Abstract
The Palaeoproterozoic Huckleberry Cu-Ni-(PGE) prospect in the Labrador Trough, northern Québec, represents a ~ 400-m-thick, out-of-sequence sill complex that comprises a ~200-m-thick glomeroporphyritic gabbro, intruded in its centre by a ~200-m-thick differentiated gabbro-peridotite sill and in its gabbroic footwall, several thinner (<30 m) ultramafic sills. Globular sulphides are present at the base of the sill complex, whereas disseminated to net-textured sulphides occur in the ultramafic units (Cu/Ni = 0.1–0.8) as well as their gabbroic footwall (Cu/Ni = 1–3). The glomeroporphyritic gabbro sill stack (MgO ~4 wt%, TiO2 ~0.6 wt%, Na2O + K2O ~2–3%, Eu/Eu* ~ 1.2, Anplg ~70–60) comprises several sills characterised by sharp changes in size and abundance of plagioclase glomerocrysts. We hypothesise that the glomerocrysts represent remobilised crystal mushes that were dislodged from a floatation cumulate in a staging chamber during episodic expulsion of magma. In the central gabbro-peridotite sill, mineral compositions (Foolv ~75–75, Mg#opx ≈ 78–68, Anplg ≈ 78–70) and whole-rock data (MgO ≈ 22 – 27%, TiO2 ≈ 0.4%) suggest that the parent magma was an olivine-saturated basalt containing 8–9 wt% MgO. Whole-rock geochemical data further suggests that the parent magmas did not undergo any significant contamination (La/SmN < 2, S/Se < 4000). The Cu/Pd values of ultramafic units (>10,000) suggest sulphide melt saturation was attained before their final emplacement in magma feeder conduits or staging chambers at relatively low R factors (1000–5000). Downward decreasing concentrations of chalcophile elements in the drill cores suggests that sulphide melt percolated downward from the ultramafic cumulate units into the glomeroporphyritic gabbro footwall. We propose that the footwall ultramafic sills represent downward injections of olivine and sulphide melt from the overlying gabbro-peridotite sill, which mechanically concentrated high volumes of sulphide in narrow sills.
Highlights
What is a “sustainable building?” Written works define it as being designed to adhere to several objectives: (1) to preserve energy and materials and ensure that resources are recycled and that the release of toxic substances is limited throughout the building’s process, encompassing the design, building, functioning, preservation, and destruction; (2) to suitably comply with the local environment, values, and societal structure; and (3) to maintain and enhance the standard of people’s living whilst preserving the ecosystem’s aptitude domestically and globally [1]. is definition brought together what is known as the three pillars of sustainability [2,3,4]: environmental, economical, and social well-being
Ere are many standards, databases, and tools dedicated to sustainable design in the building sector. e standards including International Organisation for Standardisation (ISO)/TC 59/SC 17, ISO/Technical Committee 207 (TC 207)/Subcommittee 5 (SC 5), and Committee for Standardisation (CEN)/Technical Committee 350 (TC 350) lay the foundations for assessing the sustainability of a building during the life cycle. ese standards measure the influence and elements of buildings in terms of their environmental, social, and financial impact via quantitative and qualitative signs [5,6,7]
Danatzko and Sezen [26] discussed five positive and negative sustainable attributes of sustainable structural design methodologies. ey suggested that no single methodology can address the complex issues of sustainable structural design, and a combination of the methodology is recommended
Summary
What is a “sustainable building?” Written works define it as being designed to adhere to several objectives: (1) to preserve energy and materials and ensure that resources are recycled and that the release of toxic substances is limited throughout the building’s process, encompassing the design, building, functioning, preservation, and destruction; (2) to suitably comply with the local environment, values, and societal structure; and (3) to maintain and enhance the standard of people’s living whilst preserving the ecosystem’s aptitude domestically and globally [1]. is definition brought together what is known as the three pillars of sustainability [2,3,4]: environmental, economical, and social well-being. Ese standards measure the influence and elements of buildings in terms of their environmental, social, and financial impact via quantitative and qualitative signs [5,6,7] In most cases, these series of standards are merely served as guidelines and need to be used in conjunction with a specific database or rating score system since they provide little information on benchmarks, levels of performance, and detailed information [8]. E rating systems such as BREEAM and LEED group the environmental impacts into several sections, produce an overall score for the building depending on points gained in each section, and deliver a certificated assessment [11,12,13] These assessments are normally conducted after the design phase and serve primarily as a verification document rather than a decision-aid tool, providing little guidance for the designer during the design process [14, 15].
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