Sedimentary components, investigation of facies and depositional environments of Bandar-e Anzali area

Authors

1 Geological Survey of Iran

2 Geological survey of Iran

3 geological Survey of Iran

Abstract

In this research, the facies and marine, coastal and continental depositional environments have been investigated in southern part of the south Caspian Basin (middle part of the Gilan province; Bandar-e Anzali area). In this study, seventy-one surface sediment samples were taken unsystematically from three hundred and twelve recorded points in the shallow areas of the Caspian seabed and surrounding land. Four sediments types, slightly gravelly sandy Mud, slightly gravelly muddy Sand, slightly gravelly Sand and gravelly Sand constitute the largest percentage of all components.Based on X-ray diffraction studies, the sediments are composed of calcite, quartz, feldspar, mica and smectite. The components are classified into two categories: clastic (quartz, feldspar, mica, rock-fragment and clay minerals) and organic-biogenic (plant debris, marine and non-marine organisms (ostracoda, bivalves and Gastropoda)).In general, sedimentation has been done in three areas: land (continental), transition (shore) and marine. The land part composed of the fluvial system (active channel, point bar, flood plain and crevasse splay), coastal plain, wetland, paleo-lagoon, marsh and washover deposits. The transitional and marine parts composed of the shore barrier and the shoreface, respectively.The shore barrier sequence consists of foreshore, backshore and shore dune ridges. Non-marine bioclasts (such as non-marine bivalves Monodancacaspia and Dreissea polymorpha and non-marine gastropods such as Lymnaeidae sp.) in wetland/lagoon, marsh environments and washover deposits and marine bioclasts (such as bivalves Cerastoderma glaucum) has been observed in the washover deposits,

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History

  • Receive Date: 18 June 2024
  • Revise Date: 12 October 2024
  • Accept Date: 16 October 2024

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