Sedimentary facies, mineralogy, and geochemistry of the sulphate-bearing Miocene Dam Formation in Qatar

H. G. Dill, R. Botz, Z. Berner, D. Stüben, S. Nasir, H. Al-Saad

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The Miocene deposits of the Dam Formation were deposited in a narrow seaway stretching along the western edge of the Qatar Arch. During the initial stages of basin evolution the rising Zagros Mts. delivered debris in this fore deep basin. The paleocurrent and paleogeographic zonation are reflected by the heavy mineral assemblage, by the spatial distribution of phyllosilicates and the various types of sulphate. From NW towards the SE, the contents of smectite and palygorskite increase, whereas the illite and kaolinite contents decrease. Mega crystals of gypsum are found in the NW and massive fine-grained gypsum in the SE of the basin. During the waning stages of basin subsidence, the Arabian Shield became more and more important as a source for the Miocene sediments. In this study, the Dam Formation was subdivided into 7 members/lithofacies associations (lower, middle, upper Salwa, and Al Nakhsh Members, Abu Samrah Member). The Salwa Members at the base of the Dam Formation consists of heterolithic siliciclastic-calcareous sediments which were laid down under meso- to microtidal conditions. The Al Nakhsh Members formed under macrotidal conditions with sub- to supratidal depositional environments passing into continental ones. Celestite, gypsum, and microbial mats (stromatolites) are very widespread in these sabkha sediments. Crystals of gypsum and the thickness of stromatolites tremendously increase towards younger sediments indicating thereby a close genetic link between growth of microbial domes and gypsum precipitation. Throughout the Abu Samrah Member marine calcareous sediments were deposited in a microtidal wave-dominated environment. Dissolution of Eocene evaporites at depth governed the lithofacies differentiation in the Miocene Dam Formation.

Original languageEnglish
Pages (from-to)63-96
Number of pages34
JournalSedimentary Geology
Volume174
Issue number1-2
DOIs
Publication statusPublished - Jan 18 2005

Fingerprint

gypsum
mineralogy
dam
geochemistry
Miocene
sulfate
sediment
lithofacies
basin
crystal
celestine
palygorskite
sabkha
paleocurrent
microbial mat
phyllosilicate
heavy mineral
basin evolution
evaporite
arch

Keywords

  • Deposition
  • Evaporite
  • Miocene
  • Qatar
  • Sabkha
  • Siliciclastic-calcareous

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

Cite this

Sedimentary facies, mineralogy, and geochemistry of the sulphate-bearing Miocene Dam Formation in Qatar. / Dill, H. G.; Botz, R.; Berner, Z.; Stüben, D.; Nasir, S.; Al-Saad, H.

In: Sedimentary Geology, Vol. 174, No. 1-2, 18.01.2005, p. 63-96.

Research output: Contribution to journalArticle

Dill, H. G. ; Botz, R. ; Berner, Z. ; Stüben, D. ; Nasir, S. ; Al-Saad, H. / Sedimentary facies, mineralogy, and geochemistry of the sulphate-bearing Miocene Dam Formation in Qatar. In: Sedimentary Geology. 2005 ; Vol. 174, No. 1-2. pp. 63-96.
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