EurekaMag.com logo
+ Site Statistics
30,357,975
Abstracts:
11,226,880
PDF Full Text:
1,380,829
+ Resolve Accession
+ Subscribe to Site Feeds

EurekaMag Most Shared ContentMost Shared

EurekaMag PDF Full Text ContentPDF Full Text

+ PDF Full Text

Request PDF Full TextRequest PDF Full Text

Submit PDF Full TextSubmit PDF Full Text

+ Follow Us

Follow on FacebookFollow on Facebook

Follow on TwitterFollow on Twitter

Follow on Google+Follow on Google+

Follow on LinkedInFollow on LinkedIn

Follow on TumblrFollow on Tumblr

+ Translate

翻译

Upper-crustal, basement-involved folding in the East Range of the Sudbury Basin, Ontario, inferred from paleomagnetic data and spatial analysis of mafic dykes


, : Upper-crustal, basement-involved folding in the East Range of the Sudbury Basin, Ontario, inferred from paleomagnetic data and spatial analysis of mafic dykes. Revue Canadienne des Sciences de la Terre 49.9

Tilting of crystalline basement rocks associated with folding strain at uppermost crustal levels is difficult to recognize if basement rocks are devoid of traceable marker planes. Here we use the spatial variation in strike of Paleoproterozoic mafic dyke segments complemented by compiled paleomagnetic data to identify tilting in Archean basement rocks associated with kilometre-scale folds of the eastern Sudbury Basin, Ontario. Spatial analysis of the strike of dyke segments is consistent with generation of the NE lobe and a newly identified anticline, referred to as the West Bay Anticline, in the layered Sudbury Igneous Complex (SIC). This anticline accounts better for the structural characteristics of the eastern Sudbury Basin than a previously proposed anticline with west-plunging hinge line. The West Bay Anticline is characterized by abrupt plan-view thickness variations in the lower SIC and curved faults displaying significant strike separations of SIC contacts. These structural characteristics are consistent with folding strain imparted to the SIC and adjacent Archean rocks during formation of the West Bay Anticline. Sublayer embayments and associated quartz diorite dykes likely served as zones of mechanical weaknesses, at which the higher-order folds localized. Unfolding magnitudes of the NE lobe based on primary paleomagnetic remanence directions are significantly smaller than inferred magnitudes that are based on the assumption that the basal SIC contact was initially planar. Thus, the basal SIC contact in the NE lobe likely had a trough-like geometry at the time of remanence acquisition. We advocate a scenario for the formation of the NE lobe, in which the trough geometry of the SIC is primary rather than a consequence of tilting prior to solidification of, and remanence acquisition in, the SIC. Finally, we caution the interpretation of photo lineaments in eroded basement terranes purely as a consequence of faulting.

Accession: 037196145

PDF Full Text: Submit



Submit PDF Full Text

No spam - Every submission is manually reviewed

Select a PDF file:

Close Close

Other references

Dinu C. N., 1985, Anuarul Institutului de Geologie si Geofizica = Annuaire de l'Institut de Geologie et de Geophysique 65: 5-142

Kozhokaru, Af; Ruziyeva, Rkh; Topaly, Vp; Topaly, Eye, 1979, Biophysics ub 1979) 23(4): 731-733

Borisov, I.; Kostov, I.; Koichev, K.; Bodurov, N.; Kolev, K.; Todorov, V., 1985: Erysipelothrix rhusiopathiae was injected intravenously into 6 lambs 1-2 months old. Polyarthritis developed during the subsequent 2 months. Changes in the ECG and rumen contractions were followed by radiotelemetry. X-ray examination revealed periosteitis and osteoarthritis of the carpal and tarsal joints.

Penner, H., 1970: The firmness of the exocarp, measured immediately after treatment, was decreased by exposing cherries at eating ripeness to ionizing radiation of from 100 to 1000 krad. On the other hand, storage at 10 or 20 deg C or soaking for 3 h in 0.1 or 1.0% CaCl2 solution increased exocarp firmness.

Vol'vac, P. V., 1970: A minimum air temperature below -23 degrees C. may be used to forecast the intensity of primary and secondary mildew infections of apples. By knowing the danger of frost in different regions the occurrence of the disease can be foreseen and the potential damage area defined. In regions where the probability of a minimum temperature below -24 deg...

Irene Roalkvam; Steffen Leth Jrgensen; Yifeng Chen; Runar Stokke; Hkon Dahle; William Peter Hocking; Anders Lanzn; Haflidi Haflidason; Ida Helene Steen, 2011: Methane seepages typically harbor communities of anaerobic methane oxidizers (ANME), however, knowledge about fine-scale vertical variation of ANME in response to geochemical gradients is limited. We investigated microbial communities in sediments below a white microbial mat in the G11 pockmark at Nyegga by 16S rRNA gene tag pyrosequencing and r...

Orzechowska, B.; Eckert, R., 2002: Pooled slaughter quality records of Large White and Landrace pigs were obtained from Pig Progeny Testing Stations in Poland. The animals were slaughtered at 86 kg (n=1332) or 100 kg (n=912) liveweight and their carcasses were evaluated. There was no relationship between liveweight at slaughter and percentage of basic cuts in the carcass. The per...

Orel, G.; Sprecchi, M., 1967, Bollettino di Zoologia, 34: 152

Bellotti E.; Di Carlo G.; Di Sabatino D.; Ferrari N.; Laubenstein M.; Pandola L.; Tomei C., 2007, Applied Radiation and Isotopes 65(7): 858-865

Barker, Dave.; Barker, Tracy., 1994, Vivarium (Lakeside): 62: 38-41