Alexander Peace

Alexander Peace
McMaster University | McMaster · School of Earth, Environment & Society

PhD, P.Geo

About

82
Publications
26,067
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608
Citations
Introduction
I am a structural geologist leading the McMaster Structural Geology and Tectonics Group (https://mcmaster-structural-tectonics.ca/), researching deformation processes and associated hazards as well as resources. I am always seeking new collaborations and opportunities with industry, academia and government so please get in touch!
Additional affiliations
July 2019 - present
McMaster University
Position
  • Professor (Assistant)
Description
  • Assistant Professor of Structural Geology in the School of Geography and Earth Sciences at McMaster University leading the Structural Geology and Tectonics research group. This group works on tectonic processes and geological structures at all scales.
September 2018 - April 2019
Memorial University of Newfoundland
Position
  • Instructor
Description
  • - Structural Geology (EASC-2401) – Jan 2019 - April 2019 - Advanced Marine Geology (EASC-4302) – Sept 2018 - Dec 2018
January 2017 - July 2019
Memorial University of Newfoundland
Position
  • PostDoc Position
Description
  • Working on the Orphan Basin offshore Newfoundland and the conjugate Irish margin. Also worked on. onshore rift-related magmatism.
Education
October 2012 - October 2016
Durham University
Field of study
  • Geology
October 2008 - June 2011
Durham University
Field of study
  • Geology

Publications

Publications (82)
Conference Paper
Full-text available
Canada's earthquake scenario catalogue is a nationwide collection of possible earthquake rupture scenarios that allows us to understand which populations and assets will be impacted by the rupture of particular faults (or their segments). In the past, scenarios were often generated on an ad hoc basis, when they were needed by practitioners. As new...
Article
Full-text available
The Sixtymile gold district, Yukon, Canada has been mined for placer gold since the late 19th century. However, increasing demand for gold has prompted exploration of new lode deposits. Previous studies in the nearby Klondike gold district have shown correlation between placer deposits and bedrock occurrences. Poor bedrock exposure and a complex de...
Article
Full-text available
The Labrador Sea and Baffin Bay form an extinct Palaeogene oceanic spreading system, divided by a major continental transform, the Davis Strait, with the whole region defined as the Northwest Atlantic. The Davis Strait hosts the Ungava Fault Zone and is the central structural element of the Davis Strait Large Igneous Province (DSIP) that formed bro...
Article
Full-text available
In response to the COVID-19 pandemic and resultant cancelation of geoscience fieldwork, as well as outstanding accessibility issues inherent in conducting fieldwork, we developed a virtual geological fieldtrip (VFT) to the Huronian age deposits in the Whitefish Falls area, Ontario, Canada. This region is a geologically significant site in which man...
Preprint
In response to the COVID-19 pandemic, and resultant cancellation of geoscience fieldwork, as well as outstanding accessibility issues inherent in conducting fieldwork, we developed a virtual geological fieldtrip (VFT) to the Huronian age deposits in the Whitefish Falls area, Ontario, Canada. This region is a geologically significant site in which m...
Article
Full-text available
The intraplate western Quebec seismic zone (WQSZ) in eastern Canada experiences moderate seismicity that mainly results from reactivation of inherited structures under the present-day, NE-SW-striking regional maximum horizontal stress (SH) and, possibly to a minor extent, through stress perturbations in response to glacio-isostatic adjustment. This...
Article
The recent proliferation of deformable plate tectonic modelling techniques has provided a new direction in the study of plate tectonics with substantial implications for our understanding of plate deformation and past kinematics. Such models account for intraplate deformation, yet are highly variable in their inputs, capabilities and applications....
Article
The Mesozoic–Cenozoic separation of Greenland and North America produced the small oceanic basins of the Labrador Sea and Baffin Bay, connected via a complex transform system through the Davis Strait. During rifting and partial breakup sedimentary basins formed that record the changing regional sediment supply. The onshore and offshore stratigraphy...
Preprint
Full-text available
The Mesozoic-Cenozoic separation of Greenland and North America produced the small oceanic basins of the Labrador Sea and Baffin Bay, connected via a complex transform system through the Davis Strait. During rifting and partial breakup sedimentary basins formed that record the changing regional sediment supply. The onshore and offshore stratigraphy...
Article
Full-text available
Intraplate basin/structural inversion (indicating tectonic shortening) is a good marker of (“far-field”) tectonic stress regime changes that are linked to plate geometries and interactions, a premise that is qualitatively well-established in the literature. There is also quantitative evidence that Late Cretaceous-Palaeocene inversion of sedimentary...
Article
Full-text available
A probabilistic approach is presented for jointly inverting gravity gradient and magnetic data for 3D subsurface distributions of density and magnetic susceptibility. The coupling of the physical property models is incorporated in the inversion by using a cross-covariance matrix of density and magnetic susceptibility. This enables structural simila...
Article
The kinematic evolution of the West Iberian margin during the opening of the southern North Atlantic has been of interest for several decades and provides a well-constrained environment to study and develop new concepts related to the formation of non-volcanic (magma poor) passive margins. Building upon previous rigid and deformable plate tectonic...
Article
Full-text available
Reconstructions of the opening of the North Atlantic Ocean generally result in the Orphan Basin, offshore Newfoundland, Canada, lying approximately conjugate to the rift basins on the Irish Atlantic margin at the onset of seafloor spreading toward the end of the Early Cretaceous. Most of these plate reconstructions have involved rigid plates with p...
Article
The Goban Spur, offshore Ireland, is a magma-poor rifted continental margin conjugate to the well-studied Newfoundland margin, offshore Canada. Published studies demonstrated that a 70-km-wide zone of exhumed serpentinized mantle lies between oceanic crust and stretched continental crust at the seaward limit of Goban Spur. However, the along-strike...
Article
The prevalence of conjugate margin terminology and studies in the scientific literature is testimony to the contribution that this concept and approach has made to the study of passive margins, and more broadly extensional tectonics. However, when applied to the complex rift, transform and spreading system of the southern North Atlantic (i.e. the p...
Article
The North Atlantic Realm, defined as the region of Pangaea breakup north of the Charlie-Gibbs Fracture Zone, is the type example locality for the Wilson Cycle. It is the first place where Wegener’s continental drift hypothesis was tested using geodetic surveying and the source of some of the data most influential to development of the plate tectoni...
Preprint
The prevalence of conjugate margin terminology and studies in the scientific literature is testimony to the contribution that this concept and approach has made to the study of passive margins, and more broadly extensional tectonics. However, when applied to the complex rift, transform and spreading system of the southern North Atlantic (i.e. the p...
Article
Full-text available
The North Atlantic, extending from the Charlie Gibbs Fracture Zone to the north Norway-Greenland-Svalbard margins, is regarded as both a classic case of structural inheritance and an exemplar for the Wilson-cycle concept. This paper examines different aspects of structural inheritance in the Circum-North Atlantic region: 1) as a function of rejuven...
Article
The breakup of Laurasia to form the Northeast Atlantic Realm disintegrated an inhomogeneous collage of cratons sutured by cross-cutting orogens. Volcanic rifted margins formed that are underlain by magma-inflated, extended continental crust. North of the Greenland-Iceland-Faroe Ridge a new rift–the Aegir Ridge–propagated south along the Caledonian...
Article
Full-text available
Mesozoic‐Cenozoic rifting between Greenland and North America created the Labrador Sea and Baffin Bay, while leaving preserved continental lithosphere in the Davis Strait, which lies between them. Inherited crustal structures from a Palaeoproterozoic collision have been hypothesized to account for the tectonic features of this rift system. However,...
Article
The East Orphan, Porcupine, and Galicia Interior basins are several of the most promising basins for hydrocarbon exploration along the rifted continental margins of the southern North Atlantic Ocean. Despite having formed at similar geological times, the basins exhibit fundamental differences in symmetry, crustal thickness, sedimentary cover thickn...
Article
Full-text available
Significant, poly-phase deformation occurred prior to, simultaneous with, and after the opening of the North Atlantic Ocean. Understanding this deformation history is essential for understanding the regional development and the mechanisms controlling rifting and subsequent failure or breakup. Here, we primarily use published constraints to construc...
Article
We have studied the Mesozoic Budgell Harbour Stock (BHS), a gabbroic intrusion in north-central Newfoundland, Canada, using 3-D inversion of airborne gravity gradiometry data based on a probabilistic inversion method. Significantly, differences were observed between results when inverting the single Tzz component and when inverting the five-compone...
Conference Paper
Full-text available
The non-volcanic Newfoundland margin offshore eastern Canada formed after a period of lithospheric stretching and rifting which began in the Late Triassic to Early Cretaceous. This was followed by continental breakup resulting in separation of the Grand Banks and Iberia, and northern Newfoundland and Ireland in the Aptian-Albian. Despite the Newfou...
Conference Paper
Full-text available
Studies examining the margin evolution of the magma-poor Iberian-Newfoundland margins, defined the necking domain as the transition zone between hyperextended crust (i.e. <10 km) and the crust of normal thickness �30 km (e.g. Sutra et al. 2013). The necking domain corresponds to a tapered region where the interpreted seismic basement and Moho appea...
Conference Paper
Full-text available
Significant poly-phase deformation occurs in adjacent continental domains prior to, simultaneously with, and after continental breakup. Constraining this deformation is essential for understanding the regional development and the mechanisms driving and controlling rifting and breakup. Here, we primarily use published constraints to construct deform...
Conference Paper
Full-text available
The Northeast Atlantic, defined here as extending from the Charlie Gibbs Fracture Zone to the north Norway- Greenland-Svalbard margins, is often regarded as a classic case of inheritance and the Wilson-cycle concept. We examined different aspects of tectonic inheritance in the Circum-North Atlantic region (CNAR): 1) as a function of rejuvenation at...
Conference Paper
Full-text available
Mesozoic-Cenozoic rifting between Greenland and Canada created the Labrador Sea and Baffin Bay, while leaving preserved continental lithosphere in the Davis Strait which lies between them. Inherited crustal structures have been hypothesized to account for the tectonic features of the rift system. However, due to limited imaging of the region, the r...
Preprint
Full-text available
Mesozoic-Cenozoic rifting between Greenland and North America created the Labrador Sea and Baffin Bay, while leaving preserved continental lithosphere in the Davis Strait which lies between them. Inherited crustal structures from a Palaeoproterozoic collision have been hypothesized to account for the tectonic features of this rift system. However,...
Article
Full-text available
The data presented in this article are primarily related to the Tectonophysics research article “Rift-related magmatism on magma-poor margins: Structural and potential field analysys of the Mesozoic Notre Dame Bay intrusions, Newfoundland, Canada and their link to North Atlantic Opening” [1]. The present article contains structural geology data fro...
Conference Paper
Full-text available
We present 3-D inversion results of gravity gradiometry data over the Budgell Harbour Stock (BHS) intrusion, in northern-central Newfoundland, Canada, obtained using a probabilistic inversion method. We examine multiple density contrast models obtained by inverting the single component Tzz and by jointly inverting five independent components. The i...
Article
Full-text available
The onshore exposures adjacent to modern, offshore passive continental margins may preserve evidence of deformation from the pre-, syn- and post-rift phases of continental breakup that allow us to investigate the processes associated with and controlling rifting and breakup. Here, onshore brittle deformation from onshore Labrador in Eastern Canada...
Conference Paper
Full-text available
Successful breakup between the Newfoundland, Ireland and Iberian passive margins resulted in the separation of the Grand Banks from Iberia, and northern Newfoundland from Ireland, whilst Ireland also separated from East Greenland. Multiple, discrete rift events have been identified prior to lithospheric breakup. Breakup resulted in the formation of...
Article
Full-text available
Perron et al. describe a study into the role of inherited structures in intracratonic basins in the Central Sarara using a combination of seismic interpretation, various GIS analyses , stratigraphy and geochronology. In my opinion the background information is adequate (just requiring a few minor amendments), the analyses appear to have been approp...
Preprint
Full-text available
Mesozoic to Cenozoic continental rifting, breakup, and spreading between North America and Greenland led to the opening, from south to north, of the Labrador Sea and eventually Baf-fin Bay between Baffin Island, northeast Canada, and northwest Greenland. Baffin Bay lies at the northern limit of this extinct rift, transform, and spreading system and...
Conference Paper
Full-text available
During the last fifty years of seismic data acquisition and interpretation on the Newfoundland and Irish Atlantic rifted margins, a variety of theories about the origin, evolution, and timing of basin formation on these conjugate magma-poor margins have been proposed. These varying theories reflect the complex evolutionary history of these conjugat...
Conference Paper
Full-text available
Globally, passive margins are typically classified as either magma-rich or magma-poor. Despite this simple classification, magma-poor margins such as Newfoundland, do exhibit evidence of localized magmatism, as magmatism to some extent invariably accompanies all continental breakup. The magma-poor Newfoundland margin in Eastern Canada formed after...
Conference Paper
Full-text available
The Orphan Basin, offshore Newfoundland, Canada, is approximately conjugate to the rifted margin basins on the Irish Atlantic margin. At the onset of seafloor spreading leading to the opening of the modern North Atlantic Ocean, plate reconstructions, based solely on oceanic magnetic anomalies, show the Rockall Basin, west of Ireland, forming a cont...
Conference Paper
Full-text available
Intraplate basin/structural inversion is a good marker of ("far-field") tectonic stress regime changes that are linked to plate boundary reorganisations. The premise is well-established in the literature: how Late Cretaceous-Palaeocene inversion of sedimentary basins has occurred in north-central Europe, for example, can be linked explicitly with t...
Conference Paper
Full-text available
The Mesozoic-Cenozoic separation of Greenland and North America produced the small oceanic basins of the Labrador Sea and Baffin Bay, which are connected via the Davis Strait, a region mostly comprised of continental lithosphere. The preservation of continental crust in this region, the overall large-scale 'dog-leg' geometry, widespread magmatism a...
Poster
Full-text available
New insights about the evolution of the East Orphan Basin, West Orphan Basin, Rockall Basin, and the Porcupine Basin
Poster
Full-text available
The Orphan Basin, offshore Newfoundland, Canada, is approximately conjugate to the rifted margin basins on the Irish Atlantic margin. At the onset of seafloor spreading leading to the opening of the modern North Atlantic Ocean, plate reconstructions, based solely on oceanic magnetic anomalies, show the Rockall Basin, west of Ireland, forming a cont...
Conference Paper
Full-text available
The magma-poor Newfoundland margin formed after a period of rifting, followed by breakup resulting in separation of the Grand Banks from Iberia, and Northern Newfoundland from Ireland. Mesozoic-Cenozoic magmatic rocks have been documented on- and offshore Newfoundland that are cotemporaneous with rifting and breakup, with further magmatism occurrin...
Conference Paper
Full-text available
The original simple theory of plate tectonics had to be refined to accommodate second-order geological features such as back-arc basins and continental deformation zones. We propose an additional refinement that is required by complexities that form and persist in new oceans when inhomogeneous continental lithosphere/tectosphere disintegrates. Such...
Cover Page
Full-text available
Cover Image: The North Atlantic spreading system, showing the ages of oceanic crust, spreading axes, cotemporaneous igneous rocks and postulated hotspot tracks. For datasources and an alternative tectonic hypothesis, see Peace et al. in this issue. Image credit: Alexander L. Peace
Article
Full-text available
Breakup between Greenland and Canada resulted in oceanic spreading in the Labrador Sea and Baffin Bay. These ocean basins are connected through the Davis Strait, a bathymetric high comprising primarily continental lithosphere, and the focus of the West Greenland Tertiary volcanic province. It has been suggested that a mantle plume facilitated this...
Article
Full-text available
Intrusive magmatism is an integral and understudied component in both volcanic and non-volcanic passive margins. Here, we investigate the thermal effects of widespread (c. 20,000 km2) intrusive magmatism on the thermal evolution of organic-rich sedimentary rocks on the non-volcanic Newfoundland passive margin. ODP 210-1276 (45.41°N, 44.79°W) inters...
Article
Full-text available
Continental extension, subsequent rifting and eventual breakup result in the development of passive margins with transitional crust between extended continental crust and newly created oceanic crust. Globally, passive margins are typically classified as either magma-rich or magma-poor. Despite this simple classification, magma-poor margins like the...
Conference Paper
Full-text available
Continental rifting between Greenland and Canada began in the Early Cretaceous or possibly earlier and culminated in the production of oceanic crust in the Paleocene, and ultimately the formation of the Labrador Sea. The onshore exposures adjacent to modern, offshore passive continental margins, including Labrador, often preserve evidence of deform...
Thesis
Full-text available
Continental extension causes rifting and thinning of the lithosphere that may result in breakup and eventually the initiation of seafloor spreading and passive continental margin development. Ambiguity exists regarding the roles of magmatism and structural inheritance during rifting and continental breakup during this process. This study focuses on...
Presentation
Full-text available
Presentation given to the Northeastern Geological Society at Durham University on the 21st of October 2016
Article
Full-text available
The Labrador Sea is a small (∼900 km wide) ocean basin separating southwest Greenland from Labrador, Canada. It opened following a series of rifting events that began as early as the Late Triassic or Jurassic, culminating in a brief period of seafloor spreading commencing by polarity chron 27 (C27; Danian) and ending by C13 (Eocene-Oligocene bounda...
Conference Paper
Full-text available
The process of continental breakup involves a complex and variable sequence of events beginning with a period of continental extension causing rifting, and eventually the initiation of seafloor spreading. Continental breakup in the Baffin Bay – Labrador Sea system reached variable degrees of maturity along the margin. Full oceanic spreading was ini...
Conference Paper
Full-text available
The extent to which continental rifting and margin development is influenced by pre-existing anisotropies has been debated since Tuzo Wilson's seminal 1966 paper on Atlantic opening and closing. Structural inheritance results from stress concentration and shear localisation manifested at all scales in the continental lithosphere. Lithosphere-scale...