Extending the stratigraphic range of Nummulites bormidiensis Tellini in the Neo-Tethys (Zagros basin, SE Iran) through biometry and calcareous nannofossil biostratigraphy

IF 1.3 4区地球科学 Q3 PALEONTOLOGY Micropaleontology Pub Date : 2023-01-01 DOI:10.47894/mpal.69.4.06

M. Hadi, Seyyed Khalil Forouzande, L. Consorti, M. Parandavar, M. Vahidinia

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Abstract

A biometrical study on four reticulate Nummulites populations from the lower part ofAsmari Formation of the Vazag section (Zagros zone) is carried out. The biostratigraphy obtained by studing the succession points to the Early Oligocene (Rupelian), indicating shallow benthic zones SBZ21 and SBZ22A by the occurrence of Operculina cf. complanata, Eulepidina formosoides, Nephrolepidina sp. The age assignment is calibrated with calcareous nannofossils biostratigraphy indicating the NP22-NP23 (=CNO2-CNO3) Zones.We have observed a stratigraphic trend related to Nummulites bormidiensis Tellini 1888 that results to be characterized by two populations composed of transitional Nummulites fichteli/bormidiensis with values of mean inner proloculus that exceeds by very little the boundary commonly established at 300 um. Such a populations, indicated as Nummulites ex interc. bormidiensis et fichteli, span through the lower Rupelianwhere classically just N. fichteli is reported so far. The stratigraphic distribution of Nummulites bormidiensisis and related transitional forms is here stretched to the Rupelian (SBZ21 and SBZ22A), encompassing older ages than previously recorded throughout the Neo-Tethys Ocean.

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通过生物计量学和钙质纳米化石生物地层学研究扩大了新特提斯(伊朗东南部扎格罗斯盆地)Nummulites bormidiensis Tellini的地层范围

对Vazag剖面(Zagros带)asmari组下部的4个网状Nummulites种群进行了生物统计学研究。通过演替研究得到的生物地层学指向早渐新世(鲁比利世)，由Operculina cf.complanata、Eulepidina formosoides、Nephrolepidina sp的出现确定了SBZ21和SBZ22A浅层底栖生物带。用钙质纳米化石生物地层学校正了年龄，确定了NP22-NP23 (=CNO2-CNO3)带。我们观察到一个与Nummulites bormidiensis Tellini 1888有关的地层趋势，其特征是两个由过渡性Nummulites fichteli/bormidiensis组成的种群，其平均内前位值仅超过通常在300 um建立的边界。这样的种群，表示为Nummulites ex intercbormiddiensis et fichteli，跨越rupelia下部，到目前为止，传统上只报道了N. fichteli。在这里，Nummulites bormidensis及其相关过渡形态的地层分布延伸到鲁比利期(SBZ21和SBZ22A)，比以前记录的整个新特提斯洋的年龄更大。

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来源期刊

Micropaleontology 地学-古生物学

CiteScore

3.20

自引率

6.70%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny. Owned by The Micropalaeontological Society, the scope of the journal is broad, demonstrating the application of microfossils to solving broad geoscience issues.