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GPS Results from the Woodlark Rift, Papua New Guinea, Geochem
PUBLICATIONS Geochemistry, Geophysics, Geosystems RESEARCH ARTICLE Continental breakup and UHP rock exhumation in action: GPS 10.1002/2014GC005458 results from the Woodlark Rift, Papua New Guinea Special Section: Laura M. Wallace1, Susan Ellis2, Tim Little3, Paul Tregoning4, Neville Palmer2, Robert Rosa5, Lithospheric Evolution of Richard Stanaway6, John Oa7, Edwin Nidkombu7, and John Kwazi7 Cenozoic UHP Terranes: From Convergence to Extension 1Institute for Geophysics, University of Texas, Austin, Texas, USA, 2GNS Science, Lower Hutt, New Zealand, 3School of Geography, Environment, and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand, 4Research 5 Key Points: School for the Earth Sciences, Australian National University, Canberra, ACT, Australia, Surveying Department, University 6 7 GPS reveals crustal deformation and of Technology, Lae, Papua New Guinea, Quickclose Pty. Ltd., Carlton, Victoria, Australia, PNG National Mapping Bureau, microplate kinematics in the Port Moresby, Papua New Guinea Woodlark Basin, SE Papua New Guinea Exhumation of UHP rocks in We show results from a network of campaign Global Positioning System (GPS) sites in the Wood- southeastern PNG is associated with Abstract active crustal extension lark Rift, southeastern Papua New Guinea, in a transition from seafloor spreading to continental rifting. GPS Our results demonstrate that low- velocities indicate anticlockwise rotation (at 2–2.7/Myr, relative to Australia) of crustal blocks north of the rift, angle normal faults can slip at rates producing 10–15 mm/yr of extension in the continental rift, increasing to 20–40 mm/yr of seafloor spreading of several mm/yr or more at the Woodlark Spreading Center. Extension in the continental rift is distributed among multiple structures. -
The Central Asia Collision Zone: Numerical Modelling of the Lithospheric Structure and the Present-Day Kinematics
Th e Central Asia collision zone: numerical modelling of the lithospheric structure and the present - day kinematics Lavinia Tunini A questa tesi doctoral està subjecta a l a llicència Reconeixement - NoComercial – SenseObraDerivada 3.0. Espanya de Creative Commons . Esta tesis doctoral está sujeta a la licencia Reconocimiento - NoComercial – SinObraDerivada 3.0. España de Creative Commons . Th is doctoral thesis is license d under the Creative Commons Attribution - NonCommercial - NoDerivs 3.0. Spain License . The Central Asia collision zone: numerical modelling of the lithospheric structure and the present-day kinematics Ph.D. thesis presented at the Faculty of Geology of the University of Barcelona to obtain the Degree of Doctor in Earth Sciences Ph.D. student: Lavinia Tunini 1 Supervisors: Tutor: Dra. Ivone Jiménez-Munt 1 Prof. Dr. Juan José Ledo Fernández 2 Prof. Dr. Manel Fernàndez Ortiga 1 1 Institute of Earth Sciences Jaume Almera 2 Department of Geodynamics and Geophysics of the University of Barcelona This thesis has been prepared at the Institute of Earth Sciences Jaume Almera Consejo Superior de Investigaciones Científicas (CSIC) March 2015 Alla mia famiglia La natura non ha fretta, eppure tutto si realizza. – Lao Tzu Agradecimientos En mano tenéis un trabajo de casi 4 años, 173 páginas que no hubieran podido salir a luz sin el apoyo de quienes me han ayudado durante este camino, permitiendo acabar la Tesis antes que la Tesis acabase conmigo. En primer lugar quiero agradecer mis directores de tesis, Ivone Jiménez-Munt y Manel Fernàndez. Gracias por haberme dado la oportunidad de entrar en el proyecto ATIZA, de aprender de la modelización numérica, de participar a múltiples congresos y presentaciones, y, mientras, compartir unas cervezas. -
Variable Holocene Deformation Above a Shallow Subduction Zone Extremely Close to the Trench
ARTICLE Received 24 Nov 2014 | Accepted 22 May 2015 | Published 30 Jun 2015 DOI: 10.1038/ncomms8607 OPEN Variable Holocene deformation above a shallow subduction zone extremely close to the trench Kaustubh Thirumalai1,2, Frederick W. Taylor1, Chuan-Chou Shen3, Luc L. Lavier1,2, Cliff Frohlich1, Laura M. Wallace1, Chung-Che Wu3, Hailong Sun3,4 & Alison K. Papabatu5 Histories of vertical crustal motions at convergent margins offer fundamental insights into the relationship between interplate slip and permanent deformation. Moreover, past abrupt motions are proxies for potential tsunamigenic earthquakes and benefit hazard assessment. Well-dated records are required to understand the relationship between past earthquakes and Holocene vertical deformation. Here we measure elevations and 230Th ages of in situ corals raised above the sea level in the western Solomon Islands to build an uplift event history overlying the seismogenic zone, extremely close to the trench (4–40 km). We find marked spatiotemporal heterogeneity in uplift from mid-Holocene to present: some areas accrue more permanent uplift than others. Thus, uplift imposed during the 1 April 2007 Mw 8.1 event may be retained in some locations but removed in others before the next megathrust rupture. This variability suggests significant changes in strain accumulation and the interplate thrust process from one event to the next. 1 Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, J. J. Pickle Research Campus, Building 196, 10100 Burnet Road (R2200), Austin, Texas 78758, USA. 2 Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, 1 University Station C9000, Austin, Texas 78712, USA. -
Cathaysia, Gondwanaland, and the Paleotethys in the Evolution of Continental Southeast Asia
GEOSEA V Proceedings Vol. !!, Ceo!. Soc. Malaysia, Bullelin20, August 1986; pp. 179-199 Cathaysia, Gondwanaland, and the Paleotethys in the evolution of continental Southeast Asia YURI G. GATINSKY1 AND CHARLES S. HUTCHISO 2 1All-Union Institute of Geology of Foreign Countries, Dimitrova, 7 Moscow, 109180, U.S.S.R. 2Department of Geology, University of Malaya, 59100 Kuala Lumpur, Malaysia . Abstract: Continental Southeast A ia is dominated by Precambrian continenral blocks overlain by Late Proterozoic to Paleozoic platform successions, representing Atlantic-type rifted miogeocl inal margins. All the blocks appear to have rifted and drifted from the Australian part of Gondwanaland. The timing and extent of their eparati on is analysed by the distribution of Penni an Cathaysian Gigamop leris and Gondwana Glossop1eris floras, assisted by dated tectono-structural units, paleoclimate indicators, and good quality paleomagnetic data. Between the blocks lie narrow intensely folded Phanerozoic mobile belts, which developed on the oceanic crust of the Paleotethys ocean, characterized by pelagic-turbidite flysch equences which shallowed as the oceans narrowed. The narrowing was effected by subduction resulting in island arcs within the oceans, and cordilleran volcano-plutonic arcs along the block margin . Extinction of the bas ins resulted in collision zones containing S-type granites and utu re zones containing dismembered ophi olites. Post-consolidation pl ate readju tments resulted in wrench and rift fa ulting in several places while convergence conti nued elsewhere. The tectonic analysis has been carried out by recognizing tectonic elements (structural-formati onal unit ~) for selected Phanerozoic time frame . We also pre ent a Phanerozoic sequence of palinspatic reconstructiors for the ri fti ng and drifting of the blocks from northern Australia. -
Late Miocene Coesite-Eclogite Exhumed in the Woodlark Rift Suzanne L
Late Miocene coesite-eclogite exhumed in the Woodlark Rift Suzanne L. Baldwin, Laura E. Webb, Brian D. Monteleone* Syracuse University, Department of Earth Sciences, Syracuse, New York 13244, USA ABSTRACT U-Pb ion probe analyses of zircon inclusions Late Miocene–Pliocene eclogites were exhumed in the Woodlark Rift of eastern Papua New in garnet from the sample studied (89321) Guinea, an actively extending region west of the Woodlark Basin seafl oor spreading center. yielded a 238U/206Pb age of 7.9 ± 1.9 Ma (2σ), We report the discovery of coesite in late Miocene eclogite from the lower plate of one of the and, together with in situ ion probe trace ele- D’Entrecasteaux Islands metamorphic core complexes within the Woodlark Rift. Zircon crys- ment and REE chemistry on zircon and garnet tallization temperatures (650–675 °C) and 238U/206Pb age (ca. 8 Ma), and rutile thermometry pairs, indicate zircon growth under eclogite (695–743 °C) combined with garnet-pyroxene thermometry (600–760 °C) and garnet-pyroxene- facies conditions (Monteleone et al., 2007). phengite barometry (18–27 kbar), indicate that the coesite-eclogite was exhumed from mantle The eclogite investigated preserves a peak depths (≥90 km) to the Earth’s surface at plate tectonic rates (cm yr–1). This late Miocene coesite- assemblage of garnet + omphacite + rutile + eclogite is the youngest exhumed ultrahigh-pressure (UHP) rock on Earth, and its preservation phengite + SiO2. Within the matrix, rutile is ahead of the westward-propagating seafl oor spreading center forces reevaluation of models for rimmed by retrograde titanite and is intergrown UHP exhumation, as well as the geologic and tectonic evolution of the Woodlark Rift. -
Can Microplate Rotation Drive Subduction Inversion?
Can microplate rotation drive subduction inversion? L.E. Webb1*, S.L. Baldwin1, T.A. Little2, P.G. Fitzgerald1 1Syracuse University, Earth Sciences, Syracuse, New York 13244, USA 2Victoria University of Wellington, Earth Sciences, P.O. Box 600, Wellington 6140, New Zealand ABSTRACT ary (Davies, 1980a,b; Davies and Warren, 1988; Worthing, 1988; Hill and We propose a model for the exhumation of Late Miocene coesite- Baldwin, 1993; Little et al., 2007; Appleby, 1996; Peters, 2007). Footwall eclogite in the Woodlark Rift of Papua New Guinea. Reorganization blueschist, eclogite, migmatite, gneiss, and Pliocene granodiorite are jux- within the obliquely convergent Australian–Pacifi c plate boundary taposed against an upper plate consisting of the Papuan Ultramafi c Belt, zone led to formation of the Woodlark microplate. Counterclockwise unmetamorphosed sediments, and volcanic rocks (Davies and Warren , rotation of the microplate relative to the Australian plate resulted in 1988; Hill et al., 1992; Hill, 1994, Little et al., 2007). Exhumation of extensional reactivation of a subduction thrust (subduction inver- HP-UHP rocks was facilitated by top-to-the-N (or NE), kilometer-scale sion) and the exhumation of high- and ultrahigh-pressure (HP-UHP) ductile shear zones and normal faults on the northern fl anks of the anti- rocks within the Australian–Woodlark plate boundary zone. The formal domes (Davies and Warren, 1988; Hill, 1994; Little et al., 2007). model invokes plate tectonic processes to drive rapid exhumation Stretching lineations in mylonites on Normanby Island and in gneisses and predicts spatial and temporal patterns of exhumation to assess its on the eastern part of Fergusson Island trend N or NNE, roughly paral- applica bility to HP-UHP terranes worldwide. -
July 31, 1977. SIO Reference 77-31
University of California, San Diego Marine Physical Laboratory of The Scripps Institution Of Oceanography La Jolla, California 92093 Cruise Report, INDOPAC Expedition, Legs 9 through 16 January 12–July 31, 1977 SIO REFERENCE 77-31 Edited by Delpha D. McGowan, George G. Shor, Jr. and Stuart M. Smith Reproduction in whole or in part is permitted for any purpose of the U.S. Government F. N. Spiess, Director Marine Physical Laboratory 23 November 1977 ― 1 ― ABSTRACT In the first half of 1977, the R/V Thomas Washington of the Scripps Institution of Oceanography continued work on INDOPAC Expedition, starting from Guam, Marianas, and ending in San Diego. Geophysical and geological programs were carried out in the marginal seas of southeast Asia; biological and physical oceanographic programs were carried out near Guam, and in the central and eastern Pacific. This report includes a brief summary of the work on each cruise leg, a chronology, cruise tracks, and lists of stations, samples, and observations. Work on leg 13 was in cooperation with the K/M Samudera of the Indonesian Institute of Sciences. INTRODUCTION INDOPAC Expedition started in March, 1976, when the R/V Thomas Washington left San Diego and headed across the Pacific carrying out programs in physical oceanography that terminated at Guam in June, 1976. Programs in marine geology and geophysics, mostly part of the SEATAR cooperative program of study of the tectonics and resources of southeast Asia offshore areas, were carried out from June to September, 1976 concluding at Guam. The ship went into lay-up status in Guam, in October, pending resumption of the work. -
Koulali Etal 2015 Gp
Geophysical Journal International Geophys. J. Int. (2015) 202, 993–1004 doi: 10.1093/gji/ggv200 GJI Geodynamics and tectonics New Insights into the present-day kinematics of the central and western Papua New Guinea from GPS A. Koulali,1 P. Tr e g o n i n g , 1 S. McClusky,1 R. Stanaway,2 L. Wallace3 and G. Lister1 1Research School of Earth Sciences, Australian National University, Canberra ACT 0200,Australia.E-mail:[email protected] 2School of Civil and Environmental Engineering, University of New South Wales, Australia 3Institute for Geophysics, University of Texas at Austin, Austin, TX, USA Accepted 2015 May 12. Received 2015 March 4; in original form 2014 August 7 Downloaded from SUMMARY New Guinea is a region characterized by rapid oblique convergence between the Pacific and Australian tectonic plates. The detailed tectonics of the region, including the partitioning of relative block motions and fault slip rates within this complex boundary plate boundary zone are still not well understood. In this study, we quantify the distribution of the deformation http://gji.oxfordjournals.org/ throughout the central and western parts of Papua New Guinea (PNG) using 20 yr of GPS data (1993–2014). We use an elastic block model to invert the regional GPS velocities as well as earthquake slip vectors for the location and rotation rates of microplate Euler poles as well as fault slip parameters in the region. Convergence between the Pacific and the Australian plates is accommodated in northwestern PNG largely by the New Guinea Trench 1 with rates exceeding 90 mm yr− ,indicatingthatthisisthemajoractiveinterplateboundary. -
Detailed Geometry of the Subducting Indian Plate Beneath the Burma Plate and Subcrustal Seismicity in the Burma Plate Derived from Joint Hypocenter Relocation
Earth Planets Space, 64, 333–343, 2012 Detailed geometry of the subducting Indian Plate beneath the Burma Plate and subcrustal seismicity in the Burma Plate derived from joint hypocenter relocation Nobuo Hurukawa1,PaPaTun2, and Bunichiro Shibazaki1 1International Institute of Seismology and Earthquake Engineering (IISEE), Building Research Institute, Tsukuba, Ibaraki 305-0802, Japan 2Department of Meteorology and Hydrology, Ministry of Transport, Nay Pyi Taw, Myanmar (Received May 20, 2011; Revised October 17, 2011; Accepted October 31, 2011; Online published May 25, 2012) With the aim of delineating the subducting Indian Plate beneath the Burma Plate, we have relocated earthquakes by employing teleseismic P-wave arrival times. We were able to obtain the detailed geometry of the subducting Indian Plate by constructing iso-depth contours for the subduction earthquakes at depths of 30–140 km. The strikes of the contours are oriented approximately N-S, and show an “S” shape in map view. The strike of the slab is N20◦Eat25◦N, but moving southward, the strike rotates counterclockwise to N20◦Wat20◦N, followed by a clockwise rotation to a strike of N10◦E at 17.5◦N, where slab earthquakes no longer occur. The plate boundary north of 20◦N might exist near, or west, of the coast line of Myanmar. The mechanisms of subduction earthquakes are down-dip extension, and T axes are oriented parallel to the local dip of the slab. Subcrustal seismicity occurs at depths of 20–50 km in the Burma Plate. This activity starts near the 60-km-depth contour of the subduction earthquakes and becomes shallower toward the Sagaing Fault, indicating that this fault is located where the cut-off depth of the seismicity becomes shallower. -
The Tectonic Framework of the Sumatran Subduction Zone
ANRV374-EA37-15 ARI 23 March 2009 12:21 The Tectonic Framework of the Sumatran Subduction Zone Robert McCaffrey Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180; email: [email protected] Annu. Rev. Earth Planet. Sci. 2009. 37:345–66 Key Words by University of California - San Diego on 06/16/09. For personal use only. First published online as a Review in Advance on Sumatra, subduction, earthquake, hazards, geodesy December 4, 2008 The Annual Review of Earth and Planetary Sciences is Abstract Annu. Rev. Earth Planet. Sci. 2009.37:345-366. Downloaded from arjournals.annualreviews.org online at earth.annualreviews.org The great Aceh-Andaman earthquake of December 26, 2004 and its tragic This article’s doi: consequences brought the Sumatran region and its active tectonics into the 10.1146/annurev.earth.031208.100212 world’s focus. The plate tectonic setting of Sumatra has been as it is today Copyright c 2009 by Annual Reviews. for tens of millions of years, and catastrophic geologic events have likely All rights reserved been plentiful. The immaturity of our understanding of great earthquakes 0084-6597/09/0530-0345$20.00 and other types of geologic hazards contributed to the surprise regarding the location of the 2004 earthquake. The timing, however, is probably best understood simply in terms of the inevitability of the infrequent events that shape the course of geologic progress. Our best hope is to improve under- standing of the processes involved and decrease our vulnerability to them. 345 ANRV374-EA37-15 ARI 23 March 2009 12:21 INTRODUCTION The island of Sumatra (Figure 1) forms the western end of the Indonesian archipelago and until recently was perhaps best known to the world for its coffee, though perhaps not so much as Java, its neighbor to the east. -
The Earth's Lithosphere-Documentary
See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/310021377 The Earth's Lithosphere-Documentary Presentation · November 2011 CITATIONS READS 0 1,973 1 author: A. Balasubramanian University of Mysore 348 PUBLICATIONS 315 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Indian Social Sceince Congress-Trends in Earth Science Research View project Numerical Modelling for Prediction and Control of Saltwater Encroachment in the Coastal Aquifers of Tuticorin, Tamil Nadu View project All content following this page was uploaded by A. Balasubramanian on 13 November 2016. The user has requested enhancement of the downloaded file. THE EARTH’S LITHOSPHERE- Documentary By Prof. A. Balasubramanian University of Mysore 19-11-2011 Introduction Earth’s environmental segments include Atmosphere, Hydrosphere, lithosphere, and biosphere. Lithosphere is the basic solid sphere of the planet earth. It is the sphere of hard rock masses. The land we live in is on this lithosphere only. All other spheres are attached to this lithosphere due to earth’s gravity. Lithosphere is a massive and hard solid substratum holding the semisolid, liquid, biotic and gaseous molecules and masses surrounding it. All geomorphic processes happen on this sphere. It is the sphere where all natural resources are existing. It links the cyclic processes of atmosphere, hydrosphere, and biosphere. Lithosphere also acts as the basic route for all biogeochemical activities. For all geographic studies, a basic understanding of the lithosphere is needed. In this lesson, the following aspects are included: 1. The Earth’s Interior. 2. -
Correlation Between Tectonic Plate Junctions and Great Earthquakes
Correlation between Tectonic Plate Junctions and Great Earthquakes N. Purnachandra Rao 1 and R. Pradeep Kumar 2 1. National Geophysical Research Institute, Hyderabad 500 007, India 2. International Institute of Information Technology, Hyderabad 500 019, India Abstract On 26th December 2004 an unusually large earthquake of magnitude 9.1 occurred off the coast of northern Sumatra, along the zone of subduction between the India and the Burma plates. This earthquake also triggered a killer tsunami causing massive death and destruction. On 28 March 2005, about 3 months later, another Great earthquake of magnitude 8.7 occurred just about 250 km southeast of the 26 December 2004 event. Such close spatial proximity of two Great earthquakes occurring within a very short span of 3 months is unprecedented. It is, however, interesting to note that the epicentral locations of these two Great earthquakes are very close to the quadruple-junction comprising the India, Burma, Australia and Sunda plates, suggesting the possibility of multiple plate interaction for generation of Great earthquakes. In general, a correlation between Great earthquakes and plate junctions appears to be true on a global scale, as is clearly demonstrated by an examination of epicentral locations of the world’s 12 largest earthquakes since the year 1900 (Figure 1). The details of these Great earthquakes and their locations with respect to tectonic plates are listed in Table 1. It can be seen that each of these Great earthquakes in the magnitude range of 8.5 to 9.5, falls very close to multiple plate junctions, with the exception of events 3 and 7 on the Western Aleutian trench.