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Depositional environment of the Bagh-e-Vang Formation – the only occurrence of upper Lower Permian in Iran

Yegane Bizhan Yousefi, Van Loon A.J. (Tom), Fard Sakine Arefi, Farahpour Mohammad Mehdi, Sharahi Safoora Yasbolaghi

Geologos

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2021

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Vol. 27, No. 1

1--14

EN

A transgression of the Tethys Ocean occurred in east central Iran, like in other areas of the Tethys Ocean, around the Yakhtashian/Bolorian (regional chronostratigraphical units corresponding with the Artinskian/Kungurian of the Early Permian) transition. This led to the development of a carbonate platform that is represented in the Shirgesht area on the northern part of the Tabas Block by the Bagh-e-Vang Formation, which constitutes the only known sedimentary unit from the late Early Permian in Iran. Field data and thin-section analysis indicate deposition on a carbonate ramp with barriers separating a lagoonal area with intertidal mud flats from the open-marine environment. The overall transgres-sive development is indicated by the presence of open-marine sediments on top of the barrier and lagoonal sediments.

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O dynamice lagun liberyjskich w czasie pory suchej

Strupczewski W.G., Osuch M.

Przegląd Geofizyczny

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2001

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Z. 4

339-349

EN

Paper reports findings on hydrological regime of Liberian lagoons during dry season collected during over two years staying in Liberia. While traveling along shoreline in Liberia one has to cross several rivers' mouths, which are very shallow during a dry season. Hydro-meteorological processes and sea activity control process of closing and opening of rivers mouths. Although the closure of the mouth of big rivers has never been recorded, such tendency is observed at the end of dry season. In his way along seashore, one is passing by a countless number of coastal lagoons with their own drainage area. The lagoons are in the various stage of development in respect to sea-lagoon communication: Two-way communication. It is a rule during rainy season. Downstream communication only. Sea is open for lagoon, while lagoon is closed for the sea in the advanced stage of the construction of sand bar, excluding short period of high tides. Upstream communication only. The sand bar is so high that it prevents lagoon from reaching the sea. No water exchange between sea and lagoon. Liberian lagoons show unusual phenomenon of thermal inversion. There are several pits in lagoon where the temperature of the bottom layer is 3-6°C warmer tan the surface layer. The behavior of the Po river during dry season is described. The river of such size spans a gap between big Liberian rivers discharging into the sea and coastal lagoons with small catchment and in particular between fluvial and stemmed lagoons. The presented description of lagoon dynamics in respect to storage of mass, energy as well as thermal and salinity stratification shows that there are still some new challenging scientific problems, which calls for multidisciplinary investigation.

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Rekultywacja terenu składowiska osadu z uzdatniania wody w Wieliszewie

Siuta J.

Inżynieria Ekologiczna

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2001

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Nr 4

151--159

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Cechy geologiczne środowisk estuariów i lagun

Osadczuk A.

Zeszyty Naukowe. Marine Sciences / Uniwersytet Szczeciński

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1999

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Nr 5

95-133

EN

Estuaries and lagoons are specific geological environments existing on contact of the land and the sea. There are many definitions and classifications of these environments, which depend on point of view of different research disciplines. Such situation causes a lot of disagreements between specialists such domains as hydrology, geology, geomorphology, etc. Author's intention was to compile and compare of various data about these transitional geological environments. Some information were compiled regarding definitions, classifications and such geological features as hydrodynamics, lithodynamics, sedimentary processes and geochemistry of sediments of estuaries and lagoons.

5

Cechy geologiczne środowisk estuariów i lagun

Osadczuk A.

Zeszyty Naukowe. Marine Sciences / Uniwersytet Szczeciński

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1998

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Nr 5

95-133

EN

Estuaries and lagoons are specific geological environments existing on contact of the land and the sea. There are many definitions and classifications of these environments, which depend on point of view of different research disciplines. Such situation causes a lot of disagreements between specialists such domains as hydrology, geology, geomorphology, etc. Author's intention was to compile and compare of various data about these transitional geological environments. Some information were compiled regarding definitions, classifications and such geological features as hydrodynamics, lithodynamics, sedimentary, processes and geochemistry of sediments of estuaries and lagoons.