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

SYSNO ASEP	0379702
Document Type	A - Abstract
R&D Document Type	The record was not marked in the RIV
R&D Document Type	Není vybrán druh dokumentu
Title	Contrasting Nature of Magnetic Anomalies over Thin Sections Made out of Barrandien’s Basaltic Rocks Points to their Origin
Author(s)	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}
Source Title	Contributions to Geophysics & Geodesy - ISSN 1335-2806 -, special issue (2012), s. 69-70
Number of pages	2 s.
Publication form	WWW - WWW
Action	Castle meeting New Trends in Geomagnetism : Paleo, rock and environmental magnetism/13./
Event date	17.06.2012-23.06.2012
VEvent location	Zvolen
Country	SK - Slovakia
Event type	WRD
Language	eng - English
Country	SK - Slovakia
Keywords	magnetic anomalies ; thin sections ; volcanic rocks
Subject RIV	DE - Earth Magnetism, Geodesy, Geography
R&D Projects	GAP210/10/2351 GA ČR - Czech Science Foundation (CSF)
Institutional support	GLU-S - RVO:67985831
Annotation	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.
Workplace	Institute of Geology
Contact	Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
Year of Publishing	2013

Number of the records: 1