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Provenance of Miocene submarine fans in the northern Adana Basin, southern Turkey: A test of discriminant function analysis
Author(s) -
Gürbüz Kemal,
Kelling Gilbert
Publication year - 1993
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350280307
Subject(s) - provenance , geology , petrography , felsic , sedimentary rock , metamorphic rock , paleontology , acritarch , submarine , geochemistry , mafic , oceanography
The provenance of the deep marine clastics of the Cingöz Formation, which were deposited contemporaneously during the Miocene as two small neighbouring submarine fans (western and eastern fans) in the northern part of the Adana Basin, has been studied by: (1) thin section petrography; (2) the use of the ternary discriminant diagrams (Q‐F‐L, Qm‐F‐Lt) of Dickinson et al . (1983); and (3) the use of discriminant function analysis (DFA) techniques. Thin section petrography confirms that the compositions of sandstones in both the western and eastern fans are broadly similar, but they display subtle differences which are related to their local sources. Both of these submarine fans were ultimately supplied from a source area which contained ophiolitic, sedimentary, metamorphic and some felsic igneous rock types. The point counting results have been plotted on the ternary diagrams of Dickinson et al . (1983). On this basis, most of the samples can be assigned to a magmatic arc provenance, with some recycling. There appears to be no significant difference in provenance between these two fans on the basis of these ternary diagrams. Discriminant function analysis of the same data, utilizing the original Dickinson et al . (1983) data set, reveals some otherwise undetected differences in provenance between the two fans. This test also shows that the DFA of sandstones for petrotectonic purposes should be improved by adding further actual data to the data set originally assembled by Dickinson et al . (1983). Moreover the DFA results confirm that in this instance erroneous petrotectonic inferences can be drawn from the Dickinson et al . ternary diagrams as a result of the complex tectonic history of the source, although clues to this complexity can be discerned in the DFA data, provided that the full set of Dickinson categories is deployed. Taken together with the abundant field data these analyses show that the sands and gravels forming these small Mid‐Miocene submarine fans were supplied to the deep marine Adana Basin via two main separate point sources, together with some minor point sources, all located in the Taurus orogenic belt, on the northern margin of the Adana Basin.