Facies analysis and carbonate ramp evolution of Oligo-Miocene Asmari Formation in the Gachsaran and Bibi-Hakimeh oilfields and the nearby Mish Anticline, Zagros Basin, Iran

2015 ◽  
Vol 276 (1) ◽  
pp. 121-146 ◽  
Author(s):  
Ruhollah Shabafrooz ◽  
Asadollah Mahboubi ◽  
Hossein Vaziri-Moghaddam ◽  
Reza Moussa-vi-Harami ◽  
Ali Ghabeishavi ◽  
...  
Keyword(s):  
Facies Analysis ◽  
Carbonate Ramp ◽  
Asmari Formation ◽  
Zagros Basin

scholarly journals RETRACTED: Facies analysis and depositional environments of the Oligocene–Miocene Asmari Formation, Zagros Basin, Iran

2014 ◽  
Vol 5 (1) ◽  
pp. 103-112 ◽  
Author(s):  
Mohammad Sahraeyan ◽  
Mohammad Bahrami ◽  
Solmaz Arzaghi
Keyword(s):  
Facies Analysis ◽  
Depositional Environments ◽  
Asmari Formation ◽  
Zagros Basin

scholarly journals Evolution, paleoecology and sequence architecture of an Eocene carbonate ramp, southeast Zagros Basin, Iran

GeoArabia ◽  
2013 ◽  
Vol 18 (4) ◽  
pp. 49-80
Author(s):  
Afshin Zohdi ◽  
Reza Mousavi-Harami ◽  
Seyed Ali Moallemi ◽  
Asadollah Mahboubi ◽  
Adrian Immenhauser
Keyword(s):  
Shallow Water ◽  
Sea Level ◽  
Facies Analysis ◽  
Carbonate Platform ◽  
Middle Eocene ◽  
Depositional Environments ◽  
Carbonate Ramp ◽  
Salt Diapir ◽  
Zagros Basin ◽  
Facies Associations

ABSTRACT We document and discuss the results of detailed fieldwork, facies analysis and the subsequent integration of paleoecological evidence from the Middle Eocene carbonate ramp succession in the southeast Zagros Basin (Jahrum Formation). A combination of a sea-level fall and tectonic and diapiric basement uplift favored the initiation of the Jahrum carbonate platform. The lower portions are affected by pervasive, probably early diagenetic dolomitization, whilst the upper Jahrum consists mainly of limestone. Here, the focus is on the limestone portions of the Jahrum Formation. Based on the abundance, diversity and rapid evolutionary turnover of the alveolinids and nummulitids, the limestone intervals of the Jahrum Formation are interpreted for the upper Middle Eocene (Bartonian). The Jahrum Formation is capped by a major unconformity and overlain by the Lower Oligocene mixed clastic/carbonate Razak Formation. Based on data from field sections, eight facies associations and a series of sub-types have been established, which correspond to inner-, middle-and outer-ramp depositional environments. In their overall context, these data show a southward-dipping inner-ramp-to-basin transect. Towards the Coastal Fars (e.g. Hulur-01 Well) the Jahrum grades laterally into deep-marine Pabdeh foredeep shale units. Based on facies analysis and paleoecological evidence from larger benthic foraminifera, a major transgressive-regressive pattern is recognized in all outcrop sections of the Jahrum. The lowermost stratigraphic units of the formation are here interpreted as a distally steepened ramp. Evidence comes from abundant allochthonous shallow-water facies in the distal, deeper-ramp setting. Shallow-water carbonate clasts were exported towards the basin, a feature that is probably linked to relative sea-level fall control. Furthermore, local to regional basement instabilities by salt diapir-related basement reorganization was arguably of significance. Upsection, evidence is found that the ramp system evolved from a distally steepened to a homoclinal geometry with an overall very gentle slope geometry during the Late Bartonian. The data shown here are significant for those concerned with the Paleogene evolution of the southeast Zagros Basin and provide a well-exposed case example of a Middle Eocene carbonate ramp factory.

Biostratigraphy, paleoecology, and paleoenvironmental reconstruction of the Asmari formation in Zagros basin, southwest Iran

2016 ◽  
Vol 9 (2) ◽  
Author(s):  
Umid Kakemem ◽  
Mohammad Hossein Adabi ◽  
Abbas Sadeghi ◽  
Mohammad Hasan Kazemzadeh
Keyword(s):  
Asmari Formation ◽  
Paleoenvironmental Reconstruction ◽  
Zagros Basin ◽  
Southwest Iran

scholarly journals A CARBONATE RAMP EVOLUTION IN THE TRANSITION FROM THE APULIA PLATFORM TO THE IONIAN BASIN DURING EARLY TO LATE CRETACEOUS (NW GREECE)

2018 ◽  
Vol 40 (1) ◽  
pp. 53
Author(s):  
K. Getsos ◽  
F. Pomoni-Papaioannou ◽  
A. Zelilidis
Keyword(s):  
Sea Level ◽  
Late Cretaceous ◽  
Facies Analysis ◽  
Carbonate Ramp ◽  
Time Interval ◽  
Storm Wave ◽  
Lowermost Part ◽  
Storm Deposits ◽  
Homoclinal Ramp ◽  
Apulia Platform

Facies analysis of Cretaceous carbonate sequences from the external and central Ionian zone revealed a homoclinal ramp model of evolution. During Berriasian to Valanginian, the carbonate ramp was differentiated to an inner-mid and outer ramp environment, which corresponded to the external and central Ionian zone, respectively, while the main inner ramp environment is assumed that was located in the Pre-Apulian zone. The external Ionian zone (inner-mid ramp) is characterized by muds tones-wackes tones with fragmented echinoderms, bivalves, radiolarians and rare aptychus considered to be deposited below the fairweather wave base (FWWB). Locally, thin graded storm deposits intervene, indicating deposition above the storm weather wave base (SWB). Minor occurrences of packs tonesgrainstones, with fragmented echinoderms, calcareous algae, tubiphytes, lagenid foraminifera and rare ooids occur, as well, considered to be deposited at the lowermost part of the inner ramp, near the constantly agitated fairweather wave base (FWWB). The central Ionian zone (outer ramp) is mainly characterized by mudstones-wackestones with abundant radiolarians and rare calpionellids and calcispheres, considered to be deposited below the storm wave base (SWB). No talus or breccias deposits were observed, during the mentioned time interval, in any part of the studied area. From Hauterivian to Turonian, continual sea-level rise, led to establishment of outer ramp environment in the external Ionian zone, over the previous inner-mid ramp, and outer ramp-basin environment, over the previous outer ramp, in the central Ionian zone. The transition from shallower to deeper conditions is characterized by an overall deposition of mudstones-wackestones with abundant radiolarians rooted in pure micrite. 

scholarly journals Bio-Sequence Stratigraphy of Asmari Formation in the Southeast of Norabad (Zagros Basin, SW Iran)

2021 ◽  
Author(s):  
Mohammadsadegh Dehghanian
Keyword(s):  
Sea Level ◽  
Sequence Stratigraphy ◽  
Carbonate Platform ◽  
Reservoir Rock ◽  
Dispersion Pattern ◽  
Asmari Formation ◽  
Level Curve ◽  
Zagros Basin ◽  
Lithostratigraphic Units ◽  
Global Sea Level

Abstract Asmari Formation is the thick sequence of carbonate sediment in the range of Oligocene-Miocene which is deposited in the foreland basins of the Zagros and is considered as the original and most famous reservoir rock of Zagros basin. To study of lithostratigraphic units and sequence stratigraphy of this Formation, the section in the southeast of Norabad was selected. Field study indicated that Asmari Formation possessed the thickness of 401.5m and included 9 lithostratigraphic units. According to the study of microfacies, Stacking pattern and identification of main sequence level, three depositional sequences including two-second order and one-third order sequence were recognized. The sea-level curve in the studied section indicated that it was correspondence to the global sea level curve. These facies deposited in five environmental sedimentations as follow Open Sea Shelf (Fore Barrier), Bar, Lagoon, Back bar shelf, and Shoal. The environment is part of a carbonate platform that has been formed on an open shelf. In addition, according to the Study of foraminifer dispersion pattern the range of Asmari Formation in Norabad was suggested to be Oligocene (Rupelian- Chattian) to lower Miocene (Aquitanian- Burdigalian).

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