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dessai ashoka g. - the lithosphere beneath the indian shield

The Lithosphere Beneath the Indian Shield A Geodynamic Perspective




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Dettagli

Genere:Libro
Lingua: Inglese
Editore:

Springer

Pubblicazione: 09/2020
Edizione: 1st ed. 2021





Trama

This book explores the geotectonic evolution of the lithosphere beneath the Indian Shield, which comprises a collage of cratons variously bounded by mobile belts and palaeo-rifts. The lithosphere beneath these is fairly thin compared to other cratons worldwide, petrologically varied and shows considerable variation in thickness with depth both intra-craton and among cratons. Moreover, it has been subjected to the influence of repeated magmatic episodes from Proterozoic to Palaeocene, which have variously impacted different parts of the shield. The thermotectonic influence on constituent cratons is variable depending on the evolutionary history. This book discusses the impact of successive tectonomagmatic events on the evolution of the deep crust and shallow mantle, and their Phanerozoic modification as gleaned through the xenolith window.

The book provides a petrotectonic perspective on the deep crust and shallow mantle from direct samples brought up as xenoliths of deep lithologies, and offers a comprehensive overview for students, researchers, academics and professionals, integrating the results of petrological studies of deep lithologies and geophysical investigations to (i) shed light on the physico-chemical and thermal structure of the lithosphere from an array of geotectonic settings and (ii) gain insights into the spatio-temporal  evolution of the Indian Shield. 

An in-depth guide critical thinking on the complex issue of mantle differentiation, magmatism, lithosphere modification and crustal growth over time, the book allows readers to gain a better understanding of the processes that affect the lithosphere and shape the crust on which we live.





Sommario

Chapter 1:  Continental lithosphere
Introduction
Studies in India
Methods and Techniques
Seismic Surveys
Electromagnetic and Magnetotelluric Techniques
Xenolith Studies
Relevance of Xenolith Studies
Limitations of Xenolith Studies
Thermal Structure of the Crust
Thermobarometry
Limitations
Heat Flow Studies
Heat Generation
 Mechanism of Heat Transfer
Heat Flow Measurements
Constraints
Reduced Heat Flow
Magnetic Studies
Curie Point Isotherm
Gravity Methods
Primary Geochemical Differentiation
Bimodality of the Crust
Continental Crust
Seismic Structure 
Types of Continental Crust
Shield
Craton
Platform
Oceanic Crust 
The Deep Crust
Inferences from Receiver Function Studies
Earth’s Mantle
Mantle Composition
Lithospheric Mantle: Seismic Structure
Petrologic Lithosphere 
Thermal Lithosphere

Chapter 2: Indian Shield
Introduction
Geotectonic Framework
Geology of  Peninsular Block
Aravalli Craton
Bundelkhand Craton
Singhbhum Craton
Bastar Craton
Dharwar Craton
Western Dharwar Craton
Eastern Dharwar Craton
Granulite Terrain
Chotanagpur Gneiss-Granulite Terrain   
Eastern Ghat Mobile Belt
Southern Granulite Terrain
Granulite Types in South India
Igneous vs Metasomatic Origin
Nilgiri Domain
Madurai Domain
Offshore Region: Western Margin
Eastern Margin Offshore
Geophysical Studies in South India
Crustal Structure from Magsat and Gravity Data
Seismic Structure of WDC
Structure of the Crust beneath EDC
Crust beneath Southern Granulite Terrain
Comparative Assessment of Indian Shield with Other Shields
Xenolith Host Rocks
CITZ Dyke Swarm
Western Continental Margin Dyke Swarm
Duration of Deccan Magmatism

Chapter 3: Petrology
Introduction
Xenolith Occurrences in India
       Radiometric Ages of  Host Rocks
Petrology of  Xenoliths
       Xenoliths from Deccan Traps (WDC)
                Mantle Xenolith: Lherzolites
                Crustal Xenoliths: Granulites
                Mineral Chemistry
                Xenoliths from Kutch (Aravalli Craton)
       Xenoliths in Kimberlites 
                Xenoliths from Bundelkhand Craton
                Lherzolite Xenoliths from EDC
                Eclogite Xenoliths from EDC
                Xenolith from Bastar Craton
                Dyke Boudins from Pericratonic Terrain

Chapter 4: Lithosphere structure
Introduction
Crustal Structure: Gravity and Seismic Studies
Bundelkhand Region North of CITZ
Northern Region of WDC
Central Region of WDC
Structure from S wave velocity Function
Eastern Region beneath EDC
Pericratonic Domain: Southern Granulite Terrain
Offshore Crust of Arabian Sea
Laxmi Ridge Section
Chagos-Maldive Ridge Section
Offshore Crust of Bay of Bengal
Nature of Sub-continental Moho
Characteristics of Shallow Mantle
Nature of Crust-Mantle Boundary
Seismic Interpretation

Chapter 5: Geothermal structure
Introduction
Thermal Structure of the Shield
Bundelkhand and WDC: Thermal structure
Thermal Regime of the EDC and Bastar Cratons
Southern Granulite Terrain: Thermal Characteristics
Xenolith vis-a-vis Heat Flow Geotherms
Comparison with Cratons Globally
Inferences from Geotherms in Other Cratons
Estimates of Thermal Boundary Layer
Thermal Evolution of South Indian Cratons
Thermal Peculiarities of the WDC 
Thermal Characteristice of EDC
Temporal Variation in Thermal Structure
Surface Heat Flow of the South Indian Shield
Heat Flow Variation among South Indian Cratons
Global Heat Flow Observations
Heat Flow along Craton Margins
Influence of Composition on Heat Generation
Thermal Equilibration over Time
Contribution to Heat Flow: Xenolith Guestimates
Inferences from Other Parts of the World
Thermal Perturbation: An Effect of Crustal Thickening
Causes of Excess Heat and Estimation of Crustal Accretion
Overall Heat Production of the Crust

Chapter 6: Integration of insights

Introduction
Crustal Structure Parameters  
Western Dharwar Craton: A Synthesis
Eastern Dharwar Craton 
Pericratonic Belt and Offshore Crust
Nature of Sub-continental Moho
Thermal Perspective: Indian Shield
Western Dharwar and Bundelkhand Cratons
Eastern Dharwar Craton and Pericratonic Region
Tectonomagmatic Accretions
Western Dharwar Craton
Composition of the Lower Crust: Xenolith Assessment
Inferences from Geophysical Estimates
Lower Crust of Eastern Dharwar Craton
Lower Crust of Pericratonic Terrain
Origin of the Lower Crustal Granulites
Exhumation of SGT
Evolution of  Lower Crust
Formation of  Felsic Crust: Recycling Mechanism
Nature and Composition of  the Lithospheric Mantle
Archaean vs Proterozoic Mantle
SCLM beneath Western India
SCLM beneath EDC
Metasomatic Modification of the Lithospheric Mantle   
Thickness of SCLM and its Evolution
Contribution of Continental Margin to Lithospheric Growth 
Offshore Evidences of de-roofing of Continental Lithosphere
       Crustal Growth Processes: A Synoptic Overview
Nature of Pristine Crust
Secular Changes in Crustal Composition
Generation of Primitive Crust
Greenstone Belts
Komatiites
Layered Complexes
Dyke Swarms
Anorthosite Complexes

Concluding Remarks

Selected bibliography





Autore

Prof. Dr. Ashoka Dessai has over 39 years of teaching and research experience at post-graduate level, initially at S. P. Pune University, and later at Goa University. He has conducted research in India and abroad, published over 50 research papers in peer-reviewed national and international journals and has been a reviewer for international journals published by Springer and other publishers. 

Prof. Dr. Dessai has authored two books: (i) Geology and Mineral Resources of Goa, New Delhi Publishers, and (ii) Goa: Geology, Industry and Environment (in press), Publisher: Directorate of Art and Culture, Govt. of Goa. He has also delivered lectures at several universities and professional organisations and research institutes in India and abroad. 

He has worked in wide variety of terrains, such as ophiolites of Ladakh Himalaya, Precambrian layered complexes and komatiitic ultramafites of South India, Deccan Traps of western India, including Precambrian iron and manganese ores, chromites, and laterites and bauxites. He has participated in an Indian Ocean expedition for prospecting of polymetallic nodules. 

Prof. Dr. Dessai has served as the Dean of the Faculty of Pure Sciences and Registrar of Goa University.












Altre Informazioni

ISBN:

9783030529413

Condizione: Nuovo
Collana: Modern Approaches in Solid Earth Sciences
Dimensioni: 235 x 155 mm Ø 588 gr
Formato: Copertina rigida
Illustration Notes:XVIII, 259 p. 71 illus., 38 illus. in color.
Pagine Arabe: 259
Pagine Romane: xviii


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