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Geosphere ; 12 4 : - Active-source, seismic-reflection data constrain the geometry of the active detachment fault and indicate two structural domains. Seismic facies reflect its sedimentary environment and processes. Seismic facies 1 is high-amplitude, laterally continuous reflectors that represent flooding and prolonged lacustrine conditions. Seismic facies 2 is high- to low-amplitude, laterally discontinuous reflectors also representing flooding conditions. Seismic facies 3 is low-amplitude, poorly contrasted continuous to discontinuous reflectors interpreted as subaerial distal fan sandstone deposits. Seismic facies 4 is high-amplitude, discontinuous, imbricated to a chaotic pattern of reflectors.

Horizon 1 is the first laterally continuous reflector across the basin. Intervals of low to medium amplitude laterally wedge out westward and interfinger with chaotic reflectors of facies 4.

Unit 1 includes upwards a thick interval of laterally long and continuous reflectors sequence 1. Shorter, high-amplitude continuous reflectors that lap on the west distinctively form the lower part of this interval and form local angular unconformities within a smaller km-wide depocenter Fig.

Upwards, facies 1 is laterally continuous both east and west and expands over a broader depocenter.

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An eastward migration of the depocenter is depicted upward in profile Fig. Up section, the concave shape of reflectors shift toward the east, and sedimentary sequences thicken in the east and central parts of each depocenter. Depocenters define lens-shaped deposits that laterally wedge out and terminate in onlap against the continuous reflectors of facies 1 below. A new continuous reflector of facies 1 covers the lens-shaped deposit and defines a new sequence.

However, the low resolution and low number of seismic lines prevent a detailed interpretation and correlation of most sequence boundaries. Nevertheless, an important observation is the eastward thickening of the two lowermost sequences adjacent to CDD in profilewhereas the three upper sequences are symmetric lenses, and the thicker intervals are located km west of the breakaway fault of the detachment Figs.

A -m-thick interval of low-amplitude reflectors cf. Chaotic and diffuse reflectors characterize facies 4, which laterally passes into subparallel and continuous, high-amplitude reflectors facies 1 and 2. In seismic lines and Fig. An independent evidence of eastward progradation of facies 4 is depicted in the northwestern half of longitudinal profile b Fig.

High-amplitude continuous to discontinuous reflectors facies 1 and 2 above basement alternate at intervals tens to a few hundred meters thick.

Here the thickest basin fill corresponds to the site where the acoustic basement in the hanging wall intersects the acoustic basement in the footwall block. This intersection represents the minimum amount of subsidence in LSB controlled by the detachment fault.

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We also estimate the minimum displacement along the fault plane and its vertical and horizontal components Fig. From profile Fig. The vertical component e.

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The 9. This yields nearly km of displacement in the CDD. A distinctive feature in the two seismic images of the CDD at depth is the eastward shift of the depocenter through time.

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Interestingly, the two lower sequences are wedge shaped with a maximum thickness adjacent to the fault plane Figs. The upper three units are quasi-symmetric in shape and thicken in the central synform.

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We interpret that depocenters in the two lower sequences developed closer to the fault plane likely with a higher fault dip. As the detachment fault becomes low angle, the horizontal component increases and displaces the depocenter basinward as proposed by Fletr and Spelz Furthermore, in the southernmost seismic image profileFig.

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Profile Fig. These last events are concentrated in the northwestern basin domain, and no correlation with faults antithetic to the CDD is observed. The top of this lower unit is an erosional unconformity underlying a narrow basin depocenter.

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Above the lower sequence boundary, the sedimentary sequences have a quasi-symmetric synform shape cf. We interpret that sequence 1 in profile Fig. Sequences 3, 4, and 5 maintain their thickness across the seismic profileand seismic reflections gently dip toward the east, whereas sequence 2 is wedge shaped and nearly m-thick sediments juxtapose the CDD.

The CDD likely includes synthetic and antithetic faults that merge at depth into the master fault. The two deeper synthetic faults are likely inactive and do not propagate upwards Fig. Fletr and Spelz, Both control the modern depocenter and subsidence in the northern half of the basin.

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The Chupamirtos fault bounds the Cerro Colorado basin along the west-southwest and likely intersects the CDD north of seismic profile Fig. The Chupamirtos fault likely represents the structural boundary between two basin domains. Profile b Fig. An independent estimate of depth to basement is the eastward projection of acoustic basement in profile This calculation suggests a somewhat deeper depocenter as proposed by the 2D gravity modeling.

The contrast in structural style and the amount of subsidence among the north basin domain controlled by the dextral oblique Laguna Salada fault and the south basin domain controlled by the CDD fault requires a structural boundary likely in the Chupamirtos fault Mueller and Rockwell, Several faults cut the basement along the west side of LSB Figs.

We interpret that these faults are a clear expression of several synthetic and antithetic faults cutting the hanging wall of the detachment and probably accommodating significant amounts of basin subsidence.

Curiously, these faults roughly follow the west shoreline of the lake, and Figure 8 shows the direction of apparent dip in each of these faults in the seismic sections as indicated by yellow marks of apparent strike and dip. The amount of subsidence is also a minimum because mechanical compaction reduces the original porosity and sedimentary thickness and underestimates the original volume of sedimentary deposits and the amount of subsidence Giles, Nevertheless, a crude estimate of the rates of extension and vertical subsidence suggests a ratio ofrespectively.

The lower sedimentary unit reported in Laguna Salada is the Imperial mudstone unit, which may correlate to either the Latrania Formation dated 5.

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Although this unit overlies crystalline basement in fault contact, and a slip in the detachment may have started synchronously with marine deposition. If we conservatively assign 7 Ma for the onset of extension, the 9.

The 2. Elsewhere, examples of concurrent strike-slip faults and low-angle normal faults are reported in Mormon Mountains-Tule Springs Hills, Nevada Wernicke,Panamint Valley in California Wernicke, ; Numelin et al. It seems that detachment faults and coeval strike-slip faults constitute a common and efficient way to partition oblique strain in the northern Gulf of California Axen and Fletr, Laguna Salada is unique among these examples because it is the only documented site of coeval active deformation.

It is possible that detachment faults initiated during the early phase of transtension and produced a broader supradetachment depocenter that was subsequently overprinted by the Laguna Salada fault.

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The CDD and Laguna Salada faults are, thus, a common example of coexistence of two fundamental modes of deformation and strain partition in the northern Gulf of California rift. Transversal profiles in southern Laguna Salada Basin domain show that seismic facies 4 dominate the western portion of the seismic images, and facies 1 and 2 dominate the eastern part, where depocenters define the thicker sedimentary fill.

Profiles Fig. Due to their lateral continuity, facies 1 and 2 are interpreted to represent flooding and prolonged lacustrine conditions produced by the Colorado River entering Laguna Salada Basin.

We speculate that the prolonged lake condition must have occurred during major sea level highstands, similar to the present time.

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This condition reduces the length and topographic relief for the fluvial runoff in the delta plain, and fluvial discharges reach supratidal flats and the delta front closer to the southern inlet that connects Laguna Salada and the northern Gulf of California.

Fluvial channels acquire a steeper profile, preventing Laguna Salada to retain water during prolonged periods of time. During lowstand sea level, Laguna Salada is intermittently dry, and playa-lake deposits must enhance progradation of alluvial fan and eolian deposits into the basin floor. These conditions might be similar to the modern situation in LSB produced by damming the Colorado River since the early part of the twentieth century. Inflooding in the delta occurred due to the release of excess water in the river dam system.

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The event produced estuarine conditions in Laguna Salada for nearly five years and then dried out by ca. Two main processes likely cause the broad belt of alluvial fan deposits along the western margin.

Lacustrine deposits likely prevail for a longer time along the eastern basin margin due to higher subsidence rates and intermittent flooding of the Colorado River and locally from the Sierra Juarez mountain range.

During flooding events, mostly silt and clay are transported in suspension into the lake basin and continuously accumulate over larger areas in the Laguna Salada. Climatic forcing and changes in sea level likely control the shift from estuarine conditions flooding to hyper-arid playa lake conditions e. The older, deeper, and narrower depocenters depicted in seismic lines and Figs.

The most important erosional feature is observed in profile Sequences 2 and 3 unconformably overlie the lower lenticular sequence and have a strong asymmetric thickness controlled by the detachment fault Fig.

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In both and profiles, the upper sedimentary sequences have a broader distribution and uniform thickness across the basin, although slightly thicker to the east.

We interpret the eastward shift of the depocenter as related to the widening of the basin and to a lower angle in the detachment fault. The low-amplitude wavy reflectors of seismic facies 3 are commonly observed above facies F1 to lateral interfingering on intervals of facies F2 and F1.

This seismic facies implies a small lithological contrast among strata and probably represents sandstone-siltstone facies, as indicated in profile located 1.

This lithological change in well ELS-2 also corresponds to a change in seismic facies from low-amplitude, poorly contrasted seismic reflections of facies F3 to high-amplitude and continuous reflectors of facies F1. The south part of longitudinal profile b Fig. Modern alluvial fans progradate and narrow the flood plain and channel in the southernmost part of the basin. However, interpretation of seismic sequences and facies distribution is limited due to low resolution and low number of seismic lines and is beyond the scope of this paper.

Nevertheless, it is clear that the sedimentary record in LSB responds to both tectonic and climatic controls and constitutes an important archive yet to be explored in detail. The processing and interpretation of five seismic profiles indicate that these two master faults define two distinctive basin domains. The supradetachment basin domain accumulates a sedimentary wedge more than 2.

The north domain is a pull apart controlled by the northwest-trending, west-dipping, dextral-oblique Laguna Salada fault. We recognize four seismic facies representing the dominant sedimentary environments.

Facies 1 and 2 are high-amplitude, laterally continuous reflectors that represent flooding and prolonged lacustrine conditions. Facies 3 is low-amplitude, poorly contrasted continuous to discontinuous reflectors interpreted as distal alluvial fan sandstone deposits, whereas facies 4 is high-amplitude, discontinuous, imbricated to a chaotic pattern of reflectors. We interpret facies 4 as high-energy, alluvial-fan coarse-grained deposits prograding over the basin floor from the west in the range front of Sierra Juarez.

Seismic facies 1 and 2 predominate in the east and central portions of seismic profiles where the depocenter accumulates thick, fine-grained sedimentary sequences. Constructive comments and suggestions by reviewer Dr. Gary Axen improved this manuscript. Seismic profiles in two-way travel time TWTT and their velocity models used for depth conversion. The inset map shows the major tectonic features of northwestern Mexico and the location of the study area i. Red lines correspond to principal faults.

Yellow star is the 7. The boundary of flooding is displayed with white line. The modern course of the Colorado River appears in blue. The yellow stars denote epicenter location of the three major historical earthquakes recorded in the study area two in Laguna Salada [LSE] and the El Mayor-Cucapah earthquakes [EMC]indicating year and magnitudes. Horizons H-A blue dashed line and H-B orange dashed line are boundaries between units andrespectively, and will appear in subsequent figures.

A Profile see inset map and Figs. B Profile The yellow line follows the acoustic basement along the seismic section.

The fault located in the SW sector of the seismic profile coincides with the western shore of the lagoon flood plain.

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For both A and Byellow line is the acoustic basement. Horizons in black are sequence interpreted boundaries. Other interpreted faults are red lines see Fig. A Profile a see inset map for location along the south basin domain. Well ELS-2 is located 1 km to the east of this seismic line.

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B Profile b. A NW-dipping normal fault offsets the acoustic basement and roughly coincides with the lagoon shoreline.

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Note, again, the correspondence of these reflectors with the boundary between units 3 and 4 and the depth to the crystalline basement. The red lines are the interpreted fault. Note again the correspondence of these reflectors with the boundary between units 3 and 4 and the depth to the crystalline basement.

Only acoustic basement and two faults are interpreted due to lower resolution of this seismic image. Geologic cross section derived from the seismic profile Fig.

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Faults interpreted in the geo-seismic sections are indicated by a yellow line with a dot in the downthrown block. These yellow lines faults roughly follow the west shoreline of the lake. The red lines are faults mapped by various authors e.

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