Weathering of pumice in the sediments as a possible source of major ions for the waters of Lake Taupo, New Zealand

Timperley, Michael H.; Vigor-Brown, R. J.

doi:10.1016/0009-2541(85)90146-9

Cited by 13 publications

(9 citation statements)

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“…The higher concentrations of Rb and K in the interstitial waters most likely result from post-depositional decomposition of plant material and dissolution of volcanic rock fragments. This latter process has been suggested as a source of major ions for waters of Lake Taupo (Timperley & Vigor-Brown 1985). Relative to TK, the lake sediments have lower concentrations of both TLi and TRb compared to suspended solids but have higher concentrations compared to volcanic rocks.…”

Section: Discussionmentioning

confidence: 98%

“…These two sources have widely differing ratios among Li, Rb, and K. In particular the rocks have a low average Li: K ratio of about 1.6 X 10~~3, whereas the average ratio in geothermal fluids is 104 X 10~3. In their study of major ion mass budgets for Lake Taupo, Timperley & Vigor-Brown (1985) considered all fLi in the lake water to originate from geothermal fluids. This assumption is supported in our study by the low fLi concentrations found in the Waipa River water, which is not known to be influenced by geothermal fluids (Mongillo & Clelland 1984).…”

Section: Discussionmentioning

confidence: 99%

“…More than 80% of the salts in Lake Taupo water are derived from weathering of surficial volcanic rocks (Timperley & Vigor-Brown 1985), and since this lake supplies most of the water to the Waikato River, the filtrable Li: K and Rb: K ratios in the river water would be expected, and were found, to lie between those for the rocks of the catchment and those for geothermal fluids.…”

Section: River Watermentioning

confidence: 99%

“…The water chemistry of the river is influenced primarily by the waters of Lake Taupo whose composition is determined mostly by weathering of surficial volcanic rocks (Timperley & Vigor-Brown 1985, 1986, but geothermal fluids entering the lake and river have a substantial effect. In their studies of the major ionic composition of Lake Taupo water, Timperley & Vigor-Brown (1985, 1986 concluded that geothermal fluids contributed between 11 and 17% of the dissolved salts in the lake.…”

Section: Introductionmentioning

confidence: 99%

“…In their studies of the major ionic composition of Lake Taupo water, Timperley & Vigor-Brown (1985, 1986 concluded that geothermal fluids contributed between 11 and 17% of the dissolved salts in the lake. In the first 10 km down stream from the lake, the river receives further geothermal fluids from several small streams and from the Wairakei Geothermal Power Station.…”

Section: Introductionmentioning

confidence: 99%

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Lithium and rubidium in the Waikato River, New Zealand

Timperley

1988

New Zealand Journal of Marine and Freshwater Research

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Lithium and rubidium in the Waikato River originate partly from geothermal fluids and partly from weathering of surficial volcanic rocks. This paper reports on the distribution and behaviour of these metals in the river system. Total Li concentrations in the river water increased from 0.079 g/m 3 at the Lake Taupo outlet to 0.435 g/m 3 at Mercer, but the ratios of filtrable to particulate metal decreased from 1.82 to 0.322, respectively. The corresponding concentrations for Rb were 0.038 and 0.626 g/m 3, and the ratios were 0.095 and 0.040. Geothermal fluids are the source of about 80% of filtrable Li but only 50% of filtrable Rb. Weathering of volcanic rocks contributes the remainder of the metals. Approximately 11001 each of total Li and total Rb flow annually past Lake Aratiatia and more than 99% of these totals flow into the Tasman Sea. About 3 t of Li and 6 t of Rb accumulate each year into reservoir sediment; reservoir macrophytes, which probably turn over each year, could contain up to 0.5 t of Li and 8.4 t of Rb. Within the reservoir sediments and macrophytes, Li, Rb, and K each show different distributions.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: River Watermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lithium and rubidium in the Waikato River, New Zealand

Timperley

1988

New Zealand Journal of Marine and Freshwater Research

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Catchment geology preconditions spatio-temporal heterogeneity of ecosystem functioning in forested headwater streams

et al. 2022

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Catchment geology can affect water chemistry and groundwater influence, eventually affecting macroinvertebrate communities, but its effects on stream functions such as leaf decomposition have been scarcely investigated. To understand the effects of geology on leaf decomposition, we conducted leaf litter 2 experiments in streams with volcanic and non-volcanic substrata using fine and coarse mesh bags. Volcanic spring-fed streams showed lower temperature in summer and higher temperature in winter (with temperature difference being more pronounced later in incubation) than non-volcanic streams.Macroinvertebrate communities captured inside coarse litter bags differed in the two stream types in both seasons, mainly because of shredder communities. Shredder abundance and biomass were higher in volcanic streams in both seasons. Geology-dependent temperature influenced microbe-mediated decomposition in both seasons, with total phosphorus as an additional driver in winter. Summer temperature was associated with an overall positive effect on the abundance of shredders, which affected invertebratemediated decomposition, but this was not evident in winter. Shredder activity in volcanic streams compensated for temperature-dependent microbial activity resulting in an overall balance in leaf decomposition. Spring-fed systems are valuable ecosystems, particularly for cold-adapted species. Thus, understanding these understudied ecosystems will significantly aid in their appropriate conservation.

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Sedimentary and geochemical evidence of Eocene climate change in the Xining Basin, northeastern Tibetan Plateau

Sayem

Guo

et al. 2018

Sci. China Earth Sci.

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Weathering of pumice in the sediments as a possible source of major ions for the waters of Lake Taupo, New Zealand

Cited by 13 publications

References 9 publications

Lithium and rubidium in the Waikato River, New Zealand

Lithium and rubidium in the Waikato River, New Zealand

Catchment geology preconditions spatio-temporal heterogeneity of ecosystem functioning in forested headwater streams

Sedimentary and geochemical evidence of Eocene climate change in the Xining Basin, northeastern Tibetan Plateau

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