Oolitic ironstones and contrasting Ordovician and Jurassic paleogeography

Abstract

Research Article| October 01, 1985 Oolitic ironstones and contrasting Ordovician and Jurassic paleogeography Franklyn B. Van Houten Franklyn B. Van Houten 1Department of Geological and Geophysical Sciences, Princeton University, Princeton, New Jersey 08544 Search for other works by this author on: GSW Google Scholar Author and Article Information Franklyn B. Van Houten 1Department of Geological and Geophysical Sciences, Princeton University, Princeton, New Jersey 08544 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1985) 13 (10): 722–724. https://doi.org/10.1130/0091-7613(1985)13<722:OIACOA>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Franklyn B. Van Houten; Oolitic ironstones and contrasting Ordovician and Jurassic paleogeography. Geology 1985;; 13 (10): 722–724. doi: https://doi.org/10.1130/0091-7613(1985)13<722:OIACOA>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 Distribution of abundant Ordovician and Jurassic oolitic ironstones provides a test for current ideas about factors controlling their origin. These include warm climate and deep weathering, dispersed continents, and highstand of global sea level.Most of the Jurassic ironstones developed in middle northern latitudes on the unstable European part of assembled Laurasia at a time of low global sea level, mild moist climate, and abundant vegetation. Most of the Ordovician ironstones accumulated around the northwestern margin of assembled Gondwana and Armorica during highstand of sea level and an absence of land plants, and in high southern latitudes that supported an ice cap by the end of the period.These contrasts demonstrate that neither dispersed continents nor major highstand of sea level was a necessary factor. Moreover, requisite weathering in Ordovician time may have been induced by adequate soil-air CO2 pressure maintained by elevated atmospheric Pco2 in tne absence of land plants. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.