Sea level-controlled sediment transport to the eastern Arabian Sea over the past 600 kyr: Clay minerals and Sr Nd isotopic evidence from IODP site U1457
| Autor: | Zhaokai Xu, Serge Miska, Mitchell W Lyle, Christophe Colin, Manish Tiwari, Ravi Mishra, Huayu Lu, Shiming Wan, Annette Hahn, Anil Kumar, Peter D. Clift, Zhaojie Yu, Lina Song, Denise K. Kulhanek, Rajeev Saraswat |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010506 paleontology
Archeology Global and Planetary Change geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Indus Geochemistry Sediment Geology engineering.material 01 natural sciences Turbidite 13. Climate action Illite engineering River mouth 14. Life underwater Deccan Traps Sediment transport Ecology Evolution Behavior and Systematics Sea level 0105 earth and related environmental sciences |
| Zdroj: | Quaternary Science Reviews. 205:22-34 |
| ISSN: | 0277-3791 |
| Popis: | Long marine sequences deposited in the Arabian Sea are suitable to study the orbital sensitivity of sediment dynamics from a source-to-sink perspective. The clay mineralogy and Sr Nd isotopic compositions have been analyzed for the detrital fraction of sediments from IODP Site U1457 located in the Laxmi basin, eastern Arabian Sea to constrain the sediment sources and reconstruct a high-resolution record of sediment export to the Indus deep-sea fan over the past 600 kyr. The 87Sr/86Sr ratio (varying from 0.7154 to 0.7255) and eNd (varying from −12.9 to −9.5) imply a mixing of sediments derived from not only the Indus River but also the rivers draining the Deccan Traps. The variations in the smectite/(illite + chlorite) ratio combined with Sr Nd isotopes permit the reconstruction of past changes in the relative proportions of sediments derived from the Indus River (mainly illite, chlorite and kaolinite) and the Deccan Traps (smectite). The wavelet and cross-spectral analyses further reveal that sediment transport to the eastern Arabian Sea since 600 kyr is mainly dominated by sea-level variations in the eccentricity (100-kyr) band, while the Indian summer monsoon might contribute moderately to the precession (23-kyr) band. The eNd and turbidite frequency indicate that more turbidite events are associated with Indus River-sourced sediments at IODP Site U1457 during sea-level lowstands, which might reflect a reconnection of deep-sea channels to the Indus River mouth and/or reworking of previously deposited Indus River sediments located northward. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect