The Hushoot Shiveetiin gol section (Baruunhuurai Terrane, Mongolia): sedimentology and facies from a Late Devonian islan
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ORIGINAL PAPER
The Hushoot Shiveetiin gol section (Baruunhuurai Terrane, Mongolia): sedimentology and facies from a Late Devonian island arc setting A. Munkhjargal 1,2 & P. Königshof 2 & S. Hartenfels 3 & U. Jansen 2 & A. Nazik 4 & S. K. Carmichael 5 & J. A. Waters 5 & S. Gonchigdorj 1 & C. Crônier 6 & A. Yarinpil 7 & O. Paschall 5 & A. Dombrowski 5 Received: 29 April 2020 / Revised: 26 June 2020 / Accepted: 21 July 2020 # The Author(s) 2020
Abstract A Late Devonian to (?)Early Mississippian section at Hushoot Shiveetiin gol in the Baruunhuurai Terrane of the Central Asian Orogenic Belt (CAOB) exposes large parts of cyclic Famennian shallow-water siliciclastic shelf deposits composed of siltstones, sandstones, shales, volcaniclastics, and intercalated autochthonous carbonates. The youngest part of the section, possibly Early Mississippian, is represented by arkosic sandstones with large plant remains. The facies reflects a range from shallow-intertidal to outer ramp settings. In terms of conodont stratigraphy, the Hushoot Shiveetiin gol section ranges from the Palmatolepis minuta minuta Biozone to at least the Palmatolepis rugosa trachytera Biozone. Hiatuses of several conodont biozones occur due to the facies setting (erosion and reworked sediments which are recognized by reworked conodonts) rather than thrusting or folding. The environmental setting was characterized by coeval subaerial volcanism resulting in numerous pyroclastic deposits. The depositional environments and intense volcanic activity at the Hushoot Shiveetiin gol section limited the stratigraphic distribution, abundance, and diversity of many elements of the fauna such as brachiopods. Ostracods were very abundant and diverse through many parts of the section. Although limited in stratigraphic distribution, the crinoid fauna is the most diverse Palaeozoic fauna collected from Mongolia to date and supports the hypothesis that the CAOB was a biodiversity hotspot in the aftermath of the Frasnian–Famennian extinction event. Keywords Central Asian OrogenicBelt(CAOB) . Facies . Biostratigraphy . Volcanism . Biodiversityhotspot . HangenbergCrisis This is a contribution to a special series on “The Central Asian Orogenic Belt (CAOB) during Late Devonian: new insights from southern Mongolia”. * A. Munkhjargal [email protected] 1
Mongolian University of Science and Technology 8th khoroo, Baga toiruu 34, Sukhbaatar District, Ulaanbaatar 14191, Mongolia
2
Senckenberg Research Institute and Natural History Museum, Senckenberganlage 25, 60325 Frankfurt, Germany
3
Institute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, 50674 Cologne, Germany
4
Faculty of Engineering Department, Cukurova University, Mithat Özsan Bulvari, TR-01330 Adana, Turkey
5
Department of Geological and Environmental Sciences, Appalachian State University, 572 Rivers St., Boone, NC 28608, USA
6
Université de Lille, CNRS, UMR 8198 Évo-Éco-Paléo, F-59000 Lille, France
7
Section of Geology and Paleontology, Natural History Museum, P.O. Box 46/5
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