Main Features Of The Geodynamic Evolution Of Domesozoic Formations And Metallogenic Zoning Of Endogenous Gold Mineralization Of The Tien-Shan Origenic Vein System

Geochemical testing covered the entire territory of Uzbekistan, but with varying degrees of detail. Most, 85-88% of the republic's area is covered with Mesozoic and Cenozoic sediments, with which exogenous deposits are associated. Pre-Mesozoic formations the environment of localization of endogenous deposits, confined to the mountain systems of the Median and South Tien Shan. Mountain heights with outcrops of Pre-Mesozoic rocks occupy about 12-15% in area, the rest is in semiclosed and closed territories. Primary halos are recorded on the surface and at depth, secondary ones on the surface, as well as near it: below the raft in water, above in the surface atmosphere. Improving forecasting efficiency in regional geochemical works, interpretation and assessment of different-rank ore-generating geochemical anomalies in complex landscape-geological conditions.

In 1993-1997. A geodynamic map of the territory of Uzbekistan at a scale of 1:500 000 was compiled with the aim of conducting metallogenic analysis from the standpoint of the concept of tectonics of lithospheric plates and compiling a predictive metallogenic map for gold (Kazakbaeva S.M., Golovanov I.M., Horvat V.A., etc., 1997). Basic geological base -Geological map of the Republic of Uzbekistan at a scale of 1:500 000 (Mikhailov, Kozyrev et al., 1993). The main tectonic unit is a structuralmaterial complex -which is a set of paragenetically related sedimentary, volcanogenic and intrusive formations that make up a certain tectonic structure formed in a specific geodynamic setting. The structuralmaterial complex is formed by material series that allow restoring the geodynamic modes of interaction and development of lithospheric plates -intraplate continental development, expansion, convergence and collision. The time of manifestation of a certain geodynamic regime corresponds to the stage of geodynamic development, and qualitative changes in it correspond to its stages.

MATERIALS AND METHODS
Stage I -the stage of intraplate development of the ancient continental crust, up to PR3. The features of the Proterozoic metamorphic and magmatic complexes of the Tien Shan territory suggest that by the end of the Proterozoic a continental type crust had formed, and ancient crystalline and metamorphic formations were destroyed and eroded.
Stage II -stretching of lithospheric plates (riftogenic) -PR3? As a result of the ascent of the heated anomalous mantle under the ancient continental crust of the Kazakhstan paleocontinent, the fragile part of the crust is stretched and split. A rift structure is being formed, dividing the paleocontinent into two parts -the Kyrgyz-Kazakh and Karakum-Tajik microcontinent.
A. The stage of the formation of the Turkestan paleooceanic space and the formation of passive continental margins PR3-R2-3-V. Active The American Journal of Applied Sciences (ISSN -2689-0992) Published: October 31, 2020 | Pages: 70-82 Doi: https://doi.org/10.37547/tajas/Volume02Issue10-12 IMPACT FACTOR 2020: 5. 276 OCLC -1121105553 processes in the mantle lead to the expansion of the continental crust and the formation of a spreading zone, which is associated with sedimentary-volcanogenic geological formations. Further expansion leads to the expansion of the oceanic space with the deposition of metavolcanic-layered-carbonatesiliceous formation at the periphery of the spreading basin.
B. The stage of maximum opening of the Turkestan paleooceanic space, early subduction and the emergence of active continental margins Є-O2-3. The ocean is getting its maximum size. Active spreading in the center produces the accumulation of the ophiolite complex. In the conditions of intraoceanic troughs and uplifts, the accumulation of carbonate-siliceousterrigenous strata took place, in the marginal oceanic -flyschoid terrigenous strata. In the south, the first underthrust and subduction of the oceanic crust is recorded under the Karakum-Tajik microcontinent, and the Obizarang ensialic island arc is formed. The outskirts of the Kyrgyz-Kazakh continent remain passive at this time.
A. The stage of partial reduction of the Turkestan paleospace, the initiation of the ensimatic island arc and the formation of the active margin of the Karakum-Tajik microcontinent O2-3-S1. The expansion of the paleoceanic space is replaced by its contraction. Subduction zones appear at the edges of the ocean. In the south, the Karakumo-Tajik microcontinent is built up by an accretionary wedge and, with continued subduction, ensialic island arcs (O2-3) are formed. Terrigenous sedimentation (O3-S1) continues on the marginal oceanic uplifts. The ensimatic island arc (Kushkumbai, Baimen) originates in the ocean. The northern subduction zone is built up by an accretionary wedge, and a deep-sea trench is formed.
B. The stage of completion of the active development of the Turkestan paleospace and the beginning of the formation of a magmatic arc on the active margin of the Andean type. S2 -D1. On the southern shoulder of the ocean, the origin and development of the accretionary wedge of the Katarmai rift (ankaramittrachybasalt formation) occurs, and shelf deposits are formed. Subduction in the north contributed to the formation of a magmatic arc. Compression of paleoceanic space leads to crowding and regional metamorphism. The spreading zone is terminated. B. Stage of maturation of the cortex and postcollisional activation of C3-P. The maturation (stabilization) of the newly formed continental crust (South Tien-Shan) as a result of one-sided compression proceeds against the background of fold-block rearrangement, which manifested itself in the adoption of a close-tovertical position of the shaded nappes, the emergence of a system of deep diagonal faults and renewal of transform and inter-cover disturbances, crumples, often embedded in early interformational structures of shaping ( Fig. 1). Tectonic structures form a drainage network, providing deep permeability of the lithosphere, and serve as outflow channels for magmas that form granitoids of I-, S-and Atypes. Inland rifts (Kyzylnura) and type A granitoids are formed on the Kyrgyz-Kazakh continent. The Karakumo-Tajikistan continent -the Khanaka complex -is developing in a similar way.

VI.
Stage of intraplate continental development P2-T. Penetration of the young orogen is accompanied by tectonic movements of a reverse-strike-slip nature, predominantly northeastern, intrusion of alkaline basaltoid dikes and explosion pipes of the South Tien Shan complex. The geodynamic map reflects the location and tectonic elements at the stage of intraplate development. As a unit of events unrepeatable in the history of geodynamic development, each structural-material complex has a specific composition and structure inherent only to it, participating in the entire further history of the development and formation of structures of specific territories.
Tectonic zoning, carried out on the basis of an analysis of the history of the development of structural-material complexes, makes it possible to distinguish the following pre-Mesozoic structural elements, which, in fact, are geodynamic complexes of three orders (Fig. 1 The history of each geodynamic complex is considered from the point of view of the contribution and influence of geodynamic environments on the formation of gold concentrations in the ore-preparation period, synchronous with ore deposition and post-ore. Metallogenic zoning is based on a spatial analysis of ore-forming factors and their signs and gold productivity geodynamic complexes (Fig. 2).
On the territory of Uzbekistan, three goldbearing metallogenic provinces have been identified -the Sredinnotyan (Kyrgyz and Kazakhstan), South-Tyan-Shan (Turkestan), III -Southwest-Western (Karakum And Tajik), positionally coinciding with the geodynamic complexes of the I order: collisional compression -accretionary prism -for the Late Hercynian period), the Karakum-Tajik microcontinent.
Metallogenic zones reflect the oregeochemical specialization of large blocks of the earth's crust for gold rank II order geodynamic complexes and include the most productive III order geodynamic complexes. Thirteen metallogenic zones have been identified, of which three with intensive gold mineralization (Kuramin, Kyzylkum, Zarafshan and Turkestan, which have northern and southern branches), nine metallogenic zones with extensive gold and gold-bearing mineralization, and one potential metallogenic zones (Beltau cover) (covered by cover) Mesozoic-Cenozoic deposits.

RESULT AND DISCUSSION
Metallogenic zones of intense gold mineralization.
I.1. Kuraminsk -the nature of gold content is mainly concentrated in ore clusters, where it is represented by traditional volcanogenichydrothermal mineralization associated with the basic gold-copper-porphyry formation; there are numerous manifestations of goldcomplex mineralization of other ore formations.
II.6. Kyzylkum -represents the "ore axis" of the South Tien Shan, and ore regions -two gold concentrates. The character of gold content is mainly concentrated, mainly in ore zones, where the entire horizontal row of ore formations, traditional for Western Uzbekistan, is manifested; unconventional mineralization such as organo-gold or intermetallic compounds can be manifested in zones of deeply penetrating faults with deep carbonaceous matter.
II.8. Zarafshan-Turkestan -is, as it were, the eastern continuation of the "ore axis" of the Southern Tien Shan, breaking up into a number of branches -ore zones and potential ore zones. In the ore zones, the Kyzylkum series of ore formations is concentrated, in a predominant vein-vein expression. It is possible to reveal the final ore link -gold-silver mineralization, which is still absent in industrial parameters. Under the conditions of increased compression of the Nurata segment, unconventional mineralization is possible in granitoids, quartzites, and other brittle rocks (Kirkland Lake type). Metallogenic zones of extensive gold and goldbearing mineralization.
I.2. Chatkal -dispersed; gold in an impurity form is found in ore objects of various genetic groups and metals; own deposits are few in number and are of interest for artisanal mining.  Zoning was carried out according to the conditions of geochemical work, taking into account landscape conditions, types of geochemical halos and the depth of the Pre-Mesozoic basement.
Ortho-eluvia autochthonous geochemical landscapes within mountain elevations and landscape areas are most favorable for carrying out lithochemical searches in primary halos, secondary halos and scattering streams.
Thematic work on the compilation of a map of geochemical zoning at a scale of 1:200,000 included a set of studies. The regional background was calculated for 18 chemical elements. Formation geochemical analysis and determination of the geochemical specialization of rocks were carried out for the geodynamic complexes of the fold-nappe formations of the Turkestan paleoocean. Geochemical models of ore fields of the main types of gold mineralization have been developed, elements-indicators of endogenous mineralization of various oreformational affiliation have been determined. A common feature of the distribution of halos of chemical elements is the zonal geochemical structure, characteristic of ore-geochemical systems with a convective mechanism of substance differentiation. Based on the stable manifestation of the zonal distribution of geochemical halos in the reference gold fields, this informative feature can be considered as a structural-geochemical predictive criterion.
The automated processing of the areal database was carried out using the methods of multivariate statistical analysis (Statistica-6) and spatial visualization of monoelement halos and geochemical associations (GoldenSurfer, WinGeoScan).

CONCLUSION
The geochemical zoning map shows geological formations with different specialization and contrasting distribution of siderophilic, lithophilic, chalcophilic groups of elements in rocks as a potential source of ore components. As a result of a comprehensive interpretation of geological and geochemical information, 35 geochemical nodes and zones with a disturbed primary distribution of elements with known and predicted mineralization of noble, nonferrous and rare metals were identified, of which 17 are within mountain elevations and 18 are in closed areas with a depth of the pre-Mesozoic basement 100-1100 m. A feature of the focal geochemical structures controlled by intrusive bodies is the presence of combined geochemical halos accompanying the early, high-temperature copper-nickel (Cu, Ni, Co, Cr, Au, Pt) rare metal (W, Sn, Mo, Bi, Ta , Nb, Be, Li) and medium-low-temperature gold (Au, As, Zn, Cu, As, Pb, Sb, etc.) mineralization. Linear geochemical structures are developed along