Constraints on Magmatic Evolution of the Dun Mountain Ophiolite Belt, New Zealand: New Evidence of Subduction Initiation and Embryonic Arc Development

2021 ◽  
Author(s):  
Daniel Patias ◽  
Renjie Zhou ◽  
Jonathan Aitchison
Keyword(s):  
New Zealand ◽  
Magmatic Evolution ◽  
Subduction Initiation ◽  
Ophiolite Belt ◽  
New Evidence

MANTLE DEFORMATION RECORDING SUBDUCTION INITIATION, RED HILLS, NEW ZEALAND

2017 ◽  
Author(s):  
Julie Newman ◽  
◽  
Eric D. Stewart ◽  
Basil Tikoff ◽  
Brent Miller ◽  
...  
Keyword(s):  
New Zealand ◽  
Subduction Initiation ◽  
Red Hills

scholarly journals A conceptual model of flow to the Waikoropupu Springs, NW Nelson, New Zealand, based on hydrometric and tracer (<sup>18</sup>O, Cl,<sup>3</sup>H and CFC) evidence

2008 ◽  
Vol 12 (1) ◽  
pp. 1-19 ◽  
Author(s):  
M. K. Stewart ◽  
J. T. Thomas
Keyword(s):  
New Zealand ◽  
Flow Model ◽  
Sea Water ◽  
Quantitative Description ◽  
Water Volume ◽  
Deep Aquifer ◽  
Submarine Springs ◽  
Recharge Sources ◽  
Flow Systems ◽  
New Evidence

Abstract. The Waikoropupu Springs, a large karst resurgence 4 km from the coast, are supplied by the Arthur Marble Aquifer (AMA) underlying the Takaka Valley, South Island, New Zealand. New evidence on the recharge sources in the catchment, combined with previous results, is used to establish a new recharge model for the AMA. Combined with the oxygen-18 mass balance, this yields a quantitative description of the inputs and outputs to the aquifer. It shows that the Main Spring is sourced mainly from the karst uplands (74%), with smaller contributions from the Upper Takaka River (18%) and valley rainfall (8%), while Fish Creek Spring contains mostly Upper Takaka River water (50%). In addition, much of the Upper Takaka River contribution to the aquifer (58%) bypasses the springs and is discharged offshore via submarine springs. The chemical concentrations of the Main Spring show input of 0.5% of sea water on average, which varies with flow and derives from the deep aquifer. Tritium measurements spanning 40 yr, and CFC-11 measurements, give a mean residence time of 8 yr for the Main Spring water using the preferred two-component model. Our conceptual flow model, based on the flow, chloride, oxygen-18 and age measurements, invokes two different flow systems with different recharge sources to explain the flow within the AMA. One system contains deeply penetrating old water with mean age 10.2 yr and water volume 3 km3, recharged from the karst uplands. The other, at shallow levels below the valley floor, has much younger water with mean age 1.2 yr and water volume 0.4 km3, recharged by Upper Takaka River and valley rainfall. The flow systems contribute in different proportions to the Main Spring, Fish Creek Springs and offshore springs. Their very different behaviours, despite being in the same aquifer, are attributed to the presence of a diorite intrusion below the surface of the lower valley, which diverts the deep flow towards the Waikoropupu Springs and allows much of the shallow flow to pass over the intrusive and escape via submarine springs.

scholarly journals Supplemental Material: Forearc magmatic evolution during subduction initiation: Insights from an Early Cretaceous Tibetan ophiolite and comparison with the Izu-Bonin-Mariana forearc

2020 ◽  
Author(s):  
Jin-Gen Dai ◽  
et al.
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Early Cretaceous ◽  
Analytical Methods ◽  
Major And Trace Elements ◽  
Magmatic Evolution ◽  
Isotopic Data ◽  
Subduction Initiation ◽  
Mariana Forearc

Detailed analytical methods in Text S1, major- and trace-element compositions of clinopyroxene, orthopyroxene, and amphibole, whole-rock major and trace elements, Sr-Nd isotopic data, and zircon U-Pb and Lu-Hf data in Tables S1–S7; Figures S1–S5.

scholarly journals Strike-slip Enables Subduction Initiation beneath a Failed Rift: New Seismic Constraints from Puysegur Margin, New Zealand

2020 ◽  
Author(s):  
Brandon Shuck ◽  
Harm J.A. Van Avendonk ◽  
Sean P. S. Gulick ◽  
Michael Gurnis ◽  
Rupert Sutherland ◽  
...  
Keyword(s):  
New Zealand ◽  
Strike Slip ◽  
Subduction Initiation

Eocene to Miocene Subduction Initiation Recorded in Stratigraphy of Reinga Basin, Northwest New Zealand

Tectonics ◽  
2020 ◽  
Vol 39 (2) ◽  
Author(s):  
D. Orr ◽  
R. Sutherland ◽  
W.R. Stratford
Keyword(s):  
New Zealand ◽  
Subduction Initiation

Immigration and Unemployment: New evidence from Australia and New Zealand

1999 ◽  
Vol 13 (2) ◽  
pp. 253-260 ◽  
Author(s):  
Jordan Shan
Keyword(s):  
New Zealand ◽  
New Evidence

Uranium-lead ages from the Dun Mountain ophiolite belt and Brook Street terrane, South Island, New Zealand

1992 ◽  
Vol 104 (4) ◽  
pp. 429-443 ◽  
Author(s):  
DAVID L. KIMBROUGH ◽  
JAMES M. MATTINSON ◽  
DOUGLAS S. COOMBS ◽  
CHARLES A. LANDIS ◽  
MIKE R. JOHNSTON
Keyword(s):  
New Zealand ◽  
Ophiolite Belt
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