Eocene strata of chindwin and minbu subbasins in the central myanmar depression. In this paper we discuss the age, origin, and deformation of the late miocene unconformity and incorporate this information with the stratigraphy of the forearc basin, adjacent accretionary wedge, and abyssal plain to document the neo. Due to tectonic stresses as one tectonic plate rides over another, forearc. Clay mineral suites in submarine mud volcanoes in the. Exploration activity since 2004 has focussed on the onshore sector of the basin, and has included the first drilling campaign for over 30 years. A forearc is the region between an oceanic trench and the associated volcanic arc. Thermal basin modelling of the arauco forearc basin, south central chile heat flow and active margin tectonics. Deep within the andes mountains of northern peru, two rivers flow together. A foreland basin is a structural basin that develops adjacent and parallel to a mountain belt.
A fourdimensional petroleum systems model for the san joaquin basin province, california. Forearc basins are marine depositional basins on the trench side of arcs figure 3. This situation, albeit unusual, might explain both the modern japan and eocene oregon examples fig. Editor, the new concepts of continental margin sedi. Conventional iodp shipboard methods of gas investigations comprise gas sampling from core voids and headspace gas sampling followed by shipboard gas analysis. Basins associated with subduction processes prepared by dr. Mud volcanoes in deep water of andaman forearc basin. The andaman forearc basin is one such basin where occurrence of mud volcano is quite common. Lister1 1research school of earth sciences, australian national university, canberra, act 2601, australia 2se asia research group, department of earth sciences, royal holloway university of london, egham tw20 0ex, uk abstract. Plio quaternary segmentation of the south tyrrhenian forearc basin article pdf available in international journal of earth sciences 951. Their junction forms one of the greatest bodies of water in the world. Forearc basins that form on top of the overriding plate remain passive to the deformation history of the wedge. Forearc regions are found at convergent margins, and include any accretionary wedge and forearc basin that may be present. In continental margin arcs, such as the sunda arc in indonesia, forearc basins range up to 700 km in strike length.
Use acrobat to convert, edit and sign pdf files at your desk or on the go. 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. Condie, in earth as an evolving planetary system third edition, 2016. The second involves the study of the cretaceoustorecent sedimentary record in the northernmost neuquen basin western argentina through traditional field work. A fourdimensional petroleum systems model for the san. Sedimentology, provenance and geochronology of the upper. Forearc basin is a sedimentary basin formed in the arctrench gap between a volcanic arc and plate subduction zone figure 1 1. The northsouth contractional strain in the forearc manifests in upperplate faults active during the holocene, the northernmost components of which are faults within the bellingham basin. Descriptive the writer explains, defines or illustrates a concept or topic. Pdf longterm forearc basin evolution in response to changing. Forearc basin stratigraphy resulting from syntectonic. Pdf thermal basin modelling of the arauco forearc basin.
A fourdimensional petroleum systems model for the san joaquin basin province. An intriguing aspect of this process is the virtual absence of a. 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. Forearc basin stratigraphy is expected to record a detailed history of the deformation and growth pattern of an accretionary wedge. We present stratigraphic, sandstone petrographic, and upb detrital data from upper cretaceous. In particular, it helps to establish the origin of the underlying ophiolites and to unravel the earliest evolutionary stage of arctrench systems, which remain poorly understood. Pdf in situ gas concentrations in the kumano forearc. Gas hydrate saturation and distribution in the kumano. These methods possibly underestimate the in situ gas concentration due to core degassing. Author resources contact agu editor searches librarian resources media kits. Hessler1 and andrea fildani2 1the deep time institute, 8711 bluegrass drive, austin, texas 78759, u.
The east java forearc preserves a record of cenozoic sedimentation and tectonic history, and information about the character of the deeper crust. This proximity, as well as the similarity in morphology between the reentrant and an indentation in the lower arc slope. Forearc basins formed as negative alpha basins remain mostly undeformed. Pdf seismic stratigraphy and cenozoic evolution of west. Earthquake rupture would be expected along the thrust where temperatures are low enough for seismogenic failure to occur. Quaternary sediment has been routed into kumano basin from the kii peninsula and regions to the east on honshu via both large and small submarine canyons fig. Seismic stratigraphy and cenozoic evolution of west sumatra forearc basin. Gas hydrate saturation and distribution in the kumano forearc basin of the nankai trough jihui jia1 takeshi tsuji2,4 toshifumi matsuoka3 1department of urban management, kyoto university, c11118 kyotodaigakukatsura, nishikyoku, kyoto 6158540, japan. Pdf evolution of tectonosedimentary systems in the. 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.
Sedimentary basins range in size from as small as hundreds of meters to large parts of ocean. Though the magnetic anomalies are more complex to decipher the rocks sampled from backarc basin spreading centers do not differ very much from those at midocean ridges. Seismic stratigraphy and cenozoic evolution of west sumatra forearc basin article pdf available in aapg bulletin 695 may 1985 with 376 reads how we measure reads. The petroleum system in the sandino forearc basin, offshore western nicaragua. Adobe acrobat pro dc its not free, but if you need to edit and create pdfs professionally, adobe acrobat pro dc is the software for you. Pdf the petroleum system in the sandino forearc basin. The forearc basin of andaman is situated along the obliquely converging boundary of the indian plate and burmese plate characterized by active tectonics. The sw of ecuador offers a great opportunity to study the longterm behavior of an almost entire forearc system, from the external accretionary prism to the landward limit of the forearc basin. The seismic data, along with logging and core data from the integrated. Pdf evolution of the ecuador offshore forearc basin and.
Initiation and evolution of forearc basins in the central. Both basement rocks and lower tertiary sedimentary rocks were. Early sedimentation and deformation in the kumano forearc basin linked with nankai accretionary prism evolution, southwest japan. The formation of the lower magdalena amagmatic, forearc basin occurred in a stable setting from the. The underexplored sandino basin nicaragua basin trough is located within the forearc area of western nicaragua and nw costa rica. Formation of forearc basins by collision between seamounts. Though the basin evolution has been previously studied, e.
Important structural elements observed in the basin include transpressional faults and anticlinal. The first aims at understanding the conditions of kumano forearc basin offshore japan nucleation and early evolution through 3dseismic and sandstone petrography provenance analyses. The stratigraphic succession of a forearc basin provides crucial information on the history of a convergent plate margin. In addition, upb detrital zircon age spectra within the upper xigaze forearc stratigraphy are similar to those from eocene foreland basin strata south of the indus.
Processes and sedimentary features that characterize modified forearc basins include the following. Forearc basin and examine the vitrinite reflectance, consolidation yield stress, and burial depth to infer the evolution of the basin in these regions. This unit shows a relatively uniform 3 s twt thickness across the forearc basin. The malekula reentrant lies just south of the partly subducted bougainville seamount. Types, geometries, and relationships to subduction zone dynamics article pdf available in geological society of america bulletin 12856. Pdf detrital zircon upb and fission track doubledating and hf isotopes from the mesozoic and cenozoic strata in the southern alaska forearc basin. Modification of continental forearc basins by flat. Masstranport complexes in deep water of andaman forearc. Make your job easier with adobe acrobat dc, the trusted pdf creator. The carbonate platform in the forearc landward flank and the intense faulting and folding in the accretionary zone obscure its boundaries to north and south on seismic images. Forearc basins are important constituents of sediment traps along. Pdf plio quaternary segmentation of the south tyrrhenian. Pdf early sedimentation and deformation in the kumano.
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. We also study the impact of hinterland and trench sedimentation on the wedge evolution and its impact on forearc basin formation. The birth of the xigaze forearc basin in southern tibet. Rolling open earths deepest forearc basin jonathan m. Viswanath, integ, geopic, ongc, dehradun introduction the andaman basin is located in the north eastern indian ocean around andamannicobar chain of islands. Sedimentary deposits in the distal kumano forearc basin of the nankai accretionary margin off kii peninsula, japan, have been imaged using threedimensional 3d seismic data. The forearc basin sensu strictu develops coevally with the uplift of the outer forearc high estancia hills and the sedimentation of the zapotal formation at 3230 ma. Pdf forearc basins are one of the fundamental sedimentary basins, and they preserve various geological phenomena arising from dynamic interactions. Variation in forearc basin configuration and basinfilling. Yarlung suture near sangdanlin, suggesting that the xigaze forearc was a possible source of sangdanlin detritus by ca. Due to tectonic stresses as one tectonic plate rides over another, forearc regions are sources for great thrust earthquakes.
The kumano basin, located southeast of the kii peninsula, is a forearc basin in the nankai trough, where the philippine sea plate is subducting beneath the eurasia plate figure1. By integrating recent results from the basement study by mora et al. Forearc basin closure and arc accretion in the submarine suture zone south of taiwan. Forearc basins are one of the fundamental sedimentary basins, and they preserve various geological phenomena arising from dynamic interactions between. The volcanic rocks of the nearby island arc do differ from those in the basin. Farther landward, the surface rises again, reaching a maximum at the forearc high.
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