Continental island from the Upper Silurian (Ludfordian Stage) of Inner Mongolia: Implications for eustasy and paleogeography

Abstract

Research Article| October 01, 2001 Continental island from the Upper Silurian (Ludfordian Stage) of Inner Mongolia: Implications for eustasy and paleogeography Markes E. Johnson; Markes E. Johnson 1Department of Geosciences, Williams College, Williamstown, Massachusetts 01267, USA Search for other works by this author on: GSW Google Scholar Rong Jia-yu; Rong Jia-yu 2Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008, People's Republic of China Search for other works by this author on: GSW Google Scholar Wang Cheng-yuan; Wang Cheng-yuan 2Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008, People's Republic of China Search for other works by this author on: GSW Google Scholar Wang Ping Wang Ping 3Department of Geology, Chang'an University, Xi'an City 710000, People's Republic of China Search for other works by this author on: GSW Google Scholar Author and Article Information Markes E. Johnson 1Department of Geosciences, Williams College, Williamstown, Massachusetts 01267, USA Rong Jia-yu 2Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008, People's Republic of China Wang Cheng-yuan 2Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008, People's Republic of China Wang Ping 3Department of Geology, Chang'an University, Xi'an City 710000, People's Republic of China Publisher: Geological Society of America Received: 09 Feb 2001 Revision Received: 21 May 2001 Accepted: 04 Jun 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (10): 955–958. https://doi.org/10.1130/0091-7613(2001)029<0955:CIFTUS>2.0.CO;2 Article history Received: 09 Feb 2001 Revision Received: 21 May 2001 Accepted: 04 Jun 2001 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Markes E. Johnson, Rong Jia-yu, Wang Cheng-yuan, Wang Ping; Continental island from the Upper Silurian (Ludfordian Stage) of Inner Mongolia: Implications for eustasy and paleogeography. Geology 2001;; 29 (10): 955–958. doi: https://doi.org/10.1130/0091-7613(2001)029<0955:CIFTUS>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract An unconformity between the Silurian Xibiehe Formation and Ordovician igneous rocks marks the perimeter of a small paleoisland near Bater Obo in north-central Inner Mongolia, 180 km northwest of the provincial capital of Hohhot. The stratigraphic position of the lower part of the Xibiehe Formation is correlated by means of conodonts with the upper part of the Ancoradella ploeckensis Zone in the basal Ludfordian Stage (corresponds to mid-Ludlovian Epoch, ca. 421 Ma). Elongate in plan (610 m × 200 m), the exhumed diorite core rises 30 m above the lowest elevations of surrounding Silurian strata. Paleoshores along the principal axis of the inlier delineate contrasting facies. Robust stromatoporoids are in growth position within silty limestones, some directly encrusting the unconformity surface of the sheltered southeast margin. A basal conglomerate of diorite cobbles and boulders characterizes the high-energy northwest margin. The depositional constraints and timing of transgressive facies associated with this continental paleoisland have implications for the eustatic and paleogeographic history of the parent Sino-Korean plate. Burial of the island corresponds to the beginning of a global rise in sea level that peaked in late Ludlovian time. Our interpretation of windward and leeward facies requires an approximate 90° clockwise rotation of the parent plate to accommodate the dominant pattern of low-latitude trade winds and storms. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.