查看更多>>摘要：Welcome to the third issue of Volume 131 of Applied Earth Science. The main body of this issue consists of abstracts from the early-career focused International Platinum Symposium, held virtually in May 2022 and organised by William Smith, Chris Jenkins, Claudia Augustin, Erin Thompson, Kate Canham, Priyan-jan Datta, Abhishek Pandey, and Ivan Chayka. The quality of the abstracts presented at the conference is a testament to the excellent research being undertaken by student and early career geoscientists in this field, and I'd encourage all of you to have a look at the content and see what the cutting edge of platinum group element research looks like.
查看更多>>摘要：This issue contains abstracts from a variant of the biennial International Platinum Symposium that was held virtually in May 2022. This symposium differed from previous events in that the organising committee, keynote speakers, and symposium presenters were made up entirely of students and early-career researchers. The event was organised to facilitate discussions, networking, and collaboration amongst budding researchers, something that has been hampered throughout the COVID-19 pandemic. The organising committee and reviewers are thanked for their contributions to this abstract volume, and hopefully these studies become full journal articles in the future.
查看更多>>摘要：Layered basaltic intrusions, such as the Rustenburg Layered Suite (RLS), are the fossilised remnants of crustal magma chambers, and host some of Earth's largest known platinum-group element (PGE), chromium, and vanadium ore deposits. Deciphering the origin of these ore deposits depends on an understanding of the magmatic processes that operated to produce the first order macrorhythmic igneous layering. The 'traditional' view is that layered intrusions are formed by the sequential injection of magma, and its solidification as an upwardly (sequential) aggrading crystal pile by either crystal settling or in situ crystallisation. Sequential solidification implies that younger layers are emplaced on top of older layers in a large 'tank' of silicate magma. The mass balance problem of chromitites (and stratiform PGE deposits) offers support to this concept of a large magma tank. [1] This is based on the weak assumption that individual layers of chromitite (in the RLS) are laterally continuous for 10-100 s of kilometres.
查看更多>>摘要：The northern limb of the Bushveld Complex, South Africa, is globally recognised as one of the world's largest resources of platinum-group elements (PGEs). These metals are essential to the growth of sustainable and environmentally friendly technologies, particularly within the electric vehicle industry; a market which is expected to grow exponentially in the coming decades.
Kiara C. BrooksbyHannah S. R. HughesJens C. O. Andersen
2页
查看更多>>摘要：Exploration geoscience practitioners use spatial data to derive insights into the spatial distribution and other characteristics of target geological objects (e.g., an orebody). However, interpretation of large datasets by human interpreters is often highly subjective. This study tests the possibility of using data science techniques on complex and very large databases in order to produce more systematic and robust results.
查看更多>>摘要：The stratigraphy of the Rustenburg Layered Suite in the northern limb is different from that of the eastern and western limbs south of the Thabazimbi-Murchi-son Lineament. In the northern limb, the Lower Zone occurs as chonolith-like bodies that intruded into Archaean granite-gneisses and metasedi-mentary rocks of the Transvaal Supergroup [ 1 ]. These bodies host Cr and Ni-Cu-PGE sulphide deposits, whereas the Lower Zone in the rest of the complex is barren. The Uitloop Lower Zone intrusion is exposed as two separate bodies (Uitloop I and Uitloop II) which lie along the eastern periphery of the northern limb.
查看更多>>摘要：The northern limb of the Bushveld Complex, South Africa, contains various mineralised horizons, one of which is the Flatreef. The Flatreef is the correlative equivalent of the Upper Critical Zone in the eastern and western limbs of the Bushveld Complex. In the northern limb, the Flatreef is emplaced in direct contact with the Transvaal Supergroup sediments and shows significant petrological and geochemical evidence for magma-footwall interaction. Ultramafic rocks in the Lower Flatreef comprise distinctive hybrid lithologies that form the Footwall Assimilation Zone (FAZ) and are associated with fragments of partially melted sedimentary xenoliths. In this study, we investigate the petrography and geochemistry of the various mineral assemblages that are associated with dolomitic xenoliths with the aim of providing further understanding of the processes of carbonate assimilation that occurred.
查看更多>>摘要：The northern limb of the Bushveld Complex is one of the Earth's most important resources of platinum-group elements (PGE), hosting the world-class Platreef deposit within Critical Zone stratigraphy, as well as several other occurrences of PGE-Ni-Cu-Co mineralisation within its Lower and Main Zone stratigraphy. As exploration and research expands, mineralisation and stratigraphy throughout the northern limb are being reassessed.
查看更多>>摘要：The Bushveld Complex is an economically important and scientifically fascinating intrusion due to the thick chromitite layers contained in its Critical Zone (Figure 1). These laterally extensive chromitite layers are mined for chromium and, for some layers, platinum-group elements. They are subdivided into Lower Group, Middle Group and Upper Group chromitites (LG, MG and UG respectively) of which the LG and MG chromitites were analysed in this study. Field observations from open pit and underground exposures in the eastern and western Lobes of the Bushveld Complex were used to describe the chromitite morphology on a regional scale. The studied chromitite layers are traceable over long distances and may occur as one, two or three chromitite layers at distinct locations, with several changes in the number of their layers and their thickness occurring along a distance of a few kilometres. This is best understood as a structure of regionally bifurcating chromitites with small-scale bifurcations being visible even at the scale of individual outcrops.
Charlie Compton-JonesHannah S. R. Hugheslain McDonald
2页
查看更多>>摘要：Recent studies have demonstrated that the platinum-group elements (PGE) may be mobilised in the lithospheric mantle via methods other than traditional partial melting (e.g. mobilisation by supercritical CO_2 fluids, physical entrainment) which could have an important role in the metal budget of exotic, mantle-derived melts (e.g. orangeites). These processes may even play a role in forming parental magmas of deposits associated with large igneous provinces (LIPs).In this study we assess the PGE systematics of a suite of potassic-ultramafic orangeite dykes that formed by very low degree partial melting of a meta-somatically enriched sub-continental lithospheric mantle (SCLM) source, residing towards the base of the Kaapvaal Craton.
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Taylor & Francis