Heavy a core sediment, (2) and assume the

Heavy metalbehavior in vertical profiles of core samples in coastal sediment have beenconsidered as an effective indices finding out the historical trends ofpollution(Al-mur, Quicksall, Al-ansari, & Sea, 2017; Gao,Wang, Li, & Chen, 2018; Veerasingam, Vethamony, Murali, & Fernandes,2014),toxicity and pollution sources (Archaimbault, Usseglio-Polatera, Garric, Wasson,& Babut, 2010)andchemical reactions in solid phase (Jourabchi, L’Heureux, Meile, & Cappellen, 2010)etc. These kind ofstudies can give authentic historical record of different influences in the oceanicsystem by indicating both natural background level (Fukue et al., 2006)and the man inducedaccumulation of elements over an extended period of time  (Buckley, Smith, & Winters, 1995)sediments are the primarycarrier of heavy metals in the marine environment due to the chemical-physicalproperties, such as particle characteristics (Rath, Panda, Bhatta, & Sahu, 2009), furthermore, core sedimentsalso provides a historical record of heavy metal distribution over the time(Williams & Block, 2015).

Levels of heavy metals inbottom sediments can illustrate pre-industrial and it could be find out aboutrecent years pollutions from surface sediments in the costal environment (Ferati, Kerolli-Mustafa, & Kraja-Ylli, 2015). The coastal areas of Iran onthe Persian Gulf have been polluted by land-based activities in terms ofindustry growth for many years(Pejman, Nabi Bidhendi, Ardestani, Saeedi, , 2015).Research with respect to trace elements in sediments can give helpful informationsfor identifying sources of contamination in aquatic areas The Nayband Bay ,is anIndustrial area and is located near an important gas source area in theAssaluyeh, North West Persian Gulf. Since past dacades, this Bay sediments wereseverely polluted by Heavy metals which are came certainly from industrials(Ranjbar, Riyahi, Shadmehri, & Jadot, 2017).

Too little information isavailable due to small number of researches which is focused in the sedimentsin Persian Gulf Area(Karbassi, 1998). Therefore, the aims of thisstudy were to (10) measure Heavy metals contamination in a core sediment, (2)and assume the origin of these pollution and when it happens due to dating ofthe sediment.