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The AAPG/Datapages Combined Publications Database

Showing 33,873 Results. Searched 197,348 documents.

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Early Diagenetic Glauconitization of Feldspar Grains in a Middle Proterozoic Tidal-Flat Complex: ABSTRACT

Asru K. Chaudhuri

AAPG Bulletin

.... Petrographic studies reveal two phases of glauconitization. The major phase, affecting detrital grains, is early diagenetic and is almost...

1980

Paleotopography's Influence on Porosity Distribution in Lansing-Kansas City "E" Zone, Hitchcock County, Nebraska: ABSTRACT

Martin K. Dubois

AAPG Bulletin

... phase of a complex marine-nonmarine sedimentary cycle. The packstones and grainstones are best developed on ancient positive seafloor features (15...

1980

Atchafalaya Delta--Louisiana's New Prograding Coast: ABSTRACT

Ivor Ll. Van Heerden, Harry H. Roberts

AAPG Bulletin

... prompted silt and clay deposition in Atchafalaya Bay and initiated the subaqueous phase of delta building. This development stage continued until...

1980

Petrology and Geochemistry of Peralkaline Volcanics of Sierra Campana, Chihuahua, Mexico: ABSTRACT

Richard K. Spruill

AAPG Bulletin

...-rich basal unit that grades upward into a blue crystal-poor phase containing clumps (lapilli) of sanidine (Or40) plus quartz phenocrysts. Distinctive...

1981

Novel Approach to Eh-pH Diagrams and Their Relation to Uranium In-Situ Leaching: ABSTRACT

John E. Oddo, John A. S. Adams, M. B. Thompson

AAPG Bulletin

... (as in in-situ leaching), it seems more plausible to assume a solid phase in solution at various Eh-pH conditions and allow the aqueous species the freedom...

1981

Recognition of Sand Body Depositional Environments: Limitations of Fourier Analysis and New Approach to Grain-Shape Analysis: ABSTRACT

James M. Parks

AAPG Bulletin

... phase angles. Two types of errors can occur: (1) dissimilar shapes can produce similar sets of amplitudes, and (2) similar (but not identical) shapes...

1981

Eustatic Control of Distribution of Lower Upper Cretaceous Coal Beds in Utah: Application in Coal Exploration: ABSTRACT

Thomas A. Ryer

AAPG Bulletin

... cycle. Rocks deposited during the transgressive phase of the cycle generally contain only thin beds of high-ash and high-sulfur coal that are of little...

1981

Isotope Geochemistry of Calcite and Clay Minerals in Volcanogenic Rocks, Great Valley Sequence, Northern California: Implications for Organic Diagenesis: ABSTRACT

Robert K. Suchecki

AAPG Bulletin

... and conversion of smect te to a 10A clay-mineral phase. Theoretical considerations indicate that a shallow burial phase of predominantly pore-filling...

1981

Paleogeographic Setting and Depositional Environments of Santa Margarita Formation, Ventura County, California: ABSTRACT

Devin R. Thor

AAPG Bulletin

... the transgressive phase. Increased rate of sedimentation produced a seaward progradational sequence or regressive phase. Rocks that represent...

1981

Transitional Desmoinesian to Missourian Cyclic Deposits on Opposite Shores of Arkoma Seaway: ABSTRACT

Allan P. Bennison

AAPG Bulletin

... thin and developed near tops and bottoms of shale sequences. Seaway deposits are much more variable. High sea-level phase is characterized...

1981

Barra Nova Salt Domes Province, Espirito Santo Basin, Offshore Brazil: ABSTRACT

P. T. Araripe, M. Saito, S. Shimabukuro, C. H. R. Cunha, R. O. Kehle

AAPG Bulletin

..., they reached the extrusion/collapsing phase which extended to the Holocene with the salt domes being dissolved on the present sea floor. One...

1982

Fan-Delta and Lacustrine Margin Sedimentation, Chinle Formation (Upper Triassic), Canyonlands National Park, Utah: ABSTRACT

Ronald C. Blakey, Richard Gubitosa

AAPG Bulletin

... streams waned before reaching the lakes, and algal and evaporatic mud flats formed on broad lacustrine perimeters. The high fluvial output phase...

1982

Sedimentologic Aspects, Mannville Group, Southwestern Alberta: ABSTRACT

David P. James

AAPG Bulletin

..., and diagenesis of southern Alberta is now possible. Three major phases of sedimentation are recognized. The first phase of Mannville sedimentation commenced...

1982

Utilization of Interactive Computer Graphics to Solve Complex Geological Problems--A Case Study: ABSTRACT

Louis J. Klahn, Jr., John H. Doveton

AAPG Bulletin

... this phase. The next phase was to perform an in-depth, detailed analysis to discover more about the key characteristics of the formation. Most...

1982

Depositional Styles of Notikewan Member (Upper Gates Equivalent), Fort St. John Group, Northeastern British Columbia: ABSTRACT

Dale A. Leckie

AAPG Bulletin

... lag is a 5 to 10 m fining-upward transgressive phase of interbedded sandstone or conglomerate and shale. The sandstones are hummocky cross-stratified...

1982

Sedimentary-Exhalative Pb-Zn Deposition, Grum Deposit, Anvil Range, Yukon, Canada: ABSTRACT

J. S. Modene, W. C. Shanks, III, D. S. Jennings

AAPG Bulletin

... batholith. The Grum deposit consists of two sulfide horizons which were isoclinally folded into a first phase fold closure that was subsequently refolded...

1982

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