Kevin Charles Anthony Burke | |
---|---|
Born | November 13, 1929 London, UK |
Died | March 21, 2018 (age 88) Gloucester, Massachusetts, USA |
Nationality | British |
Citizenship | UK (1929-1979), USA (1979-2018) |
Education | PhD, University of London, 1953 |
Occupation | Professor of Geology |
Employers | University of Ghana (1953-1956) * British Geological Survey (1956-1961) * University of the West Indies (1961-1965) * University of Ibadan (1965-1972) * SUNY Albany (1973-1983) * Lunar and Planetary Institute (1983-1988) * University of Houston (1983-2018) |
Organizations | University of Toronto (1972-1973) * Geological Survey of Norway (2003-2009) * Physics of Geological Processes, University of Oslo (2009-2013) * Centre for Advanced Study at the Norwegian Academy of Science and Letters (2010) * Centre for Earth Evolution and Dynamics, University of Oslo (2013-2016) |
Known for | Contributions in plate tectonics |
Awards | GSA Career Contribution Award (2004) * Penrose Medal (2007) * Arthur Holmes Medal (2014) |
Kevin C. A. Burke (Kevin Charles Anthony Burke, November 13, 1929 - March 21, 2018) was a geologist known for his contributions in the theory of plate tectonics. [1] [2] In the course of his life, Burke held multiple professorships, [1] [3] most recent of which (1983-2018) was the position of professor of geology and tectonics at the Department of Earth and Atmospheric Science, University of Houston. His studies on plate tectonics, deep mantle processes, sedimentology, erosion, soil formation and other topics extended over several decades and influenced multiple generations of geologists and geophysicists around the world. [1] [3]
Kevin Burke was born on November 13, 1929, in London, England, to a cultured family of Irish descent. [3] He obtained his B.Sc. degree from University College London in 1951, and a Ph.D. degree from the University of London in 1953. His Ph.D. study focused on mapping and dating Barrovian metamorphic rocks and granites in the Connemara area of western Ireland. [1]
From 1953 to 1972, Burke held a series of teaching and research positions in geology, including a lecturer position at the University College of the Gold Coast (now the University of Ghana, 1953–1956) and a senior geologist position at the Atomic Energy Division of the British Geological Survey (1956–1961). [3] While at the British Geological Survey, he worked in the east African rift and in South Korea. During that time he married his lifelong companion, Angela Marion Burke. From 1961 to 1965, Burke was the head of the Geology Department at the University of the West Indies in Kingston, Jamaica, and held a position of the head of the Geology Department at the University of Ibadan, Nigeria, from 1965 to 1972. [3]
A critical turn in Burke's career occurred in 1972–1973 when he became a visiting professor at the University of Toronto, Canada. There, he became a close associate of J. Tuzo Wilson, who at that time was one of the most prominent proponents of plate tectonics and studies of volcanic hotspots. During his time in Toronto with Wilson, Burke began a lifelong study of hotspots, [4] [5] rifting [6] and mantle processes, [7] [8] which was enhanced by his previous field experiences in Africa and the Caribbean. [9] [10]
In 1973, Burke was invited by John F. Dewey to join the faculty at the State University of New York at Albany, which had assembled a group of geoscientists interested in plate tectonics, hotspot studies, rifting, and field-based ophiolite studies. During his 10-year residence in Albany, Burke produced many seminal papers on continental rifting, [11] [7] [12] hotspots, [13] [14] Caribbean tectonics, [15] [16] [17] and the effects of continent-continent collision in Asia and other places. [18] [19] [20] [21]
In 1983, Burke joined the faculty of the University of Houston and also worked as director and associate director of the Lunar and Planetary Institute at NASA in Houston until 1988. In the 1990s and 2000s, in addition to mentoring graduate students and teaching at the University of Houston, he held many visiting professorships at NASA, JPL, UCLA, Carnegie Institute, and the University of Oslo, Norway.
From 2003 and until his death in 2018, Kevin Burke worked in close collaboration with Trond H. Torsvik, who was then the head of the Geodynamics research group at the Geological Survey of Norway and later became a professor of geology at the University of Oslo, Norway. This collaboration resulted in several seminal contributions, describing the causal links between the two large-scale structures in the lowermost part of the Earth mantle (Large Low Shear-wave Velocity Provinces, or LLSVPs), the large-scale geometry of mantle convection, mantle plumes and surface hotspot volcanism. [22] [23] [24] [25]
Burke was the first who recognized that the most prominent mantle plumes feeding active hotspots rose from the margins of LLSVPs, which he termed the "Plume Generation Zones" (PGZs). [26] Evidence for long-term stability of LLSVPs (over time scales of hundreds of millions of years) from paleogeographic reconstructions of large igneous provinces [22] [23] [27] and kimberlites, [24] led Burke and Torsvik to develop a new approach to absolute plate reconstructions (PGZ method), [28] in which the geological records of hotspot volcanism are used to constrain the longitudinal positions of lithospheric plates in the originally unconstrained reconstructions based on paleomagnetism. [25] This work stimulated renewed interest to the LLSVPs in the geosciences community, resulting in a growing number of studies aimed to address the origin and evolution of the LLSVP structures in the lowermost mantle. [29] [30] [31] The long-term temporal stability of LLSVPs has not yet been fully accepted by the scientific community and remains a field of on-going debate and active research. [32]
Over his entire scientific career, Kevin Burke was a very active member of the geological and geophysical scientific community. Burke was a member of the Geological Society of London, the Geological Society of America, the American Geophysical Union, the American Association of Petroleum Geologists, the European Geosciences Union, the Nigerian Mining Geological and Metallurgical Society, the Nigerian Association of Petroleum Explorationists, and the Houston Geological Society. [2] He also served on many national committees, including the National Science Foundation, the National Research Council, NASA, and the National Academy of Sciences. [3]
Kevin Burke died of a heart attack at the age of 88. He died at Addison Gilbert Hospital in Gloucester, Massachusetts, on March 21, 2018. [33] Burke was survived by a brother and sister, three children and two grandchildren.
The EOS magazine of the American Geophysical Union paid a tribute to Kevin Burke by publishing an article, in which he was described as a "complete geologist of the ilk of Charles Lyell, Alexander von Humboldt, Eduard Suess, or Arthur Holmes." [3]
Burke's lifetime achievement awards include the Geological Society of America (GSA) Structural Geology and Tectonics Career Contribution Award (2004); [1] the Penrose Medal, the highest award of the Geological Society of America (2007); [34] and the Arthur Holmes Medal and Honorary Membership, one of the most prestigious awards of the European Geosciences Union (2014). [35]
The Samoan archipelago is a chain of 16 islands and numerous seamounts covering 3,123 km2 (1,206 sq mi) in the central South Pacific, south of the equator, about halfway between Hawaii and New Zealand, forming part of Polynesia and of the wider region of Oceania. The islands are Savaiʻi, Upolu, Tutuila, ’Uvea, Taʻū, Ofu, Olosega, Apolima, Manono, Nuʻutele, Niulakita, Nuʻulua, Namua, Fanuatapu, Rose Atoll, Nu'ulopa, as well as the submerged Vailuluʻu, Pasco banks, and Alexa Bank.
A mantle plume is a proposed mechanism of convection within the Earth's mantle, hypothesized to explain anomalous volcanism. Because the plume head partially melts on reaching shallow depths, a plume is often invoked as the cause of volcanic hotspots, such as Hawaii or Iceland, and large igneous provinces such as the Deccan and Siberian Traps. Some such volcanic regions lie far from tectonic plate boundaries, while others represent unusually large-volume volcanism near plate boundaries.
The core–mantle boundary (CMB) of Earth lies between the planet's silicate mantle and its liquid iron–nickel outer core, at a depth of 2,891 km (1,796 mi) below Earth's surface. The boundary is observed via the discontinuity in seismic wave velocities at that depth due to the differences between the acoustic impedances of the solid mantle and the molten outer core. P-wave velocities are much slower in the outer core than in the deep mantle while S-waves do not exist at all in the liquid portion of the core. Recent evidence suggests a distinct boundary layer directly above the CMB possibly made of a novel phase of the basic perovskite mineralogy of the deep mantle named post-perovskite. Seismic tomography studies have shown significant irregularities within the boundary zone and appear to be dominated by the African and Pacific Large Low-Shear-Velocity Provinces (LLSVP).
A large igneous province (LIP) is an extremely large accumulation of igneous rocks, including intrusive and extrusive, arising when magma travels through the crust towards the surface. The formation of LIPs is variously attributed to mantle plumes or to processes associated with divergent plate tectonics. The formation of some of the LIPs in the past 500 million years coincide in time with mass extinctions and rapid climatic changes, which has led to numerous hypotheses about causal relationships. LIPs are fundamentally different from any other currently active volcanoes or volcanic systems.
The Iceland hotspot is a hotspot which is partly responsible for the high volcanic activity which has formed the Iceland Plateau and the island of Iceland.
Mantle convection is the very slow creeping motion of Earth's solid silicate mantle as convection currents carry heat from the interior to the planet's surface.
The New England hotspot, also referred to as the Great Meteor hotspot and sometimes the Monteregian hotspot, is a volcanic hotspot in the North Atlantic Ocean. It created the Monteregian Hills intrusions in Montreal and Montérégie, the White Mountains intrusions in New Hampshire, the New England and Corner Rise seamounts off the coast of North America, and the Seewarte Seamounts east of the Mid-Atlantic Ridge on the African Plate, the latter of which include its most recent eruptive center, the Great Meteor Seamount. The New England, Great Meteor, or Monteregian hotspot track has been used to estimate the movement of the North American Plate away from the African Plate from the early Cretaceous period to the present using the fixed hotspot reference frame.
The Hikurangi Plateau is an oceanic plateau in the South Pacific Ocean east of the North Island of New Zealand. It is part of a large igneous province (LIP) together with Manihiki and Ontong Java, now located 3,000 km (1,900 mi) and 3,500 km (2,200 mi) north of Hikurangi respectively. Mount Hikurangi, in Māori mythology the first part of the North Island to emerge from the ocean, gave its name to the plateau.
Polar wander is the motion of a pole in relation to some reference frame. It can be used, for example, to measure the degree to which Earth's magnetic poles have been observed to move relative to the Earth's rotation axis. It is also possible to use continents as reference and observe the relative motion of the magnetic pole relative to the different continents; by doing so, the relative motion of those two continents to each other can be observed over geologic time as paleomagnetism.
The Manihiki Plateau is an oceanic plateau in the south-west Pacific Ocean. The Manihiki Plateau was formed by volcanic activity 126 to 116 million years ago during the mid-Cretaceous period at a triple junction plate boundary called the Tongareva triple junction. Initially at 125 million years ago the Manihiki Plateau formed part of the giant Ontong Java-Manihiki-Hikurangi plateau.
The Society hotspot is a volcanic hotspot in the south Pacific Ocean which is responsible for the formation of the Society Islands, an archipelago of fourteen volcanic islands and atolls spanning around 720 kilometres (450 mi) of the ocean which formed between 4.5 and <1 Ma.
Plate reconstruction is the process of reconstructing the positions of tectonic plates relative to each other or to other reference frames, such as the Earth's magnetic field or groups of hotspots, in the geological past. This helps determine the shape and make-up of ancient supercontinents and provides a basis for paleogeographic reconstructions.
Carmen Gaina is the Director of the Centre for Earth Evolution and Dynamics (CEED) a Norwegian Centre of Excellence hosted at the Department of Geosciences, University of Oslo, Norway.
In geology, the slab is a significant constituent of subduction zones.
Large low-shear-velocity provinces, LLSVPs, also called LLVPs or superplumes, are characteristic structures of parts of the lowermost mantle of Earth. These provinces are characterized by slow shear wave velocities and were discovered by seismic tomography of deep Earth. There are two main provinces: the African LLSVP and the Pacific LLSVP. Both extend laterally for thousands of kilometers and possibly up to 1,000 kilometres vertically from the core–mantle boundary. The Pacific LLSVP is 3,000 kilometers across, and underlies four hotspots that suggest multiple mantle plumes underneath. These zones represent around 8% of the volume of the mantle. Other names for LLSVPs include "superswells", "thermo-chemical piles", or "hidden reservoirs". Most of these names, however, are more interpretive of their proposed geodynamical or geochemical effects. For example, the name "thermo-chemical pile" interprets LLSVPs as lower-mantle piles of thermally hot and/or chemically distinct material. LLSVPs are still relatively mysterious, and many questions remain about their nature, origin, and geodynamic effects.
Ultra low velocity zones (ULVZs) are patches on the core-mantle boundary that have extremely low seismic velocities. The zones are mapped to be hundreds of kilometers in diameter and tens of kilometers thick. Their shear wave velocities can be up to 30% lower than surrounding material. The composition and origin of the zones remain uncertain. The zones appear to correlate with edges of the African and Pacific large low-shear-velocity provinces (LLSVPs) as well as the location of hotspots.
Magellan Rise is an oceanic plateau in the Pacific Ocean, which covers a surface area of 500,000 square kilometres (190,000 sq mi). There is another geological structure with the same name west from the Marshall Islands.
Intraplate volcanism is volcanism that takes place away from the margins of tectonic plates. Most volcanic activity takes place on plate margins, and there is broad consensus among geologists that this activity is explained well by the theory of plate tectonics. However, the origins of volcanic activity within plates remains controversial.
Joann Stock is a professor at California Institute of Technology known for her research into plate tectonics, particularly on changes in plate boundaries over geological time.
Andréa Tommasi is a geoscientist from Brazil known for her research on geodynamics and terrestrial deformation. She is a recipient of the CNRS silver medal and an elected fellow of the American Geophysical Union.