The Age and Origin of the Ruwai Polymetallic Skarn Deposit, Indonesia: Evidence of Cretaceous Mineralization in the Central Borneo Metallogenic Belt

Dana, Cendi D.P. and Agangi, Andrea and Idrus, Arifudin and Chelle-Michou, Cyril and Lai, Chun-Kit and Ishida, Mizuki and Guillong, Marcel and González-Álvarez, Ignacio and Takahashi, Ryohei and Yano, Moei and Mimura, Kazuhide and Ohta, Junichiro and Kato, Yasuhiro and Simbolon, Doly R. and Xia, Xiao-Ping (2023) The Age and Origin of the Ruwai Polymetallic Skarn Deposit, Indonesia: Evidence of Cretaceous Mineralization in the Central Borneo Metallogenic Belt. Economic Geology, 118 (6). 1341 – 1370. ISSN 03610128

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Abstract

The Ruwai skarn deposit is the largest polymetallic skarn deposit in Borneo and is located in the Schwaner Mountains. The skarns and massive orebodies are hosted in marble of the Jurassic Ketapang Complex, which was intruded by Cretaceous Sukadana granitoids. The prograde-stage garnet and retrograde-stage titanite yielded U-Pb ages of 97.0 ± 1.8 to 94.2 ± 10.3 Ma and 96.0 ± 2.9 to 95.0 ± 2.0 Ma, respectively. These ages are similar to Re-Os ages obtained on sulfides (96.0 ± 2.3 Ma) and magnetite (99.3 ± 3.6 Ma). The U-Pb zircon ages reveal that magmatism at Ruwai occurred in three phases, including the Early Cretaceous (ca. 145.7 and 106.7–105.7 Ma; andesite-dacite), Late Cretaceous (ca. 99.7–97.1 Ma; diorite-granodiorite), and late Miocene (ca. 10.94–9.51 Ma; diorite-dolerite). Based on geochemical and stable isotopic data (C-O-S) the Ruwai skarn ores are interpreted to have formed from oxidized fluids at ca. 160 to 670°C. The ore-forming fluids and metals were mostly magmatic in origin but with significant crustal input. Ruwai skarn mineralization occurred in the Late Cretaceous, associated with Paleo-Pacific subduction beneath Sundaland after the Southwest Borneo accretion. Ruwai is the first occurrence of Cretaceous mineralization recognized in the Central Borneo metallogenic belt. © 2023 Society of Economic Geologists, Inc. All rights reserved.

Item Type: Article
Additional Information: Cited by: 4; All Open Access, Hybrid Gold Open Access
Uncontrolled Keywords: Borneo; Indonesia; Sukadana; West Kalimantan; Binary alloys; Lead alloys; Magnetite; Mineralogy; Osmium alloys; Rhenium alloys; Rhenium compounds; Sulfur compounds; Uranium alloys; Zircon; Granitoids; Indonesia; Jurassic; Late cretaceous; Metallogenic belt; Mineralisation; Orebodies; Polymetallic; Re-Os ages; U-Pb ages; garnet; magmatism; metallogenesis; mineralization; ore-forming fluid; skarn; stable isotope; subduction; Deposits
Subjects: Q Science > QE Geology
Divisions: Faculty of Engineering > Geological Engineering Department
Depositing User: Sri JUNANDI
Date Deposited: 07 Nov 2024 01:10
Last Modified: 07 Nov 2024 01:10
URI: https://ir.lib.ugm.ac.id/id/eprint/10747

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