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The AAPG/Datapages Combined Publications Database
Showing 440 Results. Searched 195,405 documents.
Affinity of Lucianorhabdus and Species of Tetralithus in Late Cretaceous Gulf Coast Samples
Frank H. Wind
GCAGS Transactions
... by prominant sutures. High birefringence characterizes both genera. Both genera first appeared during the mid-Cretaceous time and persisted to the close...
1975
Petrology and Geochemistry of the Sempah Volcanic Complex : Peninsular Malaysia
Azman A Ghani, Navpreet Singh
Geological Society of Malaysia (GSM)
... in the orthopyroxene dacite is characterized by high relief, low birefringence in sections of normal thickness and parallel extinction. Liew (1977...
2005
Integration of Microseismic With Rock Properties From Multi-Component Seismic Data, Mississippi Lime Play, North-Central Oklahoma
Scott W. Singleton, Shihong Chi, Crystal Lapaire, Lisa Sanford, Paul Constance
Unconventional Resources Technology Conference (URTEC)
... was calculated using an HTI assumption which leaves a significant amount of birefringence unaccounted for. Figure 6: PS transverse energy volume...
2015
Clay-Pellet Conglomerates at Hobart Butte, Lane County, Oregon
Victor T. Allen, Robert L. Nichols
Journal of Sedimentary Research (SEPM)
... mineral with low to moderate birefringence and wavy extinction, that may be montmorillonite, occurs as wisps in the matrix, but montmorillonite FIG. 1...
1945
The Keystone of the Canadian Rockies
H. H. Beach
CSPG Special Publications
.... In certain lights, the birefringence of the crystals creates plays of color reminiscent of tropical butterfly wings. It is no exaggeration to say...
1954
The Petrology of a Specimen of the Perry Farm Shale
W. D. Keller, Chuen Pu Ting
Journal of Sedimentary Research (SEPM)
... as the mineral in the particles with low birefringence and indices of refraction about 1.565. Colorless mineral shreds with indices 1.560-1.585...
1950
Petroleum Geochemistry and Mudstone Diagenesis of the Woodford Shale, Anadarko Basin, USA An Integrated Approach
Christopher D. Laughrey, Peter Purrazzella, K.N. Hooghan
Unconventional Resources Technology Conference (URTEC)
... XRD quartz content, lower matrix birefringence in thin section, and relatively low XRD clay mineral content (Figure 2). Table 1 provides a breakdown...
2017
Trends of Sedimentation in Giridih Basin, Bihar, India
C. Narasimha Rao
Journal of Sedimentary Research (SEPM)
.... Chlorite--Pale yellowish-green, cleavage fragments with blotchy colour, irregular shape and weak birefringence. Micas--Muscovite is chiefly...
1957
Upper Cretaceous (Austin Group) Volcanic Deposits as a Hydrocarbon Trap
Peter J. Hutchinson
GCAGS Transactions
... are also present. A common cavity-filling montmorillonite with high birefringence is tentatively identified as nontronite. Clay minerals compose most...
1994
Cementation And Diagenesis Of The Lameta Beds, Lametaghat, M. P., India
S. K. Chanda
Journal of Sedimentary Research (SEPM)
... orientation. The aggregate has a pinpoint birefringence. (3) Chalcedonic quartz appears to be composed of radiating microfibrous quartz. (4) Magaquartz...
1963
Aquifer Mineralogy and Natural Radionuclides in Groundwater - The Lower Paleozoic of Central Texas
Yongje Kim , Thomas T. Tieh , Ernest B. Ledger
GCAGS Transactions
... content. All phosphate materials are poorly crystalline, or cryptocrystalline; they do not show any birefringence between crossed polars. A slight...
1995
Hardbottoms of the Inner West-Central Florida Continental Shelf
Stephen P. Obrochta, David S. Duncan, Gregg R. Brooks
GCAGS Transactions
... of a grain-supported sample. Subangular to subrounded fine sand-sized grains with low birefringence are quartz. Rounded, fine sand-sized, semi-isotropic...
1998
The "Sawdust Sand"--An Eocene Sediment of Floccule Origin
Wayne A. Pryor, William A. Vanwie
Journal of Sedimentary Research (SEPM)
...) cleavage produces platelets about 5µ thick. The kaolinite crystals have a low birefringence (first-order greys) and a moderate refractive index...
1971
Cristobalite: Its Relationship to Chert Formation in Selected Samples from the Deep Sea Drilling Project
Robert Greenwood
Journal of Sedimentary Research (SEPM)
.... The mineral appears in thin-section either as isotropic material or as a felted mass of microfibers (lussatite) of very low birefringence and positive optical...
1973
Stevensite Oolites from the Green River Formation of Central Utah
Rodney Tettenhorst, George E. Moore, Jr.
Journal of Sedimentary Research (SEPM)
... brown, or rarely dark brown, material with a moderate index and moderate to high birefringence that was identified by x-ray diffraction as a smectite...
1978
Cementation of a Pennsylvanian Deltaic Sandstone: Isotopic Data
L. S. Land, S. P. Dutton
Journal of Sedimentary Research (SEPM)
... nucleation sites for subsequent quartz overgrowths. The chlorite, which is oriented tangentially around the sand grains, has weak birefringence...
1978
The Silicified Evaporite Syndrome--Two Aspects of Silicification History of Former Evaporite Nodules from Southern Kentucky and Northern Tennessee
Kitty Lou Milliken
Journal of Sedimentary Research (SEPM)
... nodules. This variety is unusual because of its low birefringence and because of the presence of randomly distributed laths with undulose, inclined...
1979
Detrital Mode Evolution of the Rifted Continental-Margin Longobucco Sequence (Jurassic), Calabrian Arc, Italy
Gian Gaspare Zuffa, Wilma Gaudio, Silvana Rovito
Journal of Sedimentary Research (SEPM)
... of the quartz, monocrystalline quartz grains are estimated only if the birefringence is less than 0.005 whereas polycrystalline grains are always counted...
1980
Synsedimentary Lacustrine Phosphorites from the Pliocene Glenns Ferry Formation of Southwestern Idaho
Krystyna Swirydczuk, Bruce H. Wilkinson, Gerald R. Smith
Journal of Sedimentary Research (SEPM)
... birefringence at higher magnifications. Most of the phosphate occurs as cortices on ooids, oncoids, and as isopachous cements around grains...
1981
Authigenesis of Titanium Minerals in Two Proterozoic Sedimentary Rocks from Southern and Central Sweden
Sadoon Morad, Ala Adin Aldahan
Journal of Sedimentary Research (SEPM)
... their color is deep brown, and brown in crossed nicols. They may show birefringence if their composing crystals are relatively large. AUTHIGENIC PROCESSES...
1982
Porcelaneous Cement and Microporosity in California Miocene Turbidites--Origin and Effect on Reservoir Properties
Stephen O. Sears
Journal of Sedimentary Research (SEPM)
... are dark. Porcelaneous cement shows pinpoint birefringence typical of chert. End_Page 165------------------------ of sand resulting from several...
1984
Provenance Studies and Mudrocks
Harvey Blatt
Journal of Sedimentary Research (SEPM)
... distinctive minerals such as tourmaline (intense pleochroism) and zircon (a 5-µm zircon grain still has first-order yellow birefringence) can...
1985
Structure of Winnfield Salt Dome, Winn Parish, Louisiana
Robert B. Hoy, Richard M. Foose, B. J. O'Neill, Jr.
AAPG Bulletin
... the following. 1. Both have inclusions identified optically as CaSO4. 2. Both show strain birefringence. 3. When dissolved in water, the "crackle" salt pops...
1962
Authigenic Chabazite and Implications for Weathering in Sirius Group Diamictite, Table Mountain, Dry Valleys, Antarctica
Warren W. Dickinson, Rodney H. Grapes
Journal of Sedimentary Research (SEPM)
... the occlusive cement has blocky borders where exposed to open pore space. The chabazite has moderate relief, and its birefringence is so low...
1997
Origin of Recent Insular Phosphate Rock on a Coral Cay--Raine Island, Northern Great Barrier Reef, Australia
Julian C. Baker , , John S. Jell , Jennifer L.F. Hacker , Kim A. Baublys
Journal of Sedimentary Research (SEPM)
... gray birefringence or light brown to black and isotropic or weakly anisotropic. All microlaminae within single coatings are in optical continuity...
1998