Clays and Clay Minerals, Vol. 56, No. 6, 660–676, 2008.
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Authors
Gurel, Ali
Issue Date
2008
Type
Article
Language
Keywords
Periodicals , Geology , Alluvial Fan , Aktoprak Basin , Clay Minerals , Kızılbayır Formation , Lacustrine Sediments , Late Miocene , Palygorskite
Alternative Title
Sedimentological And Mineralogical Investigation Of The Late Miocene Successions Of Aktoprak Basin (central Turkey): Implications For Sediment Source And Paleoclimates
Abstract
Late Miocene (Messinian) alluvial and lacustrine deposits characterize the so-called Kızılbayır Formation of the Aktoprak Basin (central Turkey) and consist of conglomerate, sandstone, mudstone, limestone, marl, and dolomite units. These sediments are composed mainly of feldspar, quartz, hornblende, diopside, olivine, serpentine, calcite, and dolomite with subordinate palygorskite, chlorite, smectite, and illite. Studies by scanning electron microscopy indicate that calcite and dolomite show both meniscus and micrite-sparite-type cements, characteristic of both vadose and phreatic zones. Chlorite, smectite, and illite are products of the alteration of the underlying Gu¨ney Formation with subsequent transportation by local streams into the Kızılbayır Formation, and therefore these are considered to be reworked materials. Authigenic palygorskite and dolomite formed as a result of the calcretion of mudstone-carbonate units under alkaline conditions, with high Si, Ca, and Mg activity, and low Al, originated from ophiolitic and carbonate units based on the increase in Ni and Co. The paragenesis and textural features of the minerals of the alluvial fan and lacustrine sediments determined in the study area indicate that precipitation probably occurred due to climate fluctuations ranging from arid and semi-arid to wet conditions.
Description
gsccm56607-gur.pdf - 2,616KB
Citation
Clays and Clay Minerals, Vol. 56, No. 6, 660–676, 2008.
Publisher
The Clay Minerals Society
License
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