Late quaternary glacial cycle and precessional period of clay mineral assemblages in the western pacific warm pool

Abstract

Variability of clay mineral assemblages in the Western Pacific Warm Pool (WPWP) over the past 370 ka shows the prominent glacial-interglacial cyclicity. Smectite (62%-91%) is the dominant clay mineral, with decreased contents during interglacials while increased in glacials. In contrast, variations in chlorite (4%-21%), illite (4%-12%), and kaolinite (2%-10%) share a similar pattern with higher contents during interglacials than glacials, mirroring to that of smectite. The results indicate that the smectite-dominated clay minerals derive mainly from the river detrital inputs of New Guinea. The glacial-interglacial cycle of clay mineral assemblages well correspond to the fluctuation of sea level. When the sea level was low, the river materials can travel more easily across the narrow shelf off the island of New Guinea, inject directly into the subsurface currents flowing westwards, then merge into the Equatorial Undercurrent (EUC), and eventually deposit on the central part of WPWP. Precessional periods of the smectite content indicate the intensity of mechanical erosion in its provenance of New Guinea, responding to the river runoff and precipitation, and this could also be linked to the meridional migration of the Intertropical Convergence Zone (ITCZ).

Precessional changes in the western equatorial Pacific Hydroclimate: A 240 kyr marine record from the Halmahera Sea, East Indonesia

“…Supporting Information: Readme Supplementary Figures Table S1 Table S2 Table S3 Correspondence to: H. Dang, hwdang@gmail.com have been proposed to be controlled by the AISM [L€ uckge et al, 2009;Tachikawa et al, 2011;Wu et al, 2012Wu et al, , 2013. These findings are supported by the stalagmite d 18 O record from Flores Island [Griffiths et al, 2009] and are consistent with the hemispheric summer insolation forcing hypothesis.…”

“…Previous reports of terrigenous input from the southern hemisphere areas of the IPWP generally show dominant precessional variations in‐phase with austral summer (December to February) insolation change, and have been proposed to be controlled by the AISM [ Lückge et al ., ; Tachikawa et al ., ; Wu et al ., ]. These findings are supported by the stalagmite δ 18 O record from Flores Island [ Griffiths et al ., ] and are consistent with the hemispheric summer insolation forcing hypothesis.…”

Unraveling North-African riverine and eolian contributions to central Mediterranean sediments during Holocene sapropel S1 formation

“…The clay mineral assemblage is known to be related to provenance and hydrological environmental conditions (e.g. Chamley, 1989;Wu et al, 2012;Bout-Roumazeilles et al, 2013). A northesouth contrast in hydroclimate conditions has been proposed for the Holocene central Mediterranean (see review by Magny et al, 2013).…”

Clay mineralogy of Gulf of Papua Shelf and Pandora Trough deposits constrains sediment routing during the last sea‐level cycle

“…Vital et al, 1999) including river switching (Heroy et al, 2003), changes in climatic, precipitation and weathering regimes (e.g. Wan et al, 2007;Montero-Serrano et al, 2010;Wu et al, 2012;Huang et al, 2016), or modern and past sediment transport by oceanographic currents and rivers (e.g. Varela et al, 2013;Andrews & Vogt, 2014).…”