The interplay of regional structure and emplacement mechanisms at the contact of the South Mountain Batholith, Nova Scotia: floor-down or wall-up?
作者： Nicholas Culshaw , Pradeep Bhatnagar
DOI: 10.1139/E01-029
关键词: Geomorphology 、 Batholith 、 Lineation 、 Nova scotia 、 Shear (geology) 、 Bedding 、 Transect 、 Geochemistry 、 Geology 、 Syncline 、 Devonian
摘要: In southern Nova Scotia, the Devonian South Mountain Batholith was emplaced into metasedimentary rocks of Cambro-Ordovician Meguma Group at ca. 370 Ma. The contact eastern end transects a high angle trace subhorizontal, upright Acadian (mid-late Devonian) folds formed in Group. At two locations, where is well exposed, there are contrasting structures country adjacent to anticlinoria and synclinoria, respectively. Regional affected by ductile deformation abut batholith but undisturbed synclinoria. anticlinorial contacts, bedding youngs towards granite, granite side-down shear resulted belt which transposed new contact-parallel fabric. Deflection linear that were initially horizontal (e.g., intersection lineations) illustrates shear. reorientation ...
harvard.edu
nrcresearchpress.com 参考文章(24)
D.Barrie Clarke, Andrew S. Henry, Mary Anne White, Exploding xenoliths and the absence of ‘elephants’ graveyards’ in granite batholiths Journal of Structural Geology. ,vol. 20, pp. 1325- 1343 ,(1998) , 10.1016/S0191-8141(98)00082-0
Michael A. MacDonald, Richard J. Home, Michael C. Corey, Linda J. Ham, An overview of recent bedrock mapping and follow-up petrological studies of the South Mountain Batholith, southwestern Nova Scotia, Canada Atlantic Geology. ,vol. 28, pp. 7- 28 ,(1992) , 10.4138/1848
R. J. Home, M. A. MacDonald, M. C. Corey, L. J. Ham, Structure and emplacement of the South Mountain Batholith, southwestern Nova Scotia Atlantic Geology. ,vol. 28, pp. 29- 50 ,(1992) , 10.4138/1849
Roberta J Hicks, Rebecca A Jamieson, Peter H Reynolds, Detrital and metamorphic 40 Ar/ 39 Ar ages from muscovite and whole-rock samples, Meguma Supergroup, southern Nova Scotia Canadian Journal of Earth Sciences. ,vol. 36, pp. 23- 32 ,(1999) , 10.1139/E98-081
P REYNOLDS, G MUECKE, Age studies on slates: Applicability of the40Ar/39Ar stepwise outgassing method Earth and Planetary Science Letters. ,vol. 40, pp. 111- 118 ,(1978) , 10.1016/0012-821X(78)90080-8
C. K. Mawer, J. C. White, Sense of displacement on the Cobequid–Chedabucto fault system, Nova Scotia, Canada Canadian Journal of Earth Sciences. ,vol. 24, pp. 217- 223 ,(1987) , 10.1139/E87-024
Marcus C. Tate, D. Barrie Clarke, Petrogenesis and regional tectonic significance of Late Devonian mafic intrusions in the Meguma Zone, Nova Scotia Canadian Journal of Earth Sciences. ,vol. 32, pp. 1883- 1898 ,(1995) , 10.1139/E95-145
J. R. HENDERSON, T. O. WRIGHT, M. N. HENDERSON, A history of cleavage and folding: An example from the Goldenville Formation, Nova Scotia Geological Society of America Bulletin. ,vol. 97, pp. 1354- 1366 ,(1986) , 10.1130/0016-7606(1986)97<1354:AHOCAF>2.0.CO;2
Harold Williams, Robert D. Hatcher, Suspect terranes and accretionary history of the Appalachian orogen Geology. ,vol. 10, pp. 530- 536 ,(1982) , 10.1130/0091-7613(1982)10<530:STAAHO>2.0.CO;2
Keith Benn, Richard J. Horne, Daniel J. Kontak, Geoffrey S. Pignotta, Neil G. Evans, Syn-Acadian emplacement model for the South Mountain batholith, Meguma Terrane, Nova Scotia: Magnetic fabric and structural analyses Geological Society of America Bulletin. ,vol. 109, pp. 1279- 1293 ,(1997) , 10.1130/0016-7606(1997)109<1279:SAEMFT>2.3.CO;2