scholarly journals Methodological aspects of regional metallogenic analysis

2021 ◽  
pp. 106-113
Author(s):  
KONTAR Efim Semenovich ◽  
Keyword(s):  
Quantitative Assessment ◽  
Geological History ◽  
Ore Formation ◽  
Conceptual Base ◽  
Structural Formation ◽  
The Earth ◽  
Mineral Associations ◽  
History Of ◽  
Methodological Aspects ◽  
Natural Component

Relevance and purpose of the work are due to the need to formulate the conceptual base and essence that determine the methodology of regional metallogenic analysis. Results. The fundamental provisions that make up the methodological and conceptual-semantic basis of the regional metallogenic analysis have been determined and concretized. The conceptual basis of regional metallogenic analysis is the provision that the ore (deposit) is included as a natural component in certain structural-material associations (or complexes), i.e., in certain formations of igneous, sedimentary and metamorphic rocks. They are objectively existing and actually mapped geological bodies, which are expressed both in the form of stratified (series, formations, strata, packs, horizons) and intrusive (massifs) formations. On their basis, structural-formation (structuralmetallogenic) zoning is carried out. An important feature of magmatic, sedimentary and ore formations is their recurrence in the geological history of mobile belts, which confirms the concept of the conservatism of metallogenic processes in the geological history of the Earth. At the same time, along with repetitive ones, there are magmatic, sedimentary and ore formations formed in the geological history of the Earth only once. Lateral and vertical rows of rock and ore paragenetic associations are characterized. Examples of Caledonian and Hercynian lateral ore-formation series of the Urals are given. The main provisions of the quantitative assessment of the predicted resources of the predicted types of minerals are formulated. Conclusions. The regional metallogenic analysis consists of the following components: petro-lithoformational analysis, structural-formational zoning which is adequate to structural-metallogenic zoning, paragenetic analysis of mineral associations and geological-industrial typification of various-scale occurrences of a mineral, and quantitative assessment of expected mineralization predicted resources.

Epochs of zinc–lead ore formation in the geological history of the Earth

2015 ◽  
Vol 70 (3) ◽  
pp. 240-249 ◽  
Author(s):  
A. L. Dergachev ◽  
A. A. Dergachev ◽  
N. I. Eremin
Keyword(s):  
Geological History ◽  
Ore Formation ◽  
The Earth ◽  
History Of

LEONARDO DA VINCI’S AND NICOLAUS STENO’S GEOLOGY

2021 ◽  
Vol 40 (2) ◽  
pp. 293-331
Author(s):  
GIAN BATTISTA VAI
Keyword(s):  
Comparative Evaluation ◽  
Geological History ◽  
Basic Principles ◽  
Founding Fathers ◽  
Angular Unconformity ◽  
Geologic Time ◽  
The Earth ◽  
Relative Chronology ◽  
History Of ◽  
Do So

Anniversaries for the two founding fathers of geology occurring in the same year prompted a comparative evaluation of how the two contributed to establishing the basic principles of the discipline. To do so, passages from their publications, codices and manuscripts have been quoted directly. The Stenonian principles (‘original horizontality’, ‘original continuity’, and ‘superposition of individual strata’) are present in Leonardo’s notebooks amazingly formulated, using similar wording when studying the same area more than 150 years earlier. Also, Stenonian priority in naming and explaining geological concepts and processes (e.g., faulting, folding, angular unconformity, relative chronology) are mirrored in Leonardo’s writings and pictorial works. While Steno enjoys priority in stepwise restoration of the geological history of a given region, Leonardo was the first to construct a 3D geological profile representation and geomorphologic maps. Lastly, the paper focuses on diverging stances of the two savants about the Noachian Deluge and the age of the Earth. Already 500 years ago, Leonardo had solved the question of marine fossil remains of organic origin found in the mountains implying the possibility of deep geologic time in a statement of ‘eternalism’. 350 years ago, Steno solved the same question in a different way in which he retained a basic role for the Deluge and assumed a short age for the Earth by focusing mainly on short-lived sedimentary and geomorphologic processes.

scholarly journals V. Notes on Charnwood forest

1865 ◽  
Vol 2 (17) ◽  
pp. 498-501
Author(s):  
D. Mackintosh
Keyword(s):  
Geological History ◽  
Red Sandstone ◽  
The Earth ◽  
History Of

In the midst of a comparatively tame and highly cultivated plain of New Red Sandstone near the centre of England, there rises up a part of the under crust of the earth which presents so much the appearance of an island as to lead the imagination at once to those remote ages when its porphyritic Peaks and Syenitic Knolls were surrounded by the sea. The geological history of this celebrated spot has been skilfully unravelled by Professors Sedgwick and Jukes (Article in Potters's Charnwood Forest); the Rev. W. H. Coleman (Article in White'Directory); Mr. Edward Hull (Memoirs of Geol. Survey); and others.

scholarly journals On the Devonian age of the World

The Geologist ◽  
1861 ◽  
Vol 4 (8) ◽  
pp. 332-347
Author(s):  
W. Pengelly
Keyword(s):  
Thermal Conditions ◽  
The Sun ◽  
Geological History ◽  
Geological Time ◽  
The Earth ◽  
The World ◽  
Astronomical Time ◽  
History Of ◽  
Time Required ◽  
Devonian Age

The rooks composing the earth's crust contain a history and represent time—a history of changes numerous, varied, and important: changes in the distribution of land and water; in the thermal conditions of the world; and in the character of the organic tribes which have successively peopled it. The time required for these mutations must have been vast beyond human comprehension, requiring, for its expression, units of a higher order than years or centuries. In the existing state of our knowledge it is impossible to convert geological into astronomical time: it is at present, and perhaps always will be, beyond our power to determine how many rotations on its axis, or how many revolutions round the sun the earth made between any two recognised and well-marked events in its geological history. Nevertheless it is possible, and eminently convenient, to break up geological time into great periods: it must not be supposed, however, that such periods are necessarily equal in chronological, organic, or lithological value; or separated from one another by broadly marked lines of demarcation; or that either their commencements or terminations in different and widely separated districts were strictly synchronous.One of the terms in the chronological series of the geologist is known as the Devonian, that which preceeded it the Silurian, and the succeeding one the Carboniferous period; and these, with some others of less importance, belong to the Palæozoic or ancient-life epoch, or group of periods.

Tracing the Earth: Narratives of Personal and Geological History in Charlotte Smith's Beachy Head

Romanticism ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 22-31
Author(s):  
Alexandra Paterson
Keyword(s):  
Personal History ◽  
Geological History ◽  
Charlotte Smith ◽  
The Earth ◽  
History Of

This essay explores how Charlotte Smith transports lines and themes from her Elegiac Sonnets (1784–1800) to transform her narrative of personal history in her final poem, Beachy Head (1807). While her personal history is inextricably connected to her relationship with the land in both works, Beachy Head offers a version of her history that is embedded in a much wider context of the geological history of the landscape. This prompts a reflection on the telling and reading of histories that complicates and recasts Smith's representation of both herself and the land, as she recognizes both to be dynamic.

scholarly journals The early evolution of the earth, the beginning of its geological history: how and when the granitoid magmas appeared

LITOSFERA ◽  
2018 ◽  
pp. 653-671 ◽  
Author(s):  
Mikhail I. Kuzmin ◽  
Vladimir V. Yarmolyuk ◽  
Alexander B. Kotov
Keyword(s):  
Large Scale ◽  
Mantle Plumes ◽  
Geological History ◽  
Leading Role ◽  
The Earth ◽  
Geological Situation ◽  
History Of ◽  
Archean Crust ◽  
Primary Substance ◽  
Basaltic Crust

The Earth has a number of differences from the planets of the Solar System and other star-planetary systems. These differences were acquired during its formation and geological history. In the early Chaotic eon occurred the accretion of the Earth, the separation of the primary substance of the Earth into a mantle and a nucleus, a satellite of the Earth - the Moon appeared. 4500 Ma ago in the Gadey aeon the geological history of the Earth began. At this time, the endogenous processes on the Earth were controlled to a great extent by meteorite-asteroid bombardments, which caused large-scale melting and differentiation of the upper shells of the Earth. In the magmatic chambers differentiation proceeded until the appearance of melts of granitoid composition. The continental crust of Gadey time was almost completely destroyed by meteoric bombardments, the last heavy bombardment occurred at the end of the Gadey aeon 4000-3900 Ma ago. The geological situation of the Gadey time can be judged only from the preserved zircons from the rocks of that epoch. In particular, their geochemical features indicate that the Earth has an atmosphere. The Gadey eon was replaced by the Archean one, from which the processes of self-organization began to predominate on the Earth. At this time, a crust composed of komatiite-basalt and tonalite-trondhjemite-granodiorite (TTG) series of rocks was formed. In its formation, the processes of sagduction (vertical growth of the crust) over the rising mantle plumes was played the leading role. At the same time the lower basaltic crust was bured in the mantle, eclogitized and melted, which led to the appearance of the sodium series of TTG rocks. At the end of the Archean 3.1-3.0 Ga tectonics of the cover (LID tectonics), which determined the style of the structure and development of the Archean crust, is replaced by the tectonics of small plates, which was later replaced by modern tectonics - the tectonics of plates combined with mantle plumes.

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