Page 120 - Petrology of Sedimentary Rocks

EARLY STAGE

ek - epikratonic basins and
geosynclines
u - up1 ift
P - perikratonic basins,
sheets, and troughs
3 transport directions
WEL TS

GEOSYNCLINE?

LATER STAGE /

eg - epigeosynclinal basins,
troughs, sheets, etc.,
rigidified old mostly lying atop the
mobile belt neokraton
- transport directions

The New Global Tectonics integrated
with Classical Sedimentary Tectonics

The concept of mobile oceanic crust, colliding and splitting continents and plate
tectonics has wreaked great changes in ideas of geosynclines and classical “sedimentary
tectonics” as championed by the workers of the pre- 1960 period. However, one should
not be defeatist and say “let’s throw out all this garbage on nomenclature of
geosynclines,” or “tectonics has no relation to sandstone petrology.” The two schemes
can be satisfactorily inteqrated; true it is not simple but the steak should not be thrown
out with the grease. (See Dott; SEPM Sp. Publ. I9 and 1978 E. Sci. Rev.; and Dickinson,
SEPM Sp. Publ. 22).

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