Geochemical mass balance for lithium, boron, and strontium in the Gulf of Papua, Papua New Guinea (project TROPICS)

Sedimentary Diagenesis, Depositional Environments, and Benthic Fluxes

“…(a) Net sediment accumulation (particle advection) varies by $6 orders of magnitude as a function of bathymetric depth in the ocean (square data symbols from synthesis of Soetaert et al (1996a)). Accumulation can be highly variable at any given depth and, in the case of deltaic systems, can range over at least 3 orders of magnitude within a <50 m depth interval (unweighted mid-range and accumulation range data from the Amazon, Gulf of Papua, and Mississippi deltas after Brunskill et al, 2003;Corbett et al, 2006;Dukat and Kuehl, 1995;Kuehl et al, 1986;Walsh et al, 2004). (b) Particle mixing coefficients determined using 234 Th (t ½ ¼ 24 days; open triangles) and 210 Pb (t ½ ¼ 22 years; solid circles) within deposits are a function of bathymetric depth in the ocean (Data summary from Lecroart et al, 2010).…”

“…Significant variations can occur at any given depth due to regional oceanographic conditions, such as increased productivity and delivery of reactive organic matter from overlying water due to seasonal upwelling or overturn, permanent or seasonal low O 2 in overlying water, or turbidity currents and pulse inputs due to particular local combinations of ocean basin physiography, circulation patterns, tectonic activity, storms, and river sources. In major deltaic systems, for example, it is not unusual for sediment accumulation to vary by 3-4 orders of magnitude over a restricted depth range of 5-100 m (Figure 7(a); Brunskill et al, 2003;Corbett et al, 2006;Dukat and Kuehl, 1995;Kuehl et al, 1986;Walsh et al, 2004). 8.11.5.2 Spatial Patterns in Reactive C org Delivery and…”

Geochemistry of a chert breccia

“…The concentration of Li in modern seawater is around 180 g L Ϫ1 (Huh et al, 1998). In freshwater, the concentration of Li greatly varies, from ϳ0.2 g L Ϫ1 in granitic catchments runoff up to some 70 g L Ϫ1 in waters draining calcareous-evaporitic bedrock and soils (Brunskill et al, 2003). It can readily be shown that, using a feasible W/R ϭ 1 value and a (maximum!)…”

Behavior of major and minor elements in a temperate river estuary to the coastal sea

“…Past studies in estuary on Sr behavior revealed two component conservative mixing between sea and river water (Andersson et al 1992;Ingram and Sloan 1992;Brunskill et al 2003;Sharma et al 2007). Recent data on groundwater mixing with seawater in a subterranean estuary indicated that Sr can behave non-conservatively under certain redox conditions (Charette and Sholkovitz 2006).…”