Ontological representation of rifts
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ONTOLOGICAL REPRESENTATION OF RIFTS. Arijit Mitra and A.K. Sinha Department of Geosciences Virginia Tech. RIFTS. Rifts are fault-bounded elongate troughs, under or near which the entire thickness of the lithosphere has been reduced by extension during their formation.

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ONTOLOGICAL REPRESENTATION OF RIFTS

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Ontological representation of rifts

ONTOLOGICAL REPRESENTATION OF RIFTS

Arijit Mitra and A.K. Sinha

Department of Geosciences

Virginia Tech


Rifts

RIFTS

  • Rifts are fault-bounded elongate troughs, under or near which the entire thickness of the lithosphere has been reduced by extension during their formation.

  • Rifts form in many tectonic settings such as above mantle plumes and at all stages of the Wilson Cycle.


Significance of rifts

Significance of Rifts

  • Rifting of continents involves two principal geological processes - tectonism and magmatism, which reflect the strain-rate and temperature dependent processes of deformation and adiabatic decompression melting within the earth.

  • Continental extension and break up are fundamental to understanding the origin of ocean basins and the mechanics of plate tectonics - all ocean basins form as a result of continental extension.


Significance of rifts1

Significance of Rifts

  • The fundamental geological processes that cause crustal extension - mantle convection, mantle plumes, opposing forces from slab pull and ridge push, and gravitational collapse.

  • Hence, the study of rifts will enable us to determine

    - the original local and regional states of stress

    - the spatial and temporal distribution and rate of strain

    - the pressures and temperatures

    - the physical and chemical properties of rocksandfluids involved

    - heterogeneity of the continental lithosphere prior to rifting

    - the pattern of mantle flow

    - the extent & style of melt generation & emplacement


Ontology for rifts

ONTOLOGY for RIFTS

Reference:

Sengor & Natal’in, 2001


Rift related rocks in the mid atlantic test bed

RIFT-RELATED ROCKS IN THE MID-ATLANTIC TEST BED

Two main phases of rifting (extension) in the Appalachians

Cryogenian Magmatic Province

760 Ma

failed rifting event

divergent plate boundary rift without previous doming (k22)

Catoctin Volcanic Province

570 Ma

rifting event that led to the formation of Iapetus ocean & break-up of Rodinia

divergent plate boundary rift without previous doming (k22)

Geological data from these two geological provinces are part of the VIRGINIA TECH IGNEOUS ROCK DATABASE


Global databases on extension related rocks

GLOBAL DATABASES ON EXTENSION RELATED ROCKS

  • GEOROC

  • NAVDAT

  • PETDB

  • PETROS

  • USGS DDS 14 Geochronology Database

  • EarthRef


Conclusion

Conclusion

  • Integration of the above-mentioned databases and web-based access through high performance computing is envisioned as part of the GEON cyberinfrastructure initiative.

  • An ontology driven integration is vital since ontologies are used as a computational pathway for answering queries.


Conclusion1

Conclusion

  • A spatial and temporal comparison of geological provinces improves ourunderstanding of geological processesand provides fundamental information onthe physical and chemical evolution of continents through time.

  • Rift environments represent continental-scale processes that involve extrusion of igneous rocks, evolution of sedimentary basins, extensional/compressive tectonism to metamorphism and leave a geophysical signature.

  • An ontological linking and integration of these multidisciplinary datasets will improve our understanding of complex dynamics of Earth systems.


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