Revision of the age of the Qom Formation in the Central Iran Basin, Iran

Zhu, Youhua; Qi, Yuping; Binggao, Zhang; Yang, Hang; He, Chengquan; Wang, Shihu; Wen, Zhou; Qiang, Zhu; Li, Zheng

doi:10.1016/j.jseaes.2006.04.012

Cited by 14 publications

(18 citation statements)

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“…This basin has been examined since 1934 because of economic interests (Furon and Marie, 1939;Abaie et al, 1964). Most of those studies were carried out based on the distribution of larger assemblages of benthic foraminifers and sedimentary sequences (Furon and Marie, 1939;Furon, 1941;Furrer and Soder, 1955;Gansser, 1955;Dozy, 1944Dozy, , 1945Dozy, , 1955Abaie et al, 1964;Bozorgnia, 1966;Kashfi, 1988;Aghanabati, 2003;Daneshian and Ramezani Dana, 2007;Zhu et al, 2007;Behforouzi and Safari, 2011). In general, the Lower Red Formation underlies the Qom Formation; on the other hand, this unit is conformably overlain by the Upper Red Formation (Stöcklin and Setudehina, 1991).…”

Section: Introductionmentioning

confidence: 99%

“…Reuter et al (2009) recognized two basins for the Qom Formation: the Qom backarc basin and Isfahan-Sirjan forearc basin ( Figure 1). Subsequently, Oligocene-Miocene sedimentation in the Qom basin took place along a ramp carbonate platform including: intertidal, shelf lagoon, platform margin and open marine environments (Aghanabati, 2003;Seyrafian and Toraby, 2005;Daneshian and Ramezani Dana, 2007;Zhu et al, 2007;Behforouzi and Safari, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Foraminiferal paleoecology and paleoenvironmental reconstructions of the lower Miocene deposits of the Qom Formation in Northeastern Isfahan, Central Iran

Nouradini

Azami

Hamad

et al. 2015

BSGM

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The early Miocene Qom Formation is exposed in the Bagh section, northeast Isfahan, Central Iran, where it unconformably overlies Oligocene deposits and is unconformably overlain by the Upper Red Formation. The formation is mainly represented by carbonate deposits (marl, marly limestone facies) and subordinate siliciclastic facies. The planktonic foraminiferal biostratigraphical analysis led to recognition of two main planktonic foraminiferal zones: 1. the Globigerinoides primordius Zone in the lowermost part of the section indicating early Miocene (Aquitanian) and 2. the Globigerinoides trilobus Zone in the upper most part of the Qom Formation of Burdigalian age (early Miocene). Composition and abundance of benthic and planktonic foraminifers were examined for paleoenvironment reconstruction and paleoecology. The Q-mode cluster analysis performed on the benthic foraminifers led us subdivide the section into three distinct benthic foraminiferal clusters: I. the Cibicidoides ungerianus cluster in the lower part of succession, indicating predominantly inner neritic environments; II. the Lenticulina orbicularis cluster in the middle part of section, indicative of middle-outer neritic environments, and III. the Elphidium-Amphistegina cluster recorded in the upper part of the formation and characterizing a typical outer neritic environment. The planktonic foraminifers are interspersed in the upper part of the section with relatively low diversity, indicating open marine shelf segments, whereas the lower part of the section is characterized by an abundance of benthic foraminifers. As a point to consider for paleoecology and paleoenvironment, abundant although with low diversity benthic foraminifera with small tests, and calculated data based on these clusters are indicative of high nutrient and high oxygen environment with normal marine salinity during the early Miocene at the Bagh section.Keywords: Aquitanian, Burdigalian, benthic foraminifera, paleoenvironmental condition. Resumen

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Foraminiferal paleoecology and paleoenvironmental reconstructions of the lower Miocene deposits of the Qom Formation in Northeastern Isfahan, Central Iran

Nouradini

Azami

Hamad

et al. 2015

BSGM

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“…In the paper ''Revision of the age of the Qom Formation in the Central Iran Basin, Iran", (Zhu et al, 2007) presented a new age model for the Qom Formation in Central Iran. Based on benthic foraminifers, ostracods, dinoflagellate cysts and calcareous nannoplankton assemblages from two sections in the Qom-Kashan area (sections 8 and 18 in Zhu et al), the age of the Qom Formation was assigned to the Eocene.…”

Section: Introductionmentioning

confidence: 99%

“…In the course of several research projects on Late Oligocene-Early Miocene circum-Mediterranean and Western Indo-Pacific palaeobiogeographic relations, we also studied a variety of fossil groups (planktic and benthic foraminifers, corals, gastropods, bivalves, echinoids, calcareous nannoplankton) from the Qom Formation. The studied sections are located in the Qom Basin as well as in the Esfahan-Sirjan Basin, amongst them the type section of the Qom Formation near Qom, which is close to section 18 of Zhu et al (2007). The section SW Kashan close to the village Chalhegareh is equivalent to section 8 of Zhu et al (2007).…”

Section: Introductionmentioning

confidence: 99%

“…The studied sections are located in the Qom Basin as well as in the Esfahan-Sirjan Basin, amongst them the type section of the Qom Formation near Qom, which is close to section 18 of Zhu et al (2007). The section SW Kashan close to the village Chalhegareh is equivalent to section 8 of Zhu et al (2007). All studied fossil groups revealed an Oligocene-Miocene age, which is consistent with earlier studies as well as with the geodynamic development of the Middle East region and the sea-level curve of Hardenbol et al, (1998;Schuster and Wielandt, 1999;Schuster, 2002a,b;Harzhauser, 2004;Harzhauser et al, 2007;Reuter et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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