Salina-margin tepees, pisoliths, and aragonite cements, Lake MacLeod, Western Australia: Their significance in interpreting ancient analogs

Handford, C. Robertson; Kendall, A. C.; Prezbindowski, Dennis R.; Dunham, John B.; Logan, Brian W.

doi:10.1130/0091-7613(1984)12<523:stpaac>2.0.co;2

Cited by 56 publications

(28 citation statements)

References 9 publications

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“…The characteristic cements of the tepee cavities require an episodic or continuous¯ow of calciteoversaturated waters through the sediments. Recent tepee settings are located topographically below sea level, resulting in a constant¯uid¯ow from open marine areas towards the lagoon (Handford et al, 1984). In the Latema Ár lagoon, in contrast, there are no indications of a difference in sea level between the lagoon and the open sea.…”

Section: Formation Of Tepees and Exposure Horizonsmentioning

confidence: 97%

Facies architecture of an isolated carbonate platform: tracing the cycles of the Latemàr (Middle Triassic, northern Italy)

Egenhoff¹,

Peterhänsel²,

Bechstädt³

et al. 1999

Sedimentology

134

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The 720-m-thick succession of the Middle Triassic Latema Ár Massif (Dolomites, Italy) was used to reconstruct the lagoonal facies architecture of a small atoll-like carbonate platform. Facies analysis of the lagoonal sediments yields a bathymetric interpretation of the lateral facies variations, which re¯ect a syndepositional palaeorelief. Based on tracing of lagoonal¯ooding surfaces, the metre-scale shallowing-upward cycles are interpreted to be of allocyclic origin. Short-term sea-level changes led to subaerial exposure of wide parts of the marginal zone, resulting in the development of a tepee belt of varying width. Occasional emergence of the entire lagoon produced lagoon-wide decimetrethick red exposure horizons. The supratidal tepee belt in the backreef area represented the zone of maximum elevation, which circumscribed the sub-to peritidal lagoonal interior during most of the platform's development. This tepee rim, the subtidal reef and a sub-to peritidal transition zone in between stabilized the platform margin. The asymmetric width of facies belts within individual metre-scale cycles was caused by redistribution processes that re¯ect palaeowinds and storm paths from the present-day south and west. The overall succession shows stratigraphic changes on a scale of tens of metres from a basal subtidal unit, overlain by three tepee-rich intervals, separated by tepee-poor units composed of subtidal to peritidal facies. This stacking pattern re¯ects two third-order sequences during the late Anisian to early middle Ladinian.

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Section: Formation Of Tepees and Exposure Horizonsmentioning

confidence: 97%

Facies architecture of an isolated carbonate platform: tracing the cycles of the Latemàr (Middle Triassic, northern Italy)

Egenhoff¹,

Peterhänsel²,

Bechstädt³

et al. 1999

Sedimentology

134

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“…Alternatively, the restricted basins may have been subjected to some meteoritic input as suggested by their negative oxygen isotopes. Indeed coastal lakes and salinas of Western Australia display recent aragonite cement with variable O isotope signatures (negative to positive) interpreted as reflecting long-term changes of the inputs of meteoric vs marine waters (Handford et al 1984). However, the dominantly marine composition is attested by the Sambra REE patterns.…”

Section: Paleoenvironmental Reconstructionmentioning

confidence: 98%

Aragonite Crystal Fans In Neoproterozoic Cap Carbonates: A Case Study From Brazil and Implications For the Post-Snowball Earth Coastal Environment

Vieira¹,

Nédélec²,

Fabre³

et al. 2015

Journal of Sedimentary Research

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Neoproterozoic cap carbonates are characterized by ''anomalous'' sedimentary features, including sea-floor precipitates, represented by aragonite pseudomorph cement crusts and crystal fans. These features are found in restricted periods of geological history, and their generation in the context of the Neoproterozoic has been attributed to very specific postglacial conditions leading to alkalinity oversaturation. New sedimentary and geochemical results on well-preserved Neoproterozoic deposits of aragonite pseudomorph crystal fans at the base of the Sete Lagoas Formation (Bambuí Group, central Brazil) are reported. The micrite-settling facies shows the highest abundance of crystal fans, arranged in centimeterscale layers interfingered with the micrite matrix; this facies is interpreted as a result of postglacial calcium carbonate oversaturation in restricted areas characterized by marine dysoxic waters. A numerical model constrains the kinetics of formation of aragonite crystals or micrite by calculating the induction times and precipitation rates of both carbonate species for postglacial conditions of elevated temperature and high atmospheric pCO 2 . In these conditions, the Mg/Ca ratio of the Neoproterozoic seawater is calculated at ca. 1.2. Alkalinity oversaturation is monitored by a variable evaporation degree. Aragonite formation is kinetically favored, and the discrepancy between calcite and aragonite precipitation rate is greater as atmospheric pCO 2 , hence alkalinity, is higher. These modeling conditions do not preclude the contribution of incomplete organic-matter degradation to alkalinity as suggested by negative carbon isotope signatures. In addition, the large number of aragonite-micrite pairs suggests a seasonal or paleoclimatic forcing. Other cases of abiotic aragonite precipitation through time are also briefly examined by comparison.

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“…4. During the Early Miocene, reef development increased worldwide and scleractinian corals emerged as a dominant frame-building component (Hanford et al, 1984). These corals can grow at high rates, approximately 1 cm per year on the average and up to about 20 cm per year in modern studies of branching forms (Edinger et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Allostratigraphy of Punung Paleoreef based on Lithofacies Distributions, Jlubang Area, Pacitan Region-East Java

Premonowati¹,

Prastistho²,

Firdaus³

2012

Indonesian J. Geosci.

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Lithologically, Punung Formation as a paleoreef comprises coral boundstone rhodolith, algal grainstone, algal packstone, algal wackestone, algal floatstone, and algal rudstone. It is dominated by red algae and had formed a fringing reef in a warmly shallow marine environment. They built seven phases of paleoreef complex. Each paleoreef complex has been bounded by a local unconformity that is characterized by caliche. The Jaten Formation has becomes the base of the Punung paleoreef which build up by an angular unconformity contact on uppermost part. It consists of tuffaceous wacky sandstone with silicate cement. The formation as the reef base indicates two factors. The external factor because of the decrease of a volcanic activity and the internal one was caused by the depositional environment of the Jaten Formation becoming shallower. The subsurface runoff systems in many caves (like: Jaran cave and others) have the same southward direction to the dipping direction of algal grainstone lithofacies of Punung Formation. The vertical caves are formed by a jointing system. Keywords

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Salina-margin tepees, pisoliths, and aragonite cements, Lake MacLeod, Western Australia: Their significance in interpreting ancient analogs

Cited by 56 publications

References 9 publications

Facies architecture of an isolated carbonate platform: tracing the cycles of the Latemàr (Middle Triassic, northern Italy)

Facies architecture of an isolated carbonate platform: tracing the cycles of the Latemàr (Middle Triassic, northern Italy)

Aragonite Crystal Fans In Neoproterozoic Cap Carbonates: A Case Study From Brazil and Implications For the Post-Snowball Earth Coastal Environment

Allostratigraphy of Punung Paleoreef based on Lithofacies Distributions, Jlubang Area, Pacitan Region-East Java

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