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Статті в журналах з теми "Tectono-metallogenic model"
Jiang, Hongjun, Chunsi Yang, Dequan Wang, Hui Zheng, Jie Li, and Huayong Chen. "Multiple-Stage Mineralization in the Huayangchuan U−REE−Mo−Cu−Fe Ore Belt of the Qinling Orogen, Central China: Geological and Re−Os Geochronological Constraints." Journal of Earth Science 33, no. 1 (February 2022): 193–204. http://dx.doi.org/10.1007/s12583-021-1557-1.
Повний текст джерелаLi, Bo, Wen Bo Wei, and Le Tian Zhang. "Electrical Structure Revealed by Magnetotelluric Data at the East Part of Central Asian Orogenic Belt, Central Inner Mongolia." Applied Mechanics and Materials 448-453 (October 2013): 3788–91. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3788.
Повний текст джерелаAn, Weicai, Chunji Xue, Yun Zhao, Chao Li, Dengfeng Xu, and Bo Chen. "Petrogenesis and Tectonic Implications of Late Carboniferous Intrusions in the Tuwu-Yandong Porphyry Cu Belt (NW China): Constraints from Geochronology, Geochemistry and Sr–Nd–Hf Isotopes." Minerals 12, no. 12 (December 7, 2022): 1573. http://dx.doi.org/10.3390/min12121573.
Повний текст джерелаBogossian, Jessica, Anthony I. S. Kemp, and Steffen G. Hagemann. "Linking Gold Systems to the Crust-Mantle Evolution of Archean Crust in Central Brazil." Minerals 11, no. 9 (August 30, 2021): 944. http://dx.doi.org/10.3390/min11090944.
Повний текст джерелаДисертації з теми "Tectono-metallogenic model"
Grare, Alexis. "Tectono-metallogenic model of the Kiggavik uranium deposits, Nunavut, Canada." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS628.
Повний текст джерелаThe Paleoproterozoic to Mesoproterozoic (1750–1500 Ma) Athabasca (Saskatchewan) and Thelon (Nunavut) basins, Canada, host world-class high-grade uranium deposits. However, while being prospective, the Thelon Basin has been much less accessible and studied to date. The Kiggavik area, on the eastern border of the Thelon Basin was intensively explored by AREVA Resources Canada (ARC) until 2016, and hosts significant fracture-controlled uranium resources. Understanding the genesis, structural controls and timing of the mineralization is crucial to better understand the development and location of these deposits, and therefore to improve exploration strategies in this uranium district. This work focuses on the study of the complex multiphase fault and fracture network associated with uranium mineralization in the Kiggavik area. It consists in an integrated and multiscale study combining meso- and microstructural analyses from field and drill cores with petrological, geochemical and geochronological analyses. Geophysical and geological data from the recently discovered Contact prospect as well as from other nearby deposits and prospects enabled us to decipher the tectono-metallogenic multi-stage model at the scale of the entire Kiggavik area. Our results show that the main ENE-WSW and NE-SW fault zones formed earlier during the Thelon and Trans-Hudsonian orogenies and were mineralized in four stages, U0, U1, U2, U3, with distinctive fracture, alteration and mineralization patterns. U0, inferred of magmatic origin, likely occurred at ca. 1830 Ma and is related to micro-brecciation and weak clay-alteration under a yet poorly constrained stress, likely a WSW-ENE shortening. This event is followed by intense quartz brecciation, iron oxidation and veining at ca. 1750 Ma. This silicifying event that predates deposition of the Thelon formation is of magmatic epithermal origin; it caused pervasive silicification of former fault zones, giving birth to the so-called Quartz Breccia that compartimentalized subsequent fracturing and behaved as a barrier for mineralizing fluids. Both the U0 mineralization and the subsequent silicifying events reflect the importance of pre-Thelon magmatic-related fracturing/fluid circulation events on controlling the future development and location of later unconformity-type uranium deposits. U1, U2 and U3 postdate deposition of the Thelon formation; U1 and U2 mineralization events are associated with two fracturing stages that occurred in response to a far-field stress that evolved from WNW-ESE σ1 and NNW-SSE σ3 to NE-SW σ1 and NW-SE σ3, respectively; both formed at ~1500-1300 Ma and are related to circulation of Thelon-derived U-bearing basinal brines. A post U1/U2, but pre-MacKenzie dikes, NE-SW oriented extensional stress caused the normal-dextral offset of the orebodies by reactivating NNW-SSE and E-W faults. This fracturing event triggered circulation of hot acidic fluids, desilicifying, illitizing and bleaching the host-rock, remobilizing and reprecipitating previous uranium stock. U3 is linked to uranium redistribution/reconcentration along redox fronts and occurred through weak reopening of the fracture network enhancing percolation of meteoric fluids at 500-300 Ma. Our study shows that unlike in the Athabasca Basin where uranium deposits are unconformity-related in type and where clay alteration halos are spatially and genetically associated to ore bodies, in the Kiggavik area (1) uranium deposits are of mixed type evolving from magmatic-related (U0) to unconformity-related (U1-U2), with a final perturbation by meteoric fluid percolation (U3), and (2) the strongest clay alteration event postdates the main stages of mineralization (U0 to U2). Our study also emphasizes the need of accurate structural analyses combined with petro-geochemical and geochronological studies to better constrain the genesis and the structural plumbing responsible for ore deposits formation and to help provide more [...]