scholarly journals Typomorphic features of diamonds from ancient sedimentary thick layers of platforms’ central parts

2020 ◽  
pp. 13-19
Author(s):  
M. M. Zinchuk
Keyword(s):  
Siberian Platform ◽  
Upper Mantle ◽  
Primary Sources ◽  
Complex Investigation ◽  
Upper Paleozoic ◽  
Deep Faults ◽  
Middle Paleozoic ◽  
Actual Material ◽  
Practical Conclusion ◽  
Thick Layers

Basing on generalization of large actual material on complex investigation of diamond its characteristic in Upper Paleozoic and Mesozoic sedimentary thick layers of the Siberian platform is provided. Special attention is paid to the Central-Siberian sub-province, where it is convincingly shown that the area of development of individual diamond macro-associations is limited by a specific diamondiferous region, within which complexes of different in age terrigenous and coastal Upper Paleozoic and Mesozoic sediments are developed. Identified in some diamondiferous regions proximity of typomorphic features of diamonds in sedimentary thick layers of these ages testifies about formation of these collectors due to washout of more ancient productive layers or Middle Paleozoic primary sources. Polygeny of mineralogical associations of diamonds from different in age placers within some diamondiferous regions was noted, which may be successfully used when forecasting and prospecting primary sources of the mineral. Diamond and its tipomorphic features are one of the main criteria for forecasting and searching for root sources Materials on heterogeneity of the Viljujsko-Marhinska zone of deep faults with respect to productive kimberlite magmatism, which is associated with areals of the hard consolidated basement of the Archean age (Botuobinskij and Tjungskij cratons) obtained in the framework of medium scale forecast and search studies of typomophic features of diamonds have an important practical conclusion. The results of a study of the typomorphic features of diamonds from the most well-studied kimberlite bodies indicatle heterogeneities in the structure of the upper mantle even within the Central Siberian diamondiferous subprovince, especially with respect to the distributionof focirly rare coloured crystals (II, III and IV varieties) presumably of ecbgite genesis, associated with deep diamandiferous xenoliths of various composition. These varieties of diamonds are rare and accessory in kimberlite bodies, however their findings in rashes even in a single amount, can serve as a basis for localizing the territory of the search for indigenous sources. The analysis of typomorphic features of diamonds indicates the high prospectivity of placer oceurrences of the Central Siberian diamondiferous pronnce for the discovety of new highly productive kimberlite pipes.

scholarly journals ABOUT ANCIENT SOURCES OF DIAMONDS PLACERS

2018 ◽  
pp. 44-54
Author(s):  
N. N. ZINCHUK
Keyword(s):  
Siberian Platform ◽  
Primary Sources ◽  
Complex Investigation ◽  
North East ◽  
The North ◽  
Upper Paleozoic ◽  
Middle Paleozoic ◽  
History Of ◽  
Recent Sediments ◽  
Thick Layers

Basing on generalization of large actual material on complex investigation of diamond, its characteristic in Upper Paleozoic and  Mesozoic sedimentary thick layers of the Siberian platform has been  provided. It has allowed receiving new data on composition features  and distribution of diamond in recent sediments of main  diamondiferous regions of Lena-Anabar, Central-Siberian and  Tungusskaya sub-provinces. On the north-east of Siberian platform,  the region of Kyutyungdinsky graben and nearby territories,  perspective for the discovery of rich kimberlite bodies with specific  dia- monds, are of the most interest. Special attention has been paid to the Central-Siberian sub-province, where it has been convincingly  shown that the area of development of individual diamond macro- associations is limited by a specific diamondiferous region, within  which complexes of different in age terrigenous and coastal Upper  Paleozoic and Mesozoic sediments are developed. The complex of  features of diamonds from placers of the described platform testifies  by morphology, coloration, hard inclusions, internal structure,  photoluminescence and admixture composition about plurality of  primary sources and availability of still undiscovered kimberlite  bodies within many diamondiferous regions. Application of  typomorphic features of crystals for restoration of exogenous history of diamonds on the path from primary sources to the sites of modern allocation in placers, as well as for paleogeographical reconstructions of distribution of ancient productive thick layers and clarification of  diamondiferous material drift direction, has a significant importance.  Proximity of typomorphic features of diamonds in sedimentary thick  layers of these ages, identified in some diamondiferous regions,  testifies about formation of these collectors due to washout of more  ancient productive layers or Middle Paleozoic primary sources.  Polygeny of mineralogical associations of diamonds from different in age placers within some diamondiferous regions has been noted,  which may be successfully used when forecasting and prospecting primary sources of the mineral.

scholarly journals Specific features of diamonds from ancient sedimentary thick layers on territories of crystallyne rock masses influence

2019 ◽  
pp. 22-29
Author(s):  
N. N. Zinchuk
Keyword(s):  
Siberian Platform ◽  
Rock Masses ◽  
North East ◽  
Upper Paleozoic ◽  
Thick Layers

Analysis of available materials on specific features of diamonds from Upper Paleozoic and Mesozoic sediments of main diamondiferous regions of the Siberian platform north-east (Anabar, Muna-Tyung, Nizhnelensk and Prilensk regions) allows asserting about definite in

scholarly journals Geological-structural control and criteria of forecasting the types of primary sources of placer gold on the East of Siberian platform

2018 ◽  
pp. 17-24
Author(s):  
Z. S. Nikiforova
Keyword(s):  
Siberian Platform ◽  
Structural Control ◽  
Sedimentary Cover ◽  
Rare Metal ◽  
Gold Deposits ◽  
Primary Sources ◽  
Correct Selection ◽  
Placer Gold ◽  
Deep Faults ◽  
Gold Silver

Identification of indicators on placer gold allowed predicting formation types of primary sources of gold and their location in the East Siberian platform, overlapped by thick cover of Meso-Cenozoic deposits, where traditional methods of prospecting of gold deposits are ineffective. Each gold-ore formation is known to have the corresponding geological-structural control. Based on study of mineralogical-geochemical features of placer gold and regularity of its distribution, it has been determined that primary sources of low-sulfide gold-quartz, gold-copper-porphyritic, gold-ferruginous-quartzite, gold—rare-metal and gold-platinoid formations are confined to basement outcrops and their framings; gold-sulfide-quartz formation — to metasomatites, developed within the zones of deep faults, tracing the terrigenous-carbonate series; and manifestations of gold-silver formation are localized in the zones of intracontinental paleorifts. In general, identification of geological-structural location of specific types of gold sources favors more correct selection of prospecting methods for gold deposits in areas with thick sedimentary cover, and evaluating their potential.

scholarly journals Specific features of kimberlites of Mirny field (Sibirian platform)

2019 ◽  
pp. 39-50
Author(s):  
N. N. Zinchuk ◽  
V. I. Koptil
Keyword(s):  
Primary Sources ◽  
Complex Investigation ◽  
The Third ◽  
History Of ◽  
Kimberlite Field ◽  
Thick Layers ◽  
Important Significance ◽  
The Way

Results of comparative complex investigation are provided for diamonds from primary bodies of Mirny kimberlite field, among which three groups are distinguished sharply differing by typomorphic features of crystals, related with three separated in time phases of diamondiferous magmatism (I — vein A-21; II— pipes Taezhnaya and Amakinskaya; III — pipes Mir, International, XXIII-rd CPSU Congress, Dachnaya and Sputnik). For the first earliest group low content of octahedral is typical, with prevalence of individuals of rhombic dodecahedral habit; the second group is noted for approximately equal ratio of octahedral and rhombic dodecahedral habit crystals; sharp prevalence of coarse-laminar crystals of octahedral and transitive from it to rhombic dodecahedral habit is characteristic for the third group of most high-productive diatremes. Utilization of typomorphic features of crystals for reconstruction of exogenous history of diamonds on the way from primary sources to the places of modern location in placers, for paleogeographial reconstructions of ancient productive thick layers' reconstructions and clearing out directions of diamondiferous material drift, which will promote prospecting of their primary sources, has important significance.

Morphogenetic features of garnets from Dyukunakh placer (Yakutian diamondiferous province)

2021 ◽  
pp. 106-112
Author(s):  
Elvira Vlasova ◽  
Aleksandr Khmelkov
Keyword(s):  
Morphological Characters ◽  
Morphological Features ◽  
Primary Sources ◽  
Residual Soil ◽  
Coastal Marine ◽  
Upper Paleozoic ◽  
Morphogenetic Analysis

Morphological features of garnets from the Upper Paleozoic Dyukunakh placer were studied and the conditions of their morphogenesis were interpreted. As a result of the morphogenetic analysis, it was found that garnets have evolved in exogenous conditions, including extreme wear in coastal marine conditions and repeated redeposition. In addition, garnets underwent significant hypergene corrosion in the residual soil and subsequent dissolution under metasomatic conditions. As a result of such exogenous evolution, no trace of their primary morphological characters associated with the deep stage of morphogenesis remained on garnets. For this reason, it is impossible to quantify the degree of primary sources removal.

Comparative characteristics of Middle Paleozoic and Late Riphean plume magmatism of the Siberian platform

2010 ◽  
Vol 430 (1) ◽  
pp. 1-8 ◽  
Author(s):  
A. I. Kiselev ◽  
V. V. Yarmolyuk ◽  
I. I. Kolodeznikov
Keyword(s):  
Siberian Platform ◽  
Middle Paleozoic ◽  
Plume Magmatism

scholarly journals GENERATION CONDITIONS AND OCCURRENCE REGULARITIES OF THE BORATE IN THE PERMIAN HALOID BASIN WITHIN THE CASPIAN DEPRESSION

2017 ◽  
pp. 28-35
Author(s):  
M. V. Solomon ◽  
O. P. Goncharenko
Keyword(s):  
East European ◽  
Genetic Groups ◽  
Sodium Calcium ◽  
South West ◽  
Deep Faults ◽  
Boron Minerals ◽  
Caspian Depression ◽  
Actual Material

The actual material on the distribution of the borates in Permian boron-ore provinces in the East European basin is characterized. An analysis of the distribution of boron minerals in the saliferous layers of the Caspian Depression shows that their composition has varied significantly from magnesium (western part of the basin) to the magnesium-calcium and strontium (South-West) to sodium-calcium, and possibly sodium (South). The main sources of the boron were concentrated sea brine and presumably thermal solutions which could go to the basin along the system of the intersecting deep faults. Given the lithological association of borates to evaporite deposits in haloid basins, the four genetic groups of boron minerals have been identified: evaporite, supergene, «through», presumably volcanogenic-sedimentary.

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