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Genesis of Cu-Au mineralisation in the Cambrian Barkly River Greenstones, Victoria, Australia
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
F.P. Bierlein, A.A. Morey, D.P. Cherry, G. Turner
The western sub-province of the Lachlan Orogen, which forms part of a Paleozoic orogenic system that extends along the entire Pacific margin of Australia, extends across most of central and western Victoria and into northeastern Tasmania. The stratigraphic sequence is dominated by a 6 - 10 kilometre-thick Cambro-Ordo vician to Devonian turbidite succession. The Palaeozoic sedimentary rocks are underlain by a 1 to 1.5 kilometre-thick sequence of Cambrian volcanogenics with island-arc affinities (Crawford, 1988). Initial folding and thrust faulting of the sequence occurred during regional deformation in the Late Ordovician – Early Silurian and the overall style of deformation suggests a predominantly east-vergent fold-and-thrust belt that developed in response to thin-skinned style crustal shortening (Cox et al. 1991). The western Lachlan Orogen has been sub-divided into several distinct zones or terranes, which record different stratigraphic and tectonic histories (Fig. 1).
Comparative analysis of GIS and RS based models for delineation of groundwater potential zone mapping
Published in Geomatics, Natural Hazards and Risk, 2023
Fakhrul Islam, Aqil Tariq, Rufat Guluzade, Na Zhao, Safeer Ullah Shah, Matee Ullah, Mian Luqman Hussain, Muhammad Nasar Ahmad, Abdulrahman Alasmari, Fahad M. Alzuaibr, Ahmad El Askary, Muhammad Aslam
The current research is conducted in district Kohat, situated in the southern part of Khyber Pakhtunkhwa (KPK), Pakistan. The Kohat region is geographically extended from 33° 35′ 13″ 33° 49′ 73″ N and 71° 52′ 49″ E to 71° 26′ 32″ (Figure 1a–c) (Hussain 2014). The study area occurred at an elevation of about 2000 m. Climatically the research region is considered a limited steppe climate region with slight precipitation throughout the year. In Kohat District, the summers are long, hot, humid, and clear, while the winters are brief, cold, and mostly clear. Both seasons have clear skies. Temperatures below −0.5 °C or above 43.33 °C are extremely uncommon throughout the year. On average, the temperature ranges from 2.2 °C to 39.45 °C (Azra et al. 2019). Geologically the current study area is situated in Kohat Plateau. The study area includes fold and thrust belt collections which are thin-skinned structures covered by thick-skinned structures. Compressional structures subject a significant portion of the plateau; however, the strike-slip faulting is limited to the southern Kohat plateau (Hussain and Zhang 2018). The Kohat plateau is mainly occupied by lithologies of Eocene limestone, shale, evaporates, and subordinate clays, and younger clastic sedimentary rocks of the Miocene–Pliocene age (Hussain et al. 2021). The age of sedimentary rocks in the plateau is composed of Paleocene to Pliocene, which was first deposited on the northern Indian plate margin (Tariq and Qin 2023).
Seismic risk analysis of a data communication network
Published in Sustainable and Resilient Infrastructure, 2022
Simona Esposito, Alessio Botta, Melania De Falco, Adriana Pacifico, Eugenio Chioccarelli, Antonio Pescapè, Antonio Santo, Iunio Iervolino
The network crosses a wide area along relevant expressways passing for the main cities of Campania region. It lies on different geological formations, eventually characterized by the presence of a groundwater level in the shallower layers, which can affect the seismic site response analysis and the occurrence of landslides and liquefaction phenomena. The study area is in the southern Apennines, a fold and thrust belt mainly made of imbricated sheeted of limestones and flysch deposits. Its formation started during the Miocene orogenesis and lasted in the whole Quaternary, when the geological setting was furtherly articulated by the extensional tectonics due to the opening of the Tyrrhenian Sea (Patacca & Scandone, 2007). Figure 3a shows the RIMIC track and the intersected geolithological complexes, mainly located in plains and riverine contexts and only in few cases along slopes (slope angles are identified in Figure 3b). The shallower layers (2–3 m depth) are constituted by pyroclastic materials, debris, paleosoils, and infillings, but for the scale of this study (1:100.000), only the geologic bedrock was considered. The concrete rigid structures (tunnels and bridges), on which the network can be located, were neglected too.
A review of the occurrence of and potential for jade in the New Guinea Mobile Belt
Published in Australian Journal of Earth Sciences, 2022
The New Guinea Mobile Belt (NGMB) was defined by Dow et al. (1972) as a highly deformed zone of regional extent, extending the 2200 km length of the New Guinea Cordillera and consisting of a complex system of great faults with vertical displacements up to 8000 m (Figure 1). The belt separates folded platform sequences underlain by crystalline rocks of the Australian Plate to the south and oceanic crust and island arcs to the north and northeast (Bain, 1973; Dow, 1977). The mobile belt, herein, includes rock assemblages along the northern margin of New Guinea, extending westwards into Papua to Vogelkop, and the Papuan Ultramafic Belt (Figure 1). Davies (1982), Hamilton (1979) and Rogerson et al. (1987) challenged these views of the mobile zone and suggested the belt of deformed rocks to be a thrust-stacked belt of metamorphic and intrusive rocks, Miocene volcanics and sediments, and including two great ophiolites. Rogerson et al. (1987) referred to the western and eastern segments of the thrust belt in PNG, respectively, as the New Guinea Thrust Belt and the Owen Stanley Thrust Belt. In his recent review of the geology of New Guinea, Davies (2012) informally referred to the NGMB as the ‘great fold and thrust belt’.