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Author:
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Category : Cartography
Languages : en
Pages : 70
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Book Description
Author:
Publisher:
ISBN:
Category : Cartography
Languages : en
Pages : 70
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Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 40
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Book Description
Author: L. E. Burns
Publisher:
ISBN:
Category : Colluvium
Languages : en
Pages : 256
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Book Description
Author: Alison B. Till
Publisher:
ISBN:
Category : Franciscan Complex (Calif.)
Languages : en
Pages : 394
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Book Description
Author: David A. Lindsey
Publisher:
ISBN:
Category : Coal
Languages : en
Pages : 428
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Book Description
Author: Paul Kibler Sims
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ISBN:
Category : Faults (Geology)
Languages : en
Pages : 268
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Book Description
The Early Proterozoic Michigamme Formation of northern Michigan was deposited in the southeastern part of the Animikie basin. The formation conformably overlies the Goodrich Quartzite and comprises three widespread members a lower member of thin-bedded shale, siltstone, and sandstone; the Bijiki Iron-formation Member; and an upper member of tur- biditic graywacke, siltstone, and mudstone and a few local members. The Goodrich Quartzite is interpreted as having been deposited in a tidally influenced shallow marine environ- ment. The lower member of the Michigamme is interpreted as having been deposited in a tidally influenced environment, the iron-formation member as having been deposited below wave base in somewhat deeper water, and the upper member as having been deposited in still deeper water with turbidity currents being a major depositional mechanism. Several lines of evidence including paleocurrents, paleo- geographic setting, and neodymium isotopes suggest that the graywacke of the southern part of the outcrop area was derived from the south (Early Proterozoic Wisconsin magmatic terranes, Archean miniplates, and older Early Proterozoic sedimentary units formed on the continental margin), and that the graywacke in the northern area was derived from an Archean terrane to the north. The tectonic model that best fits the available data is a northward-migrating foreland basin.
Author: Colin F. Williams
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ISBN:
Category : Argillite
Languages : en
Pages : 214
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Phosphatic concretions occur within diatomite in the upper part of the Miocene Monterey Formation near Lompoc, Calif. Absence of disruption of fine laminar bedding in the associated sediment by the concretions shows that they formed after complete compaction of the enclosing sediment.The concretions exhibit a strongly concentric color, chemical, and mineralogic zonation. Many of them are composed of a nucleus in which vivianite is the dominant mineral. Amorphous ferric phosphate, mitridatite, and francolite are the dominant phosphatic phases in successive layers toward the surface of the concretions. Cd and As contents increase tenfold from the nucleus outward, reaching a maximum of 2,000 ppm, whereas Ni content, with a maximum of 720 ppm, and Co content show the opposite trend. This mineralogy and elemental composition favor accretion under conditions of continuously increasing Eh and pH, during uplift into the fresh-ground-water zone of the terrestrial environment. Shale-normalized rare-earth-element patterns, however, suggest a marine source for the elements biogenic debris consisting of opal-A, organic matter, and carbonates of the enclosing sediment.
Author: E. A. Du Bray
Publisher:
ISBN:
Category : Cretaceous-Tertiary boundary
Languages : en
Pages : 116
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Book Description
Author: Helaine W. Markewich
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 414
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Book Description
Author: Gene L. LaBerge
Publisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 346
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Book Description
A reconnaissance study carried out in conjunction with regional geologic mapping.
