Raman spectroscopy provides insight into carbonate rock fabric based on calcite and dolomite crystal orientation

Carbonate rocks record the oldest forms of life on Earth, and their geologic reconstruction requires multiple methods to determine physical and chemical processes before conclusions of ancient biosignatures are made. Since crystal orientation within rock fabric may be used to infer geologic settings...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2021-06, Vol.52 (6), p.1155-1166
Main Authors: Murphy, Ashley E., Jakubek, Ryan S., Steele, Andrew, Fries, Marc D., Glamoclija, Mihaela
Format: Article
Language:English
Subjects:
Calcite
Calcium carbonate
Carbonate rocks
Chemical reactions
crystal orientation
Crystal structure
Crystallography
Dolomite
Geology
Incident light
lattice mode
Lattice vibration
Limestone
Materials science
Minerals
Orientation
Parameter identification
petrography
Polarization
Propagation
Raman spectroscopy
Spectrum analysis
Structural geology
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Summary:Carbonate rocks record the oldest forms of life on Earth, and their geologic reconstruction requires multiple methods to determine physical and chemical processes before conclusions of ancient biosignatures are made. Since crystal orientation within rock fabric may be used to infer geologic settings, we present here a complementary Raman method to study the orientation of calcite (CaCO3) and dolomite [CaMg (CO3)2] minerals. The relative peak intensity ratio of the carbonate lattice Eg modes T and L reveals the crystallographic orientation of calcite and dolomite with respect to the incident light polarization. Our results for calcite show that when the incident laser light propagates down the crystallographic a/b axis: (1) the L mode is always greater in intensity than the T mode (IT  IL when the incident light propagation is down the crystallographic c axis and (2) IT 
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.6097