GEOCHEMISTRY OF RARE EARTH ELEMENTS IN A CORE FROM MARIANA TRENCH AND ITS SIGNIFICANCE

WANG Fenlian; HE Gaowen; WANG Haifeng; REN Jiangbo

doi:10.16562/j.cnki.0256-1492.2016.04.008

Marine Geology & Quaternary Geology > 2016 > 36(4): 67-75. > DOI: 10.16562/j.cnki.0256-1492.2016.04.008

WANG Fenlian, HE Gaowen, WANG Haifeng, REN Jiangbo. GEOCHEMISTRY OF RARE EARTH ELEMENTS IN A CORE FROM MARIANA TRENCH AND ITS SIGNIFICANCE[J]. Marine Geology & Quaternary Geology, 2016, 36(4): 67-75. DOI: 10.16562/j.cnki.0256-1492.2016.04.008

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GEOCHEMISTRY OF RARE EARTH ELEMENTS IN A CORE FROM MARIANA TRENCH AND ITS SIGNIFICANCE

1. Sun Yat-sen University, School of Marine Science, Guangzhou 510006;
2. MLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou 510075

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Received Date: December 09, 2015
Revised Date: February 23, 2016

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Abstract

Abstract

The lithology, grain-size, clay minerals and rare earth elements (REE) of sediments from the core named JL7KGC01A, collected by "JiaoLongHao" from the Pacific Ocean, south of the Mariana Trench, are analyzed for the first time. The results show that the sample is a sort of typical pelagic clay. According to its granularity, clay minerals, REE contents, δCe and δEu values, the core can be divided to lower(1.8-2.41 m) and upper sections(0.03-1.8 m). Sediments from the lower section are coarser in grain-size, with higher M/I value (montmorillonite/illite), lower REE value, slightly negative Ce and Eu anomalies compared to the upper section, indicating that the lower section hosts more volcanic materials. According to the mineralogy, REE geochemistry and chronological data in hand, we believe that the sediments were mainly from nearby volcanic eruptives earlier than 2.2 Ma. However, the terrigenous materials played an increasingly important role in the sediments later than 2.2 Ma. The change in source of the sediments may indicate frequent volcanic activities in the Mariana before 2.2 Ma.
- REE,
- sediments,
- source,
- Mariana Trench

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References (28)

References

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GEOCHEMISTRY OF RARE EARTH ELEMENTS IN A CORE FROM MARIANA TRENCH AND ITS SIGNIFICANCE