بررسی اثرات مونسون بر مشخصه های بافتی رسوبات بخش ایرانی فلات قاره شمال دریای عمان خلیج چابهار تا پسابندر.

Investigating the effects of monsoon on the textural characteristics of sediments sediments in the Iranian part of the continental plateau of the North Sea of Oman (Chabahar Bay to Pasbandar).

In this research, the effect of monsoon phenomenon on the textural characteristics of the sediments of Iranian coasts of the Oman Sea was investigated. For this purpose, necessary sampling was done from 13 stations based on marine sedimentological standards. According to the amounts of sand, silt and clay in the pre-monsoon and post-monsoon samples, the sedimentary types of sand, clayey sand, sandy clay and clay were identified in the studied stations. Granulometric analysis showed that the amount of sand and clay in pre-monsoon samples of shallow and near-shore stations (Tiss, Desalination, Center of the Bay, Ramin, Beris and Pasabandar) range from 43 to 97 and 0 – 27%, respectively. On the other hand, these values change between 8 – 45% and 54 - 82 % in deep and offshore stations, respectively. The amount of sand and clay in post-monsoon samples of shallow and near-shore stations vary between 68% - 96% and 0% - 13%, respectively. The amount of sand and clay in deep stations and far from the coast in post-monsoon samples fluctuates between 8-22% and 58-86%. The amount of organic matter in sediments varies between 1 and 3% in most of the studied stations and is within the normal range. This amount showed a slight increase in Konarak and Ramin stations due to human pollutants and fine- grained sedimentary texture. The low amount of organic matter in the desalination station can be caused by the inflow of more saline wastewater into the bay environment. The calcium carbonate content in the sediments is closely related to the amount of sand in the sediments. In Ramin and Tiss stations, where the waves are stronger than the Chabahar bay, they have more calcium carbonate, and on the contrary, the amount of organic matter is higher due to the dilution resulting from the entry of terrigenous sediments and carrying organic matter bearing Fine-grained sediments. The sorting of the samples is medium-good, and the sediment samples from the shallow stations near the coast and deep offshore have negative and positive skewness, respectively, and the elongation index in most of the samples is very elongated. Also, due to the intrusion of the Indian Ocean monsoon winds to the coasts of the Oman Sea in this region and the relatively strong southwest-northeast direction winds, it causes the sea to swell in the summer and erodes the sandstone geological formations of the coastal areas, which is one of the important sources of marine sediments in the study area. These findings emphasize the effect of the monsoon phenomenon on the textural characteristics of the continental plateau sediments of the North Sea of Oman. [ABSTRACT FROM AUTHOR]

Copyright of Applied Sedimentology (2322-147X) is the property of Bu-Ali Sina University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)