Nickel in olivine as an exploration indicator for magmatic Ni-Cu sulfide deposits: A data review and re-evaluation
-
Stephen J. Barnes
, Zhuo-Sen Yao
, Ya-Jing Mao
, Ana P. Jesus , Shenghong Yang , Valentina Taranovic and Wolfgang D. Maier
Abstract
Nickel contents of olivine have been widely used as petrogenetic indicators and as fertility indicators for magmatic sulfide potential of mafic-ultramafic intrusions, on the assumption that olivines crystallized from magmas that had equilibrated with sulfide liquid should be relatively depleted in Ni compared with a sulfide-free baseline. This has given rise to a large accumulation of data that is brought together here, along with data on volcanic olivines, to critically evaluate the effectiveness of the approach. We identify multiple sources of variance in Ni content of olivine at a given Fo content, including variability in mantle melt composition due to depth, water content (and possibly source), subsequent fractional crystallization with and without sulfide, recharge and magma mixing, batch equilibration between olivine and sulfide at variable silicate-sulfide ratio (R), and olivine/liquid ratio; and subsequent equilibration during trapped liquid crystallization in orthocumulates. Baselines for Ni in olivine in relation to Fo content are somewhat lower in orogenic belt settings relative to intrusions in continental large igneous provinces (LIPs). This is probably related to differences in initial parent magma compositions, with plume magmas generally forming deeper and at higher temperatures. No clear, universal discrimination is evident in Ni in olivine between ore-bearing, weakly mineralized, and barren intrusions, even when tectonic setting is taken into account. However, sulfide-related signals can be identified at the intrusion scale in many cases. Low-R factor and low-tenor sulfides are associated with low-Ni olivines in several examples, and these cases stand out clearly. Anomalously high-Ni olivines are a feature of some mineralized intrusions, in part due to trapped liquid reaction effects. However, in some cases, this mechanism cannot account for the magnitude of enrichment. In these cases, enrichment may be due to re-entrainment of “primitive” Ni-rich sulfide by a more evolved Fe-rich magma, driving the olivine to become Ni-enriched due to Fe-Ni exchange reaction between sulfide and olivine during transport. An extreme case of this process may account for ultra-Ni enriched olivine at Kevitsa (Finland), but more subtle signals elsewhere could be positive indicators. A lack of clear mineralized/barren distinction in specific groups of related intrusions, e.g., the deposits of NW China or the Kotalahti Belt in Finland, may well be due to “false negatives” where undiscovered mineralization exists in specific intrusions or in their feeder systems, or may also be due to a multiplicity of confounding factors. Wide variability of both Fo and Ni between related intrusions at regional scale may be a useful regional prospectivity indicator, more than an intrusion-scale discriminant, and is certainly informative as a petrogenetic indicator. In general, the use of Ni-olivine as a fertility tool is more likely to generate false negatives than false positives, but both are possible, and the technique should be used as part of a broader weight-of-evidence approach.
Acknowledgments and Funding
We thank Yiguan Liu for assistance with data compilation. Louise Schoneveld provided a helpful review of a preliminary draft, and we are grateful to American Mineralogist reviewers James Brenan, Chusi Li, and Huan Chen for constructive suggestions. Data for the Halls Creek Orogen and for the Nova-Bollinger system were collected within industry-funded projects supported by Panoramic Resources and IGO Ltd., respectively.
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Articles in the same Issue
- MSA Review
- Nickel in olivine as an exploration indicator for magmatic Ni-Cu sulfide deposits: A data review and re-evaluation
- Repeat, fast, and high-resolution mapping of fine-scale trace element distribution in pyrite and marcasite by LA-Q-ICP-MS with the Aerosol Rapid Introduction System (ARIS)
- Continuous Be mineralization from two-mica granite to pegmatite: Critical element enrichment processes in a Himalayan leucogranite pluton
- An evolutionary system of mineralogy, Part VI: Earth’s earliest Hadean crust (>4370 Ma)
- Oxidation or cation re-arrangement? Distinct behavior of riebeckite at high temperature
- Fe3+/FeT ratios of amphiboles determined by high spatial resolution single-crystal synchrotron Mössbauer spectroscopy
- How clay delamination supports aseismic slip
- The influence of Al2O3 on the structural properties of MgSiO3 akimotoite
- Atomistic insight into the ferroelastic post-stishovite transition by high-pressure single-crystal X-ray diffraction
- Epidote as a conveyor of water into the Earth’s deep mantle in subduction zones: Insights from coupled high-pressure and high-temperature experiments
- Potential link between antigorite dehydration and shallow intermediate-depth earthquakes in hot subduction zones
- Stability of Fe5O6 and its relation to other Fe-Mg-oxides at high pressures and temperatures
- From schwertmannite to natrojarosite: Long-term stability and kinetic approach
- Trace element and isotopic (S, Pb) constraints on the formation of the giant Chalukou porphyry Mo deposit, NE China
- Textural and chemical evolution of magnetite from the Paleozoic Shuanglong Fe-Cu deposit: Implications for tracing ore-forming fluids
- Jingwenite-(Y) from the Yushui Cu deposit, South China: The first occurrence of a V-HREE-bearing silicate mineral
- Wenjiite, Ti10(Si,P,◻)7, and kangjinlaite, Ti11(Si,P)10, new minerals in the ternary Ti-P-Si system from the Luobusa ophiolite, Tibet, China
- Evaluating the physicochemical conditions for gold occurrences in pyrite
- Letter
- Synthesis and structural analysis of CaFe2O4-type single crystals in the NaAlSiO4-MgAl2O4-Fe3O4 system
Articles in the same Issue
- MSA Review
- Nickel in olivine as an exploration indicator for magmatic Ni-Cu sulfide deposits: A data review and re-evaluation
- Repeat, fast, and high-resolution mapping of fine-scale trace element distribution in pyrite and marcasite by LA-Q-ICP-MS with the Aerosol Rapid Introduction System (ARIS)
- Continuous Be mineralization from two-mica granite to pegmatite: Critical element enrichment processes in a Himalayan leucogranite pluton
- An evolutionary system of mineralogy, Part VI: Earth’s earliest Hadean crust (>4370 Ma)
- Oxidation or cation re-arrangement? Distinct behavior of riebeckite at high temperature
- Fe3+/FeT ratios of amphiboles determined by high spatial resolution single-crystal synchrotron Mössbauer spectroscopy
- How clay delamination supports aseismic slip
- The influence of Al2O3 on the structural properties of MgSiO3 akimotoite
- Atomistic insight into the ferroelastic post-stishovite transition by high-pressure single-crystal X-ray diffraction
- Epidote as a conveyor of water into the Earth’s deep mantle in subduction zones: Insights from coupled high-pressure and high-temperature experiments
- Potential link between antigorite dehydration and shallow intermediate-depth earthquakes in hot subduction zones
- Stability of Fe5O6 and its relation to other Fe-Mg-oxides at high pressures and temperatures
- From schwertmannite to natrojarosite: Long-term stability and kinetic approach
- Trace element and isotopic (S, Pb) constraints on the formation of the giant Chalukou porphyry Mo deposit, NE China
- Textural and chemical evolution of magnetite from the Paleozoic Shuanglong Fe-Cu deposit: Implications for tracing ore-forming fluids
- Jingwenite-(Y) from the Yushui Cu deposit, South China: The first occurrence of a V-HREE-bearing silicate mineral
- Wenjiite, Ti10(Si,P,◻)7, and kangjinlaite, Ti11(Si,P)10, new minerals in the ternary Ti-P-Si system from the Luobusa ophiolite, Tibet, China
- Evaluating the physicochemical conditions for gold occurrences in pyrite
- Letter
- Synthesis and structural analysis of CaFe2O4-type single crystals in the NaAlSiO4-MgAl2O4-Fe3O4 system