Sheree E. ArmisteadUniversity of Tasmania · ARC Centre of Excellence in Ore Deposits (CODES)
Sheree E. Armistead
PhD
About
36
Publications
22,154
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696
Citations
Citations since 2017
Introduction
Additional affiliations
September 2019 - September 2021
Geological Survey of Canada
Position
- PostDoc Position
September 2019 - September 2021
October 2015 - August 2019
Education
March 2010 - November 2013
Publications
Publications (36)
Neoproterozoic tectonic geography was dominated by the formation of the supercontinent Rodinia, its break-up and the subsequent amalgamation of Gondwana. The Neoproterozoic was a tumultuous time of Earth's history, with large climatic variations, the emergence of complex life and a series of continent-building orogenies of a scale not repeated unti...
Madagascar is a key area for unraveling the geodynamic evolution of the transition between the Rodinia and Gondwana supercontinents as it contains several suites of c. 850–700 Ma magmatic rocks that have been postulated to correlate with other Rodinian terranes. The Bemarivo Domain of northern Madagascar contains the youngest of these units that da...
The Adelaide Rift Complex in South Australia records the break-up of Rodinia at a time of great climatic and biological evolution. The Boucaut Volcanics within the Neoproterozoic Adelaide Rift Complex of the Adelaide Superbasin lie at the base of the Burra Group, marking the boundary between the Burra Group and underlying Callanna Group. Despite th...
The Neoarchaean to Palaeoproterozoic Betsiboka Suite of Madagascar mainly consists of granitoid orthogneiss and migmatite variably metamorphosed to amphibolite and granulite facies during the late Neoproterozoic. New U-Pb zircon data yielded emplacement ages of 2512 ± 17 Ma, 2507 ± 17 Ma, 2493 ± 14 Ma, and 2485 ± 16 Ma. Zircon d ¹⁸ O data indicate...
The package PbIso is a free and open R toolbox for commonly used calculations and plots of Pb-Pb isotope data. In this paper, we review Pb isotope systematics and the calculations that are commonly used, such as model age, model source (238 U/ 204 Pb), time-integrated (232 Th/ 238 U), and initial Pb isotope ratios. These complicated equations are i...
Central and southern Madagascar comprise a number of distinctive Archaean crustal blocks (the Antongil-Masora and Antananarivo domains) overlain by Proterozoic supracrustal sequences, preserved in the East African Orogen. Here, we present U–Pb and Lu–Hf isotopic data for two supracrustal units from detrital and metamorphic zircon grains. The lower...
Recent progress in plate tectonic reconstructions has seen models move beyond the classical idea of continental drift by attempting to reconstruct the full evolving configuration of tectonic plates and plate boundaries. A particular problem for the Neoproterozoic and Cambrian is that many existing interpretations of geological and palaeomagnetic da...
Madagascar hosts several Paleoproterozoic sedimentary sequences that are key to unraveling the geodynamic evolution of past supercontinents on Earth. New detrital zircon U–Pb and Hf data, and a substantial new database of ∼15,000 analyses are used here to compare and contrast sedimentary sequences in Madagascar, Africa, and India. The Itremo Group...
Recent progress in plate tectonic reconstructions has seen models move beyond the classical idea of continental drift by attempting to reconstruct the full evolving configuration of tectonic plates and plate boundaries. A particular problem for the Neoproterozoic and Cambrian is that many existing interpretations of geological and palaeomagnetic da...
The Adelaide Rift Complex in South Australia records the break-up of Rodinia at a time of great climatic and biological evolution. The Boucaut Volcanics within the Neoproterozoic Adelaide Rift Complex lie at the base of the Burra Group, marking the boundary between the Burra Group and underlying Callanna Group. Despite their significance as one of...
This contribution uses several case studies to illustrate how regional aeromagnetic and gravity data is used to undertake tectonic analysis. Regional aeromagnetic and gravity data is a powerful tool for tectonic analysis because it can be interpreted and modelled at different scales, and it is very effective at imaging different crustal levels. The...
Madagascar occupied an important place in the amalgamation of Gondwana, and preserves a record of several Neoproterozoic events that can be linked to orogenesis of the East African Orogen. We integrate remote sensing and field data to unravel complex deformation in the Ikalamavony and Itremo domains of central Madagascar. The deformation sequence c...
Madagascar is important for unravelling the geodynamic evolution of the transition between the Rodinia and Gondwana supercontinents as it contains several suites of c. 850–700 Ma magmatic rocks that have been postulated to correlate with other ex-Rodinia terranes. The Bemarivo Belt of northern Madagascar contains the youngest suite of these magmati...
The Itremo Group of central Madagascar is made up of quartzites, schists and marbles. Understanding the provenance of the Itremo Group allows us to interpret the tectonic geography at the time of deposition. Published detrital zircons from the Itremo Group indicate the maximum depositional age is c. 1600 Ma, with dominant age peaks at c. 1850 Ma, c...
The assembly of central Gondwana occurred along the Neoproterozoic-Cambrian East African Orogen. In Madagascar, this major orogenic event occurred by at least two separate orogenies, the eastern Malagasy Orogeny, associated with the closure of the "Betsimisaraka Suture" and the East African Orogeny, associated with the closure of a suture in southw...
The assembly of central Gondwana occurred along the Neoproterozoic-Cambrian East African Orogen. This formed by at least two orogenies; the c. 650 Ma East African Orogeny and the c. 550-530 Ma Malagasy Orogeny. How these orogenies deformed terranes in central Madagascar has not yet been studied in detail. Understanding the style and extent of defor...
It has long been recognised that Madagascar was contiguous with India until the Late Cretaceous. However, the timing and nature of the amalgamation of these two regions remain highly contentious as is the location of Madagascar against India in Gondwana. Here we address these issues with new U-Pb and Lu-Hf zircon data from five metasedimentary samp...
It has long been recognised that Madagascar was contiguous with India until the Late Cretaceous, however the timing and nature of the amalgamation of these two regions is still highly contentious as is the location of Madagascar against India in Gondwana. We have collected new detrital zircon U-Pb and Lu-Hf data from the Karwar region of west penin...
The assembly of central Gondwana occurred along the Neoproterozoic–Cambrian East African Orogen. This formed by at least two orogenies; the c. 650 Ma East African Orogeny and the c. 550–530 Ma Malagasy Orogeny. How these orogenies deformed terranes in central Madagascar has not yet been studied in detail. Understanding the style and extent of defor...
As part of a multidisciplinary study of the region by Geoscience Australia and the geological surveys of New South Wales and Queensland, the mineral systems at the Cuttaburra and F1 prospects have been investigated with the aim of better understanding the prospectivity of the southern Thomson Orogen. Samples from three drill holes at the Cuttaburra...
This record presents new zircon U–Pb geochronological data, obtained via Sensitive High Resolution Ion Microprobe (SHRIMP) for eleven samples of plutonic and volcanic rocks from the Lachlan Orogen, and the New England Orogen. The work is part of an ongoing Geochronology Project (Metals in Time), conducted by the Geological Survey of New South Wales...
It has long been recognised that Madagascar was contiguous with India until the Late Cretaceous, however the timing and nature of the amalgamation of these two regions is still highly contentious. It has been suggested that Madagascar was contiguous with India by the latest Neoproterozoic to Cambrian, forming the Malagasy Orogeny [1]. Other models...
It has long been recognised that Madagascar was contiguous with India until the Late Cretaceous, however the timing and nature of the amalgamation of these two regions during the Archaean and Proterozoic is still highly contentious. Recent research has proposed that the Betsimisaraka Suture of eastern Madagascar extends into west peninsular India a...
The Southern Thomson Orogen VTEMplus® Airborne Electromagnetic (AEM) survey was undertaken as part of Geoscience Australia’s contribution to the Australian Academy of Science’s UNCOVER initiative, which has been adopted as part of the Australia Government’s National Mineral Exploration Strategy. The aim of the survey was to demonstrate the applicat...
The Curnamona Province that straddles the South Australia and New South Wales border is an emerging region of IOCG exploration interest, with several IOCG deposits already recognised. Within the Curnamona Province is the Benagerie Ridge Magnetic Complex (BRMC) which contains the North Portia Cu-Au-Mo deposit. We integrate detailed drillcore logging...
Geoscience Australia, in collaboration with the Geological Survey of New South Wales and the Geological Survey of Queensland, is investigating the regional geology and mineral systems of the southern Thomson orogen in the Tasman Element of eastern Australia. Much of this region is undercover and poorly understood. In particular, the geological rela...
Projects
Projects (5)
Here we are using GPlates to reconstruct full plate (ocean+continent) reconstructions of the Neoproterozoic world using the more reliable palaeomagnetic solutions and the extensive geology of the Neoproterozoic to unravel the tectonic geography of the planet over this ca. 500 million years of Earth history.
The Southern Granulite Terrane of India makes up all of Kerala, most of Tamil Nadu and a part of Karnataka. It is a large region of high-grade rocks that represent at least two major orogenies separated by billions of years. In the north are Archaean and Palaeoproterozoic tectonothermal events, whilst south of the Cauvery Shear Zone is an exhumed orogenic plateau from the Gondwana-forming Ediacaran-Cambrian southern East African Orogen. We have been working for more than a decade to better understand the tectonic evolution of this fascinating area and to put it in a global context.
