PALAEOGEOGRAPHIC EVULATION OF SİVAS TERTIARY BASIN'(W-SW SİVAS)

Year 1999, Volume: 121 Issue: 121, 57 - 57, 01.02.1999

Zeki Atalay

Abstract

Sedimentological studies has been
made at the west and the south west of Sivas (Figure 1) and investigated
palaegeographic evolution fades and environmental features of deposite rocks. A
A1 A2 A 3 fades have been recognized at the middle Eosen aged Sahantepe member.
A A1 fades has deposited at the continental shelf; A2 A3 facies at swamp and
coastal sabkha. B B1 B2 B3 fades have been recognized at the Oligocene aged
Küçüktuzhisar Formation. B facies in lagoon, B1 facies has deposited-in barrier
island. B2 B3 facies have deposited at continental sabkha and playa lake
enviroment. At the Akören formation C C1 C2 C3 C4 C5 C6 C7 facies have been
recognized..C C1 C2 facies at the meandering river and subenviroments. C3 C4
facies at the playa lake. C5 C6 facies meandering river and C7 facies has
deposited at alluvial fan enviroments. Continental shelf deposits cinsists of
claystone, siltstone and sandstone, has very well (Ta-Tb), (Ta-Tc) and (Ta)
structures These have been deposited by turbidite flows is shallow sea
improved. At in the coastal sabkha enviroment have been deposited gypsum series
and they are together with elastics. Meandering river deposits consist of
channel fill, point bar and flood plain subfacies finning upward cycles. Playa
lake and continental sabkha deposits consist of terrestrial elastics with
interlayer gypsum and anhidrite; alluvial fan deposits consist of conglomerates
and poorly sorted, pebbly sandstone with muddy matriks and show normal and
reserve grading. In the studied area the marine regime has been the dominating
agent up to of Eocene- then the marine influence has restrained but continental
rejime, as a result of this swamp and coastal sabkha enviroments have improved
During Oligocene period has become more effective. During this period
continental sabkha, playa lake, meandering river and alluvial fan enviroments
have been made. At the Sahantepe member palaeocurrent direction is towards from
the NE to NW: at the Küçüktuzhisar Formation palaeocurrent directions are
towards from the N to S and NW to SE and at the Akören formation palaeocurrent
directions are towards from S to N, SW to NE. In Eocene period the formations
(Bozbel Formation - Sahantepe Member) was supported by the ofhiolites and
metamorhic units, situated in the NE of the region and Oligocene period these
for mations (Küçüktuzhisar and Akören Formations) were supported by the
ophiolites and metamorphic units and deep asidic and basic rock as well as
volcanits situated in the SW and NW of the region. On the basis of these
observations, in can clearly be in dicated that the Sivas basin reflects a
intraplate basin characteristics following the continent-continent collision.

Keywords

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