The paper discusses the influence of variable experimental conditions on the thermal decomposition of carbonate minerals.
This study was based on Ca-Mg carbonate minerals from Upper Permian dolomite and zuber rocks as well as on calcite and magnesite
samples from geological formations of various ages. X-ray diffraction was applied for comparative purposes. Experimental conditions
were chosen based on the authors' experience related to studies of both fossil and contemporary organic matters as well as
various materials of geological provenience. Since the main factor in thermal analysis of carbonates is the appropriate choice
of experimental conditions for outflow of gaseous reaction products, the thermal analyses were carried out with various sample
holders, various sample masses and varied thickness of sample layers in holders, using also a dynamic atmosphere. The results
obtained indicated that different experimental conditions produced extremely different TA data, e.g. the traditional analysis
in crucible sample holders with a thick sample layer (great sample mass) showed well expressed double thermal effects of dolomite.
For thin sample layer both peaks of thermal decomposition of carbonate components occurred in very close or almost identical
temperatures. The presented results enabled to devise a detailed procedure referring to the choice of experimental conditions
and interpretation possibilities as well as to recommend specific TA instruments design and sample holders types.