气候变化领域集成服务门户(CCPortal): Late Cretaceous to recent ocean-bottom currents in the SW Pacific Gateway; southeastern Chatham Rise; New Zealand

CCPortal

DOI	10.1016/j.palaeo.2020.109633
	Late Cretaceous to recent ocean-bottom currents in the SW Pacific Gateway; southeastern Chatham Rise; New Zealand
	Steinbrink L.; Gohl K.; Riefstahl F.; Davy B.; Carter L.
发表日期	2020
ISSN	0031-0182
卷号	546
英文摘要	Sedimentary drifts archive the history of the ocean-bottom current dynamics. Bottom currents associated with the Pacific Deep Western Boundary Current (DWBC) along the submarine continental margin off southern and eastern New Zealand are of particular interest because of their potential to contain records of changes in the SW Pacific circulation. Analysis of multi-channel seismic reflection data from the RV Sonne expedition SO246 together with earlier seismic data enabled us to reconstruct bottom currents and map sediment deposits along the southeastern Chatham Rise margin for the past 80 million years. The seismic records are supplemented by sub-bottom profiler and bathymetric data, which provide detailed information on the youngest stratigraphy, sedimentary structures and bathymetry. This approach allows time-dependent mapping of sedimentary deposits and reconstruction of current regimes. The opening of the Tasmanian Gateway in the early Oligocene led to the development of the DWBC, which influenced regional sedimentary processes. However, the occurrence of bottom current activity prior to opening the Tasmanian Gateway suggests the existence of a proto-DWBC. Increased bottom current activity in the Miocene indicates a change to a more dynamic circulation regime in the SW Pacific, consistent with intensification of Antarctic glaciation and increased Antarctic Bottom Water formation. Plio/Pleistocene records indicate a weakening of the bottom-water energy along the Chatham Rise margin. Overall, sediment deposition was widespread before gateway opening, almost non-existent in the Oligocene and sparse in the Neogene. © 2020 The Authors
英文关键词	Contourites; Deep Western Boundary Current; Marshall Paraconformity; Sediment drifts; Tasmanian Gateway
语种	英语
scopus关键词	bottom current; continental margin; contourite; Cretaceous; deposition; ocean; reconstruction; sediment transport; seismic data; seismic reflection; western boundary current; Chatham Rise; New Zealand; Pacific Ocean; Pacific Ocean (Southeast)
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150546
作者单位	Alfred Wegener Institute Helmholtz-Centre for Polar and Marine Research, Bremerhaven, Germany; GNS Science, Lower Hutt, New Zealand; Victoria University Wellington, Wellington, New Zealand
推荐引用方式 GB/T 7714	Steinbrink L.,Gohl K.,Riefstahl F.,et al. Late Cretaceous to recent ocean-bottom currents in the SW Pacific Gateway; southeastern Chatham Rise; New Zealand[J],2020,546.
APA	Steinbrink L.,Gohl K.,Riefstahl F.,Davy B.,&Carter L..(2020).Late Cretaceous to recent ocean-bottom currents in the SW Pacific Gateway; southeastern Chatham Rise; New Zealand.Palaeogeography, Palaeoclimatology, Palaeoecology,546.
MLA	Steinbrink L.,et al."Late Cretaceous to recent ocean-bottom currents in the SW Pacific Gateway; southeastern Chatham Rise; New Zealand".Palaeogeography, Palaeoclimatology, Palaeoecology 546(2020).