The effect of magma differentiation and degassing on ore metal enrichment during the formation of the world-class Zhuxi W-Cu skarn deposit: Evidence from U-Pb ages, Hf isotopes and trace elements of zircon, and whole-rock geochemistry

Whole-rock and apatite geochemical analyses and zircon U–Pb dating were carried out on the lamprophyres in the world-class Zhuxi W–Cu skarn deposit in northern Jiangxi, South China, in order to understand their origin of mantle sources and their relationship with the deposit, as well as metallogenic setting. The results show the lamprophyres were formed at ca. 157 Ma, just before the granite magmatism and mineralization of the Zhuxi deposit. These lamprophyres have from 58.98–60.76 wt% SiO2, 2.52–4.96 wt% K2O, 5.92–6.41 wt% Fe2O3t, 3.75–4.19 wt% MgO, and 3.61–5.06 wt% CaO, and enrichment of light rare earth elements (LREE) and large-ion lithophile elements (LILE), and depletion of high-field-strength elements (HFSE). Apatites in the lamprophyres are enriched in LREE and LILE, Sr, S, and Cl, and have 87Sr/86Sr ratios ranging from 0.7076 to 0.7078. The conclusions demonstrate that the lithospheric mantle under the Zhuxi deposit was metasomatized during Neoproterozoic subduction. Late Jurassic crustal extension caused upwelling of the asthenospheric mantle and consecutively melted the enriched lithospheric mantle and then crustal basement, corresponding to the formation of lamprophyres and mineralization-related granites in the Zhuxi deposit, respectively.

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ROLE OF SEDIMENT RECYCLING AT THE EARLY–MIDDLE PALEOZOIC SUBDUCTION ZONE IN THE CHINESE ALTAY INFERRED FROM SR–ND–HF ISOTOPES AND TRACE ELEMENTS OF THE SUBDUCTION-RELATED GRANITOIDS

10.1130/abs/2017am-301137 ◽

2017 ◽

Author(s):

Chen Zhang ◽

◽

Dongdong Liu

Keyword(s):

Trace Elements ◽

Subduction Zone ◽

Hf Isotopes ◽

Middle Paleozoic

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Natural Resources and their Units

Anthropological Journal of European Cultures ◽

10.3167/ajec.2020.290105 ◽

2020 ◽

Vol 29 (1) ◽

pp. 63-79

Author(s):

Frida Hastrup

Keyword(s):

Natural Resources ◽

Complex Terrain ◽

Western Norway ◽

Fruit Cultivation ◽

The World ◽

World Class ◽

A Site

Dating back to medieval times, fruit cultivation in Hardanger in western Norway is rooted in what is portrayed as a perfect microclimate naturally yielding the best apples in the world. However, the viability of the comparatively minute Norwegian fruit trade is continuously threatened by competition from outside, spurring all kinds of initiatives and policies to make it sustainable. The Norwegian fruit landscape, in other words, is both the natural and perfect home of world-class fruit and a site for continuous, often state-driven interventions to make it so; indeed, the perfection of the place accentuates the need to do what it takes to make it thrive. The necessary means to accomplish such viability, however, make up a complex terrain, as the resourcefulness of the Norwegian fruit landscape is ‘measured’ according to very different units.

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