Cathodoluminescence colors in sedimentary phosphates
- Ohio Univ., Athens, OH (United States). Dept. of Geological Sciences
- Savannah River Lab., Aiken, SC (United States)
Intensity and color of cathodoluminescence (CL) in sedimentary phosphates vary considerably. Colors include: pink, orange, violet, yellow, blue, green, brown, gray, and non-luminescent. Examples analyzed for trace element activators and quenchers of CL consist of: the Tokammane Formation of Spitsbergen (CL = bright pink-orange), the Wood Canyon Formation of California (CL = bright yellow and violet), eight Pennsylvanian black shales of Kansas/Oklahoma (CL = dull violet), the Phosphoria Formation of Montana (CL = dull violet), and the Monterey Formation of California (non-luminescent). Iron quenches CL, whereas manganese is as an activator. Preliminary data on the above samples and earlier studies by other workers investigating igneous and metamorphic apatite suggest that Mn activates yellow CL. Some rare earth elements also activate CL. Either the effectiveness of REE and/or their higher abundance in phosphates allows for dull to bright CL even in the presence of several Wt.% FeO. Analysis from additional phosphates suggests that phosphates from distinct depositional/diagenetic settings may exhibit unique CL color and/or intensity. Concretionary epicontinental sea phosphates are dull violet. Nearshore, reworked phosphates luminesce brightly (yellow and/or pink-orange).
- OSTI ID:
- 5623574
- Report Number(s):
- CONF-921058-; CODEN: GAAPBC
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Vol. 24:7; Conference: 1992 annual meeting of the Geological Society of America (GSA), Cincinnati, OH (United States), 26-29 Oct 1992; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
58 GEOSCIENCES
PHOSPHATE MINERALS
CATHODOLUMINESCENCE
APATITES
BLACK SHALES
CALIFORNIA
COLOR
GEOLOGIC FORMATIONS
IRON
KANSAS
MANGANESE
MONTANA
NEW YORK
OKLAHOMA
SAMPLING
DEVELOPED COUNTRIES
ELEMENTS
LUMINESCENCE
METALS
MINERALS
NORTH AMERICA
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
ROCKS
SEDIMENTARY ROCKS
SHALES
TRANSITION ELEMENTS
USA
400102* - Chemical & Spectral Procedures
580000 - Geosciences