Page 116 - Petrology of Sedimentary Rocks

kINERALOGIC CLAN, TEXTURAL

MATURITY, AND TECTONIC BACKGROUND

Almost any rock type can occur in almost any tectonic framework, depending mainly
on source, but stronglyaffected by climate, environment, etc. However, there
seem to be certain preferred associations as shown below. This is a reasonable
estimate, based very largely on North American examples unfortunately. (1963)

QUIESCENCE FAULT BLOCKS
Volt. Arenite

Phyl larenite a

Subphyl lar.

c Qtz-aren i te -

Subark. -

Textural Maturity

I Imnature; I I Submature; III Mature; IV Supermature
(clayey) (poor sorting) (sorted) (rounded)

MIOGEOSYNCLINES EUGEOSYNCLI NES
Volt. arenite

tSubphy1 lar. --c

+Qtzarenite -

Arkose -

I I \ ,‘I,,‘,

Each background diagram is the same, and intends to show the relative abundance of
different maturity classes in each rock clan. Density of shading shows, for a given
tectonic background, the estimated abundance of each clan/maturity combination. Al 1
rocks within the lined area are common; most densely shaded area shows the “classical”
occurrences .
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