Sutarto, Sutarto and Idrus, Arifudin and Putranto, Sapto and Setijadji, Lucal and Meyer, Franz Michael and Danny, Rama (2013) Veining Paragenetic Sequence of The Randu Kuning Porphyry Cu-Au Deposit At Selogiri Area, Wonogiri. In: HAGI-IAGI JOINT CONVENTION, 28-31 Octobel 2013, Medan.
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2013_ IAGI_Sutarto, et al., _Veining paragenetic sequence EXTENDED ABSTRACT.pdf Download (613kB) | Preview |
Abstract
composition intrusive rocks were found at the Randu
Kuning area and its vicinity, Selogiri, including
hornblende microdiorite, pyroxene diorite and quartz
diorite. The hydrothermal fluids which responsible for the
alteration and mineralization at the area is associated with
the occurence of the horblende microdiorite intrusion.
The alteration zone at the Randu Kuning area and
its vicinity can be divided into several hydrothermal
alteration zones, such as potassic zone (magnetite-biotite-K
feldspar), prophyllitic zone (chlorite-magnetite-epidotecarbonate),
phyllic zone (quartz-sericite-chlorite) and
argillic zones (clay mineral-sericite). The alteration pattern
in the Randu Kuning porphyry Cu-Au deposit is tipically a
diorite model characterising by the domination of potassic
alteration and prophyllitic zone. Phyllic and argillic
alteration types are restricted found within the fault zones.
A lot of porphyry vein types were found and
observed at the Randu Kuning area, and classified into at
least seven vein types. The paragenetic sequence of those
veins from the earliest to the latest respectively are 1).
Magnetite-chalcopyrite±quartz-biotite veinlets, 2).
Quartz±magnetite (A type)veins, 3). Banded/Laminated
quartz-magnetite (M type) veins, 4). Quartz±K feldspar (B
type)veins, 5). Quartz with thin centre line sulphide (AB
type) veins, 6). Pyrite±chalcopyrite (C type) veinlets, and
7). Pyrite-quartz+chalcopyrire+carbonate (D type) veins.
Gold and copper mineralisation of the Randu
Kuning Porphyry Cu-Au deposit, mostly related to the
presence of quartz veins/veinlets containing sulfide i.e.
Quartz with thin centre line sulphide veins,
Pyrite±chalcopyrite veinlets, and Pyritequartz+
chalcopyrire+carbonate veins.
Key words: porphyry, veins, paragenetic sequence
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Subjek: | Q Science > QE Geology |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Dr.Ir SUTARTO - |
| Date Deposited: | 22 Jan 2019 07:34 |
| Last Modified: | 22 Jan 2019 07:34 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/18097 |
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