Abstract
In excavation of the tepe Zaghe the Dam 4-karun,were found different metal objects from middle-Illam.ln this article four metal earrings was studies experimental and analytical. For this purpose use of electron microscopy (SEM-EDS) to identify alloy combination and also microstructure of manufacturing and use of X-ray radiography and Optical Microscopy (OM) to identify construction method and shaping objects. Chemical analysis result show that they made from brass, pure copper, bronze and silver. Microscopic studies showed that the microstructure of the samples including of metallic matrix with sulfide inclusions and lead cells. Brass earrings mading is in the cycle of cold and annealing work and final step in shaping is also cold method. copper and silver earrings are made in alternating cycles of hammering and molding. In the bronze earrings, the presence of dendrites also indicates made from casting method. Also Energy Dispersive X-ray Spectroscopy (XRD), electron microscope (SEM-EDS) and Optical Microscopy (OM) used to identify layers formed. The phenomenon found in the all samples is oxidation. In The copper corrosion samples Copperite and Malachite.Also in the silver sample corrosionlayer, the amount of chlorine and oxygen was increased that made to silver oxide or acanthite.
Keywords: Tepe Zaghe The Dam 4-Karun, Late Bronze /Early Iron Age–Second Millennium BC, Metal Earring, Conservation and Restoration.

Introduction
According to archaeological findings the use of metals in the plateau of Iran and other neighboring areas expands significantly in the second millennium BC. At the end of the second millennium and the beginning of the first millennium BC, using of the metals such as bronze, iron, gold, and silver was common in Iran to making metal objects with different uses.
The catchment area of Karun Dam 4 has been subjected to archeological investigation in 2015 so many hills and sites were discovered belonging to the prehistoric, historical and Islamic eras. One of the important works of the dam lake area is the k4-4 area under the ammunition slum, which was explored during to the 1387 and 1388 in two seasons. numerous bronze objects were discovered, that are mainly ornaments. In this research, she studied the technology and pathology of four earrings, including two small hoop earrings, one wide hoop earring, and one pendant earring. The discovery and study of this collection in terms of belonging to small groups (because the uncovered architectural findings show parts of a small village probably it,s a season that housed a small population of nomadic Elamites) and in the oher words, the normal and very influential society of the Middle Elam period. That have less known to exploreing is important. Considering that no independent research has been done on the knowledge of the technology of the metals explored in this province, and most of the investigations are archaeological research, structural study and identification of the composition of the alloy and elements in the microstructure, technology and identification of the manufacturing and objects forming. Objects, pathology and identification of the layers formed on exposed objects by relying on instrumental and laboratory methods can identify a part of the culture and art of the nomadic tribes of the region for us and multiply the importance of studying and protecting historical-cultural artifacts. On the other hand, graves and the objects inside them can be considered as a living image of special moments in the life of past societies, which provides valuable information in the fields of chronology, ethnography, anthropology, social and economic relations, and social classes (Talaee 2011).
In order to reach to the above mentioned goals, two main questions 1 - elemental composition, type of alloy and how to make the four earrings in question 2 - the process of destruction and corrosion in the mentioned objects including two small hoop earrings, a wide hoop earring and a hanging earring are raised and In the process of this research, the effort was to reach an answer for them based on the studies conducted.

Identified Traces
Most of the studies in the catchment area of Karun Dam4 are limited to archaeological studies. This area was investigated by Aliasghar Noruzi, a member of the faculty of the Research Institute of Archaeology, during which many hills and areas belonging to prehistoric, historical and Islamic eras were discovered in 2015. In this survey of the ancient site of the slum, the most important site identified in the catchment area of Karun Dam 4 was introduced, and based on the additional investigations, this site has been expanded nearly one hectare. The excavations of the first chapter were carried out in 13 workshops and 16 boreholes in 12000 m2 areas, that has very significant results. The width of the area, the value and historical-cultural significance of the unearthed immovable works also made the second chapter of the archaeological excavations of the slum area in 2018, in accordance with the dispersion of the works and in order to further study of the historical-cultural remains in the concentrated parts.Brief reasherches have been done to Regarding the anthropology of the mentioned region and the archaeological evidences of the Elam period in the upper Karun basin, which cannot be mentioned due to the limited space (Norouzi, 2007). Different studies done by many domestic and foreign researchers technological and pathological it has been done on metal objects with different methods that has different results. 
As it was said in spite of that there have been studies about the metal works of different ancient sites, but few studies have been done for the works of this ancient site, that are archeological mainly and for this reason doubles research is necessaly.

Conclusion
The composition of the metal/alloy used in sample K4-01 brass, sample k4-02 copper, sample k4-03 bronze and sample K4-04 silver was detected. The Sample K4-01 was made in a cycle of cold work and annealing, samples K4-02 and K4-04 were made by hot hammering or cold hammering with turning, and sample K4-03 was made by casting method. Is.
Corrosion of cuprite and malachite is well known in the samples K4-01 and K4-03. In sample K4-02 brocanthite in sample k4-04 acanthite and chloraragyrite can be detected.
The corrosion layer in the samples includes copper corrosion products along with soil compounds. In sample K4-02, intragranular corrosion and intergranular corrosion were also observed and the surface of the sample was covered with warts. Also, there are cracks on the surface of sample K4-03 due to corrosion and environmental pressure.
The phenomenon that happened in all samples is oxidation. In the samples made of copper, the amount of copper in the corrosion layer is less than of the alloy, and elements such as oxygen, chlorine, and elements related to soil have allocated a significant part of the composition of the corrosion layers. In the corrosion layer of the silver object, silver oxide is formed by increasing the amount of chlorine and oxygen.