Late Paleocene Orthophragminae (Foraminifera) from the Haymana-Polatli Basin, central Turkey and description of a new taxon, Orbitoclypeus haymanaensis

Özcan, Ercan; Sirel, Ercüment; Altiner, Sevinq Ozkan; Çolakoglu, Sinan

doi:10.2113/47.4.339

Cited by 20 publications

(3 citation statements)

References 3 publications

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“…The annuli are usually moderately undulated; the growth pattern is of the varians type. Orbitoclypeus multiplicatus (Gümbel, 1870) haymanaensis Özcan et al, 2001-multiplicatus (Gümbel, 1870): Figs. 8.14-21, 9.10-13, 11, 13.1-3.…”

Section: Systematic Paleontologymentioning

confidence: 99%

Paleocene orthophragminids from the Lakadong Limestone, Mawmluh Quarry section, Meghalaya (Shillong, NE India): implications for the regional geology and paleobiogeography

Özcan

Pignatti

Pereira

et al. 2018

J. Micropalaeontol.

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Abstract. The late Paleocene orthophragminids, hitherto poorly known from the Himalayan foreland basins, are studied from the Lakadong Limestone in Meghalaya, northeastern India, in order to establish a systematic, biostratigraphic, and paleobiogeographical framework for them in the eastern Tethys. In the Mawmluh Quarry section (MQS) on the Shillong Plateau, to the southeast of Tibet, orthophragminids are associated with typical Paleocene orbitoidiform taxa endemic to the Indian subcontinent, i.e., Lakadongia Matsumaru & Jauhri (= Setia Ferràndez-Cañadell) and Orbitosiphon Rao, and various species of alveolinids, miscellaneids, and rotaliids, characterizing the Shallow Benthic Zones (SBZ) 3 and 4. The orthophragminids belong to two lineages of the genus Orbitoclypeus Silvestri: O. schopeni (Checchia-Rispoli) and O. multiplicatus (Gümbel), both well known from the peri-Mediterranean region and Europe (western Tethys). The latter species is identified here for the first time from the eastern Tethys. Previous records of the genus Discocyclina Gümbel from the Lakadong Limestone actually correspond to misidentified Orbitoclypeus; this implies that the late Paleocene orthophragminid assemblages from Meghalaya and eastern Tethys were less diverse than in the western Tethys. The lineage of Orbitoclypeus schopeni in the lower part of the Lakadong Limestone (SBZ 3) is identified as O. schopeni cf. ramaraoi based on the morphometry of a few specimens, whereas in the upper part (SBZ 4) it corresponds to a transitional development stage between O. schopeni ramaraoi and O. schopeni neumannae (with average Dmean values ranging between 192 and 199 µm). The embryon diameters of O. multiplicatus, recorded only in SBZ 4, range between 300 and 319 µm on average, corresponding to transitional development stages of O. multiplicatus haymanaensis and O. multiplicatus multiplicatus. Our data, along with a review of previous Paleocene and Eocene records from India and Pakistan, suggest that Orbitoclypeus is the only orthophragminid in the Paleocene of the eastern Tethys, whereas Discocyclina first appears in early Eocene times, being mainly represented by endemic taxa confined to the Indian subcontinent. Facies change in the MQS from a marine to continental setting within SBZ 4 corresponds to the oldest record from the Indian plate in the Paleogene, which may be linked to the flexural uplift of the passive margin of the Indian plate, marking the onset of the collision of the Indian and Eurasian plates.

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Section: Systematic Paleontologymentioning

confidence: 99%

Paleocene orthophragminids from the Lakadong Limestone, Mawmluh Quarry section, Meghalaya (Shillong, NE India): implications for the regional geology and paleobiogeography

Özcan

Pignatti

Pereira

et al. 2018

J. Micropalaeontol.

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“…Its stratigraphic position in previous literature has been controversial, described as Danian (Douvillé, 1922), Paleocene (Neumann, 1958) or Thanetian . The systematics of D. seunesi were also debated, since it has been assigned either to Discocyclina (Douvillé, 1922;Neumann, 1958;Samuel et al, 1972;Less, 1998;Ö zcan et al, 2001;Less et al, 2007) or Orbitoclypeus . The stratigraphic range of this species has recently been redefined by extending its upper range into the early Eocene based on its advanced members (D. seunesi karabuekensis) found in association with early, small Nummulites and orthophragminids characteristic of OZ 2 in the Safranbolu-Karabü k Basin, Turkey .…”

Section: Tethyan Orthophragminids Acrossmentioning

confidence: 99%

“…However, proof of the coincidence of this event to the CIE, and thus to the P/E boundary in the sense of Aubry et al (2007), is lacking. Morever, all orthophragminid taxa adopted in the establishment of the orthophragminid zonation were introduced from the northern Tethyan platforms (Less, 1998;Ö zcan et al, 2001;Less et al, 2007), and their geographical ranges and evolutionary relationships in the southern Tethyan platforms remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Orthophragminids (Foraminifera) Across the Paleocene-Eocene Transition From North Africa: Taxonomy, Biostratigraphy, and Paleobiogeographic Implications

Özcan

Scheibner

Boukhalfa

2014

The Journal of Foraminiferal Research

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The platform margin and slope deposits in Galala, Egypt, record a larger benthic foraminiferal turnover (LFT), previously proposed to coincide with the Paleocene-Eocene (P/E) boundary based on the negative carbon isotope excursion (CIE) consistent with the Paleocene-Eocene Thermal Maximum (PETM). The LFT in these deposits was established on the basis of supposed synchronous first appearances of such taxa as Alveolina, Nummulites, and Orbitolites at or around the P/E boundary, although the response of orthophragminids, assigned only to the genus Discocyclina, was not studied. The orthophragminids in the late Paleocene-early Eocene interval in some of these deposits (sections B3, D5, D6, and D8) are represented by species of Discocyclina Gümbel, Orbitoclypeus Silvestri, and Nemkovella Less, reported for the first time from the southern margin of the Tethys. The Thanetian orthophragminids consist of Orbitoclypeus multiplicatus, O. schopeni, Discocyclina seunesi, and D. tenuis, while assemblages in the early Eocene are characterized by Discocyclina archiaci, D. dispansa, Orbitoclypeus schopeni, and Nemkovella stockari, suggesting a significant change in composition through the sections. The assemblages below and above the P/E boundary, only recorded in sections B3 and D8, mark the orthophragminid zones OZ 1B and 3, respectively. The OZ 2, correlated to shallow benthic zones SBZ 5 and 6 in the basal part of the Eocene and recognized by the first appearance of asterocyclinids, nemkovellids, and some ribbed orbitoclypeid species in northern Tethyan platforms, was not found. This may suggest either a hiatus, recorded previously in section D8 based on calcareous plankton, across the P/E transition in section B3 or an artifact of sampling. Consequently, our data raise some doubts about the aforementioned compositional changes related to the LFT and P/E boundary. We discovered an advanced developmental stage of N. stockari (N. stockari bejaensis n. subsp.) from a new section in Tunisia. This subspecies seems to be a key taxon for the early Eocene of the southern Tethyan platforms and extends the geographic and stratigraphic range of the species. We conclude that orthophragminids at Galala bear a close resemblance to those in the northern Tethyan platforms, especially assemblages from Turkey.

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Reservoir potential of the Haymana Formation submarine-fan sandstones in the Haymana Basin of Turkey

Geçer

Büyükutku

Caetano

et al. 2019

J Petrol Explor Prod Technol

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Sedimentological and petrographic studies of the Haymana Formation sandstones identify a submarine fan in the Haymana Basin. This study is confined to outcrop samples from the submarine-fan sandstones (the L1, L2, and L3 sections) and focuses on documentation of the petrographic characteristics of and depositional controls on reservoir properties of the Haymana Formation sandstones. Analysis of the lithology, texture, sedimentary structure, and petrography of the outcrop samples allows separation of the Haymana Formation sandstones into three distinct lithofacies, A, B, and C. Lithofacies A sandstones exhibit medium-coarse grain sizes (0.4-0.6 mm), moderate-good sorting, and subrounded grains. Lithofacies B sandstones exhibit fine grain sizes (0.2 mm), moderate sorting, and subrounded-subangular grains. Lithofacies C sandstones exhibit very fine grain sizes (0.112 mm) and nonreservoir facies. The main aim of this study is to document the diagenetic history and reservoir quality of the Haymana Formation sandstones. Lithofacies A has the best permeability, ranging from 80 to 120 mD, which can be related to the large grain size, the presence of cross-bedding, small amount of authigenic clays or cements in the pore throats, and enlarged pore apertures. In contrast, Lithofacies B sandstones contain variable yet small pore and pore-throat sizes, which are affected by abundant pore-filling authigenic clays, small grain sizes, and no dissolution. The permeability of the Lithofacies B sandstone ranges from 16 to 35 mD, which is lower than that of the Lithofacies A sandstone. Additionally, the Lithofacies B sandstones have small median pore-throat sizes (mean = 1.52 μm) and low porosities (average 4-6%), and the Lithofacies A sandstones have large pore-throat sizes (mean = 2.06-3 μm) and high porosities (average 20-25%), with most pore throats (50% or more) ranging between 1 and 4 μm. According to these data, the Lithofacies A sandstones show good reservoir characterisation. To date, significant hydrocarbon deposits have not been discovered in the Haymana Formation sandstones, although intensive exploratory work towards this end has been carried out in the Haymana Basin. According to this study, the proximal sandstones of the submarine-fan complex of the Haymana Formation may contain high-potential reservoirs in the Haymana Basin. In the basin, hydrocarbon is sourced from deep zones and may be capped by the proximal part of the Haymana Formation sandstones. According to this study, the Lithofacies B sandstones of the Haymana Formation are not suitable as diagenetic traps for hydrocarbon exploration in the Haymana Basin. However, the Lithofacies A sandstones may be expected to have the highest exploration success.

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Late Paleocene Orthophragminae (Foraminifera) from the Haymana-Polatli Basin, central Turkey and description of a new taxon, Orbitoclypeus haymanaensis

Cited by 20 publications

References 3 publications

Paleocene orthophragminids from the Lakadong Limestone, Mawmluh Quarry section, Meghalaya (Shillong, NE India): implications for the regional geology and paleobiogeography

Paleocene orthophragminids from the Lakadong Limestone, Mawmluh Quarry section, Meghalaya (Shillong, NE India): implications for the regional geology and paleobiogeography

Orthophragminids (Foraminifera) Across the Paleocene-Eocene Transition From North Africa: Taxonomy, Biostratigraphy, and Paleobiogeographic Implications

Reservoir potential of the Haymana Formation submarine-fan sandstones in the Haymana Basin of Turkey

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