LAVANTO, AUDI TRI and Harjanto, Agus and PRABOWO, BAGUS BAYU and PETRANOVA, ANTONIO KURNIAWAN and PRADENTA, ALIFKOVAREN KUKUH LINKAGES BETWEEN VOLCANOTECTONIC SETTING, ORE-FLUID COMPOSITION, AND PRECIOUS BASE METAL PRESENCE: A UNIQUE PROSPECT OF EROSIONAL LOW SULFIDATION RELATED TO INTERMEDIATE SULFIDATION SYSTEM, AT KULON PROGO, YOGYAKARTA. MGEI.
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Abstract
Menoreh Hills is a part of the Oligo-Miosen Sunda Banda Arc (Cenozoic island arc) that saw the subduction process and generate a lot of potential areas presence precious base metals and gold deposit as in Wonogiri, Trenggalek, and Tumpangpitu. Study area is located at Kabupaten Kulon Progo, Special Region of 2 Yogyakarta Province, with geography coordinates of 110°00'00" BT - 110°15'02" BT and 7°35'00" LS - 7°50'30" LS and has 1024 km (32 km x 32 km) wide. Geology of the study area is dominated by Late Oligocene to Pliocene volcanic rocks and limestones. Stratigraphically, this area is consisting of some litologic formations, which from the oldest to the youngest are Nanggulan Formation, Kaligesing/Dukuh Formation, Jonggrangan Formation, Sentolo Formation, and Alluvial Deposits. Some intrusions of diorite, andesite, and dacite are found at the Kaligesing/Dukuh Formation. Alteration and mineralization processes have happened within the host rock of Kaligesing/Dukuh Formation, with the diorite, andesite, and dacite intrusions as the heat sources. Epithermal deposits of both vein and bulk-tonnage styles may be broadly grouped into high, intermediate, and low suldation types based on the suldation states of their hypogene sulde assemblages. The high and low suldation types may be subdivided using additional parameters, particularly related igneous rock types and metal content. Silicied quartz veins with crustiform texture were found in Plampang, Sangon and Bagelen accompanied by gold, galena, sphalerite, pyrite, chalcopyrite, molybdenite, covellite, barite, magnetite and hematite mineralization. It also found polymetallic (Zn-Pb-Cu-Au) vein deposits at plampang II and III indicating a change from low to intermediate suldation. From the geomagnetic survey shows the low magnetic value in the pattern of minerals control structure which is o o relatively NE-SW. Fluid inclusion analysis showed homogenization temperature 174,1 - 186,2 C and pressure 4,62 - 11,50 bar, based on the data it is estimated that quartz uid mineral carrier formed in Epithermal zone. The result of AAS analysis shows that metal elements are Au, Ag, Cu, Pb, Zn, As, Sb and Mo and gold content ranges from 0.10 to 0.42 ppm is in the rock while in quartz veins between 0.52 - 1.45 ppm.
| Item Type: | Other |
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| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Dr.ST,MT AGUS HARJANTO |
| Date Deposited: | 26 Mar 2019 04:24 |
| Last Modified: | 26 Mar 2019 04:24 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/18850 |
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