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Single-grain detrital-muscovite ages from Lower Cretaceous sandstones, Scotian basin, and their implications for provenance

2009; Canadian Society of Petroleum Geologists; Volume: 57; Issue: 1 Linguagem: Inglês

10.2113/gscpgbull.57.1.63

2368-0261

P. H. Reynolds, Georgia Pe‐Piper, David J. W. Piper, A. M. Grist,

Hydrocarbon exploration and reservoir analysis

Research Article| March 01, 2009 Single-grain detrital-muscovite ages from Lower Cretaceous sandstones, Scotian basin, and their implications for provenance Peter H. Reynolds; Peter H. Reynolds Department of Earth Sciences, Dalhousie University, Halifax, NS B3H 3J4, preynold@dal.ca Search for other works by this author on: GSW Google Scholar Georgia Pe-Piper; Georgia Pe-Piper Department of Geology Saint Mary's University Halifax, NS B3H 3C3 gpiper@smu.ca Search for other works by this author on: GSW Google Scholar David J.W. Piper; David J.W. Piper Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, NS B2Y 4A2, dpiper@nrcan.gc.ca Search for other works by this author on: GSW Google Scholar A.M. Grist A.M. Grist Department of Earth Sciences, Dalhousie University, Halifax, NS B3H 3J4, alexander.grist@bigpond.com 1Present address School of Physical Sciences, University of Queensland, Brisbane, Australia Search for other works by this author on: GSW Google Scholar Bulletin of Canadian Petroleum Geology (2009) 57 (1): 63–80. https://doi.org/10.2113/gscpgbull.57.1.63 Article history received: 02 Jun 2008 accepted: 19 Feb 2009 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Peter H. Reynolds, Georgia Pe-Piper, David J.W. Piper, A.M. Grist; Single-grain detrital-muscovite ages from Lower Cretaceous sandstones, Scotian basin, and their implications for provenance. Bulletin of Canadian Petroleum Geology 2009;; 57 (1): 63–80. doi: https://doi.org/10.2113/gscpgbull.57.1.63 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of Canadian Petroleum Geology Search Advanced Search Abstract Lower Cretaceous deltaic sandstones in the Scotian basin form important gas reservoirs. This study uses single-grain geochronology of detrital muscovite to better understand the sources and dispersal patterns of sediment in the Early Cretaceous. One hundred muscovite grains were dated from a transect of wells near Sable Island and a further 17 grains were dated from the Naskapi N-30 well in the western part of the basin. Excluding a few old grains, the muscovite ranges in age from ca. 420 to 240 Ma. The lack of ages <240 Ma for muscovite and for rare detrital monazite suggests that ages were not reset by post-depositional alteration. The age distribution of muscovite from the wells near Sable Island suggests that the principal sources were rocks that had experienced resetting during Alleghenian deformation and Late Triassic– earliest Jurassic rifting. The distribution of ages, together with mass balance calculations, suggest that these sources mainly were Meguma metasedimentary rocks, especially phyllites, on the inner Scotian Shelf, although shear zones on land and the inner shelf also may have contributed. The age distribution at Naskapi N-30 is similar to that in the South Mountain batholith, except for some grains younger than 360 Ma that suggest an offshore source with Alleghenian resetting. On the inner Scotian Shelf, Upper Cretaceous and Tertiary rocks onlap across Appalachian basement and the eroded edge of Jurassic and Lower Cretaceous rocks, providing further evidence that the inner shelf was an erosional area during the Early Cretaceous. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.