[an error occurred while processing this directive] ������� 2011, 30(2) 145-153 DOI:     ISSN: 1004-5589 CN: 22-1111/P

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Article by Chen, J. M.
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Geological characteristics and genesis of iron-copper-molybdenum deposit in Larap of Camarines Norte��Philippines
CHEN Jian-Min
No. 2 Branch of China Metallurgical Geology Bureau��Fuzhou 350001��China
Abstract:

Larap iron-copper-molybdenum deposit is formed in the island arc orogen of Luzon passive continental margin which is subducted by Philippine Plate��and located near Philippines central strike-slip fracture zone�� The mineral-bearing layer is situated on tracing fracture zone of outpouring angular uncomformity between altered andesite and breccia in upper Oligocene and hornfel and hornfel shale in Paleogene�� Large area of faded andesite and hornfel and zonal distributed grey-green hydrothermal fluid are metasomatized with altered rock series��the orebody is formed in such alteration zone with laminiplantation and lense shapes�� Iron orebody is located in upper layer�� while the copper-molybdenum ore body is located in lower layer of iron orebody together with lean magnetite�� The iron orebody associates with copper and molybdenum��the copper-molybdenum body associates with iron��gold�� silver��cobalt and others�� Magnetite is the dominant metallic mineral in the ore��secondly are pyrite��chalcopyrite�� molybdenite��pyrrhotite��uraninite��nature gold and so on�� Besides iron��copper and molybdenum��other element combinations include gold��silver��cobalt and uranium�� Compared with Olympic dam and Candelaria ( Chile) ironoxide copper-gold deposits��Larap deposit belongs to a new type of iron oxide copper-molybdenum-gold deposit��

Keywords: Philippines   Larap   geological characteristics   iron oxide copper-molybdenum deposit  
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