The Broken Hill Block, a new structure and mineral exploration target areas
نویسندگان
چکیده
The Broken Hill Block contains the Paleoproterozoic Willyama Supergroup, host to world-renowned lead–zinc–silver deposits known as Line of Lode. A new large-scale geological structural interpretation has been developed based on construction 11 regional-scale cross-sections and one longitudinal section. Over an extended period major folding during Olarian Orogeny, two distinct sets regional folds were produced. are similar-type mostly trend northeast. cross-folds subtle, at right angles open-style. Longitudinal in or near Lode have reinterpreted. newly interpreted slump fold, central Lode, allows correlation rock units from east west. well-known Western Anticline Eastern Syncline, which main normal drag folds, formed initial with their axes folded by later folding. lead lodes older than zinc lodes. We interpret previously mapped successive pulses within tectonic event. This resulted increased complexity a local scale, but not no substantive impact structure. Pitch plunge data used identify 23 cross-folds, some more 50 km long. Away structure is simpler previous interpretations inversion stratigraphy, other gravity slumping, nappe structures. combination produced domes troughs throughout block. intersection fold cross-fold crests proposed be particularly prospective for metallic sulfides 25 named prioritised mineral exploration target areas identified. cross-folding caused ore bodies steeply great depths north Further northeast, reversed bringing strata, containing potential northern extensions closer surface. retrograde schist zones, faults shears that undergone metamorphism, postdate considered related thrust Displacement strata structures evident across zones generally well understood. KEY POINTSA set termed identified.In large-sale include fold.The stratigraphic sequence inverted; nappes most part present.Broken Hill-type preferentially found close axes.
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ژورنال
عنوان ژورنال: Australian Journal of Earth Sciences
سال: 2022
ISSN: ['1440-0952', '0812-0099']
DOI: https://doi.org/10.1080/08120099.2022.2058609