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Extra resources for Compaction of Coarse-grained Sediments, II
It is clear that simple mixing requires large quantities of common rocks to be mixed with basalt. (After Taylor, 1968,fig. ) 5 Log ISiOZl Altos 1 Fig. SiO2/Al2O3 versus Na20/K20 ratios of sandstones. Stipple outlines area of most analyses. Contours (heavy lines) show values of log [(SiOz + A1203)/(Na20 + KzO)]. Analyses drawn largely from Pettijohn (1963). , 1972,fig. 2-11,p. ) See also Garrels and Mackenzie (1971,figs. 8-4and 9-1,p. , 1972, fig. 2-10, p. ) Structural framework: anion Exchangeable cations Associated petrographic type alkaline-earth-rich (carbonate cement) quartz arenites POUP High SiOz /Alz O3 ratio (mature) (little clay or detrital Al-silicate) alkaline-earth-poor (silica cement) Low SiOz /Alz O 3 ratio (immature) alkali-metal-rich (clay + detrital Al-silicate) (feldspar and clays) alkali-metal-poor (aluminous clays) Naz 0 > Kz 0 feldspathic graywackes Naz 0 < Kz 0 arkoses; lithic graywackes lithic arenites give rise to an igneous rock of andesite composition (Fig.
1-18E), the two principal stresses are equal, while two faces of the cube are held stationary. H. V. F. BRANAGAN 24 C D E Fig. Compaction loading classification. A. Polyaxial loading (p1 # p # p 3 ) , called “triaxial” by some investigators; B. hydrostatic loading (pl= p 2 = p g ) ; C. triaxial loading (pi = p 2 # p 3 ) , called “biaxial” loading by some investigators; D. uniaxial loading; four sides parallel to the stress p 3 are kept stationary; referred to as “biaxial” loading by some investigators; E.
1-24. Integration of data from the three sample suites shows that three stages of chemical diagenesis can be differentiated. Physical diagenesis, in the form of grain deformation and mechanical compaction, is especially pronounced in early to intermediate stages of burial when the fabric of the sandstone is open and cementation has not significantly filled-in available pore space. Formation of early calcite pore-filling cement (Stage 1) effectively insulates the sandstone from further diagenetic alteration or compaction until deep burial.
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