جهت شناسايي زون هاي ASTER پردازش و تفسير داده هاي سنجنده دگرساني مرتبط با كانسار مس پورفيري دره زرشك، واقع در جنوب غرب شهر يزد

Analyzing an Interpretation of ASTER for recognition of hydrothermally altered areas associated with Darezereshk porphyry copper deposit, Located in southwest of Yazd

ﻣﻨﻄﻘﻪ ﺟﻨﻮب ﻏﺮب ﺷﻬﺮ ﯾﺰد ﺑﻪ ﻟﺤﺎظ زﻣﯿﻦ ﺷﻨﺎﺳﯽ و ﮐﺎﻧﻪ زاﯾﯽ ﯾﮑﯽ از ﻣﻨﺎﻃﻘﯽ ﻣﺤﺴﻮب ﻣﯽ ﮔﺮدد ﮐﻪ ﻫﻤﻮاره در اوﻟﻮﯾﺖ ﮐﺎرﻫﺎي اﮐﺘﺸﺎﻓﯽ ﻗﺮار داﺷﺘﻪ اﺳﺖ. ﮐﺎﻧﺴﺎر ﻣﺲ ﭘﻮرﻓﯿﺮي دره زرﺷﮏ واﻗﻊ در ﺟﻨﻮب ﻏﺮب ﺷﻬﺮ ﯾﺰد ﺑﺮ روي ﯾﮑﯽ از زون ﻫﺎي ﺗﮑﺘﻮﻧﯿﮑﯽ و ﻓﻌﺎل اﯾﺮان ﻣﺮﮐﺰي ﺑﻪ ﻧﺎم زون اروﻣﯿﻪ دﺧﺘﺮ واﻗﻊ ﺷﺪه اﺳﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﯾﻨﮑﻪ دﮔﺮﺳﺎﻧﯽ ﺑﻪ ﻋﻨﻮان ﯾﮑﯽ از ﺷﺎﺧﺺ ﻫﺎي اﮐﺘﺸﺎﻓﯽ ﺷﻨﺎﺧﺘﻪ ﻣﯽ ﺷﻮد، ﺷﻨﺎﺧﺖ اﯾﻦ ﻣﻨﺎﻃﻖ ﻣﯽ ﺗﻮاﻧﺪ ﺟﻬﺖ ﻋﻤﻠﯿﺎت اﮐﺘﺸﺎﻓﯽ در ﻣﻘﯿﺎس ﻧﺎﺣﯿﻪ اي ﺑﺴﯿﺎر ﻣﻔﯿﺪ واﻗﻊ ﺷﻮد. ﻫﺪف از اﯾﻦ ﺗﺤﻘﯿﻖ، ﺗﻌﯿﯿﻦ ﻣﺤﺪوده ﻫﺎي دﮔﺮﺳﺎﻧﯽ در ارﺗﺒﺎط ﺑﺎ ﮐﺎﻧﯽ ﺳﺎزي ﻣﺲ ﭘﻮرﻓﯿﺮي ﺑﺎ اﺳﺘﻔﺎده از روش دورﺳﻨﺠﯽ ﻣﯽ ﺑﺎﺷﺪ. ﺑﻪ اﯾﻦ ﻣﻨﻈﻮر ﺑﺮ روي ﺗﺼﺎوﯾﺮ ﻣﺎﻫﻮاره اي ﺗﺼﺤﯿﺤﺎت ﻻزم اﻋﻤﺎل ﺷﺪ و ﭘﺲ از آن ﭘﺮدازش ﻫﺎي ﺑﻌﺪي ﺑﺮاي ﺗﺼﺎوﯾﺮ ﺗﺼﺤﯿﺢ ﺷﺪه ﺻﻮرت ﮔﺮﻓﺖ. در اﯾﻦ ﺗﺤﻘﯿﻖ از روش ﻫﺎي ﻣﺨﺘﻠﻒ ﭘﺮدازش ﺗﺼﻮﯾﺮ از ﺟﻤﻠﻪ ﺳﺎﺧﺖ ﺗﺮﮐﯿﺒﺎت ﮐﺎذب رﻧﮕﯽ، آﻧﺎﻟﯿﺰ ﻣﺆﻟﻔﻪ ﻫﺎي اﺻﻠﯽ اﺳﺘﺎﻧﺪارد، روش ﮐﺮوﺳﺘﺎ و ﮐﻤﺘﺮﯾﻦ ﻣﺮﺑﻌﺎت رﮔﺮﺳﯿﻮن ﺷﺪه اﺳﺘﻔﺎده ﺷﺪ و در ﭘﺎﯾﺎن دﮔﺮﺳﺎﻧﯽ ﻫﺎي ﻋﻤﺪه ﻣﻨﻄﻘﻪ آﺷﮑﺎر ﺷﺪﻧﺪ. در اﯾﻦ ﺗﺤﻘﯿﻖ از داده ﻫﺎي ﺳﻨﺠﻨﺪه ASTER ﺑﻪ ﻣﻨﻈﻮر ﻧﻘﺸﻪ ﺑﺮداري ﻣﻨﺎﻃﻖ دﮔﺮﺳﺎن ﺷﺪه در ﻣﻨﻄﻘﻪ ﺟﻨﻮب ﻏﺮب ﯾﺰد اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ.

Southwest of Yazd is one of the areas which has always been in the high priority of exploration from the aspects of geology and mineralogy. Darezereshk porphyry copper ore deposit located in southwest of Yazd in over one of tectonic and active zones of central Iran called Urumieh-Dokhtar. Alteration zone are very important in deposits exploration. The aim of this research is the use of remote sensing methods for identification of the alteration zones associated with porphyry copper mineralization. In order to achieve this aim, geometric, radiometric and other corrections were done on the image(ASTER), and further analysis were carried out on the corrected images. In this research, different image processing teqhniques such as false composites, principal component analysis, Crosta technique and Ls-Fit have been used. Finally the dominant alterations in the study area were detected.