The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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AAPG Bulletin; Year: 2024; Issue: February DOI: 10.1306/12202222033
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Figure 14.
Dolomitic calcareous sandstone lithofacies: field emission-scanning electron microscopy (SEM) images of argon ion beam milled samples. (A) Low-magnification color energy-dispersive spectroscopy (EDS) elemental map (Al is green, Si is red, Ca is dark blue, Na is aqua, and Mg is magenta) superimposed on backscattered electron (BSE)-SEM image showing quartz (q), albite (ab), dolomite (d), calcite (ca), pyrite (py), and micrometer-size intraparticle (intraP) pores within dolomitized microfossils. Sample PN6-36. (B) Enlargement of yellow-framed area in (A) showing intraparticle pores within dolomitized microfossil filled with organic matter (OM). (C) Low-magnification color EDS elemental map superimposed on BSE-SEM image showing silt quartz (q), microcrystalline quartz, albite (ab), dolomite (d), calcite (ca), pyrite (py), intraparticle pores (intraP) within dolomite crystals, and micrometer-size interparticle (interP) pores between dolomite and quartz. Sample PND-17. (D) Enlargement of red-framed area in (C) showing micrometer-size interP pores between dolomite crystals and quartz, submicrometer-size interP between quartz microcrystals, and intraP pores within dolomite crystals. (E) High-magnification view of microcrystalline quartz between dolomite crystals. Sample PND-17. (F) Everhart–Thornley detector (ETD) image showing interparticle pores between quartz microcrystals and intraparticle pores within dolomite crystals. Same field of view as (E). BSED = backscattered electron detector; det = detector; HFW = horizontal field width; HV = high voltage (accelerating voltage); mag = magnification; spot = spot size; WD = working distance.
Figure 14. Dolomitic calcareous sandstone lithofacies: field emission-scanning electron microscopy (SEM) images of argon ion beam milled samples. (A) Low-magnification color energy-dispersive spectroscopy (EDS) elemental map (Al is green, Si is red, Ca is dark blue, Na is aqua, and Mg is magenta) superimposed on backscattered electron (BSE)-SEM image showing quartz (q), albite (ab), dolomite (d), calcite (ca), pyrite (py), and micrometer-size intraparticle (intraP) pores within dolomitized microfossils. Sample PN6-36. (B) Enlargement of yellow-framed area in (A) showing intraparticle pores within dolomitized microfossil filled with organic matter (OM). (C) Low-magnification color EDS elemental map superimposed on BSE-SEM image showing silt quartz (q), microcrystalline quartz, albite (ab), dolomite (d), calcite (ca), pyrite (py), intraparticle pores (intraP) within dolomite crystals, and micrometer-size interparticle (interP) pores between dolomite and quartz. Sample PND-17. (D) Enlargement of red-framed area in (C) showing micrometer-size interP pores between dolomite crystals and quartz, submicrometer-size interP between quartz microcrystals, and intraP pores within dolomite crystals. (E) High-magnification view of microcrystalline quartz between dolomite crystals. Sample PND-17. (F) Everhart–Thornley detector (ETD) image showing interparticle pores between quartz microcrystals and intraparticle pores within dolomite crystals. Same field of view as (E). BSED = backscattered electron detector; det = detector; HFW = horizontal field width; HV = high voltage (accelerating voltage); mag = magnification; spot = spot size; WD = working distance.