A digital image analysis approach to measurement of the conodont colour alteration index (CAI): a case study from the Moravo-Silesian Zone, Czech Republic

BÁBEK, Ondřej, Eva FRANCŮ, Jiří KALVODA and Franz NEUBAUER. A digital image analysis approach to measurement of the conodont colour alteration index (CAI): a case study from the Moravo-Silesian Zone, Czech Republic. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. Stuttgart: E. Schweitzerbartsche Verlagsbuchhandlun, 2008, vol. 249, No 2, p. 185-201. ISSN 0077-7749.

Basic information

• Original name: A digital image analysis approach to measurement of the conodont colour alteration index (CAI): a case study from the Moravo-Silesian Zone, Czech Republic
• Name in Czech: Použití digitální analýzy obrazu pro měření indexu barevné alterace konodontů (CAI): případová studie z moravskoslezské zóny, Česká republika
• Authors: BÁBEK, Ondřej (203 Czech Republic, guarantor), Eva FRANCŮ (203 Czech Republic), Jiří KALVODA (203 Czech Republic) and Franz NEUBAUER (40 Austria).
• Edition: Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, Stuttgart, E. Schweitzerbartsche Verlagsbuchhandlun, 2008, 0077-7749.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10500 1.5. Earth and related environmental sciences
• Country of publisher: Germany
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 0.423
• RIV identification code: RIV/00216224:14310/08:00024876
• Organization unit: Faculty of Science
• UT WoS: 000258751500006
• Keywords in English: RGB colour space; conodonts; colour calibration; spectral reflectance; thermal maturation; Devonian; Carboniferous; Variscides
• Tags: Carboniferous, colour calibration, conodonts, Devonian, RGB colour space, Spectral reflectance, thermal maturation, Variscides
• Tags: International impact, Reviewed

Abstract

Presented is a simple non-destructive method for quantifying conodont colour based on digital processing of conodont images taken by a digital camera attached to a binocular microscope operating under incident light, using the RGB colour space. The digital colour data was calibrated to a spectral reflectance of the standard colour background. The results from the Moravo-Silesian Zone (MSZ) of the Bohemian Massif, Czech Republic, demonstrate an excellent relationship existing between the digital intensities of the red (R), green (G) and blue (B) colours and CAI in the range from CAI 3 to CAI 6. The R/B colour ratio proved the best proxy of CAI. The R/B ratio decreases with increasing CAI from values of about 1.6 (CAI3) to about 1.0 (CAI5) and then slightly increases to 1.15 (mean for CAI 5.5) and 1.26 (mean for CAI6). It is closely related to CAI (R2 = 0.8974) within CAI 3 to CAI 5 interval. The R/B ratio is similar in concept to the slope of the reflectance curve obtained from the spectral reflectance of conodonts by previous authors, as well as to the shift from yellow and brown colours towards greyscale conodont colours with increasing thermal maturation according to the original definition of CAI. Regional distribution of the CAI and R/B ratio from the MSZ suggests that the digital conodont colour data is closely related to vitrinite reflectance and illite crystallinity data.

Abstract (in Czech)

viz. anglický text

Links

• GA205/03/0967, research and development project: Name: Studium tepelné přeměny a vývoje hloubky pohřbení variských karbonátů moravskoslezské pánve na základě indexu barevné přeměny konodontů (CAI)
• MSM0021622412, plan (intention): Name: Interakce mezi chemickými látkami, prostředím a biologickými systémy a jejich důsledky na globální, regionální a lokální úrovni (INCHEMBIOL) (Acronym: INCHEMBIOL)

Investor: Ministry of Education, Youth and Sports of the CR, Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)