MICROSTRUCTURE AND MINERALIZATION IN AIR MONYET SHEAR ZONE, TANJUNG GUNUNG VILLAGE, CENTRAL BANGKA REGION, BANGKA BELITUNG PROVINCE
The research conducted in Air Monyet, one of of PT. Timah (Persero) Tbk concession area with primary tin prospect. Research area located in Pangkalan Baru district, Central Bangka Region, Bangka Belitung province within coordinat 631444 – 633534 mE and 9756803-9758880 mN. The research area is cha...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/37297 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The research conducted in Air Monyet, one of of PT. Timah (Persero) Tbk
concession area with primary tin prospect. Research area located in Pangkalan Baru
district, Central Bangka Region, Bangka Belitung province within coordinat 631444
– 633534 mE and 9756803-9758880 mN. The research area is characterized with
old geomorphic stage with intrusion hills and denudational landform. The results
from geological mapping shows that area consist of Sandstone as the oldest rock unit
from Triassic age and intruded by Granite in Jurrasic. Deformation in research area
are brittle and ductile shear zone. The ductile shear zone formed in two different
stage followed by brittle shear zone. The oldest ductile shear zone formed in four
parallel segment of symmetric shearzone (SZAM I) oriented in northwest –
southeast, and the second ductile shear zone formed in asymmetric shear zone
(SZAM II) oriented in west northwest – east southeast. Deformation bands, shear
fractures, and joints is the main structure that develop in outer ductile shear zone.
Planar cleavage, shearband cleavage, continious cleavage is main structure
developed within ductile shear zone. Progressive deformation from each ductile
shear zone was done with microstructure study and it shows that the increasing of
phyllosilicate and oxide element with the development of clevage domain.
Deformation mechanism that controlled the deformation is pressure solution and
intracrystalin deformation. Progressive deformation in brittle and ductile shear zone
induced dilation site in form of vein. In brittle shear zone, vein was found infill shear
fracture, join and conduit in dextral fault segment. In ductile shear zone vein was
found in form of shear and extensional vein in Sandstone unit, pegmatite and
tourmaline nodule in Granit. |
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