沙捞越古晋地区伦杜基性岩的形成时代、地球化学特征及其地质意义

房旭东; 张爱梅; 王岳军; 胡祥云; 钱鑫; 何慧莹; 陈敏

doi:10.3799/dqkx.2020.048

Volume 46 Issue 6

Jun. 2021

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Fang Xudong, Zhang Aimei, Wang Yuejun, Hu Xiangyun, Qian Xin, He Huiying, Chen Min, 2021. Geochronoloy and Geochemical Characteristics of Lundu Mafic Rocks in Kuching Area, Sarawak. Earth Science, 46(6): 2133-2144. doi: 10.3799/dqkx.2020.048

Citation:

Fang Xudong, Zhang Aimei, Wang Yuejun, Hu Xiangyun, Qian Xin, He Huiying, Chen Min, 2021. Geochronoloy and Geochemical Characteristics of Lundu Mafic Rocks in Kuching Area, Sarawak. Earth Science, 46(6): 2133-2144. doi: 10.3799/dqkx.2020.048

Citation:

Fang Xudong, Zhang Aimei, Wang Yuejun, Hu Xiangyun, Qian Xin, He Huiying, Chen Min, 2021. Geochronoloy and Geochemical Characteristics of Lundu Mafic Rocks in Kuching Area, Sarawak. Earth Science, 46(6): 2133-2144. doi: 10.3799/dqkx.2020.048

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Geochronoloy and Geochemical Characteristics of Lundu Mafic Rocks in Kuching Area, Sarawak

doi: 10.3799/dqkx.2020.048

Fang Xudong^{1, 2
,
,},
Zhang Aimei^{1
,
,},
Wang Yuejun³,
Hu Xiangyun²,
Qian Xin³,
He Huiying³,
Chen Min¹

1.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
2.
Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan 430074, China
3.
School of Earth Science and Geological Engineering, Sun Yat-Sen University, Guangzhou 510275, China

Received Date: 2019-11-21
Publish Date: 2021-06-15

Abstract

Abstract

Kalimantan Island is the largest island in the south of South China Sea that has undergone complex tectonic evolution, resulting from convergence of the Indian-Australian, Pacific and Philippine Sea plates. The Kuching area of Kalimantan Island has a series of Late Cretaceous magmatic rocks, but the distribution of basic rocks is less. The petrogenesis of basic rocks is significant to reveal the tectonic framework and evolution history in that period. In this study, it presents new petrographic, geochronological and geochemical data for the Lundu gabbroic pluton in the Kuching area. The basic rocks are predominantly made of dolerite and gabbro. Zircon U-Pb dating result shows that the crystallization age of the gabbro is 83.4±0.9 Ma, suggesting that the basic rocks intruded in the Late Cretaceous. These samples have low SiO₂ ranging from 52.01% to 52.38%, K₂O from 0.37% to 0.53% and TiO₂ ranging from 0.81% to 0.92% with high Al₂O₃ of 14.00%-14.54% and MgO of 7.40%-7.86%. These samples are geochemically characterized by enrichment of light rare earth elements (LREE) and large-ion lithophile elements (LILE) and flat distribution of heavy rare earth elements (HREE) with light low REE abundance (∑REE=43.96×10^-6-48.19×10^-6). The representative samples show low initial ⁸⁷Sr/⁸⁶Sr ratios (0.705 1 to 0.705 3) and positive ε_Nd(t) values (2.1 to 3.3). Combination of trace elemental and isotopic results suggest that the parental magmas were likely derived from the mantle source modified by subduction-related fluid and sediments in the back-arc basin tectonic setting in the response of the subduction of the Paleopacific plate, and may link with Southeast China, Hainan island and Vietnam.
- Lundu mafic rock,
- LA-ICP-MS zircon U-Pb dating,
- E-MORB,
- back-arc basin,
- subduction of Paleopacific,
- petrology

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Geochronoloy and Geochemical Characteristics of Lundu Mafic Rocks in Kuching Area, Sarawak

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