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- Ahmadi, OmidUppsala universitet,Geofysik (author)
Seismic signatures of complex geological structures in the Cue-Weld range area, Murchison domain, Yilgarn Craton, Western Australia
- Article/chapterEnglish2016
Publisher, publication year, extent ...
- Elsevier BV,2016
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:uu-259139
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-259139URI
- https://doi.org/10.1016/j.tecto.2016.02.020DOI
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- Language:English
- Summary in:English
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- The Murchison domain forms the northwest part of the Youanmi Terrane, a tectonic unit within the Neoarchean Yilgarn Craton in Western Australia. In the Cue-Weld Range area the Murchison domain has experienced a complex magmatic and deformation history that resulted in a transposed array of greenstone belts that host significant iron, gold, and base metal deposits. In this study, we interpret the upper 2 s (about 6 km) of a deep crustal seismic profile TOGA-YU1, near the town of Cue, and correlate rock units and structures in outcrop with corresponding reflections. We performed 3D constant velocity ray-tracing and calculate the corresponding travel times for the reflectionsfor time domain pre-stack and post-stack seismic data. This allows us to link shallow reflections with mafic volcanic rocks of the Glen Group and basaltic rocks of the Polelle Group in outcrop. Based on our interpretation and published geological maps and data, we propose a model in which the local stratigraphy represents a refolded thrust system. To test our hypothesis, we applied 2D acoustic finite difference forward modeling. The corresponding synthetic data were processed in the same way as the acquired data. Comparisons between the acquired and the synthetic data show that the model is consistent with observations. We propose a new model for the subsurface of the Cue-Weld Range area and argue that some of the lithologies in the area are repeated structurally at different levels. Our approach highlights the benefit of imaging and modeling of deep seismic transects to resolve local structural complexity in Archean granite-greenstone terrains.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Geofysik hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geophysics hsv//eng
- NATURVETENSKAP Geovetenskap och miljövetenskap Geologi hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geology hsv//eng
- Seismic interpretation; 3D structural model; Ray-tracing; Finite difference modeling; Weld range; Murchison domain
- Geofysik med inriktning mot fasta jordens fysik
- Geophysics with specialization in Solid Earth Physics
- Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
- Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Added entries (persons, corporate bodies, meetings, titles ...)
- Koyi, HeminUppsala universitet,Mineralogi, petrologi och tektonik(Swepub:uu)hemikoyi (author)
- Juhlin, ChristopherUppsala universitet,Geofysik(Swepub:uu)chrisjuh (author)
- Gessner, KlausGeol Survey Western Australia, 100 Plain St, East Perth, WA 6004, Australia,Geological Survey of Western Australia (author)
- Uppsala universitetGeofysik (creator_code:org_t)
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- In:Tectonophysics: Elsevier BV689, s. 56-660040-1951
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