scholarly journals Post-supereruption Magmatic Reconstruction of Taupo Volcano (New Zealand), as Reflected in Zircon Ages and Trace Elements

2014 ◽  
Vol 55 (8) ◽  
pp. 1511-1533 ◽  
Author(s):  
S. J. Barker ◽  
C. J. N. Wilson ◽  
E. G. C. Smith ◽  
B. L. A. Charlier ◽  
J. L. Wooden ◽  
...  
Keyword(s):  
Trace Elements ◽  
New Zealand ◽  
Taupo Volcano

scholarly journals Crustal deformation using GPS and InSAR analysis at Taupo volcano, New Zealand

2021 ◽  
Author(s):  
Cyril Journeau ◽  
Sigrun Hreinsdottir ◽  
Ian Hamling
Keyword(s):  
New Zealand ◽  
Crustal Deformation ◽  
Taupo Volcano

Current issues in trace element nutrition of grazing livestock in Australia and New Zealand

1999 ◽  
Vol 50 (8) ◽  
pp. 1341 ◽  
Author(s):  
D. G. Masters ◽  
G. J. Judson ◽  
C. L. White ◽  
J. Lee ◽  
N. D. Grace
Keyword(s):  
Trace Elements ◽  
New Zealand ◽  
Trace Element ◽  
Recent Work ◽  
Cost Effective ◽  
Trace Element Composition ◽  
Scientific Data ◽  
Pastoral System ◽  
Trace Element Nutrition ◽  
Grazing Livestock

Improving trace element nutrition of grazing animals, in a way that is cost effective and that meets consumer perceptions and preferences, is a continuing challenge. This review focuses on research over the past 10 years, addressing issues and perspectives on the roles, risks of inadequacy, and supplementary remedies of key trace elements, both essential and deleterious, which have an impact on the productivity and product quality of grazing livestock throughout Australia and New Zealand. The emphasis is on copper (Cu), cobalt (Co), iodine (I), selenium (Se), and, to a lesser extent, zinc (Zn) — the trace elements most frequently found to be deficient in parts of Australia and New Zealand. Research continues to elucidate new roles for trace elements in the animal, and as this leads to a better understanding of requirements, diagnostic criteria and supplementation strategies need re-evaluation. Newer perspectives on marginal deficiency for Cu, I, Se, and Zn are given and issues for risk management discussed. Advances in sustained delivery of trace elements such as Co (as vitamin B12), I, and Se are reported. The diagnosis and management of marginal Cu deficiency continue to be difficult, especially in New Zealand where recent work has shown that dietary antagonists [iron (Fe), molybdenum (Mo), and sulfur (S)] may impair Cu absorption at lower intakes than previously thought. There is still a dearth of scientific data on the advantages of using so-called organic trace element supplements (metals complexed or chelated with amino acids or peptides). Nevertheless their usage continues to increase. There is increasing evidence that trace elements influence the pathophysiology arising from the ingestion of toxins. This review summarises recent work on the role of Co in annual ryegrass toxicity; Cu, Se, and Zn in lupinosis; Cu and alkaloid toxicity; Zn and facial eczema; and Co and white liver disease. Trace elements are required to support immune function (e.g. as imposed parasite infection) and marginal deficiencies may be exacerbated by an immunological challenge. The roles of Cu, Co, Mo, Se, and, to a lesser extent, chromium and Zn have attracted attention and under conditions of stress there may be an additional need for these elements. Diversification in farming has led to the introduction of species such as deer (Cervus), alpacas (Camilids), emus, and ostriches (Ratites) and the paucity of information on trace element requirements for these species, and also for horses, indicates the need for further work. The effect of supplementation on trace element composition of meat, milk, and wool is also reviewed, both in terms of product characteristics and human health. Of the deleterious elements, cadmium has attracted the most interest and concern because of its introduction into the pastoral system from phosphate-based fertilisers.

Petrology and dynamics of the Waimihia mixed magma eruption, Taupo Volcano, New Zealand

1992 ◽  
Vol 149 (2) ◽  
pp. 193-207 ◽  
Author(s):  
S. BLAKE ◽  
C. J. N. WILSON ◽  
I. E. M. SMITH ◽  
G. P. L. WALKER
Keyword(s):  
New Zealand ◽  
Taupo Volcano

Large-scale mass-wasting processes following the 232 CE Hatepe Eruption of Taupo Volcano, New Zealand - Sedimentary features and dispersal of reworked Taupo Ignimbrite in the Ongarue River valley

2020 ◽  
Author(s):  
Anke Verena Zernack ◽  
Jonathan Noel Procter
Keyword(s):  
New Zealand ◽  
Large Scale ◽  
Basal Layer ◽  
Source Area ◽  
Field Studies ◽  
Mass Wasting ◽  
Sedimentary Characteristics ◽  
Sediment Yields ◽  
Fluvial Sedimentation ◽  
Taupo Volcano

<p>The 232 CE Hatepe Eruption of Taupo Volcano, New Zealand (also referred to as Taupo Eruption), was one of the most violent and complex silicic eruptions worldwide in the last 5,000 years. The pyroclastic sequence was subdivided into 7 distinct stratigraphic units that reflect diverse eruption mechanisms with pumice fallout unit 5 (Taupo Plinian) and unit 6 (Taupo Ignimbrite) contributing the largest volumes, an estimated 5.8 km<sup>3</sup> and 12.1 km<sup>3 </sup>DRE respectively. The non-welded Taupo Ignimbrite was emplaced by a highly energetic flow over a near-circular area of 20,000 km<sup>2</sup> around the vent, reaching distances of 80±10 km. It consists of an irregular basal layer and a thicker pumice-dominated main unit containing varying proportions of pumice clasts, vitric ash and dense components, overlain by a thin co-ignimbrite ash bed. The main ignimbrite unit shows two distinct facies, a landscape-mantling veneer deposit that gradually decreases from 10 m proximal thickness to 15-30 cm distally and a more voluminous, up to 70-m thick valley-ponded ignimbrite that filled depressions and smoothed out the landscape.</p><p>The sudden influx of vast volumes of loose pyroclastic material choked the drainage systems around the volcano, resulting in a large-scale geomorphic and sedimentary response. While previous work focused on major river catchments north to southeast of the volcano, we aim at characterising and quantifying landscape adjustment and remobilisation processes to the west, using stratigraphic, sedimentologic and geomorphic field studies of the volcaniclastic sequences along the Ongarue and Whanganui River valleys. Our working hypothesis involves a four-stage landscape response model based on previously described mass-wasting processes in the aftermath of large explosive eruptions: 1) large-scale remobilisation of ignimbrite veneer material from sloping surfaces by series of debris and hyperconcentrated flows, emplacing lahar deposits across the ignimbrite dispersal area and beyond, 2) cutting of steep channels into valley-ponded ignimbrite and resedimentation as lahar deposits downstream, 3) gradual widening of channels leading to establishment of an active channel with adjacent floodplains as sediment yields decrease and the landscape restabilises, represented by normal stream flow and flood deposits in the ignimbrite dispersal area and a shift from lahar to fluvial- dominated sequences downstream, and 4) return to pre-eruption sediment yields resulting in further downward incision to the original bedrock channel bed and prevailing fluvial sedimentation processes with remnants of primary and reworked deposits preserved as terraces along the valley walls.</p><p>Here we present initial results on the stratigraphy of the volcaniclastic sequence and the sedimentary characteristics and dispersal of the identified lithofacies associations, which range from debris-flow and hyperconcentrated-flow to pumiceous fluvial deposits. Tempo-spatial variations in deposit characteristics are due to differences in source material, flow type, and nature of the source area and depositional environment.</p>

Evidence from zircon U-Pb age spectra for crustal structure and felsic magma genesis at Taupo volcano, New Zealand

Geology ◽  
2010 ◽  
Vol 38 (10) ◽  
pp. 915-918 ◽  
Author(s):  
B.L.A. Charlier ◽  
C.J.N. Wilson ◽  
N. Mortimer
Keyword(s):  
New Zealand ◽  
Crustal Structure ◽  
Felsic Magma ◽  
Magma Genesis ◽  
Taupo Volcano
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