ALTERATION AND MINERALIZATION OF ANCIENT CALDERA IN CUPUNAGARA, SUBANG, WEST JAVA

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32^nd HAGI, The 36^th IAGI, and The 29^th IATMI Annual Conference and Exhibition

ALTERATION AND MINERALIZATION OF ANCIENT CALDERA IN CUPUNAGARA, SUBANG, WEST JAVA

Sugeng S Surjono 1 & Mohd. Shafeea Leman²

¹Geological Engineering Department, Faculty of Engineering,
Gadjah Mada University, INDONESIA
²School of Environmental Science and Natural Resources,
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, MALAYSIA

ABSTRACT

Low grade metamorphic rocks including slate, phyllite, metaquartzite with subordinate schist and quartzite are widely distributed in East Johor. Regionally, this rock unit is extended northward up to northern Terengganu area. The protolith of this rocks unit was deposited in shallow marine depositional environment that subsequently metamorphosed during Carboniferous time. The very thick argillaceous and arenaceous rocks more than 5000 metres were produced by fast rate accommodation spaces due to global sea level rise during Early to Late Carboniferous against high fine-grained sediment supply. Tectonic setting, basin formation and sedimentation processes were controlled by rifting of Indochina- East Malaya continental block from Gondwanaland during Devonian to Late Carboniferous. This rifting formed basins within a passive margin tectonic setting along western margin of Indochina-East Malaya continental block.