STUDY OF MINERALIZATION, ALTERATION, AND PARAGENESIS OF Fe SKARN DEPOSIT SIMPANG TIGA, TAPAKTUAN, KABUPATEN ACEH SELATAN, NANGGROE ACEH DARUSSALAM
Iron is one of the metals that are beneficial to humans. One of the large deposits of iron ore is Fe-skarns. The research of iron ore and rocks on the Fe-deposits of skarns at Menggamat, Kluet Tengah, Aceh Selatan, using samples from the sampling channel three (CS3), aiming to know in detail the cha...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/30040 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Iron is one of the metals that are beneficial to humans. One of the large deposits of iron ore is Fe-skarns. The research of iron ore and rocks on the Fe-deposits of skarns at Menggamat, Kluet Tengah, Aceh Selatan, using samples from the sampling channel three (CS3), aiming to know in detail the characteristics of the skarn iron ore, and its minerals associations, and to predict the likely environmental impacts brought about when will be mined. The sampling method used is channel sampling along 23 m, then sample preparation, microscopic and macroscopic observation of 13 rock samples are conducted. Based on the observed minerals, rock samples are divided into 3 types: iron ore, metamorphic rocks, and altered rock. Minerals that are indicated on the microscopic observation are magnetite, hematite, pyrite, chalcopyrite, plagioclase, quartz, calcite, andalusite, sillimanite, garnet, anatase, chlorite, apatite, covellite, epidote, martite, and clays. Based on the mineralogy and texture observations can be determine the order of the paragenesis and the alteration types of the Fe-Skarn as followed. The formation of skarns begins with iso-chemical process where quartzite and marble as its evident in the location. The next phase is prograde metasomatism that occurs at high temperatures and is characterized by the garnet found in rock samples. Then retrograde phase occurs when the temperature begins to decrease and involve water meteoric, with the characteristic minerals observed are hydrous: actinolite, epidote, chlorite, sulfide minerals: pyrite and chalcopyrite, and iron oxides: hematite and magnetite. Covellite, goethite, and martite are present as an indication of weathering that occurs in the sample. |
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