+ Translate

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.

(PDF same-day service: $19.90)

Order PDF Full Text


Not the article you are looking for?
Click here to order the paper you need

Accession: 037196145

PDF Full Text: Submit

Submit PDF Full Text

No spam - Every submission is manually reviewed

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Moreno, K.; Bracarense, A. P. F. R. L., 2006: Canine lymphoma: a review. Lymphoma is the most common haemolymphatic malignancy of dogs. Some breeds are reported to have increased relative risks of developing the disease, which is aggressive, of spontaneous onset and has unknown aetiology. Different criteria are used to...

Roy, Arijit; Volgin, Denys V.; Baby, Santhosh Mukadiyil; Kubin, Leszek; Lahiri, Sukhamay, 2002: Activation of HIF-1alpha mRNA by hypoxia in isolated rat carotid body. Carotid body (CB) is a major oxygen-sensing peripheral organ that enables animals to sense hypoxia and regulate ventilation. The sensitivity of the CB to acute changes in blood oxygen level is altered by exposure to oxygen levels outside the norma...

Laurent, Francois; Canlet, Cecile; Debrauwer, Laurent; Pascal-Lorber, Sophie, 2007: Metabolic fate of -2,4-dichlorophenol in tobacco cell suspension cultures. In plant tissues, xenobiotics often are conjugated with natural constituents such as sugars, amino acids, glutathione, and malonic acid. Usually, conjugation processes result in a decrease in the reactivity and toxicity of xenobiotics by increasi...

Renner, J. E.; Gallo, G. G.; Montesinos Ramos, I. G.; Baschar, H. O., 1991: Contact photodermatitis and keratitis in horses due to parsnip (Pastinaca sativa). Two separate cases, in November and February, are described in light-coloured horses allowed access to growing parsnips. There was no evidence that the horses had ingested the plants. A dark-coloured horse was unaffected. The lesions were produced...

Tomita, Taisuke; Watabiki, Tomonari; Takikawa, Rie; Morohashi, Yuichi; Takasugi, Nobumasa; Kopan, Raphael; De Strooper, Bart; Iwatsubo, Takeshi, 2001: The first proline of PALP motif at the C terminus of presenilins is obligatory for stabilization, complex formation, and gamma-secretase activities of presenilins. Mutations in presenilin (PS) genes cause early-onset familial Alzheimer's disease by increasing production of the amyloidogenic form of amyloid beta peptides ending at residue 42 (Abeta42). PS is an evolutionarily conserved multipass transmem...

Kosmatyi, Es; Bublik, Li, 1974: Use of the chromato-polarographic method for analysis of pesticides. Ukrainskii khimicheskii zhurnal: 40 (12) 1316-1318

Carini, G., 1936: Sul cosi detto fenomeno dell' eliminazione dei globuli polari nei gametociti dei parassiti malarigeni. Rivista di Malariologia Rome 1: 15: 88-98

Takeda, Masayuki; Hatano, Akihiko; Kurumada, Shigenori; Takahashi, Hitoshi; Wakatsuki, Syun Ji; Go, Hideto; Watanabe, Ryusuke; Tomita, Yoshihiko; Takahashi, Kota, 1999: Bladder neck suspension using percutaneous bladder neck stabilization to the pubic bone with a bone-anchor suture fixation system: A new extraperitoneal laparoscopic approach. A 39-year-old woman with type 1 genuine stress urinary incontinence was treated using a novel extraperitoneal laparoscopic bladder neck suspension procedure with a bone-anchor suture fixation system. Operative time and blood loss were 2.5 and 50 g...

Rao, D. M.; Reddy, T. P., 1996: Qualitative and quantitative analysis of peroxidases in induced mutants of pigeonpea (Cajanus cajan L.). The isoenzyme patterns and specific activities of peroxidases in 10-d-old seedlings of 3 C. cajan varieties (T21, ICP7409 and ICP2836) and their induced morphological mutants were investigated. The isoenzyme profiles of the mutants varied consider...

Vullo, Romain; Neraudeau, Didier, 2008: Cenomanian vertebrate assemblages from southwestern France; a new insight into the European Mid-Cretaceous continental fauna. Cenomanian paralic deposits of Charentes (southwestern France) have yielded abundant vertebrate microremains, including rather diversified continental taxa (e.g., frogs, turtles, crocodilians, dinosaurs, pterosaurs, lizards, and mammals). In this...