versión On-line ISSN 2007-2902
Rev. mex. cienc. geol vol.29 no.1 México abr. 2012
Microbiostratigraphy of the Lower Cretaceous strata from the Bararig Mountain, SE Iran
Microbioestratigrafía de los estratos del Cretácico Inferior de la Montaña Bararig, SE de Irán
Mahin Rami1, Mohammad Reza Vaziri2, Morteza Taherpour Khalil Abad3*, Seyed Abolfazl Hosseini4, Ivana Carevic5, and Mohsen Allameh6
1 Department of Geology, NorthTehran Branch, Islamic Azad University, Tehran, Iran.
2 Shahid Bahonar Universty, Kerman, Iran.
3 Department of Geology, Mashhad Branch, Islamic Azad University, Mashhad, Iran. Young Researchers Club, Mashhad Branch, Islamic Azad University.* email@example.com
4 Exploration Directorate, National Iranian Oil Company, Tehran, Iran.
5 Faculty of Geography, University of Belgrade, Studentski trg 3/3, 11000 Belgrade, Serbia.
6 Department of Geology, Mashhad Branch, Islamic Azad University, Mashhad, Iran.
Manuscript received: June 14, 2011
Corrected manuscript received: August 26, 2011
Manuscript accepted: September 2, 2011
The BarremianAptian sediments in the Bararig section (Southwest of Kuhbanan) consist of an alternation of marl and limestone. Thepalaeontological analysis led to identification of twenty seven taxa of benthic foraminifera and algae in the section studied. Diverse assemblages of benthic foraminifera and also the lowplanktonic/benthic (P/B) ratio show that the sedimentary environment in the study area was oxygenated and shallow.
Key words: microbiostratigraphy, palaeoecology, Lower Cretaceous, Bararig section, Kerman Province, Iran.
Los sedimentos del BarremianoAptiano en la sección Bararig section (al suroeste de Kuhbanan) consisten en una alternancia de margas y calizas. El análisis paleontológico permitió la identificación de 27 taxa de foraminíferos bentónicos y algas en la sección estudidad. Diversas asociaciones de foraminíferos bentónicos y la baja relación de planctónicos/bentónicos (P/B) indica que el ambiente sedimentario en el área de estudio fue oxigenado y somero.
Palabras clave: microbiostratigrafía, paleoecología, Cretácico Inferior, sección Bararig, Provincia Kerman, Irán.
INTRODUCTION AND GEOLOGICAL SETTING
Lower Cretaceous sediments in some areas of the Kerman region, Iran, such as Baghin, EkhtiyarAbad and Kuhbanan, are marlstones and limestones with intercalations of marl. The first studies in the Kerman region were done by Pilgrim (1924). Huckreide et al. (1962) comprehensively studied the geology of the Kerman region and delineated the Cretaceous palaeogeography of this region. Cretaceous foraminifera of the Kerman region have been studied by Mahanipoor (2003), and Arab (2003, 2004, 2005). Vaziri (2003) studied the distribution of foraminifera and the paleoecology of the Cenomanian deposits. Hosseinipour et al. (2003), Arab et al. (2004, 2005) and Vaziri et al. (2006) studied the AlbianCenomanian deposits in two stratigraphic sections (Henouj and Chenaroieh) in the western part of the Kerman region, and, eventually, biostratigraphic and paleoecologic studies were done by Ahmadi et al. (2010). Cretaceous outcrops in the Kerman Province are shown in the Figure 1.
This paper presents the results of a palaeoecological study based on the microfossil content of samples collected in the Lower Cretaceous Bararig section, along the ZarandKuhbananDeh Ali road, Karman province (Figure 2).
Structural units of Iran
units to be recognized in the studied area, separated by ophiolitebearing sutures. Other criteria such as structural style, the age and intensity of deformation, and the age and nature of magmatism are used to subdivide these major zones into smaller elements. The three major units and their main constituents are as follows: 1) the southern unit, with a crystalline basement consolidated in Precambrian time, platformtype Paleozoic sediments and younger deposits. This unit comprises the Zagros fold belt; 2) the central unit, interpreted as an assemblage of marginal Gondwana fragments, originally united with the main continent and separated from the North (Eurasian) continent during the Paleozoic. In Mesozoic times, these fragments were detached from Gondwana and attached to Eurasia. During the Late Cretaceous they rejoined the Gondwanic AfroArabia. This unit comprises Central Iran and the Alborz; 3) the northern unit, markedly separated from the central unit by ophiolites of the North Iran suture. The continental crust includes remnants of more or less cratonized, former (Paleozoic) oceanic crust possibly that of the Paleotethys. The northern unit represents a marginal strip of the Hercynian realm of Central Asia, broadly overlapped by the Alpine realm. It was deformed and largely consolidated by strong Early Cimmerian and Late Alpine folding (Stocklin, 1968). The Northern Unit comprises the South Caspian Depression and the KopetDagh Range (Figure 3).
A brief comparison of Cretaceous deposits in different parts of Iran
The most complete Cretaceous sections in North Iran are found in the KopetDagh range on the border of Iran and Turkmenistan. The rocks consist of marine shales, marls, limestones and sandstones. The sequence reaches a thickness of more than 3000 m and seems to represent all major parts of the Lower Cretaceous strata (AfsharHarb, 1994). In the Alborz mountains and farther south, Cretaceous limestones and marls are widely distributed but the sections are less complete. Elsewhere, unfossiliferous red clastic basal beds, which in the RavarDarband area northern Kerman province, contain considerable amounts of gypsum, frequently initiate the Cretaceous sequence and are followed by limestones and marls of different ages. The oldest marine beds are Orbitolinabearing limestones (TizKuh Formation of the Alborz, "Orbitolina limestone" in general), which are conventionally regarded as AptianAlbian but may include stages as old as Barremian and as young as Cenomanian. An unusual shale facies reaching great thickness and containing very rare cephalopods represents the BarremianAlbian in the Biabanak area of Central Iran (Stocklin and Setudehnia, 1991).
With the exception of the Kopet Dagh area mentioned above, detailed stratigraphic studies of the Upper Cretaceous deposits have been carried out only in a few limited areas such as the central Alborz, Tehran, Jandaq, Esfahan and Kerman areas. Detrital limestones, reef limestones, marls and shales prevail. However, the marine sequences are frequently interrupted by conglomerates, red beds, sedimentary gaps and unconformities and the sections vary in detail over short distances, reflecting the unstable conditions of the sedimentary environment during the initial phases of the Alpine orogeny. This and considerable disagreement between interpretations of different authors regarding the stratigraphic significance of the faunas has so far made reliable correlation over any greater distance difficult and a consistent stratigraphic subdivision of the Upper Cretaceous has yet to be established. The Stratigraphic Terminological Committee (STC) of Iran has recommended not introducing any formal stratigraphic names for the Upper Cretaceous strata of the Alborz and of central and eastern Iran until more regional information becomes available to clarify the situation, in compliance with this recommendation (Stocklin and Setudehnia, 1991).
Stratigraphy of the Bararig section
The Bararig section is situated in the NWSE striking Bararig mountains, at approximately 60 km southwest of Kuhbanan city (Kerman Province), and is accessible by the ZarandKuhbananDeh Ali road (Figure 2). The section is 190 m thick and is composed of two lithological associations, marls and limestones, which were deposited alternatively (Figure 4). The section from the lower to the upper part is as follows: green marls (90 m), gray limestones with intercalation of marls (40 m), light green marls (25 m) and gray, thickbedded limestones (35 m). The mentioned units contain ostracods, benthic foraminifera and macrofossils. In order to conduct palaeontological studies, samples from marls and limestones were collected. Due to lack offoraminifera in the marly layers, thinsections of limestoneshave been made. The stratigraphic column and the rangechart of benthic foraminifers are shown in Figure 5.
MATERIALS AND METHODS
This paper is based on the study of the Bararig section along the ZarandKuhbananDeh Ali road. The BarremianAptian succession was measured and sampled. Microfossil content of the samples was studied in 37 thin sections with an optical microscope. These allowed the identification of the vertical foraminiferal distribution and establishment of two regional biozones. The palaeoecological study determined three benthic foraminiferal groups. All rock samples and thin sections are housed in the Department of Geology, Shahid Bahonar University of Kerman.
The taxonomic determination of the foraminifers is based on the latest changes in the foraminiferal classifications: Loeblich and Tappan (1988, 1992) and Kaminski (2004), and takes into account the following works: Jones and Charnock (1985), Koutsoukos et al. (1990), Baud et al. (1994), Cherchi and Schroeder (1999), Yilmaz (1999), Granier et al. (2003), Masse et al. (2004, 2009).
Cylindroporella sp. cf. Cylindroporella sugdeni Elliott, 1957
Description. Obliquetransversal section shows a cylindrical thallus, with primary branches connecting to the main axis with a short peduncle. The inner diameter is about 0.17 mm; whereas it shows an outer diameter of approximately 0.55 mm. Primary laterals are followed by large spherical gamete production. The secondary branches arise from the sterile primary branches. It presents a calcified sheath composed of calcite covering the strikethrough.
Total range. Hauterivian Aptian.
Occurrence. S45, S47 (see sample position in Figure 5).
Stratigraphic distribution. HauterivianAptian of Switzerland, Portugal, France, and Aptian of Iran.
Nautiloculina oolithica Mohler, 1938
Description. Longitudinal section shows a lenticular shape and planispiral coil, which is involute. Proloculus is globular and followed by three small chambers. Chambers increase gradually in size. Wall agglutinated, microgranular and single layered.
Total range. OxfordianAptian.
Occurrence. S46, S47, S57, S59.
Stratigraphic distribution. Aptian of Iran and Late OxfordianBerriasian of Ukraine.
Marssonella turris d'Orbigny, 1840
Description. Subaxial section shows biserial stage of a trochospiral. Diameter of chambers increases rapidly and the terminal chamber becomes flattened. Wall agglutinated with organic lining in calcareous particles.
Total range. Early to Late Cretaceous.
Occurrence. S31, S37, S39, S41, S49, S53, S56, S57, S59.
Stratigraphic distribution. Cosmopolitan in the Early to Late Cretaceous. Aptian of Iran.
Novalesia angulosa Magniez, 1974
Description. Axial section represents biserial stage of coiling with seven rows of chambers. Radial beams are not clear, wall agglutinated with relict of interiomarginal slit aperture.
Total range. Late Aptian to Albian.
Occurrence. S31, S37, S39, S41, S44, S55, S56, S57, S59, S72, S73, S74.
Stratigraphic distribution. Late Aptianearly Albian of Spain and France. Albian of Croatia. Aptian of Iran.
Charentia cuvillieri Neumann, 1965
Description. Transversal section shows planispirally enrolled test with biumbonate to lenticular shape. The last chambers have tendency to uncoil. Laterally compressed and periphery nearly rounded. Wall finely agglutinated.
Total range. HauterivianCenomanian.
Occurrence. S39, S41, S43, S44, S46, S47, S49, S51, S53, S55, S57, S59, S70, S72, S73, S74.
Stratigraphic distribution. Upper BarremianCenomanian of France, Spain, Crimea, Texas and Egypt. Aptian of Iran.
Pseudolituonella recheli Marie, 1955
Description. Test conical elongate. Early portion with a short trochospiral stage in the type species but more elongate in geologically younger species, later stage with broad and low uniserial chambers. The wall is calcareous, microgranular, imperforate and single layered.
Range. In this study, the late Aptian is considered as the age of this taxon in the studied section.
Occurrence. S31, S37, S39, S46, S49, S51, S55, S57, S59, S70, S72, S73, S74.
Stratigraphic distribution. CenomanianCampanian of France, Spain, Turkey. Aptian of Iran. Lutetian of Libya.
Vercorsella sp. cf. Vercorsella scarsellai De Castro, 1963
Description. Axial section reveals a small, elongate and conical test. Apical angle about 20°. Initial trochospiral stage consists of a rounded protoconch, a small deuteroconch, and one chamber, followed by a biserial stage with up to eight chambers, slightly compressed parallel to the plane.
Total range. Barremian to Albian.
Occurrence. S31, S35, S37, S39, S41, S43, S46, S47, S49, S51, S53, S55, S56, S57, S59, S70, S72, S73, S74.
Stratigraphic distribution. Early HauterivianBedoulian of France and Italy. Aptian of Iran.
Orbitolina (Mesorbitolina) cf. Orbitolina (Mesorbitolina) texana Roemer, 1849
Description. The embryonic apparatus of macrospheric forms, which is very important for an exact determination, is preserved as well and is composed of protoconch, deuteroconch, and sub embryonic zone. It is located on the top of the specimen. The thickness of protoconch is about 0.11 mm and embryonic apparatus is about 0.25 mm.
Total range. Late AptianEarly Albian.
Occurrence. S31, S33, S35, S37, S39, S40, S41, S43, S44, S46, S47, S49, S51, S53, S55, S56, S57, S59, S70, S70, S72, S73, S74.
Stratigraphic distribution. AlbianEarly Cenomanian of USA, Italy, Spain, China, Tibet and Indian. Aptian of Iran.
cf. Mayncina bulgarica Laug, Peybernès and Rey, 1980
Description. Equatorial section shows numerous chambers, about ten chambers per whorl, in a planispiral coiling. Chambers arrangement reveals height increase and a tendency to uncoil of the last two or three chambers. The wall is finely agglutinated.
Total range. Late HauterivianAptian.
Occurrence. S37, S39, S70.
Stratigraphic distribution. Cenomanian of France. Aptian of Iran. TithonianBarremian of Ukraine.
Pseudocyclammina cf. Pseudocyclammina lituus Yokoyama, 1890
Description. Subequatorial section shows planispirally enrolled, the early stage may be streptospiral and represtrata from the Bararig Mountain SE Iran 69 sents uncoiling later. Wall coarsely agglutinated with sub epidermal network.
Total range. OxfordianAptian.
Occurrence. S31, S33, S35, S37, S41, S43, S46, S47, S49, S51, S53, S55, S73, S74.
Stratigraphic distribution. Early JurassicLate Cretaceous of Morroco, Libya, France, Italy, Poland, Mexico and Ukraine. Aptian of Iran.
Rumanoloculina pseudominima Bartenstein and Kovatcheva, 1982
Description. Transversal sections show the typical "Y" and somewhat loose mode of chamber arrangement and subacute periphery of the test.
Total range. BerriasianAlbian.
Occurrence. S31, S33, S37, S39, S40, S41, S44, S46, S49, S51, S53, S55, S57, S59, S70, S72, S73, S74.
Stratigraphic distribution. Late Cretaceous of Poland. Berriasian and Aptian of Iran.
Derventina filipescui Neagu, 1968
Description. Axial section shows quinqueloculine arrangement in the early stage, becomes later planispriral. Wall calcareous imperforate.
Total range. Late BarremianEarly Aptian.
Occurrence. S41, S42, S43, S44, S45.
Stratigraphic distribution. Barremian of Romania. Aptian of Iran.
Istriloculina sp. cf. Istriloculina alimanensis Neagu, 1984
Description. The sample shows globular shape, with different coiling, quinqueloculine in the early stage, then triloculine to pseudotriloculine. Wall calcareous imperforate.
Total range. Late BarremianEarly Aptian.
Occurrence. S33, S57, S59.
Stratigraphic distribution. Late BarremianEarly Aptian of Iran and Poland.
Montseciella arabica Henson, 1948
Description. Subaxial section shows horizontal subepidermal plates in the marginal zone. The central zone exhibits thin, vermicular partitions forming a labyrinthic structure and bordering relatively spacious hollows.
Total range. BarremianAptian
Occurrence. S40, S53, S59.
Stratigraphic distribution. BarremianAptian of Romania and Iran.
IDENTIFIED BIOZONES IN THE BARARIG STRATIGRAPHIC SECTION
According to the studies of thinsections and identified taxa, two regional biozones are determined and described as follow:
Montseciella arabica Range Zone
Biostratigraphic interval represented by the total range of Montseciella arabica. This biozone is located in the middle part of the section and suggests a BarremianAptian age.
Orbitolina (Mesorbitolina) texanaNezzazatinella picardi Assemblage Zone
This assemblage zone contains Praechrysalidina sp., Marssonella turris, Minouxia sp., Novalesia angulosa, Rumanoloculinapseudominima, Haplophragmmoides sp., Vercorsella cf. Vercorsella scarsellai, cf. Mayncina bulgarica, and Charentia cuvillieri. The mentioned biozone is defined by the first appearance of Orbitolina (Mesorbitolina) texana taxon and the overthrow of Nezzazatinella picardi taxon; it is found in the lower upper limestones of the studied section and shows the Aptian age for these deposits.
The most abundant foraminifera in the studied section are orbitolinids represented by Pseudotextulariella, Orbitolina (Mesorbitolina), Pseudolituonella, miliolids and Pseudocyclammina. Paleoecological studies show that, there are three groups ofbenthic foraminifera associations in the Bararig section, whereas pelagic foraminifera are missing: 1) Epifaunal genera: Charentia, Rzehakina, Lenticulina, Glomospira, Nezzazata Glomospirella, Nezzazatinella, Nutiloculina, Happlophragmoides, Trochamminoides, Rumanoloculina, Istriloculina, Ophthalmidium, Pseudocyclammina. 2) seminfaunal genera: Orbitolina (Mesorbitolina) and Orbitolina. 3) Infaunal genus: Pseudolituonella, Pseudotextulariella, Praechrysalidina, Minouxia, Marssonella, Bolivinopsis, Novalesia (Vaziri, 2003).
Epifaunal/infaunal ratio of benthic foraminifera is shown in the Figure 8. According to the thinsections, epifaunal and semiinfaunal foraminifera make 94.58% of the total percentage of foraminifers in the Berarig section and only 5.42% of foraminifers in this section belong to infaunal forms. It is clear that epifaunal foraminifers are unstable in environments with low amount of oxygen but the infaunal foraminifers are stable in such conditions (Lamolda, 1982; Hart, 1985) therefore, the abundance of epifaunal foraminifers indicates an environment rich in oxygen. Meanwhile, the association of larger benthic foraminifera (such as orbitolinids) with algae shows that the environment is shallow and situated within the photic zone. The available palaeoecological data on miliolids indicates a preference for warm, shallowwater and tolerance between 18 to 36% fluctuations in salinity.
Foraminiferal morphogroups and P/B ratio in the Bararig stratigraphic section
Each microhabitat category has distinct morphological characteristics. Epifaunal taxa are typical with planoconvex or biconvex cross sections, with trochospiral coiling and with large pores absent or found on only one side. Shallow infaunal taxa are uniserially, triserially, or even planispirally coiled with surface ornamentation present on a number of taxa. The intermediate infaunal taxa are distinguishable with rounded peripheries, with pores over the entire test and with planispiral coiling. The deep infaunal taxa are typical, with general, planispiral or triserial coiling of cylindrical or ovate shaped tests (Corliss, 1991). Although several fluctuations occurred in the generally low planktonic/benthic (P/B) ratio found in the lower limestones, benthic forms are dominating and in 47/06 represent 100% of the whole assemblage. In the upper limestones the rate of oscillation decreased (77/14 to 100%) (see Figures 9 and 10).
DISCUSSION AND CONCLUSIONS
BarremianAptian sediments of the Bararig mountain have all the characteristics of shallowwater deposits. The Urgonian succession consists of two depositional sequences characterized by marls and limestones. According to the foraminiferal assemblages found in the Bararig stratigraphic section and their comparison with stratigraphical sections in other parts of the world (specifically Europe) (LupertoSinni and Masse, 1986; Mancinelli et al., 2003; LupertoSinni, 1979), a BarremianAptian age is suggested for this stratigraphic section.
Also, according to the studies of thinsections and identified taxa two regional biozones are described: 1) Montseciella arabica Range Zone, and 2) Orbitolina (Mesorbitolina) texanaNezzazatinella picardi Assemblage Zone. The abundance of larger foraminifera indicates good oxygenation of the environment (Kaiho and Hasegawa, 1994). Furthermore, because of the high amount of benthic foraminifera and the low P/B (planktonic/benthic) ratio in the studied section, a low water depth for the environment also is suggested. This is confirmed by the presence of epifaunal and infaunal foraminifers, which are found together in shallow environments (Corliss and Chen, 1988) and also by the presence of algae, also living in shallow, high light, and well aerated environments (Flugel, 1982).
The authors would like to thank Mohammad Javad Hasani, Ahmad Arab, Hamed Ameri, Maryam Taheri, Shohreh Jaber and Maryam Derisi for their contributions in field sampling. Helpful comments by the reviewers, Prof. Dr. Seyed Hamid Vaziri (Department of Geology, Faculty of Basic Sciences, Islamic Azad UniversityNorth Tehran Branch, Tehran, Iran) and Prof. Dr. Josef Michalik (SAS Geological Institute, Bratislava, Slovakia) are acknowledged. Review of the English by Hasmik Asmaryan (Ecocenter NAS RA) is gratefully acknowledged.
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