Os isotopic constraints on crustal contamination in Auckland Volcanic Field basalts, New Zealand

Hopkins, Jenni L.; Timm, Christian; Millet, Marc-Alban; Poirier, André; Wilson, C. J. N.; Leonard, Graham S.

doi:10.1016/j.chemgeo.2016.06.019

Cited by 13 publications

(3 citation statements)

References 129 publications

(225 reference statements)

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“…Alternatively, some workers have proposed that accumulation of lithospheric and/or xenocrystic olivine can also produce magmas with high Os concentrations (Hopkins et al, 2016; Reisberg et al, 1993). Partition coefficients estimated for Os in olivine/melt range from 1 to 20, with one value from a disequilibrium case as high as 200 (Hart & Ravizza, 1996; Luguet et al, 2007; Martin et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Changing Mantle Sources and the Effects of Crustal Passage on the Steens Basalt, SE Oregon: Chemical and Isotopic Constraints

Moore

Grunder

Bohrson

et al. 2020

Geochem Geophys Geosyst

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Continental flood basalts are more prone to compositional modification from passage through thicker and (or) more felsic crust in comparison to their oceanic counterparts. The Steens Basalt in southeast Oregon (~17 Ma) is among the oldest and most mafic members of the Columbia River Basalt Group and provides a record of the early stages of flood basalt volcanism. We evaluate the balance of mantle sources in time during the onset of Columbia River Basalt Group magmatism and assess the effect of crustal passage using stratigraphically controlled Sr, Nd, Pb, Hf, Os, and O isotopic compositions, as well as whole rock major and trace element data. Mixing models indicate that depleted and enriched mantle sources identified by previous workers contribute in varying proportions during the life of the magmatic system, with the greatest contribution by depleted mantle when eruption rate and presumed intrusion rate increase. During waxing, enrichment of δ18O in some flows signals cryptic deep fractionation of abundant clinopyroxene followed by shallow fractionation of olivine ± clinopyroxene ± plagioclase. Os concentrations are among the highest worldwide at a given MgO (0.29–0.86 ppb at 6.0 to 10.9 wt.%). We argue that high Os results from scavenging of sulfides by recharging magmas passing through earlier crystallized magmas. Elevated 87Sr/86Sr in the latest stage supports modest assimilation of partial melts from mafic accreted terranes, facilitated by thermal priming of crust by persistent magmatism. This work provides a more detailed schematic view of the Steens Basalt magmatic system, from mantle origin through crustal staging.

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Section: Discussionmentioning

confidence: 99%

Changing Mantle Sources and the Effects of Crustal Passage on the Steens Basalt, SE Oregon: Chemical and Isotopic Constraints

Moore

Grunder

Bohrson

et al. 2020

Geochem Geophys Geosyst

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“…AVF is situated on the North Island of New Zealand on a continental crust about 400 km to the west of the Hikurangi Margin subduction zone [122,123]. There are two more intra-plate volcanic fields south of AVF called South Auckland volcanic field (active 1.6-0.5 Ma) [124] and toward the south some slightly older ones such as the Ngatutura and Alexandra Volcanic Fields (active 2.7-1.5 Ma) [125].…”

Section: The Study Areamentioning

confidence: 99%

“…The Auckland volcanic field has been researched from multiple geoscientific angles [87,91,122,123,[132][133][134]138,139] and its geoeducation potential highlighted in several case studies [95,128,[140][141][142][143][144][145]. The concern over disappearing research and education materials for culturally worshipped geological sites has caused unrest in local communities.…”

Section: The Study Areamentioning

confidence: 99%

Visitation Rate Analysis of Geoheritage Features from Earth Science Education Perspective Using Automated Landform Classification and Crowdsourcing: A Geoeducation Capacity Map of the Auckland Volcanic Field, New Zealand

Németh

Procter

2021

Geosciences

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The increase in geoheritage studies has secured recognition globally regarding the importance of abiotic natural features. Prominent in geoheritage screening practices follows a multicriteria assessment framework; however, the complexity of interest in values often causes decision making to overlook geoeducation, one of the primary facets of geosystem services. Auckland volcanic field in New Zealand stretches through the whole area of metropolitan Auckland, which helps preserve volcanic cones and their cultural heritage around its central business district (CBD). They are important sites for developing tourist activities. Geoeducation is becoming a significant factor for tourists and others visiting geomorphological features, but it cannot be achieved without sound planning. This paper investigates the use of big data (FlickR), Geopreservation Inventory, and Geographic Information System for identifying geoeducation capacity of tourist attractions. Through landform classification using the Topographic Position Index and integrated with geological and the inventory data, the underpromoted important geoeducation sites can be mapped and added to the spatial database Auckland Council uses for urban planning. The use of the Geoeducation Capacity Map can help resolve conflicts between the multiple objectives that a bicultural, metropolitan city council need to tackle in the planning of upgrading open spaces while battling of growing demand for land.

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The role of mantle-hybridization and crustal contamination in the petrogenesis of lithospheric mantle-derived alkaline rocks: constraints from Os and Hf isotopes

Mayer

Jung

Brauns

et al. 2018

Contrib Mineral Petrol

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Os isotopic constraints on crustal contamination in Auckland Volcanic Field basalts, New Zealand

Cited by 13 publications

References 129 publications

Changing Mantle Sources and the Effects of Crustal Passage on the Steens Basalt, SE Oregon: Chemical and Isotopic Constraints

Changing Mantle Sources and the Effects of Crustal Passage on the Steens Basalt, SE Oregon: Chemical and Isotopic Constraints

Visitation Rate Analysis of Geoheritage Features from Earth Science Education Perspective Using Automated Landform Classification and Crowdsourcing: A Geoeducation Capacity Map of the Auckland Volcanic Field, New Zealand

The role of mantle-hybridization and crustal contamination in the petrogenesis of lithospheric mantle-derived alkaline rocks: constraints from Os and Hf isotopes

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