DOI: 10.1016/j.epsl.2021.116870
论文题名: Event-dominated transport, provenance, and burial of organic carbon in the Japan Trench
作者: Schwestermann T. ; Eglinton T.I. ; Haghipour N. ; McNichol A.P. ; Ikehara K. ; Strasser M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563 语种: 英语
中文关键词: carbon isotopes
; carbon provenance
; carbon transfer
; hadal zone event-stratigraphy
; Japan Trench
; ramped Pyr/Ox
英文关键词: Deposits
; Ocean currents
; Storms
; Stratigraphy
; Surficial sediments
; Thermooxidation
; Carbon isotopes
; Carbon provenance
; Carbon transfer
; Deep trench
; Event deposits
; Hadal zone event-stratigraphy
; Japan trench
; Organics
; Ramped pyr/ox
; Study sites
; Organic carbon
; carbon cycle
; carbon isotope
; hadal zone
; organic carbon
; organic matter
; oxidation
; provenance
; sediment core
; sequence stratigraphy
; submarine canyon
; transport process
; Japan Trench
; Pacific Ocean
英文摘要: The delivery of organic carbon (OC) to the ocean's deepest trenches in the hadal zone is poorly understood, but may be important for the carbon cycle, contain crucial information on sediment provenance and event-related transport processes, and provide age constraints on stratigraphic sequences in this terminal sink. In this study, we systematically characterize bulk organic matter (OM) and OC signatures (TOC/TN, δ13C, 14C), as well as those from application of serial thermal oxidation (ramped pyrolysis/oxidation) of sediment cores recovered along an entire hadal trench encompassing high stratigraphic resolution records spanning nearly 2000 years of deposition. We analyze two cores from the southern and northern Japan Trench, where submarine canyon systems link shelf with trench. We compare results with previously published data from the central Japan Trench, where canyon systems are absent. Our analyses enable refined dating of the stratigraphic record and indicate that event deposits arise from remobilization of relatively surficial sediment coupled with deeper erosion along turbidity current pathways in the southern and central study site and from canyon flushing events in the northern study site. Furthermore, our findings indicate deposition of predominantly marine OC within hemipelagic background sediment as well as associated with event deposits along the entire trench axis. This implies that canyon systems flanking the Japan Trench do not serve as a short-circuit for injection of terrestrial OC to the hadal zone, and that tropical cyclones are not major agents for sediment and carbon transfer into this trench system. These findings further support previous Japan Trench studies interpreting that event deposits originate from the landward trench slope and are earthquake-triggered. The very low terrestrial OC input into the Japan Trench can be explained by the significant distance between trench and hinterland (>180 km), and the physiography of the canyons that do not connect to coast and river systems. We suggest that detailed analyzes of long sedimentary records are essential to understand OC transfer, deposition and burial in hadal trenches. © 2021 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165666
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck, 6020, Austria; Geological Institute, ETH Zürich, Sonneggstrasse 5, Zürich, 8092, Switzerland; Laboratory of Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, Zürich, 8093, Switzerland; Woods Hole Oceanographic Institution, National Ocean Sciences Accelerator Mass Spectrometry Facility, Woods Hole, MA 02543-1539, United States; Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 7, 1-1-1 Higashi, Tsukuba, 305-8567, Japan; MARUM – Center for Marine Environmental Sciences, University of Bremen, Leobener Str. 8, Bremen, 28359, Germany
Recommended Citation:
Schwestermann T.,Eglinton T.I.,Haghipour N.,et al. Event-dominated transport, provenance, and burial of organic carbon in the Japan Trench[J]. Earth and Planetary Science Letters,2021-01-01,563