Oval deformation of the structure of the ore region of Nampaten (Laos)B. Souvannoudom, V. B. Boltyrov, Е. A. Slobodchikov |
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DOI http://dx.doi.org/10.21440/2307-2091-2018-2-41-48
B. Souvannoudom et al. / News of the Ural State Mining University 2 (2018) 41-48
Relevance of the work: the revealed regularities of spatial connection of ore deposits in South-East Asia with oval forms of relief allow simplifying the technique of prospecting works and reducing the cost of their conduct. The purpose of the work was the theoretical justification of the spatial context of industrial endogenous tin mineralization with oval forms of the relief. This context was identified as a result of search operations carried out under the leadership of B. Souvannoudom according to his original technique.
Research methodology. The natural connections of ore objects with oval forms of a relief revealed during prospecting works are proved by their combination with features of a geological structure of a rock substrate. These connections are theoretically explained with the help of the ideas about the deformation processes which are in progress in a tectonosphere of the Earth.
Research results. As a result of the research conducted, the conclusion was made about the primary tectonic nature of the oval structures. They appear as a result of the spatial superposition of multi-age and multi-oriented deformation structures. Such structures include cleavage zones and confusion zones. They are manifested in the rock complexes in a discrete and multi-scale way in accordance with the universal principle of the separability of geomaterials. In accordance with this principle, the rock complexes of the entire territory under consideration were initially divided into tectonic blocks. The size of these blocks varies from hundreds of kilometers to hundreds of meters in diameter, spatially subordinated to hierarchical dependence. Each of the blocks of all scale ranks consists of 9 blocks of the nearest smaller rank. Climbing-shear bias at later confusion zones in terms of the transpressive compression caused the formation of the fledging gaps. They occurred in the wings of confusion zones and in the wings of the earlier zones of cleavage. This, along with the extrusion of the tectonic blocks, led to their rounding and the formation of technoblogs of different sizes of antiform and synform appearance. Inside the technoblogs of the S-shaped overlapping discontinuous structures that control magma genesis and ore genesis. In this regard, the ore-controlling structures of the same rank coincide with many oval structures of each scale rank spatially. One of the large oval structures is an oval-megachilinae (ore area) of Nampaten. Its diameter is about 30 km within a developed oval structure of three major grades, of which the smallest are oval structures with a size of about 1 km, covering tin deposits. Modern fluvial processes, due to the different degree of destruction of rocks in the center technoblog and their limitations, formed oval shaped positive and negative landforms of different scales.
Summary. The spatial relationship of endogenous ore objects with the oval forms of modern relief is due to the imposition of modern fluvial relief on previously formed oval deformation structures, accompanied by endogenous mineralization.
Keywords: zones of sending; zones of crushing of the climbing-shear nature; hierarchical divisibility of geomaterials; oval and sigmoidal deformation structures; sintectonic magmatism and ore genesis.
REFERENCES
1. Kocharyan G. G. 2016, Geomekhanika razlomov [Geomechanics of faults]. Moscow, 424 p.
2. Souvannoudom B., Boltyrov B. V., Slobodchikov E. A. 2014, Strukturnyye usloviya obrazovaniya i stroyeniye oval-antiklinoriya Khinbun (Sredniy Laos) [Structural conditions for the formation and structure of oval-anticlinorium of Hinboun (Middle Laos)]. Litosfera [Litosfera], no. 1, pp. 127–132.
3. Makarov P. V. 2004, Ob iyerarkhicheskoy prirode deformatsii i razrusheniya tverdykh tel i sred [On the hierarchical nature of deformation and fracture of solids and media]. Fizicheskaya mezomekhanika [Physical mesomechanics], vol. 7, no. 4, pp. 25–34.
4. Makarov P. V., Trubitsyn A. A., Trubitsyna N. V. and others 2007, Universalnyy kriteriy fraktalnoy delimosti geomaterialov i geosred [Universal criterion of fractal divisibility of geomaterials and geospatials]. Geologiya i geofizika [Russian Geology and Geophysics], vol. 48, no. 7, pp. 724–746.
5. Sherman S. I. 2012, Destruktsiya litosfery: razlomno-blokovaya delimost’ i yeyo tektonofizicheskiye zakonomernosti [The destruction of the lithosphere: fault-block divisibility and its tectonophysical regularities]. Geodinamika i tektonofizika [Geodynamics and Tectonophysics], vol. 3, no. 4, pp. 315–344.
6. Bykov V. G. 2005, Deformatsionnyye volny Zemli [Strain waves of the Earth]. Geologiya i geofizika [Russian Geology and Geophysics], vol. 46, no. 4, pp. 1176–1190.
7. Zuyev L. B., Danilov V. I. 2003, Medlennyye avtovolnovyye protsessy pri deformatsii tverdykh tel [Slow autowave processes at deformation of solids]. Fizicheskaya mezomekhanika [Physical mesomechanics], vol. 6, no. 1, pp. 75–94.
8. Sherman S. I., Gorbunova E. A. 2008, Volnovaya priroda aktivizatsii razlomov Tsentral’noy Azii na baze seysmicheskogo monitoringa [Wave nature of fault activation in the Central Asia on the basis of seismic monitoring]. Fizicheskaya mezomekhanika [Physical Mesomechanics], vol. 11, no. 1, pp. 115–122.
9. Makarov P. V., Peryshkin A. Y. The role of slow deformation waves in the formation of fracture foci. AIP Conference Proceedings. Vol. 1785, 18 November 2016, 10 th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures, MRDMS 2016; Ekaterinburg; Russian Federation; 16 May 2016 to 20 May 2016.
10. Makarov P. V., Peryshkin A. Y. Modeling “slow movements” – Auto waves of non-elastic deformation in ductile and brittle material and media. AIP Conference Proceedings. Vol. 1683, 27 October 2015, International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2015; Tomsk; Russian Federation; 21 September 2015 to 25 September 2015.
11. Kocharyan G. G. and Spivak A. A. 2003, Dinamika deformirovaniya blochnykh massivov gornykh porod [Dynamics of deformation of block rock masses]. Moscow, 423 p.
12. Martynyuk P. A., Cher E. N. 2004, Osobennosti formirovaniya treshchin otryva v gornykh porodakh pri szhatii [Features of the formation of separation cracks in rocks under compression] FTPRPI [Journal of Mining Science], no. 6, pp. 77–87.
13. Pham Cu Tien et al. 1991, Geological map of Vietnam, Laos and Cambodia. Department of Geology and Mineral Resources, Lao PDR.
14. Souvannoudom B. Hydrothermal Au mineralization associated with felsic volcanic Coeval alkaline intrusive / Syntectonic grabben fault in indochines depression (rifts) of Indochinese massif: presentation at the mining conference of Newmont Mining Limited (US Company) held in Vientiane, Lao PDR. 1995.
15. Souvannoudom B. Indochina terrane (and adjacent territories: Laos, Vietnam, Thailand and Cambodia), trans-regional structures and
associated different metallogeny: Presentation at the second Lao-Thai Technical Conference on Geology and Mineral Resources (Lao-Thai Geology: Beyond the Bound). 17–21 January 2013, Vientiane, Lao PDR.
16. Bedeaux P., Pilote P., Rafini S. 2017, Synthesis of the structurale evolution and associated gold mineralization of the Cadillac Fault, Abitibi, Canada (Review). Ore Geology Reviews, vol. 82, pp. 49–69.
17. Moody G. D., Hill M. I. 1968, Sdvigovaya tektonika [Shear tectonics]. Voprosy sovremennoy zarubezhnoy tektoniki: per s angl. [Issues of modern foreign tectonics: translation from English]. Moscow, pp. 265–333.
