Journal
GEOLOGICAL MAGAZINE
Volume 157, Issue 6, Pages 908-919Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0016756818000857
Keywords
Arabian Sea; clay minerals; Deccan Traps; Indian summer monsoon; Indus River; International Ocean Discovery Program; IODP Site U1456
Categories
Funding
- National Natural Science Foundation of China [41676038, 41876034]
- Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology [2016ASKJ13]
- National Special Project for Global Change and Air-Sea Interaction [GASI-GEOGE-02, GASI-GEOGE-04, GASI-GEOGE-06-02]
- NSFC-Shandong Joint Fund for Marine Science Research Centers [U1606401]
- strategic Priority Research Program of the Chinese Academy of Sciences [XDA11030104]
- National Research Foundation of Korea [2016K2A9A2A08003704, 2016R1A2B4008256]
- Korea Institute of Ocean Science Technology [PE99606]
- Shandong Provincial Natural Science Foundation, China [ZR2016DM12]
- Korea Institute of Marine Science & Technology Promotion (KIMST) [PE99606] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We present a new set of clay mineral and grain-size data for the siliciclastic sediment fraction from International Ocean Discovery Program (IODP) Site U1456 located in the eastern Arabian Sea to reconstruct the variabilities in the continental erosion and weathering intensity in the western Himalaya, elucidate the sediment source-to-sink processes and discuss the potential controls underlying these changes since 3.7 Ma. The clay minerals mainly consist of smectite (0-90%, average 44%) and illite (3-90%, average 44%), with chlorite (1-26%, average 7%) and kaolinite (0-19%, average 5%) as minor components. The compositional variations in the clay minerals at IODP Site U1456 suggest four phases of sediment provenance: the Indus River (phase 1, 3.7-3.2 Ma), the Indus River and Deccan Traps (phase 2, 3.2-2.6 Ma), the Indus River (phase 3, 2.6-1.2 Ma) and the Indus River and Deccan Traps (phase 4, 1.2-0 Ma). These provenance changes since 3.7 Ma can be correlated with variations in the Indian summer monsoon intensity. The siliciclastic sediments in the eastern Arabian Sea were mainly derived from the Indus River when the Indian summer monsoon was generally weak. In contrast, when the Indian summer monsoon intensified, the siliciclastic sediment supply from the Deccan Traps increased. In particular, this study shows that the smectite/(illite+chlorite) ratio is a sensitive tool for reconstructing the history of the variation in the Indian summer monsoon intensity over the continents surrounding the Arabian Sea since 3.7 Ma.
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