Paleoenvironmental evolution in the Guaymas Basin over the past 350 ka based on X-ray fluorescence scanning of sediment cores

DU linfen; SHI Lu; HUA Chunrong; WANG Yasu; JIANG Shijun

doi:10.16562/j.cnki.0256-1492.2024072701

Marine Geology & Quaternary Geology > 2025 > Corrected proof > DOI: 10.16562/j.cnki.0256-1492.2024072701

DU linfen，SHI Lu，HUA Chunrong，et al. Paleoenvironmental evolution in the Guaymas Basin over the past 350 ka based on X-ray fluorescence scanning of sediment cores[J]. Marine Geology & Quaternary Geology，xxxx，x(x)： x-xx. DOI: 10.16562/j.cnki.0256-1492.2024072701

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Paleoenvironmental evolution in the Guaymas Basin over the past 350 ka based on X-ray fluorescence scanning of sediment cores

DU linfen^1,,
SHI Lu²,
HUA Chunrong²,
WANG Yasu^{3, 4, ,},
JIANG Shijun^{3, 4}

1.
College of Oceanography, Hohai University, Nanjing 210024, China
2.
Arun Banner No.2 Middle School, Hulunbuir1 62750, China
3.
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228, China
4.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China

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Received Date: July 26, 2024
Revised Date: February 11, 2025
Accepted Date: February 11, 2025
Available Online: March 25, 2025

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Abstract

Abstract

X-ray fluorescence (XRF) core scanning on marine sediments has been widely utilized in reconstructing changes in ancient ocean and climate. However, the current XRF core scanning conducted by the International Ocean Discovery Program (IODP) only provides elemental counts, which does not meet the requirements for elemental concentration in paleoceanography. This study takes the XRF core scanning data from Site U1546 of IODP Expedition 385 in the Guaymas Basin as an example. By combining the XRF measured elemental contents of discrete sediment samples and a reference material, the relationships between concentrations and counts of various elements were obtained, allowing the conversion of elemental counts from raw XRF scanning data into concentrations. Based on the previously established age model for Site U1546, various proxies such as Ti/Al, K/Al, K/Ti, Ti/Ca, Fe/Ca, Sr/Ca, and Zn/Al were utilized to reconstruct the continental weathering intensity, terrigenous input, oceanic nutrient conditions, and primary productivity in the Guaymas Basin since the middle Pleistocene (since 350 ka). Results indicate that the continental weathering intensity shows a generally periodic change, being weaker during glacial periods and stronger during interglacial periods. Terrigenous input, nutrient availability and primary productivity fluctuated significantly between 350 and 130 ka and increased slowly since 130 ka. Nutrient availability and primary productivity were positively correlated with terrigenous input, suggesting a possible terrestrial control. This study revealed the changing patterns of continental surface weathering intensity, terrigenous material input, and marine nutrition and primary productivity in the Guaymas Basin since the Middle Pleistocene, providing an important scientific basis for further exploring the response of ancient marine environmental evolution to climate change.
- Sediment,
- X-ray fluorescence,
- elemental concentration,
- International Ocean Discovery Program Expedition 385,
- Guaymas Basin

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References (60)

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