1 Pol ish Geo log i cal In sti tute -Na tional Re search In sti tute, Rakowiecka 4, 00-975 Warszawa, Po land Narkiewicz, M., Petecki, Z., 2017. Base ment struc ture of the Pa leo zoic Plat form in Po land. Geo log i cal Quar terly, 61 (2): 502-520, doi: 10.7306/gq.XXXX The Pa leo zoic Plat form com prises the south west ern half of the Pol ish ter ri tory, sep a rated from the Pre cam brian East Eu ropean Plat form (EEP) by a NW-SE trending subvertical lithospheric-scale dis con ti nu ity -the Teisseyre-Tornquist Zone. In the pres ent study, the Pa leo zoic Plat form base ment is sub di vided based on geo log i cal and geo phys i cal ev i dence ac quired dur ing the last de cades, in clud ing deep seis mic re frac tion and re flec tion re sults, as well as grav ity, mag netic and magnetotelluric data. The units ad ja cent to the EEP, the Mid-Pol ish Do main (com pris ing the £ysogóry Block) and the Pom era nian Block, are char ac ter ized by a thinned three-layer EEP-type crys tal line crust (age 1.7-3.7 Gy). Their old est plat form cover is prob a bly com posed of thick Ediacaran syn-rift sed i men tary and vol ca nic rocks. Their west ern ex ten sion in the contig u ous Ger man and Bal tic area can be traced as far as the East Elbian Mas sif and Thor Su ture based mainly on mag netic anom aly pat terns. The Up per Silesian and Ma³opolska blocks lo cated in SE Po land are char ac ter ized by Cadomian (660-600 My) base ment over lain by the thick de formed Ediacaran foredeep de pos its. Whereas the units with the EEP-type base ment are in ter preted as prox i mal ter ranes dis placed along the EEP mar gin dur ing the late Early Pa leo zoic, the blocks with a Cadomian base ment are con ceived as ex otic ter ranes of a pos si ble Gondwanan prov e nance. All these ter ranes were accreted ul ti mately dur ing the fi nal, lat est Si lu rian stages of the Cal edo nian de for ma tion al though the ex act sce nario of the amal gam ation re mains hy po thet i cal. The Sudetic Do main in SW Po land is a col lage of dif fer ent crustal units jux ta posed ul timately in the Penn syl va nian (ca. 310 Ma) dur ing the fi nal ep i sodes of the Variscan Orog eny. Their north ern bound ary cor responds to the Rheic Su ture trace able in mag netic and grav ity anom a lies pat tern along the north ern mar gin of the Wolsztyn-Leszno High, and con tin u ing west wards along the Mid-Ger man Crys tal line High. The ar cu ate trace of the su ture in the NE is dextrally dis placed along the Odra Fault, and con tin ues south wards where it is mapped as the Moravian-Silesian Su ture.
A new mag netic anom aly map of Po land and its con tri bu tion to the rec og ni tion of crys talline base ment rocks. Geo log i cal Quar terly, 61 (4): 934-945, doi: 10.7306/gq.1383 Mag netic to tal field mea sure ments ac quired in Po land be tween 1974 and 2011 have been com piled in a new dig i tal da ta base that pro vides a com plete pic ture of mag netic anom a lies of the coun try. The data com pi la tion and fur ther pro cess ing pro cedures used to cre ate the mag netic anom aly da ta base and maps that ac com pany this ar ti cle are briefly sum ma rized. The reduced-to-the-pole and pseudogravity anom aly maps were com puted to ac cu rately lo cate anom a lies above their caus ative bod ies as well as to sim plify anom aly pat terns and em pha size prin ci pal mag netic do mains within the base ment. An in ter preta tion of the mag netic maps re veals a lot of mag netic base ment prov inces and do mains in di cat ing base ment di vi sion into blocks and struc tural el e ments, which are im por tant for un der stand ing the re gional tec tonic set ting of Po land.Key words: mag netom etry, Earth's to tal mag netic field map, pseudogravity, crys tal line base ment, Po land.
A new gravity model of the crustal structure of the Trans-European Suture Zone in the northwestern Poland has been constructed. The Bouguer anomaly map, obtained after stripping off the three-dimensional gravity effect of the sedimentary cover down to the Zechstein formations, is characterized by a 50 mGal gravity anomaly. We have assumed that the short-wavelength components derive from upper crustal intrusions and the long-wavelength components reflect crustal thickness and lateral heterogeneity which are strongly supported by the new seismic data along the LT-7 geotraverse. Quantitative modelling of gravity data along three profiles crossing the area indicate the presence of anomalous masses within the Lower Palaeozoic sequence, mainly along the Teisseyre-Tornquist Zone. Two of the profiles crossing the long-wavelength 'stripped' gravity high suggest the existence of a zone of 35 km crust above a dense upper mantle along the Teisseyre-Tornquist Zone. The extent of the zone can be determined based on the Bouguer anomalies interpretation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.