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The AAPG/Datapages Combined Publications Database
Showing 440 Results. Searched 195,405 documents.
Structural, Lithologic, and Diagenetic Controls on Dakota Formation Gas Production in the Greater San Arroyo Gas Field, Utah
Joshua P. Dark, Brian S. Currie, Mary L. McPherson, John Rakovan, Tomasz A. Marchlewski
Rocky Mountain Association of Geologists
... in the Dakota. Some instances of large calcite crystals can be identified optically by high birefringence and cleavage planes (Fig. 13). Poikilotopic...
2008
A phosphatic coprolite lacking diagenetic permineralization from the Upper Cretaceous Hell Creek Formation, northeastern Montana: Importance of dietary calcium phosphate in preservation
Kurt T. Hollocher, Thomas C. Hollocher, J. Keith Rigby, Jr.
PALAIOS
... birefringence nor evidence of crystallinity with use of a 1003, 0.95 NA air objective lens and, thus, provides no optical information of its mineral content...
2010
Gabbroic Rocks from the Southern Malay Peninsula and Their Relation to Similar Rocks of Other Orogenic Zones
S. Chandra Kumar
Geological Society of Malaysia (GSM)
... in some samples is clearly zoned with birefringence increasing from core to margin. The iron enriched margins of these grains display abundant exsolved...
1981
Micromorphology and Stable-Isotope Geochemistry of Historical Pedogenic Siderite Formed in PAH-Contaminated Alluvial Clay Soils, Tennessee, U.S.A.
Steven G. Driese, Greg A. Ludvigson, Jennifer A. Roberts, David A. Fowle, Luis A. Gonzalez, Jon Jay Smith, Vijay M. Vulava, Larry D. McKay
Journal of Sedimentary Research (SEPM)
... and sepic-plasmic fabrics. Sepic-plasmic fabrics are recognized by occurrences of “domains” of oriented clay minerals that exhibit high birefringence...
2010
Structural, Lithologic, and Diagenetic Controls on Dakota Formation Gas Production in the Greater San Arroyo Gas Field, Utah
Joshua P. Dark, Brian S. Currie, Mary L. McPherson, John Rakovan, Tomasz A. Marchlewski
Utah Geological Association
... instances of large calcite crystals can be identified optically by high birefringence and cleavage planes (Fig. 13). Poikilotopic calcite...
2008
Mineral Analysis of Sediments
F. J. Pettijohn
Special Publications of SEPM
.... Determination of birefringence (Becke or Schroeder van der Kalk method) Color and pleochroism The absorption and pleochroic formulas should be recorded since...
1955
Pennsylvanian Sandstones of the Eastern Interior Coal Basin
Raymond Siever
Journal of Sedimentary Research (SEPM)
... by its index of refraction, low birefringence, and characteristic vermicular habit (seen only when crystals are of sufficient size). Micaceous and mixed...
1957
Diagenetic History and Reservoir Characterlstics of a Deep Minnelusa Reservoir, Hawk Point Field Powder River Basin, Wyoming
Susan W. James
Rocky Mountain Association of Geologists
... 2), irregular birefringence zonation (“dissolution fringe” of Schenk and Richardson, 1985) along the edges of optically continuous anhydrite remnants...
1989
Primary Dolostone Patterns in the Utah-Nevada Middle Cambrian
John C. Kepper, Jr.
Journal of Sedimentary Research (SEPM)
... have low birefringence and with rare exception have indices of refraction between 1.53 and 1.57. Interference figures were not obtainable, but the low...
1966
Catahoula Formation of Western Louisiana and Thin-section Criteria for Fluviatile Depositional Environment
William R. Paine, A. A. Meyerhoff
Journal of Sedimentary Research (SEPM)
..., that the nodules "... are montmorillonite (low birefringence, wavy extinction), but many are being replaced (largely from the center) by opal... I...
1968
Chapter 10 - Diagenesis: Compaction
Dana S. Ulmer-Scholle, Peter A. Scholle, Juergen Schieber, Robert J. Raine
AAPG Special Volumes
... the highly foliated phyllosilicates crystals are bent, their birefringence varies as their orientation changes in the thin section. In addition, quartz...
2014
Chapter 11 - Diagenesis: Introduction and Quartz & Silica Cements
Dana S. Ulmer-Scholle, Peter A. Scholle, Juergen Schieber, Robert J. Raine
AAPG Special Volumes
..., the bipyramidal shape of quartz can be seen. Microcrystalline quartz normally has a dark gray, anomalous birefringence and some microporosity. These cements...
2014
Paleosols in Permo-Triassic Continental Sediments from Prydz Bay, East Antarctica
Brian R. Turner
Journal of Sedimentary Research (SEPM)
... favors an origin by pedogenic stress (Brewer 1976; Fenwick 1985). Several types of plasmic fabric (Brewer 1976), which are similar to the birefringence...
1993
Middle Miocene Gypsum, Gulf of Suez: Marine or Nonmarine?
Osama E. Attia , Tim K. Lowenstein , Ashraf M.A. Wali
Journal of Sedimentary Research (SEPM)
... by birefringence (Fig. 7A), morphology (Fig. 7B), and chemical composition, determined by EDS FIG. 5. [Grey Scale] Massive selenite with well developed, vertically...
1995
Diagenetic Mineralogy, Geochemistry, and Dynamics of Mesozoic Arkoses, Hartford Rift Basin, Connecticut, U.S.A.
Enrique Merino , Jean-Pierre Girard , Michael T. May , Vishnu Ranganathan
Journal of Sedimentary Research (SEPM)
... refractive index and birefringence, occasional twinning, and common iron oxide dust. Illite and chlorite formed next (Fig. 2D-F, H-K). The chlorite...
1997
Stratigraphic Implications of Meteoric Sphaerosiderite 18O Values in Paleosols of the Cretaceous (Albian) Boulder Creek Formation, Ne British Columbia Foothills, Canada
David F. Ufnar , Luis A. Gonzalez , Greg A. Ludvigson , Robert L. Brenner , Brian J. Witzke
Journal of Sedimentary Research (SEPM)
... are clay-rich mudstones with quartzose, silt-size framework grains in varying modal abundances, and characterized by cross-striated birefringence...
2001
Origin of bedding-parallel calcite “beef” layers in the Upper Jurassic Haynesville shale, northwestern Louisiana
L. Taras Bryndzia, Calum I. Macaulay, Alexander P. Litvinchuk, and Brian D. Monteleone
AAPG Bulletin
... confirmed by scanning electron microscopy and energy-dispersive analysis by x-ray. Birefringence colors are high due to the thickness of the fluid...
2024
High Resolution Sequence Stratigraphy and its Implication in Mixed Siliciclastic Carbonate Sequence: A Case Study from Early to Middle Eocene Sylhet Formation, Assam and Assam-Arakan Basin, India; #30595 (2018)
Snehasis Chakrabarty, Dhritikanta Gorai, Monika Shukla, S. Uppal
Search and Discovery.com
... with strong birefringence and pint point extinction under optical microscope. Pellets are rounded to sub-rounded (<0.8 mm), mostly entire and rarely broken...
2018
Chapter 11: Oil Production from Niobrara Formation, Silo Field, Wyoming: Fracturing Associated with a Possible Wrench Fault System (?)
Stephen A. Sonnenberg, Robert J. Weimer
Rocky Mountain Association of Geologists
..., T. 3330. Martin, M. A., and T. L. Davis, 1987, Shear-wave birefringence: a new tool for evaluating fractured reservoirs: The Leading Edge, Soc...
2011
Important Parameters of Injecting Fluid Design in ASP-EOR Projects
Sugihardjo, Edward ML Tobing, Ego Syahrial
Indonesian Petroleum Association
... if there is a birefringence. If there is, then it may not be injectable. Figure-3 contains pictures of comparison between a clear and hazy solution. Phase Behavior...
2008
A Subsurface Example of a Dolomitized Middle Guadalupian (Permian) Reef from West Texas
Susan A. Longacre
Special Publications of SEPM
... are clearly indicated: gypsum-shaped laths with anhydrite birefringence, and large blocky crystals of anhydrite with gypsum alteration rims...
1983
Tin Mineralization Patterns at Perlombongan Maju Hin Lee, Tanjong Rambutan, Perak, Malaysia
Liau Boon Leong
Geological Society of Malaysia (GSM)
... fractured crystals are healed by pyrite. They exhibit high relief and extremely high birefringence. Twinning and zoning are commonly observed. Sericite...
1991
Silica Diagenesis in the Santa Cruz Mudstone (Upper Miocene), La Honda Basin, California
D. El-Sabbagh, R. E. Garrison
Pacific Section of AAPG
... crossed polarized light. Closely intermingled with the opal-CT cement are clay minerals which appear as minute strands of high birefringence (Figure 5...
1990
Introduction to Memoir 27: A Color Illustrated Guide to Carbonate Rock Constituents, Textures, Cements, and Porosities
AAPG Special Volumes
... (such as measuring birefringence, optic figure, etc.) which will absolutely identify a bryozoan, for example. It is simply a question of experience...
1978
The Texaco Kohpay L 16-WS: The Osage Microgranite Revisited
Matt Hamilton, Barry L. Weaver, R. Douglas Elmore
Oklahoma City Geological Society
... in energy-dispersive analysis, but some iron-free spectra do show a fluorine peak. Given that it is a carbonate and exhibits high birefringence...
2020