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Effect of the lithospheric thermal state on the Moho interface: a case study in South America
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, Samhällsbyggnad, GIS. KTH Royal Institute of Technology, Stockholm, Sweden. (Geospatial information science)
School of Geosciences, China University of Petroleum (East China), Qingdao, China.
KTH Royal Institute of Technology, Stockholm, Sweden. (Geodesy KTH)
NTIS - New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia, Plzeň, Czechia.
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2017 (Engelska)Ingår i: Journal of South American Earth Sciences, ISSN 0895-9811, E-ISSN 1873-0647, Vol. 76, s. 198-207Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Gravimetric methods applied for Moho recovery in areas with sparse and irregular distribution of seismic data often assume only a constant crustal density. Results of latest studies, however, indicate that corrections for crustal density heterogeneities could improve the gravimetric result, especially in regions with a complex geologic/tectonic structure. Moreover, the isostatic mass balance reflects also the density structure within the lithosphere. The gravimetric methods should therefore incorporate an additional correction for the lithospheric mantle as well as deeper mantle density heterogeneities. Following this principle, we solve the Vening Meinesz-Moritz (VMM) inverse problem of isostasy constrained by seismic data to determine the Moho depth of the South American tectonic plate including surrounding oceans, while taking into consideration the crustal and mantle density heterogeneities. Our numerical result confirms that contribution of sediments significantly modifies the estimation of the Moho geometry especially along the continental margins with large sediment deposits. To account for the mantle density heterogeneities we develop and apply a method in order to correct the Moho geometry for the contribution of the lithospheric thermal state (i.e., the lithospheric thermal-pressure correction). In addition, the misfit between the isostatic and seismic Moho models, attributed mainly to deep mantle density heterogeneities and other geophysical phenomena, is corrected for by applying the non-isostatic correction. The results reveal that the application of the lithospheric thermal-pressure correction improves the RMS fit of the VMM gravimetric Moho solution to the CRUST1.0 (improves ∼ 1.9 km) and GEMMA (∼1.1 km) models and the point-wise seismic data (∼0.7 km) in South America.

Ort, förlag, år, upplaga, sidor
2017. Vol. 76, s. 198-207
Nyckelord [en]
Crust, Gravity, Lithosphere, Moho, Thermal state
Nationell ämneskategori
Geofysik Multidisciplinär geovetenskap Annan geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:hig:diva-23685DOI: 10.1016/j.jsames.2017.02.010ISI: 000402342800014Scopus ID: 2-s2.0-85015736007OAI: oai:DiVA.org:hig-23685DiVA, id: diva2:1077181
Forskningsfinansiär
Rymdstyrelsen, 116/12
Anmärkning

Funding agencies:

NNSF of China  Grant no: 41506055 

Research Board at University of Gavle  Grant no: HIG-STYR 2015/32 

Tillgänglig från: 2017-02-26 Skapad: 2017-02-26 Senast uppdaterad: 2018-03-13Bibliografiskt granskad

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Bagherbandi, Mohammad

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Journal of South American Earth Sciences
GeofysikMultidisciplinär geovetenskapAnnan geovetenskap och miljövetenskap

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