The qualitative and quantitative X-ray diffraction analysis established that its major minerals include detrital minerals like quartz and feldspars, with an average content of 45%, as well as clay minerals like kaolinite, andreattite and illite, with an average content of 37% (Table 1).
In addition to rich organic matter, it also contains detrital minerals like quartz and feldspars, as well as clay minerals like kaolinite, andreattite and illite, with the respective average content of 45% (detrital minerals) and 37% (clay minerals).
Arditto (1983) suggested that much of the kaolinite matrix in the Pilliga Sandstone resulted from the post-depositional alteration of unstable detrital minerals
by reaction with mobile groundwater.
A variety of C-rich and magnetic particles, shocked quartz grains, and detrital minerals, including phosphate fragments of brachiopod fossils with dark coatings, have been observed in the ejecta (Puura et al.
Shock-pressure effects of detrital minerals are described.
Coarse-grained detrital minerals
are rare in the Shengli River oil shale; the absorption of finegrained minerals and/or organic matter may be the main mode of occurrence of Rb, Sr, Sm and Nd.
4, Table 1): (1) dolostone group including 23 samples; (2) dolomitic marlstones represented by 17 samples; (3) the group of mixed carbonate-siliciclastic rocks including 9 cement-rich siltstone samples, 8 cement-supported sandstone samples, 6 samples of dolomitic marlstone rich in detrital minerals, and 1 dolostone sample, the last one containing abundant detrital-rich interlayers; (4) siliciclastic rocks represented by 23 sandstone and 9 siltstone samples with grain-supported texture.
Detrital minerals are often concentrated along bedding surfaces, together with frequent finely crystalline authigenic dolomite grains (Fig.
Micas are usually dominating among detrital minerals, accounting for 40-65%.