Inverse methods for modeling non-rigid plate kinematics: Application to mesozoic plate reconstructions of the Central Atlantic

Published plate reconstructions commonly show significant differences in initial plate configuration and syn-extensional opening directions. The variability of published models is primarily due to the difficulty associated with restoring crustal stretching history. Here we present an inverse non-rigid kinematic method that inverts plate motion and present day crustal thickness to approximate the history of bulk lateral strain and crustal thinning associated with lithospheric stretching. The kinematic link between plate motion and bulk crustal thickness that is used with this method is based on insights obtained from geodynamic models. We implement this approach in open source kinematic modeling software and apply it to test new Early Mesozoic plate kinematic models of the Central Atlantic. This application shows that the patterns of stretching inferred from the syn-rift basins of the Newark Supergroup can be explained if (1) syn-rift Euler pole flow lines were parallel to the Grand Banks transform margin and (2) initial formation of the East Coast Margin Igneous Province was coincident with the formation of the Central Atlantic Magmatic Province. These syn-rift to breakup models of the Central Atlantic lead to better constrained models of early seafloor spreading that show full spreading velocities in the ultraslow regime and within the transition from ultraslow to slow spreading regimes.

[1]  G. Wissmann.  Stratigraphy and Structural Features of the Continental Margin Basin of Senegal and Mauritania , 1982 .

[2]  J. Wiedmann,et al.  Mesozoic-Cenozoic Development of the Eastern North American and Northwest African Continental Margins: A Comparison , 1982 .

[3]  D. Hutchinson,et al.  Seismic structure of the U.S. Mid‐Atlantic continental margin , 1994 .

[4]  W. Holbrook,et al.  Crustal structure across the Brunswick magnetic anomaly, offshore Georgia, from coincident ocean bottom and multi‐channel seismic data , 1994 .

[5]  R. Schlische,et al.  Diachronous Rifting, Drifting, and Inversion on the Passive Margin of Central Eastern North America: An Analog for Other Passive Margins , 1998 .

[6]  J. W. Patton,et al.  Early history of the Atlantic Ocean and gas hydrates on the Blake Outer Ridge: Results of the Deep Sea Drilling Project Leg 76 , 1982 .

[7]  P. Stoffa,et al.  Crustal structure of the Southeast Georgia embayment-Carolina trough: Preliminary results of a composite seismic image of a continental suture(?) and a volcanic passive margin , 1990 .

[8]  H. Roeser,et al.  Structural development of the Jurassic Magnetic Quiet Zone off Morocco and identification of Middle Jurassic magnetic lineations , 2002 .

[9]  J. Olivet,et al.  Un nouveau point de départ pour l'histoire de l'Atlantique central , 2004 .

[10]  H. Schouten,et al.  Plate kinematics of the central Atlantic , 1986 .

[11]  J. E. Everett,et al.  The fit of the continents around the Atlantic , 1965, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[12]  W. Roest,et al.  An alternative early opening scenario for the Central Atlantic Ocean , 2009 .

[13]  J. Olivet,et al.  Crustal structure of the SW Moroccan margin from wide-angle and reflection seismic data (the Dakhla experiment). Part B — The tectonic heritage , 2009 .

[14]  M. Rabineau,et al.  A New Starting Point for the History of the Central Atlantic , 2004 .

[15]  W. Holbrook,et al.  U.S. mid-Atlantic margin structure and early thermal evolution , 1997 .

[16]  M. Fnais,et al.  The crustal and upper mantle shear velocity structure of Eastern North America from the joint inversion of receiver function and surface-wave dispersion , 2005 .

[17]  P. Stoffa,et al.  Deep structure of the U.S. Atlantic continental margin, offshore South Carolina, from coincident ocean bottom and multichannel seismic data , 1994 .

[18]  D. Hutchinson,et al.  U.S. Atlantic continental margin; Structural and tectonic framework , 1988 .

[19]  H. Jackson,et al.  Admittance signatures of rifted and transform margins: examples from eastern Canada , 1991 .

[20]  W. Roest,et al.  Crustal anatomy of a transform continental margin , 1990 .

[21]  L. Brown,et al.  Early Mesozoic Basin Structure and Tectonics of the Southeastern United States as Revealed from Cocorp Reflection Data and the Relation to Atlantic Rifting , 1987 .

[22]  M. Gutscher,et al.  The crustal structure of the NW Moroccan continental margin from wide-angle and reflection seismic data , 2002 .

[23]  P. Olsen.  STRATIGRAPHIC RECORD OF THE EARLY MESOZOIC BREAKUP OF PANGEA IN THE LAURASIA-GONDWANA RIFT SYSTEM , 1997 .

[24]  D. McKenzie,et al.  Some remarks on the development of sedimentary basins , 1978 .

[25]  W. B. Harland,et al.  A Geologic time scale , 1982 .

[26]  C. Keen,et al.  Formation and evolution of the Nova Scotian rifted margin: Evidence from deep seismic reflection data , 1995 .

[27]  C. Beaumont,et al.  Roles of lithospheric strain softening and heterogeneity in determining the geometry of rifts and continental margins , 2007 .

[28]  Michel Anders.  Blender 2.49 Scripting , 2010 .

[29]  C. Keen,et al.  The transition from a volcanic to a nonvolcanic rifted margin off eastern Canada , 1995 .

[30]  L. Lavier,et al.  Observations from the Alpine Tethys and Iberia–Newfoundland margins pertinent to the interpretation of continental breakup , 2007 .

[31]  G. Lister,et al.  A re-evaluation of the breakup of South America and Africa using deformable mesh reconstruction software , 2007 .

[32]  Tullis C. Onstott,et al.  Constraints on the thermal history of Taylorsville Basin, Virginia, U.S.A., from fluid-inclusion and fission-track analyses: implications for subsurface geomicrobiology experiments , 1996 .

[33]  N. Driscoll,et al.  Tectonic significance of syn-rift sediment packages across the Gabon-Cabinda continental margin , 1997 .

[34]  P. Stoffa,et al.  Seaward-dipping reflectors offshore the southeastern United States: Seismic evidence for extensive volcanism accompanying sequential formation of the Carolina trough and Blake Plateau basin , 1995 .

[35]  Walter H. F. Smith,et al.  Marine gravity anomaly from Geosat and ERS 1 satellite altimetry , 1997 .

[36]  M. Wysession,et al.  Crust and upper mantle discontinuity structure beneath eastern North America , 2002 .

[37]  J. Dunbar,et al.  Patterns of continental extension along the conjugate margins of the central and North ATLANTIC Oceans and Labrador Sea , 1989 .

[38]  Amos Salvador,et al.  The Gulf of Mexico Basin , 1991 .

[39]  F. Klingelhoefer,et al.  Crustal structure of the SW-Moroccan margin from wide-angle and reflection seismic data (the DAKHLA experiment) Part A: Wide-angle seismic models , 2009 .

[40]  G. Stampfli,et al.  Mesozoic sequence of Fuerteventura (Canary Islands): Witness of Early Jurassic sea-floor spreading in the central Atlantic , 1998 .

[41]  Dhananjay Ravat,et al.  National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map , 2007 .

[42]  I. Davison.  Central Atlantic margin basins of North West Africa: Geology and hydrocarbon potential (Morocco to Guinea) , 2005 .

[43]  C. Vérati,et al.  Chronology of the Central Atlantic Magmatic Province: Implications for the Central Atlantic rifting processes and the Triassic–Jurassic biotic crisis , 2007 .

[44]  A. Schettino,et al.  Breakup of Pangaea and plate kinematics of the central Atlantic and Atlas regions , 2009 .

[45]  James G. Ogg,et al.  A Geologic Time Scale 2004: CONCEPTS AND METHODS , 2004 .

[46]  Ramesh Desikan,et al.  Receiver function analysis of the North American crust and upper mantle , 2002 .

[47]  T. Funck,et al.  Crustal structure of the central Nova Scotia margin off Eastern Canada , 2006 .

[48]  J. Dunbar,et al.  Implications of continental crust extension for plate reconstruction: An example from the Gulf of Mexico , 1987 .

[49]  P. Kelemen,et al.  Origin of thick, high‐velocity igneous crust along the U.S. East Coast Margin , 1995 .

[50]  T. Funck,et al.  Crustal structure of the northern Nova Scotia rifted continental margin (eastern Canada) , 2004 .