Formation of forearc basins and their influence on subduction zone. This is indeed an excellent example of a sedimentrich convergent margin, but emphasis on california. A forearc is the region between an oceanic trench and the associated volcanic arc. Forearc peridotites from tonga record heterogeneous. Many of the worlds leading researchers in this field have been brought together in this. In this study, we investigate the chemical signatures and oxygen fugacity recorded by forearc peridotites from the tonga trench to assess the role of subductionzone melts and fluids in. Carolyn lampe rocky mountain and pacific section aapg. Pdf formation of forearc basins and their influence on subduction. Forearc basins are important constituents of sediment traps along subduction zones. Forearc basins are marine depositional basins on the trench side of arcs figure 3. The xigaze forearc basin in southern tibet is one of the best.
Forearc basin is a sedimentary basin formed in the arctrench gap between a volcanic arc and plate subduction zone figure 1 1. Exploration activity since 2004 has focussed on the onshore sector of the basin, and has included the first drilling campaign for over 30 years. Though the magnetic anomalies are more complex to decipher the rocks sampled from backarc basin spreading centers do not differ very much from those. Analysis of normal fault populations in the kumano forearc basin, nankai trough, japan. Multiple orientations and generations of faults from 3d coherency mapping g. Resolving the architecture and early evolution of a forearc basin georgia basin, canada using detrital zircon skip to main content thank you for visiting. Surya nugraha robert hall abstract cenozoic subduction of the indoaustralian plate beneath java began in the middle eocene. Pdf the stratigraphic succession of a forearc basin provides crucial information on the history of a convergent plate margin. In particular, it helps to establish the origin of the underlying ophiolites and to. The destructive nature of subduction erosion poses challenges to fully understanding the evolution of erosive convergent margins that are critical to understanding crustal recycling and. The palaeogene forearc basin of the eastern alps and. The forearc is the region between the subduction zone and the volcanic chain volcanic arc. The ones marked may be different from the article in the profile.
Structural settings of deep natural gas accumulations in. Stratigraphic signatures of forearc basin formation. Microbial communities from methane hydratebearing deep. Pdf controls on forearc basin formation and evolution. The forearc basin in myanmar is significant in understanding the development of continental forearc basins. Resolving the architecture and early evolution of a. Three samples from the kc and ks units from the talkeetna mountains. Abstract deep natural gas accumulations 15,000 ft, 4,572 m are associated with two. Interpretation of new multichannel seismic reflection data from the andaman forearc basin afb in the northern indian ocean is presented here.
Deposition and deformation of modern accretionarytype forearc. Modification of continental forearc basins by flat. Insights from oligoceneto recent tectonostratigraphy of the lower magdalena valley basin ofnorthwest colombia. Insights from analogue modeling jacques malavieille. The wrangell mountains basin is a mesozoic forearc basin that developed during a period of accretionary. If a 10% lherzolite component containing 10% spinel is assumed, the maximum depth in this model would increase by 30 m on the southern side of the forearc basin. The highquality multichannel seismic data from the. Consequences of continental subduction on forearc basin. Basins associated with subduction processes prepared by dr. Petroleum system of early cretaceous forearc basin.
Forearc regions are found at convergent margins, and include any accretionary wedge and forearc basin that may be present. Late cenozoic seismic stratigraphy of the andaman forearc. Recent advances focuses on key topics or areas where the greatest strides forward have been made, while also providing online access to the. To understand subduction initiation, study forearc crust. A foreland basin is a structural basin that develops adjacent and parallel to a mountain belt. The eel river forearc basin at the southern end of the cascadia subduction zone gulick et al. Pdf forearc basins are one of the fundamental sedimentary basins, and they preserve various geological phenomena arising from dynamic interactions. Analysis of normal fault populations in the kumano forearc. Eocene strata of chindwin and minbu subbasins in the central myanmar depression.
This study determined the clay mineral compositions of sediment from two submarine mud volcanoes in the kumano forearc basin. The kumano basin, located along the nankai margin, southwest japan fig. Frontiers partitioning pervasive detrital geochronologic. Forearc basin stratigraphy and interactions with accretionary. Forearc basin evolution along accretionary convergent.
Initiation and evolution of forearc basins in the central. Forearc regions are found at convergent margins, and include any accretionary wedge and forearc basin that may be. This study examined the thermal history of the kumano forearc basin, as well as slope basin sediments and the accretionary prism, in the nankai trough, offshore japan, using vitrinite. Condie, in earth as an evolving planetary system third edition, 2016. Multibeam mb and subbottom profile sbp data along the forearc slope off miyagi, japan, are combined to investigate structuralmorphological and sedimentary structures along the. The stratigraphic succession of a forearc basin provides crucial information on the history of a convergent plate margin. The underexplored sandino basin nicaragua basin trough is located within the forearc area of western nicaragua and nw costa rica. Processes and sedimentary features that characterize modified forearc basins include the following. Sediment flow routing during formation of forearc basins. The formation of the lower magdalena amagmatic, forearc basin occurred in a stable setting from the.
Foreland basins form because the immense mass created by crustal thickening associated with the evolution of. Types, geometries, and relationships to subduction zone dynamics article pdf available in geological society of america bulletin 12856. Variation in forearc basin configuration and basinfilling. In continental margin arcs, such as the sunda arc in indonesia, forearc basins range up to 700 km in strike length. Thermal fluid migration in the kumano forearc basin. This cited by count includes citations to the following articles in scholar. Preservation of forearc basins during island arccontinent. The birth of the xigaze forearc basin in southern tibet. As megasplay formation may also b e related to strength contrasts within the accretionary. Chief editor inside this issue cenozoic stratigraphy of the east java forearc a. Clay mineralogy is an important characteristic of mud volcano sediments. Structural settings of deep natural gas accumulations in the conterminous united states by william j. Microbial communities in cores obtained from methane hydratebearing deep marine sediments down to more than 300 m below the seafloor in the forearc basin of the nankai trough. Forearc basin evolution along accretionary convergent margins, wrangell mountains, alaska.
We present stratigraphic, sandstone petrographic, and upb detrital data from upper cretaceous. Investigating the complex interplay between tectonics and sedimentation is a key endeavor in modern earth science. Forearc basin strata were subdivided into individual or groups of formations that represent seven different time intervals. Pdf recent observations of an association between forearc basins and slip during subduction thrust earthquakes suggest a link between processes. Formation of forearc basins by collision between seamounts. Structuralmorphological and sedimentary features of. Tectonics of sedimentary basins wiley online books. Mantlederived fluids in the nankai trough kumano forearc. Seabeam data reveal two deep subcircular reentrants in the lower arc slope of the new hebrides island arc that may illustrate two stages in the development of a novel type of forearc basin. Pdf the birth of the xigaze forearc basin in southern tibet.