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Asian Journal of Earth Sciences
  Year: 2014 | Volume: 7 | Issue: 1 | Page No.: 17-26
DOI: 10.3923/ajes.2014.17.26
 
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Depositional Environment Interpretation of Lar Formation (Upper Jurassic) Based on Study of Clay Mineralogy and Microfacies in East Azarbaijan (North Western of Iran)

Payman Rezaee and Sajjad Abas Alinejad

Abstract:
Microscopic and field studies on the Lar formation in south west of Azarshahr in Haft-Cheshme anticline section is due to separate of three part of marl, marly carbonate and carbonate in this formation. According to microfacies and macroscopic fossils in carbonate section, open marine environment were identified from a carbonate ramp. XRD test samples related to clay marl in the low and middle part indicated existence of clay mineral such as illite and cholorite from clastic origin in the part of upper and middle marl and illite and smectite are diagenetic origin in the lower marl. The simultaneous presence of the minerals in the middle marl and the lack of smectite in this section represent of temperate climate conditions are during deposition of the middle marl. The semi-quantitative analysis of the XRD is indicating of smectitec increasing and illite decreasing in the lower marl part which it may represent of a warming climate and depth sea relative increase and it was consistent with sea level change global. Important digenetic process of identified in these formations are include: Cementation, primary and secondary porosity and chert nodules formations (constituents) which the secondary porosity is more than a fracture and channel types. The existence of these fractures has created suitable underground water aquifers in this area.
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How to cite this article:

Payman Rezaee and Sajjad Abas Alinejad, 2014. Depositional Environment Interpretation of Lar Formation (Upper Jurassic) Based on Study of Clay Mineralogy and Microfacies in East Azarbaijan (North Western of Iran). Asian Journal of Earth Sciences, 7: 17-26.

DOI: 10.3923/ajes.2014.17.26

URL: https://scialert.net/abstract/?doi=ajes.2014.17.26

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