Petroleum basins and hydrocarbon potential of the andes of peru and bolivia, 2018 pages 339375 doi. Mantlederived fluids in the nankai trough kumano forearc basin. Ophiolitic basement to a forearc basin and implications for. This together with the large amount of forearc basins present in the asia region with hints of a working petroleum system e.
Pages in category forearc basins the following 7 pages are in this category, out of 7 total. New geochronologic and thermochronologic data from rocks near hatcher pass, southwest talkeetna mountains, alaska, record earliest paleocene erosional and structural exhumation on the flank of the active cook inlet forearc basin. Triassic turbidites in the west qinling mountains, nw china. Pdf structure and evolution of the magnitogorsk forearc. Dashed white lines indicate seismic slip 2 m contour intervalduring.
Abstracthydrocarbonbearing thrace basin occupies much of the european part of turkey. Modification of continental forearc basins by flat. We manually account for the transitional nature of the san joaquin basement from hot sierran granite on the east to cool franciscan oceanic rocks on the west. Aapg memoir 117 is the first international book dedicated to the petroleum geology and exploration potential of peru and bolivia. Nanaimo group strata are subdivided into 11 lithostratigraphic units, which are identified based on lithology, paleontology, texture and position relative to both the basal nonconformity and to each. Forearc basins are marine depositional basins on the trench side of arcs, and they vary in size and abundance with the evolutionary stage of an arc. New insights in assessing potential reservoirs and plays. Structure and deformation of the kermadec forearc in. Most onland remnants of the cretaceous forearc basin west of the san.
Active deformation across the sumatran forearc over the december 2004 mw9. The provenance of forearc sediment can be used to differentiate period. This paper proposes a new classification scheme for forearc basins from the viewpoints of material transfer between the two. We are most grateful to yue yahui, song peiping, and wang chao for their.
A foreland basin is a structural basin that develops adjacent and parallel to a mountain belt. Dec 30, 2011 forearc basins are large sediment repositories that develop in the upper plate of convergent margins and are a direct response to subduction. However, the relationship between syntectonic basin sedimentation and growth of a wedge remains poorly understood, including how deformation of the wedge modifies the basin stratigraphy and how syntectonic sedimentation influences deformation of the wedge. Location and extent of tertiary structures in cook inlet. The nias basin also known as the west sumatra or sibolga basin is a forearc basin located off the western coast of sumatra, indonesia, in the indian ocean. However, deformation of the upper plate is also thought to affect the size and distribution of earthquakes mc. Forearc basin basin classification arcrelated basins forearc and backarc basins dominated by sediment derived from arc immature clastics backarc basin may also have component derived from continent deepsea trench has sediments derived from arc and sediments scraped off subducting oceanic crust melange basin classification. Geologic mapping of the thrust belt depicts a duplex with three horses that incorporate eocene limestones and oligocene to early miocene clastics inboard of the subducting cocos ridge axis. Morphology and tectonics of the andaman forearc, northeastern. Based on the stratigraphy, structure and the regional context of this basin, we propose that it developed as a fore arc basin between the. Variation in forearc basin configuration and basinfilling. Due to tectonic stresses as one tectonic plate rides over another, forearc regions are sources for great thrust earthquakes.
The width and depth of the foreland basin is determined by the flexural rigidity of the underlying. However, the relationship between syntectonic basin sedimentation and growth of a wedge remains poorly understood, including 1 how deformation of the wedge modifies the basin stratigraphy and 2 how syntectonic. Evolution of a forearc basin in arccontinent collision, offshore taiwan author. Evidence for crustal removal, tectonic erosion and flareups. To the south of this lineament, the talara and other basins rest on autochthonous, continentaltype basement shepherd and moberly 1981. The freeair gravity anomalies faa were determined from the 1. These settings are generally parallel to the plate boundary, and basin development within them is partially controlled by subduction processes.
Adobe acrobat reader dc software is the free global standard for reliably viewing, printing, and commenting on pdf documents. Structure and deformation of the kermadec forearc in response. Convergentmargin basins cmbs are commonly associated with active arcs, and hence are rich in detrital zircon dz whose ages closely. A perched basin, observed in both the mcs and swath bathymetry data, lies between 10 and 20 km west of the forearc high. Seismic stratigraphy of cenozoic deposits in the salaverry forearc basin, peru. Forearc basins are one of the fundamental sedimentary basins, and they preserve. Pdf forearc basin correlations from around the texas. Nov 28, 2016 joaquin basin and considering the forearc nature of the basin as well as the strong concentration of u, k, and th in the sierran granites, we focused on and refined the norift models. And now, its connected to the adobe document cloud. Experimental sedimentation occurs step by step in the forearc basin during shortening of the sand wedge.
Pdf sedimentation in the sunda trench and forearc region. Forearc and backarc basin free download as word doc. The provenance of forearc sediment can be used to differentiate periods of crustal growth, accretion, and destruction, enhanced magmatism, advancing and retreating subduction slabs, delamination, etc. Foreland basins form because the immense mass created by crustal thickening associated with the evolution of a mountain belt causes the lithosphere to bend, by a process known as lithospheric flexure.
In this study, the mechanics of forearc basins will be the object of a numerical investigation to understand the relationships between wedge deformation and forearc basin formation. Structural evolution of backthrusting in the mentawai. Dec 18, 2019 forearc basin stratigraphy is expected to record a detailed history of the deformation and growth pattern of an accretionary wedge. Triassic turbidites in the west qinling mountains, nw. Tectonic and depositional history of an active forearc basin. Stratigraphy and evolution of the cretaceous forearc celicalancones basin of southwestern ecuador. Forearc basin stratigraphy is expected to record a detailed history of the deformation and growth pattern of an accretionary wedge. Download free adobe acrobat reader dc software for your windows, mac os and android devices to view, print, and comment on pdf documents.
Effect of the northwardmigrating mendocino triple junction. Trenchslope basin trench forearc basin intraarc basin backarc basin trenches. The celica forearc basin of southwestern ecuador kennerley, 1973 represents one of the few examples of cretaceous turbidite. Initiation and evolution of forearc basins in the central myanmar. Oblique subduction of the gagua ridge beneath the ryukyu. Highresolution 20250 hz multichannel seismic mcs reflection data with record lengths of 48 s twt, totaling approximately 4620 line km on the shelf and slope of the sandino forearc basin of offshore western nicaragua, were acquired in novemberdecember 2004 cruise ew0412 and subsequently processed at the university of texas institute for geophysics. This thesis is brought to you for free and open access by the masters theses and graduate research at sjsu scholarworks. Experimental modelling of forearc basin development during accretionary wedge growth.
Earth as an evolving planetary system third edition, 2016. There is a main normal fault correlated along the sumatra region. The free air gravity anomalies faa were determined from the 1. Pdf evolution of the late cretaceous forearc basin. Based on the stratigraphy, structure and the regional context of this basin, we propose that it developed as a fore arc basin between the medial eocene and the oligocene, above the northward subducting intrapontide ocean. A remnant forearc basin is imaged by integrated seismic data in the northeast south china sea. Forearc basin closure and arc accretion in the submarine suture zone south of taiwan. Forearc basin the basement to the forearc basin was cored at sites 792 and 793 and consists of andesite and basaltic andesite r. Gas hydrate and free gas accumulations in the kumano forearc. Seismic constraints on a remnant mesozoic forearc basin in the. Pdf forearc basins are one of the fundamental sedimentary basins, and they. Evidence from apatite fissiontrack analysis for regional cretaceous cooling in the ouachita mountain fold belt and arkoma basin of arkansas. A forearc is the region between an oceanic trench and the associated volcanic arc.
To the north, the forearc is underlain by oceanic plateau material reynaud et al. Pdf formation of forearc basins and their influence on subduction. Geological society of america, cordilleran section annual meeting, may 11, 2015. Jul 25, 2017 download pdf understanding the japan arc and its lateral prolongation from the backarc to the subduction system select article evolution of the sea of japan backarc and some unsolved issues.
The name is derived from the island that bounds its western edge, the island of nias. Projection of leg 126 forearc basin sites into a single synthetic crosssection fah frontal arc high, fb forearc basin, and oah outer arc high. May 30, 2019 the lower nanaimo group was deposited in the forearc georgia basin, canada and records the basins initiation and early depositional evolution. Evolution of the ecuador offshore nonaccretionarytype forearc basin and. Jun 24, 2011 the upper cook inlet region has both the highest degree of shortening and the deepest part of the neogene basin. Hydrocarbon potential of forearc basins in asia, by. Though the basin evolution has been previously studied, e. All the basement can be easily realized based on strong multiple reflections from the seafloor except some places in the north part because of the existing of some down faulted continental blocks. The moho lies at 18 km beneath the basin centre, and at 35 km at the southern margin. The sunda forearc basin is a series of smaller individual basins separated from each other by transverse highs, isolating the respective sedimentary.
Forearc basins 811, show that their sediment fill recorded the tectonic history of both the volcanic arc massif and the. Bs geology 6a group members malik faraz muhammad adnan sami syed adil shah kawish hussain shoukat mohsin khan contents sedimentary basin types sedimentary basin in pakistan upper indus basin lower indus basin balochistan basin sedimentary basins a low area in the earths crust, of tectonic origin, in which sediments accumulate. These tectonic systems predict differing degrees of sedimentary reworking of the older forearc units. Forearc basin stratigraphy resulting from syntectonic. Pdf recent observations of an association between forearc basins and slip during subduction thrust. Evolution of a forearc basin in arccontinent collision. Pdf how does the nazca ridge subduction influence the. Forearc basin correlations from around the texas orocline, new england orogen, east australia.
Forearc basins formed as negative alpha basins remain mostly undeformed. Raukumara basin is uplifted along its eastern and southern margins but is only weakly deformed, suggesting uplift by. This chapter aims to elucidate variation of forearc basins in terms of basin configurations and basin filling depositional systems with some examinations of their controlling factors, using actual examples from the cenozoic forearc basins along the northeast and southwest japan arcs. Forearc regions are found at convergent margins, and include any accretionary wedge and forearc basin that may be present.
Outer forearc uplift and exhumation during highflux. Download free pdf structure and evolution of the magnitogorsk forearc basin. This paper proposes a new classification scheme for forearc basins from the viewpoints of material transfer between the two plates accretionary or nonaccretionary and the longterm strain field in the basin compressional or extensional by using characteristics of 41 modern forearc basins. The aim of this work is to gain an insight into the dynamics of the formation of the forearc basin, in particular the mechanism of formation of accommodation space and the preservation of basin stratigraphy. The geological evolution of the sedimentary basins of the subandean and forearc regions of peru and bolivia was, to a large extent, controlled by the development of the south american margin of western gondwana, setting up a favorable environment to the deposition. Download free usgs topographic map quadrangles in georeferenced pdf geopdf format by clicking on map locator on the usgs store web site. The results of this study provide important clues to further our understanding of dynamic interactions between forearc basins and subduction zone processes. Andamannicobar islands, wharton basin, indoaustralian plate.
Outer forearc uplift and exhumation during highflux magmatism. An increase or decrease of the sediment flux may change the type, geometry, and deformation manner of the forearc basin. The forearc basin initiated in albian time atop the continental west burma plate due to the. To the north of the profile, this bathymetric rise merges with the elevated forearc basin of. Site 792 is located near a basement high that did not become buried by turbidites until about 29. Paleogene vshaped basins and neogene subsidence of the. Forearc basins between the magmatic arc and the trench axis include a intramassif basins lying within and on basement terranes of the arc massif, b residual basins lying on oceanic or transitional crust trapped between the arc massif and the site of initial subduction, c accretionary basins lying on accreted elements of the growing. Co2 is liberated from wellcharacterized carbonate material and mixed with co2 free. Part of the collisional songpanganzi basin or an active forearc basin. Evolution of forearc and backarc sedimentary basins with. Many of the asian forearc basins are significantly underexplored, with the wells being limited to the shelfal areas. Evidence from detrital zircon geochemistry of the nacimiento forearc basin, california, usa. Map of sedimentary provinces reporting heavy oil 6. The diligent fault extends through the forearc basin south of 1140.
Sep 19, 2020 backarc spreading in the kalinago basin and block rotations went along with this tectonic phase, which ends up with tectonic uplifts and an earliestmiddle miocene regional emersion phase. Identifying upper crustal processes during arccontinent collision in the southern urals tectonics, 2001. Constraints on inner forearc deformation from balanced cross. Crustal erosion and accretion processes leading to forearc.
We also study the impact of hinterland and trench sedimentation on the wedge evolution and its impact on forearc basin formation. Dec 22, 2012 the forearc basin sediments deposited on the slope to basin in the southeast side and accretionary wedge to southwest. Resolving the architecture and early evolution of a forearc basin. Forearc basin is a sedimentary basin formed in the arctrench gap between a volcanic arc and plate subduction zone figure 1 1. You can search by location, theme, name, and other means to locate the area of interest. Early tertiary exhumation of the flank of a forearc basin. Bathymetry is in brown, free air gravity anomalies are in red and total intensity magnetic. Structural evolution of backthrusting in the mentawai fault. The forearc basin in myanmar is significant in understanding the. Average accretionary wedge has a width about 155163 km, and the forearc basin has about 100140 km thickness. Forearc basins, dotted black lines sugiyama, 1994, of the nankai subduction zone in southwest japan are associated with free gravity anomaly lows color. By integrating recent results from the basement study by mora et al.
The forearc structural high on profile d, which is bathymetrically uplifted relative to the trench slopes and forearc basin, terminates and remains absent from the bathymetry data beyond. Ophiolitic basement to a forearc basin and implications. Pdf forearc basin location originating from tectonic. Hydrocarbonbearing thrace basin occupies much of the european part of turkey. Dec 01, 2007 the fila costena thrust belt in the forearc of costa rica is accommodating a significant portion of the convergence of the cocos plate and panama microplate.
Forearc basins are important constituents of sediment traps along subduction zones. The nias basin, the island of nias which is a subaerial part of the accretionary complex, and the offshore, submarine accretionary complex, together. Forearc basin stratigraphy and interactions with accretionary. This forearc region has a longwavelength magnetic high, a large isostatic gravity low, high conductivity in the lower mantle, low pwave velocity v p, and a high pwave to shearwave velocity ratio v p v s. Landward vergence of thrust folds, primarily frontal fold vergence is the most. Forearc basins are important constituents of sediment traps along. In the mfz, ar1 is 6 km wide but is asymmetric, and exhibits complex small. Pdf active deformation across the sumatran forearc over. Cretaceous plutons shed sediments to the south, forming the paleocene arkose ridge formation. Although the linkage between basin formation and accretionary wedge growth suggests that mass balance exerts a key control on their evolution, the interaction processes between basin and. Formation of forearc basins and their influence on subduction zone.
A forearc origin for the thrace basin, nw turkey springerlink. The middle eocene to oligocene sequence in the centre of the basin exceeds 9 km in thickness. Trenchslope basins, perched on subduction wedges for definition, see below, are narrow elongate basins located on the. Forearc basins preserve the geologic record relating strictly to arc magmatism. To better define the accumulations of gas hydrates and free gases in the kumano forearc basin which is located above accretionary prism in the nankai margin off the kii peninsula, japan, we performed a highresolution seismic velocity analysis to 3d seismic data using the method of conventional semblance spectra via automatic velocity picking algorithm. These files were created using highresolution scans and average 1017 megabytes in size. These thrusts deformed the forearc basin sediments up to unit d. Forearc basins that form on top of the overriding plate remain passive to the deformation history of the wedge.
Evidence for crustal removal, tectonic erosion and flare. Seismicstratigraphic framework of the forearc basin off. This basin terminates to the west against a large 0. We present a compilation of 18 published models from the length of the great valley forearc basin, california, based on seismic reflection, borehole, seismic refraction, gravity, and aeromagnetic data to address long. Little if any heavy oil occurs in forearc basins, and natural bitumen does not. Pdf experimental modelling of forearc basin development. N, the fault divides the basin into a shallower western portion at depths of 12501500 m and a deeper eastern portion at 25003000 m fig. Forearc and backarc basin structural geology geology. The provenance of forearc sediment can be used to differentiate periods of crustal growth, accretion, and destruction, enhanced magmatism, advancing and retreating. In the associated forearc, the doloresguayaquil fault system fig.
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