Millennial and centennial variations in zircon U‐Pb ages in the quaternary indus submarine canyon

• DOI: 10.1111/bre.12313
• Publication Date: 2018-09-04T16:24:00Z
• Authors: Yuting Li; Peter D. Clift; Paul O'Sullivan
• Keywords: Submarine canyon; Sedimentary budget; Indus

Abstract Use of deep‐water sediments in submarine fans to reconstruct changing erosion onshore is based on the premise relatively simple transport between source and sink. However, debate continues regarding degree sediment buffering recycling process. In this study, we investigate origin Indus Submarine Canyon since Last Glacial Maximum ( LGM ; ~20 ka) using zircon U‐Pb dates. Zircon grains canyon are resolvably different from those at river mouth, least before 6.6 ka, implying a disconnection mouth up that time. Sand may be stored near as sea level rose, while finer‐grained was directly transferred into deeper water. Since 1 ka upper has shown big rapid provenance changes, most notably sharp increase Nanga Parbat, whose influence minor modern river. Such changes imply lack recent past. The contrasts with terms its age populations influenced by significant anthropogenic impact terrestrial drainage basin, especially damming.