Phanerozoic oolitic ironstones; geologic record and facies model

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Authors:Van Houten, Franklyn B.; Bhattacharyya, Deba P.
Author Affiliations:Primary:
Princeton Univ., Dep. Geol. and Geophys. Sci., Princeton, NJ, United States
Other:
Wash. Univ., Dep. Earth and Planet. Sci., United States
Volume Title:Annual Review of Earth and Planetary Sciences
Source:Annual Review of Earth and Planetary Sciences, Vol.10, p.441-457. Publisher: Annual Reviews, Palo Alto, CA, United States. ISSN: 0084-6597
Publication Date:1982
Note:In English. 82 refs.; illus.
Summary:Major development of Phanerozoic oolitic ironstones was fostered by episodes of mild climate, widespread transgression of the continents, and tectonic stability or waning orogeny accompanied by decreased detrital influx into shallow seas, flooding cratonic margins, intracratonic basins, and foredeeps. Almost all the ferric oxide-chamosite oolites accumulated during Early Ordovician - Late Devonian and Early Jurassic - Middle Cainozoic time, in long well-documented episodes of mild climate and extensive transgression. Within the conducive regional framework, formation of oolitic ironstones was favoured by a combination of specific physico-chemical conditions associated most commonly with low- energy deltas and strandlines with an embayed or lagoonal coast. Each ironstone and its associated ferruginous hardground and lag deposit developed most rapidly at the lithofacies discordance between successive shoaling-upward sequences. [R.A.H.]
Subjects:Chemically precipitated rocks; Distribution; Genesis; Ironstone; Lithofacies; Oolitic texture; Phanerozoic; Sedimentary petrology; Sedimentary rocks; Textures; Secondary petrology
Abstract Numbers:83M/0878
Record ID:1982060887
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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