Terrigenous sediment variations in the western South China Sea and their implications to East Asian monsoon evolution during the last glacial-interglacial cycle

Sang, Pham Nhu; Liu, Zhifei

doi:10.1016/j.quaint.2021.02.008

Cited by 6 publications

(6 citation statements)

References 25 publications

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“…Given that the EASM can increase the terrigenous input through river runoff (Sang & Liu, 2021), the inconsistency between EM2 proportion and K 3 -Inc, may be explained by the increase in both detrital and biogenic magnetite, which could result in the increased biogenic magnetite (higher ARM 20-100 mT ) and unchanged biogenic magnetite relative proportion (stable EM2 proportion) at 14.7-11.5 ka. In addition, this could also reflect the inherently different sensitivities to the SD and MD contribution.…”

Section: The Linkage Between Magnetofossils and The Scs Paleoenvironm...mentioning

confidence: 99%

Inverse Magnetic Fabrics Caused by Magnetofossils in the Northwestern South China Sea Since End of the Last Glacial

Wang

Gai

et al. 2022

Geophysical Research Letters

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The relationships among the abundance of magnetofossils, the ensuing magnetic properties, and the controlling paleoenvironmental factors in marine sediments remain broadly unexplored. Here, we identify magnetofossils in core XB1 from the northwestern South China Sea (SCS) since end of the Last Glacial. Using rock magnetic and electron microscopic data, we propose a model that links the anisotropy of magnetic susceptibility fabric and the abundance of magnetofossils. The magnetofossil concentration in sediments increases significantly during the 14.7–4.7 ka period, which in turns leads to inverse magnetic fabrics and near‐horizontal of the minimum magnetic susceptibility axes. Further, we show that the abundance of magnetofossils is linked to paleoenvironmental changes in the northwestern SCS. The production and preservation of magnetofossils during the 14.7–4.7 ka period are promoted by an intensified East Asian summer monsoon and sluggish deep‐water ventilation, while the paucity of magnetofossils after 4.7 ka is attributed to high oxygen content.

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Section: The Linkage Between Magnetofossils and The Scs Paleoenvironm...mentioning

confidence: 99%

Inverse Magnetic Fabrics Caused by Magnetofossils in the Northwestern South China Sea Since End of the Last Glacial

Wang

Gai

et al. 2022

Geophysical Research Letters

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“…Thêm vào nữa, khu vực Tây Nam Biển Đông nằm không gần các con sông nhỏ miền Trung Việt Nam. Chính vì những nguyên nhân này, nhiều nghiên cứu ở khu vực phía Tây Nam và phía Tây Biển Đông không quan tâm đến sự đóng góp trầm tích đến từ các con sông này 4,[6][7][8][9]11 .…”

Section: đặC đIểm Khu Vực Nghiên Cứuunclassified

“…Từ những điều trên đã chứng minh rằng, smectit và kaolinit ở khu vực Tây Nam Biển Đông có thể đều đến từ sông Mekong còn các sông ở bán đảo Sumatra, Malay, Borneo và Thái Lan cung cấp một lượng không đáng kể. Bên cạnh đó, Fu và các cộng sự 10 4,7,8,11,26,29,30,34 . Do đó, kết quả nghiên cứu của Le Duc Anh và các cộng sự 12 mâu thuẫn với hầu hết các nghiên cứu ở phía Tây Nam Biển Đông nói riêng và Biển Đông nói chung 4,8,10,11,15 .…”

Section: Thảo Luậnunclassified

“…Điều đó chứng tỏ khi các loài trùng lỗ chết đi, chúng được lắng đọng cùng với các vật liệu trầm tích từ nơi khác đưa đến. Đây cũng là lý do tại sao đồng vị kém bền 14 C trong các loài trùng lỗ được sử dụng rộng rãi để xác định tuổi trầm tích trẻ [7][8][9][10][11] . Tuy nhiên, nếu kết luận trầm tích ở khu vực này là sản phẩm phong hóa tại chỗ của đá gốc thì làm cách nào để những con trùng lỗ đã chết đi rồi chúng lại có thể tự chui xuống dưới sâu vài cm đến vài m?…”

Section: Thảo Luậnunclassified

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A review on the role of the Mekong River in contributing terrigenous sediments in the southwest East Sea

Pham Nhu,

Nguyen Huu,

Van Hoang

et al. 2022

Sci. Tech. Dev. J. - Sci. Earth Environ.

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The Mekong River is the largest river surrounding the East Sea and transports much terrigenous sediments to the southwestern East Sea. However, this region still has contained different standpoints on the sediment contribution from the Mekong River. In this study, clay mineralogy and elemental geochemistry of cores MD01-2393, MD97-2150, SO18383-3, 86GC, and KC09 from previous studies are employed to review sediment provenances in the southwestern East Sea and the role of the Mekong River in contributing terrigenous sediments in this region. According to clay mineralogy and elemental geochemistry, provenance analyses indicate that the Mekong River primarily provides terrigenous sediments to the southwestern East Sea, while rivers in Borneo, Malay, Sumatra, and Thailand can supply insignificant amounts of terrigenous sediments to this area. Based on the abundance of fine grain (silt and clay) and foraminifera in sediment cores, terrigenous sediments in the southwestern East Sea cannot be weathering products of parent rocks in the deep-sea basin, implying that these sediments could originate from remote sources. Our study reveals that the Mekong River plays the most crucial role in contributing terrigenous sediments to the southwestern East Sea.

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“…monsoon evolution, and tectonic activities (e.g., Liu et al, 2003;Liu et al, 2007b;Liu et al, 2010;Schimanski and Stattegger, 2005;Clift et al, 2006;Colin et al, 2010;Tjallingii et al, 2010;Tjallingii et al, 2014;Yan et al, 2011;Sang and Liu, 2021). The East Asian monsoon controls seasonal changes in wind patterns, temperature, and rainfall over Southeast Asia, which strongly impact the weathering process on the land, forcing significantly terrigenous sediment variations in the South China Sea (Webster, 1994;Chu and Wang, 2003;Liu et al, 2004;Liu et al, 2005;Chen et al, 2017;Sang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Chemical Weathering of the Mekong River Basin With Implication for East Asian Monsoon Evolution During the Late Quaternary: Marine Sediment Records in the Southern South China Sea

2022

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Clay mineralogy, major-element geochemistry, and Sr-Nd isotopic compositions from Core MD05-2896 collected in the southern South China Sea have been utilized to investigate the discrimination of sediment provenance and to reconstruct a history of chemical weathering in the Mekong River basin over the last 45 ka. The results display that the clay mineral assemblage of the core is characterized by abundant smectite (27%–56%) and illite (18%–32%), with moderate kaolinite (13%–23%) and chlorite (11%–18%), and the 87Sr/86Sr ratio and εNd value narrowly vary in the ranges of 0.7232–0.7272 and from –10.9 to –9.6, respectively. According to clay mineralogy and Sr-Nd isotopic compositions, the Mekong River is the main terrigenous sedimentary source to the southern South China Sea, with no detectable change over the time span of the study, despite having strong sea-level fluctuations. Clay mineralogy and elemental geochemistry analyses reveal that higher smectite/(illite + chlorite), smectite/kaolinite, TiO2/K2O, and SiO2/K2O ratios during Marine Isotope Stage (MIS) 3 and 1 suggest enhanced chemical weathering, whereas lower values of these ratios during MIS 2 indicate weakened chemical weathering. These proxies reveal a close relationship with the available climate records of the East Asian monsoon evolution, implying that the chemical weathering in the Mekong River basin has been strongly controlled by the East Asian monsoon rainfall.

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Terrigenous sediment variations in the western South China Sea and their implications to East Asian monsoon evolution during the last glacial-interglacial cycle

Cited by 6 publications

References 25 publications

Inverse Magnetic Fabrics Caused by Magnetofossils in the Northwestern South China Sea Since End of the Last Glacial

Inverse Magnetic Fabrics Caused by Magnetofossils in the Northwestern South China Sea Since End of the Last Glacial

A review on the role of the Mekong River in contributing terrigenous sediments in the southwest East Sea

Chemical Weathering of the Mekong River Basin With Implication for East Asian Monsoon Evolution During the Late Quaternary: Marine Sediment Records in the Southern South China Sea

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