Late Devonian facies variety in Iran: volcanism as a possible trigger of the environmental perturbation near the Frasnian-Famennian boundary

• Autorzy: Mahmudy Gharaie M. H. , Matsumoto R. , Kakuwa Y. , Milroy P. G.
• Języki publikacji: EN

Abstrakty

EN

Upper Devonian successions surrounding the Frasnian-Famennian (F-F) boundary in Iran consist of mixed carbonate/silisiclastic deposits. The successions are characterized by conspicuous ferruginous limestones, clay-rich units, black shales, and mafic volcanic rocks that provide important insights into palaeoenvironmental conditions during this interval of Earth’s history. An increase of kaolinite/illite ratio in clays associated with the F-F boundary suggests that increased chemical weathering was facilitated by warm and humid climatic conditions. Distinctive ferruginous-oolite deposits overlying the crucial Frasnian-Famennian boundary interval indicate a high supply rate of Fe-bearing clay originated during enhanced weathering under such climatic conditions. Black shales associated with the F-F boundary are interpreted to be the result of a high primary productivity caused by an increased influx of land-derived nutrients and regional volcanic activity. Widespread rift-related, basaltic activity along eastern Laurussia and northern Gondwana during the mid-Late Devonian is believed to have contribution to this global warming surrounding the F-F boundary.

Słowa kluczowe

EN

Frasnian-Famennian boundary; Iran; black shales; ironstone; greenhouse; volcanism

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2004
• Tom: Vol. 48, No 4
• Strony: 323--332
• Opis fizyczny: Bibliogr. 88 poz., rys.

Twórcy

autor

Mahmudy Gharaie M. H.

• Department of Earth and Planetary Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo

autor

Matsumoto R.

• Department of Earth and Planetary Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo

autor

Kakuwa Y.

• Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan

autor

Milroy P. G.

• Badley Ashton and Associates Ltd., Horncastle, Lincolnshire, UK

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