 1 1. Introduction Japan is a unique place to study plate tectonics because the island located at the convergent plate boundary. In order to understand the collisional orogeny and crustal evolution, we plan to visit Tanzawa Mountain in the Izu-Hakone region, where we can observe how the Philippine Sea Plate subducted below the island arc in the field. Through the geology of the convergent plate boundary, we are able to consider how the continental crust evolve through the history of the Earth. 2. Geology of Japan Four plates meet around Japan island arc along the subduction zone The subduction of the Pacific Plate under the Philippine Sea Plate creates a Izu-Bonin-Mariana Arc, where many volcanic islands are distributed. The Philippine Sea Plate is now moving 3 ~ 5 cm/year to the north and is subducted under Eurasian and North American Plates, which create a main Japan island (Honshu Arc). The famous Mt. Fuji is located near the triple junction of the three plates, where the oceanic islands collided with the Honshu Arc at Izu-Hakone region (Red box in Fig.2). Also, the back arc basins (Japan Sea and Okinawa Trough) are spreading since about 20 million years ago. Fig. 1. Plate boundaries around Japan. Red box is Izu-Hakone area, very rare region on the Earth having triple junction where the boundaries of three tectonic plates meet. -
The Geology of Japan Moreno, S
Spine width 24.5mm Edited by Edited Edited by T. T. Moreno, S. Wallis, T. Kojima & W. Gibbons The Geology of Japan S. Moreno, Wallis, T. Wallis, Edited by T. Moreno, S. Wallis, T. Kojima & W. Gibbons Kojima It has been 25 years since publication of the most recent English language summary of the geology of Japan. This book offers an up-to- W. & date comprehensive guide for those interested both in the geology of Gibbons The Geology of Japan the Japanese islands and geological processes of island arcs in general. It contains contributions from over 70 different eminent researchers in their fields and is divided into 12 main chapters: Geological Evolution of Japan: an Overview ; • The • Regional Tectonostratigraphy (consisting of seven separate sections giving full coverage both to the different geographic regions and different geological ages); Geology of Japan • Ophiolites and Ultramafic Units ; • Granitic Rocks; • Miocene–Holocene Volcanism; • Neogene–Quaternary Sedimentary Successions; • Deep Seismic Structure; • Crustal Earthquakes; • Coastal Geology and Oceanography; • Mineral and Hydrocarbon Resources; • Engineering Geology; • Field Geotraverse, Geoparks and Geomuseums (with information on travelling by public transport to see some of the great geological sites of Japan). Each chapter includes the unique contribution of an extensive aid to the written forms of geology-related names in Japanese. Front cover: Red Fuji, also known as south wind, clear sky, from the 36 views of Mt Fuji by Hokusai (1760–1849). Image courtesy of S. Wallis. -
New View of the Stratigraphy of the Tetori Group in Central Japan
Memoir of the Fukui Prefectural Dinosaur Museum 14: 25–61 (2015) REVIEW © by the Fukui Prefectural Dinosaur Museum NEW VIEW OF THE STRATIGRAPHY OF THE TETORI GROUP IN CENTRAL JAPAN Shin-ichi SANO Fukui Prefectural Dinosaur Museum Terao, Muroko, Katsuyama, Fukui 911-8601, Japan ABSTRACT The stratigraphy of the Tetori Group (sensu lato) and other Early Cretaceous strata in the Hakusan Region in the Hida Belt, northern Central Japan, is reviewed based on recent advances in ammonoid biostratigraphy, U-Pb age determination of zircons using inductively coupled plasma-mass spectrometry with laser ablation sampling (LA-ICPMS), recognition of marine influence, and climatic change inferred from the occurrences of thermophilic plants and pedogenetic calcareous nodules. Four depositional stages (DS) are recognized: DS1 (Late Bathonian–Middle Oxfordian)̶mainly marine strata characterized by the occurrences of ammonoids; DS2 (Berriasian–Late Hauterivian)̶mainly brackish strata characterized by the occurrences of Myrene (Mesocorbicula) tetoriensis and Tetoria yokoyamai; DS3 (Barremian– Aptian)̶fluvial strata characterized by the occurrence of abundant quartzose gravels and freshwater molluscs, such as Trigonioides, Plicatounio and Nippononaia; DS4 (Albian–Cenomanian)̶volcanic/plutonic rocks which unconformably covered or intruded into the Tetori Group. I here propose new interpretation that 1) the Tetori Group (s.l.) in the Hakusan Region in the Hida Belt is divided into Middle–Late Jurassic Kuzuryu Group (corresponding to DS1) and unconformably overlying Early Cretaceous Tetori Group (sensu stricto) (corresponding to DS2–3); and 2) the Tetori Group (s.l.) in other areas is separated from the Tetori Group (s.s.), and divided into the Late Jurassic strata of the Kuzuryu Group (corresponding to the upper part of the same group in the Hakusan Region) and the Early Cretaceous Jinzu Group in the Jinzu Region in the Hida Belt, and the Late Jurassic–Early Cretaceous Managawa Group in the Hida Gaien Belt.