The Age and Origin of the Ruwai Polymetallic Skarn Deposit, Indonesia: Evidence of Cretaceous Mineralization in the Central Borneo Metallogenic Belt
The Age and Origin of the Ruwai Polymetallic Skarn Deposit, Indonesia: Evidence of Cretaceous Mineralization in the Central Borneo Metallogenic Belt
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DOI：
10.5382/econgeo.5009
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发表时间：
2023-05
期刊：
影响因子：
5.8
通讯作者：
C. Dana;A. Agangi;A. Idrus;C. Chelle-Michou;Chunkit Lai;Mizuki Ishida;M. Guillong;I. González-Álvarez;R. Takahashi;Moei Yano;K. Mimura;J. Ohta;Y. Kato;D. Simbolon;X. Xia
中科院分区：
文献类型：
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作者：
C. Dana;A. Agangi;A. Idrus;C. Chelle-Michou;Chunkit Lai;Mizuki Ishida;M. Guillong;I. González-Álvarez;R. Takahashi;Moei Yano;K. Mimura;J. Ohta;Y. Kato;D. Simbolon;X. Xia
Ruwai矽卡岩存款是婆罗洲最大的多金属矽卡岩存款，位于Schwaner山脉。矽卡岩和块状矿体赋存于侏罗纪Ketapang杂岩的大理石中，该杂岩被白垩纪Sukadana花岗岩类侵入。石榴子石和退变质钛铁矿的U-Pb年龄分别为97.0 ± 1.8 ~ 94.2 ± 10.3Ma和96.0 ± 2.9 ~ 95.0 ± 2.0Ma。这些年龄与硫化物（96.0 ± 2.3Ma）和磁铁矿（99.3 ± 3.6Ma）的Re-Os年龄相似。锆石U-Pb年龄表明，汝外岩浆活动分三期进行，即早白垩世（约1000年）、晚白垩世（约1000年）和晚白垩世（约1000年）。145.7和106.7-105.7 Ma;安山岩-英安岩），晚白垩世（约。99.7-97.1 Ma;闪长岩-花岗闪长岩）和晚中新世（约。10.94- 9.51Ma;闪长岩-粗玄岩）。根据地球化学和稳定同位素（C-O-S）数据，鲁外矽卡岩矿石被解释为形成于约2000年的氧化流体。160至670°C。成矿流体和金属主要来源于岩浆，但也有大量地壳输入。Ruwai矽卡岩成矿作用发生在晚白垩世，与西南婆罗洲增生后的古太平洋俯冲作用有关。Ruwai是在中婆罗洲成矿带中发现的第一个白垩纪矿化。
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.