Počet záznamů: 1

Contrasting Nature of Magnetic Anomalies over Thin Sections Made out of Barrandien’s Basaltic Rocks Points to their Origin

SYSNO ASEP	0379702
Druh ASEP	A - Abstrakt
Zařazení RIV	Záznam nebyl označen do RIV
Zařazení RIV	Není vybrán druh dokumentu
Název	Contrasting Nature of Magnetic Anomalies over Thin Sections Made out of Barrandien’s Basaltic Rocks Points to their Origin
Tvůrce(i)	Kletetschka, Günther (GLU-S)_{RID, SAI, ORCID} Pruner, Petr (GLU-S)_{RID, SAI, ORCID} Schnabl, Petr (GLU-S)_{RID, SAI, ORCID} Šifnerová, Kristýna (GLU-S)_{RID, SAI}
Zdroj.dok.	Contributions to Geophysics & Geodesy - ISSN 1335-2806 -, special issue (2012), s. 69-70
Poč.str.	2 s.
Forma vydání	WWW - WWW
Akce	Castle meeting New Trends in Geomagnetism : Paleo, rock and environmental magnetism/13./
Datum konání	17.06.2012-23.06.2012
Místo konání	Zvolen
Země	SK - Slovensko
Typ akce	WRD
Jazyk dok.	eng - angličtina
Země vyd.	SK - Slovensko
Klíč. slova	magnetic anomalies ; thin sections ; volcanic rocks
Vědní obor RIV	DE - Zemský magnetismus, geodézie, geografie
CEP	GAP210/10/2351 GA ČR - Grantová agentura ČR
Institucionální podpora	GLU-S - RVO:67985831
Anotace	Magnetic anomalies were obtained over the thin sections of basaltic rocks of Silurian age sampled at various locations of the Prague Basin. Magnetic scans were acquired from volcano-sedimentary sequence (Telychian–Gorstian), namely at three localities; Cernidla (Wenlock), Listice roadcut (early Ludlow), and Listice quarry (latest Llandovery). The paleomagnetism of these rocks revealed two contrasting components of remanent magnetization in the same temperature or AF demagnetization ranges with different directions and paleolatitudes. Two preliminary results can be drawn: 1) Fitting the Silurian directions (D=178°, I=-37°) resulted of paleorotation of 160-175º and paleolatitudes 20–24° S; 2) The magnetization of Silurian volcanic rocks of the Prague Basin may represent Permian to Triassic overprint. The micro-magnetic anomaly distribution over the sampled surfaces revealed relationship with the origin of magnetic phases. Namely, magnetic scans suggested three magnetic characters: (1) Localized magnetic anomalies (2) Magnetic texture related to the formation of vesicles (3) Magnetic texture that relates to the massive basaltic matrix. Analysis of the constructed magnetic maps along with their paleomagnetic character, optical-reflected and transmitted microscopy revealed the primary sources of the paleomagnetic signal.
Pracoviště	Geologický ústav
Kontakt	Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
Rok sběru	2013

Počet záznamů: 1