Carbon depth cycle and formation of abiogenic hydrocarbons

The relevance. Identification of mechanisms of carbon metamorphic transformation in convergent and divergent regions of the Earth, assessment of the scale of deep transport and the transfer on the generation of abiogenic hydrocarbons in tectonic discharge zones are some of the most urgent problems o...

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Main Authors: Nickolay O. Sorokhtin, Leopold I. Lobkovsky, Igor Petrovich Semiletov
Format: Article
Language:Russian
Published: Tomsk Polytechnic University 2018-08-01
Series:Известия Томского политехнического университета: Инжиниринг георесурсов
Subjects:
Online Access:http://izvestiya.tpu.ru/archive/article/view/2083
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author Nickolay O. Sorokhtin
Leopold I. Lobkovsky
Igor Petrovich Semiletov
author_facet Nickolay O. Sorokhtin
Leopold I. Lobkovsky
Igor Petrovich Semiletov
author_sort Nickolay O. Sorokhtin
collection DOAJ
description The relevance. Identification of mechanisms of carbon metamorphic transformation in convergent and divergent regions of the Earth, assessment of the scale of deep transport and the transfer on the generation of abiogenic hydrocarbons in tectonic discharge zones are some of the most urgent problems of modern geology. The aim of the research is to describe multi-stage and polycyclic carbon transformation and transfer in the crust and mantle. Sedimentary rocks covered in subductions zones are destroyed and transformed by metamorphic processes. Some of the newly formed carbon compounds are transferred by convective flows of the mantle to the rift zones of mid-ocean ridges, brought to the surface, decomposed in the presence of water and form a wide range of hydrocarbons and carbon dioxide. There, they are again deposited on the sea floor in the form of sediments forming carbonate and carbon/containing structural/material complexes. Result. It is determined that the manifestation of a multi-stage mechanism of physicochemical transformations in crust-mantle areas of the Earth leads to occurrence of features of abiogenic origin in biogenic hydrocarbons. The identified crust-mantle carbon cycle is a part of a global process of carbon cyclic transport from the atmosphere into the mantle and back. The scale of its manifestation, most likely, is not so large. Numerous small (mm and fractions of mm) particles of exogenous matter and dispersed carbon pulled in plate subduction zones form a stable geochemical train of the crustal trend in the mantle spreading along the surface of convection flows motion. It is possible to judge indirectly the scale of this process manifestation by degassing amount of hydrocarbon and carbon dioxide gases and hydrogen in Earth's crust rift systems. In this case the amount of generated depth/origin hydrocarbon gases cannot form large gas and oil and gas fields as their significant part is released in the atmosphere. Only a small amount of compounds may be deposited in oceanic sediments and form gas hydrate accumulations in them.
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spelling doaj.art-81227143e8b84d0aa207d851cfac86822023-06-02T21:10:07ZrusTomsk Polytechnic UniversityИзвестия Томского политехнического университета: Инжиниринг георесурсов2500-10192413-18302018-08-013298Carbon depth cycle and formation of abiogenic hydrocarbonsNickolay O. SorokhtinLeopold I. LobkovskyIgor Petrovich SemiletovThe relevance. Identification of mechanisms of carbon metamorphic transformation in convergent and divergent regions of the Earth, assessment of the scale of deep transport and the transfer on the generation of abiogenic hydrocarbons in tectonic discharge zones are some of the most urgent problems of modern geology. The aim of the research is to describe multi-stage and polycyclic carbon transformation and transfer in the crust and mantle. Sedimentary rocks covered in subductions zones are destroyed and transformed by metamorphic processes. Some of the newly formed carbon compounds are transferred by convective flows of the mantle to the rift zones of mid-ocean ridges, brought to the surface, decomposed in the presence of water and form a wide range of hydrocarbons and carbon dioxide. There, they are again deposited on the sea floor in the form of sediments forming carbonate and carbon/containing structural/material complexes. Result. It is determined that the manifestation of a multi-stage mechanism of physicochemical transformations in crust-mantle areas of the Earth leads to occurrence of features of abiogenic origin in biogenic hydrocarbons. The identified crust-mantle carbon cycle is a part of a global process of carbon cyclic transport from the atmosphere into the mantle and back. The scale of its manifestation, most likely, is not so large. Numerous small (mm and fractions of mm) particles of exogenous matter and dispersed carbon pulled in plate subduction zones form a stable geochemical train of the crustal trend in the mantle spreading along the surface of convection flows motion. It is possible to judge indirectly the scale of this process manifestation by degassing amount of hydrocarbon and carbon dioxide gases and hydrogen in Earth's crust rift systems. In this case the amount of generated depth/origin hydrocarbon gases cannot form large gas and oil and gas fields as their significant part is released in the atmosphere. Only a small amount of compounds may be deposited in oceanic sediments and form gas hydrate accumulations in them.http://izvestiya.tpu.ru/archive/article/view/2083carbon cyclesubduction zonesrift zonesabiogenic hydrocarbonscrust-mantle transportcarbon geochemistry
spellingShingle Nickolay O. Sorokhtin
Leopold I. Lobkovsky
Igor Petrovich Semiletov
Carbon depth cycle and formation of abiogenic hydrocarbons
Известия Томского политехнического университета: Инжиниринг георесурсов
carbon cycle
subduction zones
rift zones
abiogenic hydrocarbons
crust-mantle transport
carbon geochemistry
title Carbon depth cycle and formation of abiogenic hydrocarbons
title_full Carbon depth cycle and formation of abiogenic hydrocarbons
title_fullStr Carbon depth cycle and formation of abiogenic hydrocarbons
title_full_unstemmed Carbon depth cycle and formation of abiogenic hydrocarbons
title_short Carbon depth cycle and formation of abiogenic hydrocarbons
title_sort carbon depth cycle and formation of abiogenic hydrocarbons
topic carbon cycle
subduction zones
rift zones
abiogenic hydrocarbons
crust-mantle transport
carbon geochemistry
url http://izvestiya.tpu.ru/archive/article/view/2083
work_keys_str_mv AT nickolayosorokhtin carbondepthcycleandformationofabiogenichydrocarbons
AT leopoldilobkovsky carbondepthcycleandformationofabiogenichydrocarbons
AT igorpetrovichsemiletov carbondepthcycleandformationofabiogenichydrocarbons