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Volume 32, Issue 6
  • E-ISSN: 1365-2117

Abstract

[Abstract

The architecture of salt diapir‐flank strata (i.e. halokinetic sequences) is controlled by the interplay between volumetric diapiric flux and sediment accumulation. Halokinetic sequences consist of unconformity‐bounded packages of thinned and folded strata formed by drape folding around passive diapirs. They are described by two end‐members: (a) , which are characterized by narrow zones of folding (<200 m) and high taper angles (>70°); and (b) , typified by broad zones of folding (300–1000 m) and low taper angles (<30°). Hooks and wedges stack to form tabular and tapered composite halokinetic sequences (CHS) respectively. CHSs were most thoroughly described from outcrop‐based studies that, although able to capture their high‐resolution facies variations, are limited in describing their 4D variability. This study integrates 3D seismic data from the Precaspian Basin and restorations to examine variations in CHS architecture through time and space along diapirs with variable plan‐form and cross‐sectional geometries. The diapirs consist of curvilinear walls that vary from upright to inclined and locally display well‐developed salt shoulders and/or laterally transition into rollers. CHS are highly variable in both time and space, even along a single diapir or minibasin. A single CHS can transition along a salt wall from tabular to tapered geometries. They can be downturned and exhibit rollover‐synclinal geometries with thickening towards the diapir above salt shoulders. Inclined walls present a greater proportion of tapered CHSs implying an overall greater ratio between sediment accumulation and salt‐rise relatively to vertical walls. In terms of vertical stacking, CHS can present a typical zonation with lower tapered, intermediate tabular and upper tapered CHSs, but also unique patterns where the lower sequences are tabular and transition upward to tapered CHS. The study demonstrates that CHSs are more variable than previously documented, indicating a complex interplay between volumetric salt rise, diapir‐flank geometry, sediment accumulation and roof dimensions.

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Representative sections illustrating the CHS variability and near‐diapir stratal architecture across two distinct diapir‐flank geometries: (a) inclined diapir flank and (b) vertical diapir.

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Basin Research © 2020 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists © 2020 The Authors. Basin Research © 2020 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists
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2020-11-22
2024-04-25

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Four‐dimensional Variability of Composite Halokinetic Sequences
Basin Research 32, 1277 (2020); https://doi.org/10.1111/bre.12428
/content/journals/10.1111/bre.12428
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