Monazite age spectra in the Late Cenozoic strata of the Changjiang delta and its implication on the Changjiang run-throu

The Late Cenozoic strata are 313 m thick, revealed by the drilling core PD-99 in the south Changjiang delta. Monazite chemical dating shows that 350-500-Ma monazites predominate in the Pliocene and 100-275-Ma monazites in the Quaternary, indicating a great change of their provenance. The first presence horizon of monazites younger than 25 Ma is just above the Matruyama/Gauss boundary (~2.58 Ma), whch is exactly when uplift of the Tibetan Plateau began to influence deposition in the East China Sea. Variations in contents of monazites younger than 25 Ma can be divided into two sections. The Early-Middle Pleistocene with less <25 Ma monazites corresponds with rapid uplift of the Tibetan Plateau, and the Late Pleistocene with more <25 Ma monazites parallels the peak uplift of the Tibetan Plateau. This study demonstrates that chemical dating of monazites in the river-mouth strata is a useful method to explore changes of river drainage basins, and deconvolute multistage tectonic and magmatic activity histories in the provenance areas.

作 者： FAN Daidu LI Congxian Yokoyama Kazumi ZHOU Baochun LI Baohua WANG Qiang YANG Shouye DENG Bing WU Guoxuan   作者單位： FAN Daidu,LI Congxian,LI Baohua,YANG Shouye,DENG Bing,WU Guoxuan(State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China)

Yokoyama Kazumi(Department of Geology, National Science Museum, Tokyo, Japan)

ZHOU Baochun(Shanghai Natural Museum, Shanghai 200002, China)

WANG Qiang(Tianjin Institute of Geological and Mineral Resources, Tianjin 300170, China) 

刊 名： 中國科學D輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA SERIES D (EARTH SCIENCES)  年，卷(期)： 2005 48(10)  分類號： P3  關鍵詞： delta   monazite   electron microprobe   chemical dating   formation of the Changjiang   uplift of the Tibetan Plateau  

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