Uranium-lead dating of detrial zircons from the Minjiang and Jiulong Estuaries in the western coast of the Taiwan Strait: implication for its provenance

XU Yong-hang; CHEN Jian

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XU Yong-hang, CHEN Jian. Uranium-lead dating of detrial zircons from the Minjiang and Jiulong Estuaries in the western coast of the Taiwan Strait: implication for its provenance[J]. Haiyang Xuebao, 2010, 32(4): 110-117.

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Uranium-lead dating of detrial zircons from the Minjiang and Jiulong Estuaries in the western coast of the Taiwan Strait: implication for its provenance

Open Laboratory of Ocean & Coast Environmental Geology,Third Institute of Oceanography, State Oceanic Administration,Xiamen 361005,China

Received Date: 2010-01-13

Abstract

Abstract

The source information of sediments was preserved in detrital zircons,which could sufficiently interpret the provenance of sediments uranium-lead ages and trace elements in detrital zircons from the Minjiang and Jiulong Estuaries was analyzed by in situ laser ablation-multiple collector-inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). In most zircons the ratio of thorium content to uranium is higher than 0.1,indicating that zorcons have HREE-enriched feature with the positive anomaly of cerium content and the negative anomaly of europium content in chondrite-normalized REE patterns,a feature of magmatic origin. The uranium-lead ages of zircon from the Minjiang and Jiulong Estuaries can be divided into three groups: Indosinian (ca.236 Ma),Early Yanshanian (ca.155 Ma) and Late Yanshanian (ca.110 Ma). These age ranges are consistent with the ages of granitic rocks outcropped in the middle and lower reaches of the rivers. However, the uranium-lead ages of zircon from the Minjiang Estuary show distinctly Caledonian (ca.465 Ma) and Precambrian ages (553~2765Ma),which are possibly derived from the Caledonian and Precambrian rocks from upstream. In regard of similar age ranges of detrital zircons from the Minjiang Estuary and monazite from beach sands of the western Taiwan Island(Miaoli—Hsinchu,Chiayi—Tainan),the sediments of the western Taiwan Island are very likely derived from the Minjiang River.
- Taiwan Strait,
- detrital zircon,
- uranium-lead age,
- provenance

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References(42)

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