Ega Gita Prasastia(1*), Lucas Donny Setijadji(2), I Wayan Warmada(3)

(1) Department of Geological Engineering, Gadjah Mada University,
(2) Department of Geological Engineering, Gadjah Mada University,
(3) Department of Geological Engineering, Gadjah Mada University,
(*) Corresponding Author


This research objective is to identify geochemical and
mineralogical characteristics of Rare earth elements
(REE) in the weathering products of Anggi Granite, which is located in Manokwari Regency, West
Papua, Indonesia. The research is conducted on 7
samples of fresh rocks and 7 samples of weathered
rocks of Anggi Granite. The research analysis consists of petrography, XRD, XRF, and sequential extraction experiment, supported by secondary data
and references. Anggi Granite is S-type and peraluminous granite that contains zircon, monazite and
apatite as a rare earth bearing minerals. Weathering products of Anggi Granite do not have a significant enrichment of REE, even some of the samples
are depleted in REE. REE in weathered Anggi Granite are dominantly present in the primary minerals,
mostly in zircon and monazite. Extractable form
of geochemical fractions include crystalline Fe-oxide
occluded fraction (ilmenite, hematite and goethite),
and ion-exchangeable (illite, kaolin and chlorite).
Enrichment of REE in the weathered Anggi Granite is influenced by the presence of resistant REEbearing minerals, in the forms of zircon and monazite, degree of weathering related to the presence
of secondary minerals, and other factors such as pH
and Eh


Anggi Granite, REE, Weathering, Sequential extraction experiment, Geochemical fraction

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DOI: https://doi.org/10.22146/jag.26978

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