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The AAPG/Datapages Combined Publications Database
Showing 440 Results. Searched 195,387 documents.
The Heavy Mineral Population within the Beach Sand Facies of the Meridian Sand Exposed in Mississippi
William R. Reynolds
GCAGS Transactions
... by its parallel extinction, very high relief and high birefringence (0.055-0.059). Zircon is initially derived from granite pegmatite, granite...
1992
Significance of Micro-Crystals of Carbonates in Bituminous Shales. A Preliminary Note
Jun-Ichi R. Takahashi
AAPG Bulletin
... these crystals manifest the characteristic, high birefringence of the carbonate minerals. They are either rhombohedral in form, or of combined forms (0001...
1929
Alteration of Volcanic Ash Near Denver, Colorado
Julius Schlocker, Richard Van Horn
Journal of Sedimentary Research (SEPM)
... nicols. The highly altered platy shards contain numerous tiny laths that have straight extinction and a moderate birefringence. In this and many other...
1958
Review: Geophysical Methods for Karst Detection and Mapping
T. L. Dobecki
Houston Geological Society Bulletin
... shear wave Table 1. Listing of karst targets and geophysical characteristics. End_Page 21--------------- birefringence (splitting into fast and slow...
1990
Heavy Minerals of the Pleistocene Beds of the Don Valley, Toronto, Ontario
D. R. Derry
Journal of Sedimentary Research (SEPM)
... birefringence, but is not very common. It was End_Page 116------------------------ seen in the lower part of the Scarborough clay and in the upper...
1933
Heavy Minerals of the Jacksonian Sediments of Mississippi and Adjacent Areas
Ming-Shan Sun
Journal of Sedimentary Research (SEPM)
... black. Titanite.--Some of the titanite in the samples is similar to zircon, but shows higher birefringence and strong dispersion. Colorless...
1954
Interpreting Detrital Modes of Graywacke and Arkose
William R. Dickinson
Journal of Sedimentary Research (SEPM)
.... Under crossed nicols, both types of grains can present to the viewer a micro-mosaic of anhedral crystals with consistently low birefringence. In chert...
1970
Diagenesis in Tertiary Sandstones from Kettleman North Dome, California. I. Diagenetic Mineralogy
Enrique Merino
Journal of Sedimentary Research (SEPM)
..., birefringence of about 0.04, two good cleavages at 90°, 2V 45°, and strong dispersion r < v about Z). Traces of barite cement are present in a few...
1975
Detrital Grains: Feldspars
AAPG Special Volumes
.... 0.30 mm. (Bottom). Lower Cretaceous Patula Arkose. Mexico. Same as previous photo but with crossed polarizers. High birefringence and speckled...
1979
Detrital Grains: Rock Fragments
AAPG Special Volumes
... birefringence of clay minerals within SRF. These features indicate that the grain is probably an illitic shale clast. XN. 0.10 mm. (Bottom). Jurassic Salt...
1979
Cenomanian-Santonian Calcareous Nannofossil Biostratigraphy of a Transect of Cores Drilled Across the Western Interior Seaway
Timothy J. Bralower, James A. Bergen
Special Publications of SEPM
...: (1) the outer cycle is narrow and faintly birefringent; (2) the middle cycle is narrow and displays a bright, first-order white birefringence...
1998
Beds of Volcanic Material as Key Horizons: GEOLOGICAL NOTES
Clarence S. Ross
AAPG Bulletin
... micaceous in habit, and the birefringence perpendicular to the cleavage is about like that of a mica. The texture varies greatly and in some...
1925
Determination of Wellbore Orientation in the Utica Shale of Southeast Ohio
Brad Bacon, Joseph Smith, Antonio Vizurraga, Evan Rodgers, Jeremy Dumoit
Unconventional Resources Technology Conference (URTEC)
... in the Point Pleasant, and minimal shear birefringence was seen in the dipole sonic logs. Multi-well microseismic data suggests a complex fracture network...
2014
The Nature of Leucoxene
S. A. Tyler, R. W. Marsden
Journal of Sedimentary Research (SEPM)
... polarization may be observed with crossed nicols. The refractive index and birefringence are very high. It is nonmagnetic, insoluble in acids, and has a specific...
1938
Cleaning Mineral Grains For Petrographic Study
Charles M. Gilbert
Journal of Sedimentary Research (SEPM)
... pleochroism and strong birefringence is formed, presumably the very slightly soluble calcium oxalate (whewelite). For example, crushed calcite boiled...
1947
A Preliminary Note on the Geology of the Chini-6 Area: a Base Metals Prospect in the Eastern Belt of the Malay Peninsula
K. L. Low
Geological Society of Malaysia (GSM)
... "bleached" with anomalous birefringence and weakened pleochroism. The phenocrysts are embedded in a fine groundmass which displays equigranular...
1981
Weatherability of Zircon
Dorothy Carroll
Journal of Sedimentary Research (SEPM)
...), and Morgan and Auer (1941) have given a useful outline of their optical properties: Normal type--high refringence and birefringence (<0.05). Hyacinth type...
1953
Hollow Sanidine Grains: Stratigraphic Marker for the Pierce Canyon Formation, West Texas and Southeastern New Mexico
D. N. Miller, Jr.
Journal of Sedimentary Research (SEPM)
... continuity with the outer shell. Zonation is more evident around the decomposed cavity but only indirectly so because the birefringence blurs...
1955
Relations of Gypsum and Anhydrite: DISCUSSION
Marcus I. Goldman
Journal of Sedimentary Research (SEPM)
... anhydrite, of crystals of low birefringence or "oblique to the optical axes" (Ogniben, p. 67, column 2) is not necessarily a characteristic...
1957
Thin Sections of Clay and Shale: NOTES
Harry A. Tourtelot
Journal of Sedimentary Research (SEPM)
... not require heat. The chief disadvantage of the impregnating wax medium is that it is not isotropic. The birefringence of the wax seems to vary from slide...
1961
Authigenic Clay Mineral Cements in Cretaceous and Tertiary Sandstones of Alberta
M. A. Carrigy, G. B. Mellon
Journal of Sedimentary Research (SEPM)
... in a few sandstones. The mineral is colorless, has low birefringence, and refractive indices greater than 1.54. It can be distinguished from...
1964
Authigenic K-NH4-Feldspar in Sandstones: A Fingerprint of the Diagenesis of Organic Matter
Karl Ramseyer , Larryn W. Diamond , James R. Boles
Journal of Sedimentary Research (SEPM)
... of a detrital K-feldspar grain with a fracture filling (arrow) of low birefringence, from the Stevens Sand (2750.5 m), North Coles Levee oil field...
1993
Paleosols Below the Ames Marine Unit (Upper Pennsylvanian, Conemaugh Group) in the Appalachian Basin, U.S.A.: Variability on an Ancient Depositional Landscape
R.M. Joeckel
Journal of Sedimentary Research (SEPM)
..., nodules or coatings of radial calcite spar, preserved soil microstructure, soil-compatible birefringence fabrics, and prominent mottling (commonly...
1995
Thermal Alteration of Blue-Green Algae and Blue-Green Algal Chlorophyll
John H. Oehler , Z. Aizenshtat , J. William Schopf
AAPG Bulletin
... arrangement of their component polysaccharides and pectic substances (Lang, 1968). This birefringence and the hyaline sheath color were virtually...
1974
Sandstone in Lower Cretaceous Helvetiafjellet Formation, Svalbard: Bearing on Reservoir Potential of Barents Shelf
Marc B. Edwards
AAPG Bulletin
... which, in contrast to kaolinite, stand out as bright lines due to moderate birefringence (Fig. 6). It is not abundant and is in grain coatings and pore...
1979