Prograding Tidal-Flat Sequences: Hutchison Embayment, Shark Bay, Western Australia

Hagan, Gregory M.; Logan, Brian W.

doi:10.1007/978-3-642-88494-8_25

Cited by 11 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Stromatolites comparable to modern intertidal types (Hagan & Logan, 1975) indicate periods of only moderate storm activity and probably intertidal conditions. However, the absence of pond and levee deposits, which have a high potential for preservation (Hardie, 1977), and the generally winnowed, grainy sediments of the sand cay facies suggest that conditions on the Ladinian platforms were unfavourable to tidalflat development (see later section).…”

Section: Depositional Enoironmentmentioning

confidence: 97%

Isolated stationary carbonate platforms: the Middle Triassic (Ladinian) of the Marmolada area, Dolomites, Italy

Blendinger

1986

Sedimentology

View full text Add to dashboard Cite

As a result of a phase of extensional tectonics in the western Tethyan region, a horst and graben topography formed during the Middle Triassic (Ladinian) in northern Italy. Horsts were sites of shallow water carbonate sedimentation, while pelagic and volcaniclastic sediments were deposited in the grabens. Two carbonate platforms approximately 500 m thick can be distinguished in the Marmolada area of the Dolomites: the Marmolada platform proper, which covered an area of 6 km2, and the Costabella platform, which extended for about 12 km in a NW‐SE direction and was about 3 km across. The facies of these isolated platforms reflect the influence of storms from the SW. Windward platform margins were characterized by a marine sand belt of skeletal and aggregate grainstones with a dominant platform directed cross‐stratification. The central portions of the platforms were occupied by supratidal sand cays which are made up of storm washovers. Leeward parts of the platforms are composed of shallow subtidal sand flat deposits. Laterally discontinuous reefs chiefly composed of various calcareous algae are developed at the outer margins of the platforms. Along windward margins, reefs may form a belt several hundred metres wide; along leeward margins their width is commonly reduced to some tens of metres. Foreslope talus breccias surround the platforms. Clinoform bedding showing basinward dips of 30°‐40° is typical of this facies belt, which is approximately 2 km wide. Basinal sediments, only some tens of metres thick, are radiolarian micrites. Abundant sediment‐gravity‐flow deposits expand the basinal sequence at the toes of windward margins and were probably triggered by storm return flows. Synsedimentary faults striking both NNE‐SSW and NW‐SE separate the bedded platform limestones from flank deposits and reefs. They account for the stationary nature of the platforms. Neptunian dykes show preferred NNE‐SSW and E‐W trends. Sinistral displacements are associated with NW‐SE trending faults. Depressions in the basins, filled with red, turbiditic pelagic sediments, show N‐S trends and are probably compressional in origin. The structural pattern may have resulted from oblique, NW‐SE oriented extension of the E‐W trending Middle Triassic graben zone of the Dolomites. In the Ladinian of the Dolomites, the stationary platform type can be distinguished from a retrograding type, whereas continuously prograding platforms apparently did not develop.

show abstract

Section: Depositional Enoironmentmentioning

confidence: 97%

Isolated stationary carbonate platforms: the Middle Triassic (Ladinian) of the Marmolada area, Dolomites, Italy

Blendinger

1986

Sedimentology

View full text Add to dashboard Cite

show abstract

“…Sediments of the tidal flats of Hamelin Pool are largely composed of different types of microbialites, oolitic, skeletal, peloidal, and intraclastic sands, and intraclastic breccias, which may be locally disrupted by gypsum crystals in upper intertidal to supratidal zones (see Fig. 1B;Davies, 1970; J o u r n a l P r e -p r o o f Cebulski, 1970;Hagan and Logan, 1977;Woods and Brown, 1977;Collins, 2011, 2012;James and Jones, 2016). These main components, except the skeletal sands, are very similar to those of the peritidal deposits of the Oncala Group, which supports the interpretation that the studied fossil succession was developed in tidal flats characterized by high water salinities in which microbial mats were extensively produced and reworked.…”

Section: Palaeoenvironmental Reconstruction Of the Peritidal Deposits...mentioning

confidence: 99%

“…Due to significantly lower annual rainfall (72 mm) and much higher annual evaporation (2,75 m) in the Arabian Gulf than in Shark Bay, evaporite precipitation is much larger in the sabkhas of Abu Dhabi and anhydrite nodules can be formed (Shearman, 1978;Butler et al, 1982;Warren and Kendall, 1985;Warren, 2016). In supratidal flats of Shark Bay, where the annual rainfall is 20-22 cm and the annual evaporation is 200-220 cm, only disperse gypsum crystals occur (Davies, 1970;Logan and Cebulski, 1970;Hagan and Logan, 1977;Woods and Brown, 1977;James and Jones, 2016).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%