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Upper Cretaceous Bituminous Coal Deposits of the Olmos Formation, Maverick County, Texas

By
Robert W. Hook
Robert W. Hook
U.S. Geological Survey contract employee
,
Austin, Texas, U.S.A.
.
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Peter D. Warwick
Peter D. Warwick
U.S. Geological Survey
,
Reston, Virginia, U.S.A.
.
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John R. SanFilipo
John R. SanFilipo
U.S. Geological Survey
,
Reston, Virginia, U.S.A.
.
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Published:
January 01, 2011

Abstract

Near the Barents Sea coast in northern Timan, turbidites of probable Neoproterozoic age are intruded by pre-tectonic dolerites and a major suite of gabbros, granites and syenites (some nepheline bearing). Zircon ion microprobe dating of three plutons has yielded well-defined ages of 613–617 Ma. This alkaline igneous activity apparently represents a final phase of Vendian extensional magmatism prior to Timanian Orogeny. Previous work on late to post-orogenic calc-alkaline granites in the basement beneath the Pechora Basin, three hundred kilometres towards the SE, has yielded c. 550–560 Ma single zircon Pb-evaporation ages. These compositionally different intrusive suites are inferred to constrain the main phase of Timanian Orogeny to c. 610–560 Ma.

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Contents

AAPG Studies in Geology

Geologic Assessment of Coal in the Gulf of Mexico Coastal Plain

Peter D. Warwick
Peter D. Warwick
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Alexander K. Karlsen
Alexander K. Karlsen
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Matthew Merrill
Matthew Merrill
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Brett J. Valentine
Brett J. Valentine
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American Association of Petroleum Geologists
Volume
62
ISBN electronic:
9781629810256
Publication date:
January 01, 2011

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