Messinian forced regressions in the Adana Basin: a near ... - Tübitak

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5.1.3. Bottomset facies The basal deltaic facies are only locally exposed, but are generally similar. The gently inclined delta-toe deposits (Figures 4a and 6) are thinly bedded, fine-grained sandstones and siltstones with plane-parallel stratification and minor ripple cross-lamination. Delta bottomset consists of thin siltstone and sandstone beds intercalated with mudstones (Figure 6). The microfauna content of these deposits is described in a subsequent section. 5.2. Incised valley-fill deposits This facies assemblage is exposed in a chance crosscut section in the proximal part of the Muratlı Member (Figures 1c and 5), but similar unexposed deposits presumably also occur in the 2 other coeval deltaic members 8 ILGAR et al. / Turkish J Earth Sci A B C 1 m E F Figure 3. Messinian evaporites in the Adana Basin. (a) An example outcrop of the evaporites at the top of Handere Formation. (b) Enterolithic gypsum. (c) Crystalline gypsum with a chevron growth structure. (d) Crystalline gypsum with a grassy growth structure. (e) Nodular gypsum. (f) Gypsarenite with wave-ripple cross-lamination. The coin (scale) is 2 cm. D of the Handere Formation, where no similar transverse sections are available. These deposits are recognisably coarser-grained, comprising pebble conglomerates and subordinate coarse-grained sandstones with scattered cobbles and boulders (Figure 5). Conglomerates are clastsupported, with a matrix of medium to coarse sand and granules. Gravel clasts are moderately sorted, mainly subangular to subrounded, and of the same provenance as the delta gravel. Scattered boulders are derived from the basin-margin Miocene reefal limestones. The deposits form erosionally based, vertically stacked fining-upwards bedsets (Figure 5) interpreted to be multistorey braidedstream palaeochannels (Collinson 1996; Miall 1996), mainly 0.8–1.6 m thick and 10–25 m wide. Coarse gravelly channel-floor lags are poorly developed, but solitary
delta topset delta foreset ILGAR et al. / Turkish J Earth Sci B C E F foreset backset Figure 4. Outcrop details of the Muratlı delta, Adana Basin. (a) Longitudinal outcrop section showing an erosional angular contact between the delta’s foreset and topset deposits. (b) Conglomeratic foreset deposits comprising planar parallel-stratified and massive beds. Note the rapid upward increase in the bedding inclination. (c) Close-up detail of the delta topset, showing submature gravel composed of bedrock limestone and serpentinite clasts mixed with large fragments of Miocene corals and reefal limestones. (d) Delta foreset deposits including massive, inversely graded, and nongraded conglomerate beds. (e) Delta foreset detail showing a backset of upslope-dipping gravelly cross-strata. (f) Slump deposits within the delta foreset. Picture A is from locality 1, pictures B–E from locality 2, and picture F from locality 3 in Figure 1c. D coral fragment A 9
Page 1 and 2: Turkish Journal of Earth Sciences h
Page 3 and 4: A AGE FORMATION Holocene alluvium u
Page 5 and 6: form the Çukurova Basin Complex at
Page 7: the basin. The post-Miocene deposit
Page 11 and 12: Figure 6. Simplified vertical profi
Page 13 and 14: a1 d2 i1 a2 ILGAR et al. / Turkish
Page 15 and 16: A 5 4 Middle Messinian ILGAR et al.
Page 17 and 18: A B 1 m sections by Burton-Ferguson
Page 19 and 20: in an estimated period between ~6.4
Page 21 and 22: sea-level changes in the basin. The
Page 23 and 24: Dronkert, H. 1985. Evaporite models
Page 25 and 26: Nemec, W. & Postma, G. 1993. Quater

Messinian forced regressions in the Adana Basin: a near ... - Tübitak

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