Bengali Wikipedia 10th Anniversary Celebration Kolkata/Submissions/Unified Global Tectonics – An Expansion-based Geotectonics for Unfolding the Total Earth System

Submission no.

Title of the submission

Unified Global Tectonics – An Expansion-based Geotectonics for Unfolding the Total Earth System

Type of submission (discussion, hot seat, panel, presentation, tutorial, workshop)

Author of the submission

Subhasis Sen

E-mail address

ssennagpur82@yahoo.com

Username

Country of origin

India

Affiliation, if any (organisation, company etc.)

Retired Scientist from Council of Scientific and Industrial Research

Personal homepage or blog

Abstract (at least 300 words to describe your proposal)

In the present paper, supporting the earth expansion theory, the author has pointed out that the original small earth of pre-expansion stage was devoid of oceans, and, hence, the ocean-forming water at that stage must have been associated with the mantle, thereby imparting considerable fluid characteristic to that medium. It can, therefore, be conceived that the mantle material during the pre-expansion stage of the planet was considerably fluid and predominantly suitable for manifestation of all-encompassing expansion of the planet and drifting of the continents, possibly caused in response to gravitational pull of an extra-terrestrial planetary body. It was due to the earth’s expansion, the original semi-fluid mantle was swelled up concurrently causing fragmentation of the sialic continental crust and formation of several sinuous expansion cracks through which eruption of molten magma accompanied by widespread emission of volatiles - chiefly composed of water took place. With continued expansion the broken continental fragments were gradually drifted away from each other giving rise to distinct continents while the newly opened space between the adjacent continental fragments were filled up with molten basaltic magma to form ocean basins. With further advancement of the process of expansion, the expansion cracks were turned into mid-oceanic ridges while the ocean basins were continuousely enlarged and filled up with water - the main constituent of the degassed volatiles. It was due to the depletion of volatiles, the original semi-fluid mantle gradually turned into a solid and rigid body – as it stands now - when further expansion of the planet was stopped. Based mainly on analysis of seismic waves and examination of meteorites - which are considered as broken fragments of a pre-existing planetary body – it has been established that the planet earth - from its crust to core - can be divided into three distinct geospheres. Amongst these geospheres, the topmost one that occurs below the solid sialic crust is the solid mantle which is of basaltic composition and followed downward by a fluid zone of outer core, considered to be composed of iron in fluid codition. The inner-most zone or inner core of the planet forms a solid and rigid geosphere composed mainly of solid iron and nickel that occurs below the enigmatic outer core. In the prevalent concept cause of magnetic characteristic of the planet has been attributed to mantle convection, despite presence of the solid iron core from which magnetic lines of force emanate. The prevalent interpretation based on the phenomenon of increase of temperature and pressure with depth – observed only on the upper part of the planet – supports the view that the solid iron core – representing the deepest part of the planet - is a zone of very high temperature and pressure and, hence, can not be the source of terrestrial magnetism. The author differs with the prevalent view because of solid and rigid nature of the mantle which would resist operation of convection current in that geosphere that could run a geo-dynamo to generate terrestrial magnetism.

In the present study, based on evidences of seismic studies and iron meteorites that exhibit magnetic proprerties, the inner core of the planet has been considered to be composed of a huge dipolar magnet which was originally firmly held in the interior of the planet. On the basis of matching thickness of outer core with the extent of expansion, it has further been deduced that the fluid geosphere was opened up due to planetary expansion. The earth expansion theory, as modified by the author, further envisages that before expansion, in the small earth, the solid iron core and original fluid mantle were juxtaposed to each other. Earth’s expansion was initiated with rupture of the original core-mantle conjunction, along which with continued expansion a void zone or a pseudo-fluid geosphere was gradually opened up, apparently caused by gravitational pull from an external planetary object. The two discrete geospheres of core and mantle, separated by a virtually void zone, would exert gravitational pull on each other, thereby, generating an additional reversely directed gravitational pull in the interior of the earth. Consequently, in the deep interior of the planet a low pressure low temperature zone - suitable for sustaining magnetic characteristic of iron - around the inner core would be formed. With the opening up of the so called fluid outer core, considered in the present study as a virtually void or pseudo fluid zone, the magnetic inner core continued to remain within it in a suspended condition when completely new magnetic phenomena like reversal of magnetic poles, polar wandering etc took place in response to extra-terrestrial magnetic influence .

Track

Language of Track

English

Length of session (if other than 30 minutes, specify how long)

30 minutes

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