Analyses and modeling of gravity data in the dead sea pullapart basin reveal the geometry of the basin and constrain models for its evolution. Pdf geometric characteristics of pullapart basins researchgate. Feb 28, 2011 a pull apart basin is a basin formed when a kink or bend in a strikeslip fault forms a releasing section with normal faults along strike. Pullapart is a superior alternative to digging through a junk yard. Failure of the composite pull apart basin model and the role of tlf in the ncb formation. Sediments in the basin were deposited in nonmarine to coastal marine environments, and ranges in age from ordovician to cretaceous. Shape and dimensions of the cerro prieto pullapart basin, mexicali, baja california, mexico, based on the regional seismic record and surface structures. We model the threedimensional 3d crustal deformation in a deep pull apart basin as a result of relative plate motion along a transform system and compare the results to the tectonics of the. Intra arc basin foreland basin fore arc basin back arc basin h.
Crossbasin faulting and extinction of pullapart basins in. An active composite pullapart basin within the central part. The fault geometry in the sea of marmara simply reflects a transition from complex pull apart basins into single strikeslip faults. For the same purpose, the first use of the term pullapart basin by burchfiel and stewart. Assessing the role of pullapart basins for hightemperature. This is in strong contrast to death valleytype pullapart basins that are highly oblique to the transform direction with transverse normal. Frequently, the basins are rhombic or sigmoidal in shape.
Tectonic basins and rift valleys landform britannica. Sedimentation rate an overview sciencedirect topics. Structure of the dead sea pullapart basin from gravity. Dec 30, 2014 quennell, who was the first to recognize a pullapart basin without using this term, proposed that the dead sea is a void in the crust caused by the overlapping segments of the dead sea fault zone. It is a young sigmoidal pullapart basin bordered by. The vertical thickness between isochrones or equal time age lines indicates the relative amount of deposition for a given unit of time. A comparative study of well mapped active and ancient pullapart basins suggests a qualitative model for their continuous development. Tectonics and sedimentation in the fohnsdorfseckau basin. Dimensionally, basins are limited to the distance between the faults and the length of overlap. Enachescu, 2007 exploration potential of the deepwater petroleum systems of newfoundland and labrador margins. The saltpond basin is a paleozoic wrench modified pullapart basin centrally located between the tanocape three points and accraketa basins. Modern pull apart basins exhibit an instantaneous picture of structural, geomorphic, and sedimentary systems that may represent one frame in a motion picture of pull apart basin evolution. By analysing the basin architectures and structures of each structural unit, calculating the fault growth index, and referring to the sandbox modelling results, we consider that the oujiang sag belongs to a strike.
The kashmir basin i s suggested to have formed through a piggyback basin deformation style, however new studies alam et al. As a general rule, for every three units in length, pullapart basins are a single unit in width. Tectonic basins and rift valleys, landforms characterized by relatively steep, mountainous sides and flat floors. Intracontinental quaternary volcanism in the niksar pullapart basin. The san andreas fault terminates along the eastern margin of the lake basin, but steps across the lake to the imperial fault, which forms its western margin. Pullapart basin formation and development in narrow. This simple block model shows a simple example of a pull. Pull apart basin formation and development in narrow transform zones with application to the dead sea basin j. The petrography and chemistry of the timiskaming volcanics of the kirkland lake area reveal three distinct yet intimately associated suites within a composite volcanicsedimentary sequence.
Development of pullapart basins the journal of geology. In the third dimension, the depth of the pullapart basin is related to the length in an equation presented by. These two apparently opposing ideas in fact, are not in conflict with each other. A variant of the pull apart model was proposed by nabelek et al. Modelling the influence of preexisting brittle fabrics on. The model is based on results of threedimensional upper crustal elastic models of deformation, field observations, and fault theory, and is generally applicable to basin scale features, but predicts some intra basin structural features. Pdf pullapart basin formation and development in narrow. The pullapart basins and structures on gozo island 54 8.
Modern pullapart basins exhibit an instantaneous picture of structural, geomorphic, and sedimentary systems that may represent one frame in a motion picture of pullapart basin evolution. In geology, a basin is a region where subsidence generates accommodation space for the deposition of sediments. Sedimentary basins range in size from as small as hundreds of meters to large parts of ocean. The geometry of spb is of rhomboidal shape characterized by dual depocenters separated by a discrete structural high in the center of spb. Mechanical aspects of pullapart basins and pushup swells with applications to the dead sea transform.
Three hundred kilometers of continuous marine gravity data, collected in a lake occupying the northern part of the basin, were. Pullaparts evolve from incipient to extremely developed basins through a sequence of closely related states. A pull apart basin is a basin formed when a kink or bend in a strikeslip fault forms a releasing section with normal faults along strike. The generation of marginal basins as pullapart basins along intracontinental strikeslip faults is a mechanism which has been proposed by other authors.
The fault geometry in the sea of marmara simply reflects a transition from complex pullapart basins into single strikeslip faults. Structural mechanism comprises overstep basin and faultbend basin figure 1. During a first pullapart phase, subsidence occurred along enetrending, sinistral strikeslip faults of the murmurz fault system and nesw to nstrending normal faults, forming a composite pullapart basin between. Pdf similarities between vienna basin in austria and. Pages in category pull apart basins the following 7 pages are in this category, out of 7 total.
Pdf development of pullapart basins dwight bradley. Structure of the dead sea pull apart basin from gravity analyses. Pull apart is a superior alternative to digging through a junk yard. We present a model for the origin, crustal architecture, and evolution of pull apart basins. Stepover basins transtensional or pullapart basins c. Sumatran arc, gulf of california, pull apart basin, volcanic geothermal system. Research geometric characteristics of pullapart basins. A pull apart basin is a structural basin where two overlapping en echelon faults or a fault bend creates an area of crustal extension undergoing tension, which causes the basin to sink down. New insights into the origin of the north anatolian shear zone. Initiation, evolution and extinction of pullapart basins. Timiskaming volcanism in the kirkland lake area, ontario. Both faults are rightlateral and because they step to the right, they pull the area apart inbetween them. Sandbox analogue models of pullapart basins that developed in sedimentary strata above releasing steps in underlying basement faults are characterized by rhombic basins that are flatbottomed box grabens with a subhorizontal synkinematic basin infill. Sandbox analogue models of pull apart basins that developed in sedimentary strata above releasing steps in underlying basement faults are characterized by rhombic basins that are flatbottomed box grabens with a subhorizontal synkinematic basin infill.
The spb have been developed as a transtensional pull apart basin resulted from stepping over of the semangko to ujung kulon segments of the sfz. A pullapart basin is a structural basin where two overlapping en echelon faults or a fault bend creates an area of crustal extension undergoing tension, which causes the basin to sink down. Pull apart basins and pushup swells are common features at steps along strikeslip faults. The salton sea is an evolving pullapart basin located between the san andreas and imperial faults in southern california. Stop by to find used car parts or call us to get cash for your junk car today. The niksar basin is sited along the eastern segment of the north anatolian fault zone in turkey. The tectonic framework of a complex pullapart basin. So, get ready to experience some of anzaborregos most geologically rich areas on your. Plots of the log of basin length versus width for the 62 basins show a welldefined linear correlation between length and width, although the value of 3. The experimental results also provide insights into the tectonosedimentary evolution of the satpura basin in particular and pullapart basins in general. Pullapart origin of the satpura gondwana basin, central india. These basins are called pull apart basins because the crust is literally pulled apart in the section between the two strikeslip faults.
Benavraham editor, sedimentary basins within the dead sea and other rift zones. Geologists refer to this region as the salton trough, as it is located within an active pullapart basin. A simple model suggests that the width of the rhombs is controlled by the initial fault geometry, whereas the length increases with increasing fault displacement. A simple model suggests that the width of the rhombs is controlled by the initial fault geometry, whereas the. When an earthquake occurs along one such fault segment, after a short time interval the stress changes caused by that earthquake trigger rupture on the other segment. Other articles where pull apart basin is discussed. The lough neagh basin in northern ireland is the site of a cenozoic depocentre defined by\ud gravity measurements and a thick succession. The basin is located within a valley which defines the dead sea transform plate boundary between africa and arabia. Basin inversion can happen when there is a reversal or rotation in regional tectonics, which can. Simultaneous formation of pull apart basins and pushup ridges 55 8. The new model is structurally impossibl e, an d conflicts with the geomorphology, geology, and tectonic setting of kashmir basin. The steep sides are created by displacement on faults such that the valley floor moves down relative to the surrounding margins, or, conversely, the margins move up relative to the. Sedimentation rate defines how fast the overburden load is applied to the compacting sedimentary formations deposited. But implicit in the concept of a sedimentary basin is the existence of.
The purpose of this paper is to add to our current knowledge of sedimentation in pullapart basins by describing and. Pdf structure of the dead sea pullapart basin from. These basins are called pullapart basins because the crust is literally pulled apart in the section between the two strikeslip faults. A variant of the pullapart model was proposed by nabelek et al. Accordingly, the stress below a pullapart basin that has formed at a segment boundary remains high until new fractures form, and earthquakes tend to initiate there. Pullapart basins are structural depressions that localized on the geometric irregularities along strikeslip faults where. The pull apart basins and structures on gozo island 54 8.
Stepover basins transtensional or pull apart basins c. Geometric characteristics of pullapart basins lithosphere. The basins are bounded by fault systems with normal or obliqueslip kinematics basin sidewall faults, bsfs which form in the direction roughly orthogonal to the strikeslip displacement and are directly connected to the. Quennell, who was the first to recognize a pullapart basin without using this term, proposed that the dead sea is a void in the crust caused by the overlapping segments of the dead sea fault zone. Accordingly, the stress below a pull apart basin that has formed at a segment boundary remains high until new fractures form, and earthquakes tend to initiate there. The tarutung pull apart basin is characterized by a complex structure reflected by a broader distribution of seismicity compared with the very narrow, rather vertical. Simultaneous formation of pullapart basins and pushup ridges 55 8. The geodynamic model boundary conditions forces the formation of pullapart basins. Pull apart basin tectonic model is structurally impossible. Pdf pullapart basins are depressions bounded on their sides by two or more strikeslip faults and on their ends by. Shape and dimensions of the cerro prieto pullapart basin. Failure of the composite pullapart basin model and the role of tlf in the ncb formation.
Mechanical aspects of pull apart basins and pushup swells with applications to the dead sea transform. Purchase of an open document does not constitute license for republication in any form, nor does it allow web posting without prior written permission. The purpose of this paper is to add to our current knowledge of sedimentation in pull apart basins by describing and. Pullapart basins are laterally limited by segments of transcurrent faults standard strikeslip faults, ssfs, which constitute the principal deformation zone pdz.
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