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The AAPG/Datapages Combined Publications Database

Showing 440 Results. Searched 195,354 documents.

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Hydromagnesite Stromatolites and Sediments in an Alkaline Lake, Salda Golu, Turkey

C. J. R. Braithwaite , Velsel Zedef

Journal of Sedimentary Research (SEPM)

... hydromagnesite matrix. Adjacent areas may contain few tubules or none. Tubules are typically lined internally with low-birefringence bladed crystals (about...

1996

Chapter 3 - Grains: Rock Fragments (Lithic Fragments)

Dana S. Ulmer-Scholle, Peter A. Scholle, Juergen Schieber, Robert J. Raine

AAPG Special Volumes

..., making them brown in plane light. Other: Diagenesis can alter the composition of grains. Bright birefringence in argillaceous grains, for example...

2014

Microstructure and mineral composition of Holocene stromatolites from Lagoa Vermelha, a hypersaline lagoon in Brazil: Insights into laminae genesis

Carolina N. Keim, Hélisson Nascimento dos Santos, Carolina Souza Santiago, Simone Pennafirme, Reiner Neumann, Jürgen Schnellrath, Inayá Lima, Mirian A.C. Crapez, Marcos Farina

Journal of Sedimentary Research (SEPM)

... showing weak or no birefringence. Two types of laminae can be distinguished, one peloidal and the other homogeneous. A mineral fringe or palisade coated...

2020

Chapter 20 - Diagenesis: Replacement & Recrystallization

Dana S. Ulmer-Scholle, Peter A. Scholle, Juergen Schieber, Robert J. Raine

AAPG Special Volumes

....   This orthoclase grain was partially replaced by calcite (the high-birefringence mineral in cross-polarized light). The calcite preserves the exterior...

2014

Virgilian (Upper Pennsylvanian) Paleosols in the Upper Lawrence Formation (Douglas Group) and in the Snyderville Shale Member (Oread Formation, Shawnee Group) of the Northern Midcontinent, USA: Pedologic Contrasts in a Cyclothem Sequence

R.M. Joeckel

Journal of Sedimentary Research (SEPM)

... common) have an undifferentiated birefringence fabric (see Bullock et al. 1985) and indicate at least some preburial segregation of iron oxides...

1994

Chapter 5: Low-latitude Oxfordian to Early Berriasian Nannofossil Biostratigraphy and its Application to the Subsurface of Eastern Texas

J. A. Bergen, T. M. Boesiger, J. J. Pospichal

AAPG Special Volumes

... birefringence. Specimens with broad axial crosses nearly filling the central area have also been observed, but their stratigraphic significance is not yet...

2013

Fractured Reservoir Characterization: Integrating Production and Seismic Data to Optimize Well Placement in Bluebell Field, Uinta Basin, NE Utah

Steven L. Adams, James Schuelke, Dennis Shannon, John Kucewicz, Christopher Latkiewicz

Unconventional Resources Technology Conference (URTEC)

... sonic log data shows that shear birefringence (S1–S2 separation) is a good indicator of open fractures, as production log data showed that total fluid...

2014

Fractured Reservoir Characterization Using Multicomponent Seismic Surveys

Thomas L. Davis, Robert D. Benson

Rocky Mountain Association of Geologists

... birefringence or shearwave splitting (Martin and Davis, 1987). Natural fracturing constitutes a major source of reservoir heterogeneity by inducing permeability...

1992

Authigenic Heulandite in Sandstone, Santa Cruz County, California

Charles M. Gilbert, Martin G. McAndrews

Journal of Sedimentary Research (SEPM)

... measurements made. Optical properties.--The birefringence of the authigenic heulandite is very low approximately .007, and the mean refractive index (ß...

1948

Mineralogy and Petrology of the Rocks Near the Quadrant-phosphoria Boundary in Southwest Montana

Charles E. Weaver

Journal of Sedimentary Research (SEPM)

... is extremely fine-grained, averaging one micron, and has a typical pepper and salt birefringence. (The grain size of chert in thin sections is based...

1955

Authigenic Brookite in Cretaceous Gallup Sandstone, Gallup, New Mexico

Ming-Shan Sun, John Eliot Allen

Journal of Sedimentary Research (SEPM)

... pyramidal grain of anatase was identified. It has extreme birefringence and is optically uniaxial negative. Apatite.--A few small prismatic crystals were...

1957

Chapter 12 - Diagenesis: Feldspar Cements

Dana S. Ulmer-Scholle, Peter A. Scholle, Juergen Schieber, Robert J. Raine

AAPG Special Volumes

... overgrowth. Because the overgrowth, likely albite, is compositionally different from the core grain, the birefringence is also different. The orthoclase...

2014

Diabase Argillation at King Mountain, Kiowa County, Oklahoma

Clayton R. Nichols

Journal of Sedimentary Research (SEPM)

.... The chlorite displays parallel to near-parallel extinction, a green to yellow-green color, and very low birefringence. Quartz grains with undulose...

1970

Correlative Light Optical and Scanning Electron Microscopy of Minerals: A Methodology Study

L. P. Wilding, H. D. Geissinger

Journal of Sedimentary Research (SEPM)

... micrographs showed that the coating had no apparent detrimental effect on transilluminated color, relief, pleochroism, interference figures, birefringence...

1973

Metamorphosed Berthierine Pellets in Mid-Cretaceous Rocks from North-eastern Algeria

B. Velde, J.-F. Raoult, M. Leikine

Journal of Sedimentary Research (SEPM)

...-green color of the glauconite in plane polarized light--and brown green or red brown colorations of the chlorites. The birefringence of the chlorites...

1974

Detrital Grains: Quartz

AAPG Special Volumes

... birefringence, lack of cleavage and twinning, low positive relief, and uniaxial positive interference figure. Many quartz types have been defined, based...

1979

Studies of Pegmatitic Cassiterites from the Gunung Jerai (Kedah), Bakri (Johore) and Kathu Valley (Phuket) Regions

Y. H. Lye

Geological Society of Malaysia (GSM)

... cassiterite. They may very probably be sphene due to reasons given below: (i) Rhombic shaped grains of high relief, birefringence and dispersion suggestive...

1984

ABSTRACT: Anisotropic PP and PSv Prestack Depth Migration of 4C _OBC_ Seismic Data, Pamberi, Offshore Trinidad

Tony Johns, Carmen Vito and Raul Sarmiento

Geological Society of Trinidad & Tobago

... to proceeding with the anisotropic depth imaging, the magnitude of shear splitting (or, birefringence) from the presence of azimuthal anisotropy (HTI...

2007

Sepiolite from Kramat Pulai, Perak

Aw Peck Chin

Geological Society of Malaysia (GSM)

... extinction which is nearly parallel to the length, with positive elongation. The birefringence is low and the interference figure is negative, 2V...

1990

Shale Gas in South Africa

James Mullins

GEO ExPro Magazine

... that a highly volatile mixing has occurred and highlights the possibility for rock formation via a volatile hydrothermal flow. Fibrous strong birefringence...

2015

Quantitative Image Analysis For Geologic Core Description

Roger J. Barnaby

Journal of Sedimentary Research (SEPM)

... and high birefringence), outer margin of nodule dominated by blocky crystals of gypsum (low order gray birefringence) with scattered anhydrite inclusions...

2017

A High Index Refractometer

R. C. Emmons, E. F. Williams

Journal of Sedimentary Research (SEPM)

... birefringence, (2) smithsonite being chosen. An elongate hole was cut in a standard glass slide. To accomplish this a quarter inch brass tube, notched...

1934

Impregnation of Moist and Dry Unconsolidated Clay Samples Using Spurr Resin for Microstructural Studies: RESEARCH METHOD PAPER

C. Y. Jim

Journal of Sedimentary Research (SEPM)

... the samples and induce mechanical birefringence as a result of strain (Meltzer 1965). Hence, curing is performed very gradually in four temperature steps-30°C...

1985

Calibration of a Point-Counting Technique for Estimation of Biogenic Silica in Marine Sediments: RESEARCH METHOD PAPER

Carol J. Pudsey

Journal of Sedimentary Research (SEPM)

... silt grains appear yellow and gray (first-order birefringence colors) on a light-gray background. Three hundred points were counted, and each slide...

1993

Inorganic Calcite Morphology: Roles of Fluid Chemistry and Fluid Flow: REPLY

J. A. D. Dickson

Journal of Sedimentary Research (SEPM)

... is of normal thickness (30 µm) because of the extremely high birefringence of calcite. This test should be performed using specially cut thin sections...

1993

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