Autor: Ghaderi, Abbas - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Sporadoceratid ammonoids from the Shotori Range (east-central Iran) - a case of putative gigantism caused by hydraulic sorting?
Autorzy:: Korn, Dieter
Ghaderi, Abbas
Devaere, Léa
Hairapetian, Vachik
Khanehbad, Mohammad
Belka, Zdzisław
Tematy:: Late Devonian
Famennian
Iran
ammonoids
body size
conodonts
dewon
famen
amonoidy
rozmiar
konodonty; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/949758.pdf Link otwiera się w nowym oknie
Źródło:: Acta Geologica Polonica; 2019, 69, 1; 27-49
0001-5709
Pojawia się w:: Acta Geologica Polonica
Opis:: The Shotori Range of east-central Iran (east of Tabas) has yielded Famennian ammonoid assemblages dominated by the family Sporadoceratidae. Four genera Maeneceras Hyatt, 1884, Iranoceras Walliser, 1966, Sporadoceras Hyatt, 1884 and Erfoudites Korn, 1999 are represented. The conodont assemblage of one sample containing Iranoceras revealed an Upper marginifera Zone age. The ammonoid assemblages are characterised by comparatively large specimens; they reach conch diameters of 300 mm (including the body chamber) and the mean size is larger than 100 mm. The preservation of the material from the Shotori Range and size comparison with sporadoceratid assemblages from the Anti-Atlas of Morocco and the Rhenish Mountains of Germany suggest that hydraulic sorting has resulted in a bias towards large conchs, explaining the size distribution, rather than latitudinal differences. The new species Maeneceras tabasense is described; the genus Iranoceras is revised with a new description of the two species Iranoceras pachydiscus (Walliser, 1966) and Iranoceras pingue (Walliser, 1966).
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Biostratigraphy, microfacies, and reservoir quality of the Oligocene Qom Formation (Kharzan Section, north-west of Ardestan, central Iran)
Autorzy:: Arani, Asma Aftabi
Ashouri, Ali Reza
Daneshian, Jahanbakhsh
Ghaderi, Abbas
Wood, David A.
Tematy:: Oligocene
benthic foraminifera
sedimentary environment
reservoir quality
Qom Formation
central Iran; Pokaż więcej
Data publikacji:: 2023
Powiązania:: https://bibliotekanauki.pl/articles/58907092.pdf Link otwiera się w nowym oknie
Źródło:: Geological Quarterly; 2023, 67, 3
1641-7291
Pojawia się w:: Geological Quarterly
Opis:: The central Iran Basin is a region with unique environmental characteristics in which the Late Paleogene–Early Neogene benthic foraminifera display distinctive distributions and abundances that can assist in identifying the intervals with the best reservoir potential. Lipidocyclinid and miogypsinid zonal marker taxa in this region can be correlated with those in the SBZ23 region (European Basin), indicating an Oligocene (Chattian) age. With sedimentation of continental strata of the Upper Red Formation following the marine succession of the Qom Formation, it seems that the last Tethyan marine transgression in the Ardestan region in central Iran occurred in the Oligocene, and the Tethyan seaway was permanently closed during the Miocene. Seven carbonate microfacies and marl or silty marl facies were identified in the study area based on field investigations, textural analysis and faunal assemblages. These microfacies were deposited on an open-shelf carbonate platform in lagoonal, patch-reef, and open-marine belts that effectively define both inner and middle-shelf environments. Micritization, cementation, mechanical and chemical compaction, dissolution and fracturing are the most important diagenetic processes controlling reservoir quality in the Qom Formation. The investigation of these processes in the facies of the Qom formation in the Kharzan section revealed that intervals associated with shallow lagoonal depositional environments display better reservoir quality than other formation intervals, due to dissolution and fracturing.
Dostawca treści:: Biblioteka Nauki

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