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  • 1
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    P-wave tomography of eastern North America: Evidence for mantle evolution from Archean to Phanerozoic, and modification during subsequent hot spot tectonism (2013)
    Wiley
    Details
    Publication Date: 2013-01-05
    Description: [1]  The unique physical and chemical properties of cratonic lithosphere are thought to be key to its long-term survival and its resistance to pervasive modification by tectonic processes. Study of mantle structure in southeast Canada and the northeast US offers an excellent opportunity to address this issue because the region spans 3 billion years of Earth history, including Archean formation of the Superior craton and younger accretion of terranes to eastern Laurentia during the Proterozoic Grenville and Phanerozoic Appalachian orogenies. Trending NW–SE through each of these terranes is the track of the Great Meteor hot spot, which affected the region during the Mesozoic. Here we study mantle seismic velocity structure beneath this region of eastern North America using tomographic inversion of teleseismic P-wave relative arrival-times recorded by a large-aperture seismograph network. There are no large-scale systematic differences between Superior and Grenville mantle wave speed structure, which may suggest that tectonic stabilization of cratons occurred in a similar fashion during the Archean and Proterozoic. Cratonic lithosphere is largely thought to be resistant to modification by hot spot processes, in contrast to younger terranes where lithospheric erosion and significant magmatism are expected. Low velocities beneath the regions affected by the Great Meteor hot spot are broadest beneath the Paleozoic Appalachian terranes, indicating pervasive modification of the lithosphere during magmatism. The zone of modification narrows considerably into the Proterozoic Grenville province before disappearing completely in the Archean Superior craton, where the surface signature of Mesozoic magmatism is limited to kimberlite eruptions.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    A tale of two orogens: crustal processes in the Proterozoic Trans-Hudson and Grenville Orogens, eastern Canada (2017)
    Wiley
    In: Tectonics
    Details
    Publication Date: 2017-07-07
    Description: The Precambrian core of North America was assembled in the Proterozoic by a series of collisions between Archean cratons. Among the orogenic belts, two stand out due to their significant spatial extent. The Paleoproterozoic Trans-Hudson Orogen (THO) and Mesoproterozoic Grenville Orogen extend for thousands of kilometers along-strike and hundreds of kilometers across-strike. Both have been compared to the present-day Himalayan-Karakoram-Tibetan Orogen (HKTO). Over the last 20–30 years, active and passive-source seismic studies have contributed a wealth of information about the present-day crustal structure and composition of the two orogens in Canada. The Proterozoic orogenic crust is generally thicker than that of neighboring Archean terranes, with a more variable Moho character, ranging from relatively sharp to highly diffuse. Both orogens have a prominent high-velocity lower-crustal layer, consistent with long-term preservation of a partially-eclogitized root at the base of the crust and similar to that inferred beneath the western HKTO. Crustal structure in the northern THO strongly resembles the lower-crustal structure of the HKTO, suggesting that Moho depths may have reached 60–70 km when the orogen was active. A prominent mid-crustal discontinuity beneath the central Grenville Province and changes in the patterns of seismic anisotropy in the THO crust beneath Hudson Bay provide geophysical evidence that lower-crustal flow likely played a role in the evolution of both orogens, similar to that inferred beneath the present-day HKTO. The seismic evidence from Canada supports the notion of tectonic uniformitarianism, at least as far back as the Paleoproterozoic.
    Print ISSN: 0278-7407
    Electronic ISSN: 1944-9194
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    Notes on Justicia sect. Monechma (Acanthaceae) in Angola, including two new species (2019)
    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (2212-1676) vol.64 (2019) p.97
    Details
    Publication Date: 2019-05-10
    Description: Two new species of Justicia sect. Monechma, Justicia cubangensis and J. eriniae, are described from Angola. Their affinities are reviewed, together with a discussion on the correct generic name to apply to these species. A conspectus of Justicia sect. Monechma ‘Group I’ in Angola is presented, including a key to the species and notes on habitat and distribution for each taxon. Two new combinations and one new name are provided for species for which there was no previous name available in Justicia, and lectotypes are proposed for four names. Twelve species are recognised in this group in total, eight of which are currently believed to be endemic to Angola. Justicia subsessilis is recorded in Angola for the first time, and J. laeta is placed in sect. Monechma, having previously been tentatively referred to sect. Tyloglossa. Monechma carrissoi is considered to be conspecific with J. virgultorum and so is synonymised here. In addition, the botanical importance of the type locality of J. cubangensis, the Cuchi River gorge of the Cubango drainage, is highlighted and two further new provincial records for Cuando Cubango are noted from this site: Eriocaulon angustibracteum (Eriocaulaceae) and Crepidorhopalon schweinfurthii (Linderniaceae).
    Keywords: Cuando Cubango ; Huíla ; justicioid ; miombo ; Namibe ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 4
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    Hulemacanthus species (Acanthaceae: Barlerieae) in New Guinea (2012)
    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.57 (2012) nr.3 p.215
    Details
    Publication Date: 2015-03-06
    Description: A reassessment of Hulemacanthus type material has led to the recognition of two species in New Guinea. Clerodendrum friesii becomes a synonym of Hulemacanthus novoguineenis.
    Keywords: Acanthaceae ; Barlerieae ; Clerodendrum ; Hulemacanthus ; Lamiales ; New Guinea
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 5
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    Notes on the plant endemics of the quartzitic slopes of Mt Chimanimani (Mozambique & Zimbabwe), and a new, Critically Endangered species, Empogona jenniferae (Rubiaceae-Coffeeae) (2018)
    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (2212-1676) vol.63 (2018) p.87
    Details
    Publication Date: 2018-07-09
    Description: Empogona jenniferae is described from the upper quartzitic slopes of Mt Chimanimani on both sides of the Zimbabwe-Mozambique border, a prospective Tropical Important Plant Area. Its conservation status is assessed as Critically Endangered under the 2012 IUCN criteria. A figure and notes on the endemic plant species of Chimanimani are provided. Two additional names in Empogona, E. congesta and E. congesta subsp. chasei are published.
    Keywords: conservation ; new combinations ; TIPA ; Tricalysia ; Tropical Important Plant Area
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 6
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    Coleus namuliensis and Coleus caudatus (Lamiaceae):a new species and a new combination in the Afromontane flora of Mozambique and Zimbabwe (2017)
    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (2212-1676) vol.62 (2017) p.168
    Details
    Publication Date: 2017-10-23
    Description: The new species Coleus namuliensis (Lamiaceae) is described from the granite outcrops and grasslands of Mt Namuli in Zambezia Province of Mozambique. It has previously been confused with Plectranthus caudatus, a species that is restricted to the quartzite outcrops of the Chimanimani Mountains on the Mozambique-Zimbabwe border for which the new combination in Coleus is formalised in this paper. Other potential confusion species are discussed and a rationale for applying the generic name Coleus rather than Plectranthus is provided. Despite their highly restricted ranges, C. namuliensis and C. caudatus are both considered to have a conservation status of Least Concern at present, although climate change may pose a longer-term threat to their survival.
    Keywords: endemic species ; IUCN conservation assessment ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 7
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    Coleus namuliensis and Coleus caudatus (Lamiaceae):a new species and a new combination in the Afromontane flora of Mozambique and Zimbabwe (2017)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 62, pp. 168-173
    Details
    Publication Date: 2024-01-12
    Description: The new species Coleus namuliensis (Lamiaceae) is described from the granite outcrops and grasslands of Mt Namuli in Zambezia Province of Mozambique. It has previously been confused with Plectranthus caudatus, a species that is restricted to the quartzite outcrops of the Chimanimani Mountains on the Mozambique-Zimbabwe border for which the new combination in Coleus is formalised in this paper. Other potential confusion species are discussed and a rationale for applying the generic name Coleus rather than Plectranthus is provided. Despite their highly restricted ranges, C. namuliensis and C. caudatus are both considered to have a conservation status of Least Concern at present, although climate change may pose a longer-term threat to their survival.
    Keywords: endemic species ; IUCN conservation assessment ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 8
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    Hulemacanthus species (Acanthaceae: Barlerieae) in New Guinea (2012)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 57 no. 3, pp. 215-216
    Details
    Publication Date: 2024-01-12
    Description: A reassessment of Hulemacanthus type material has led to the recognition of two species in New Guinea.\nClerodendrum friesii becomes a synonym of Hulemacanthus novoguineenis.
    Keywords: Acanthaceae ; Barlerieae ; Clerodendrum ; Hulemacanthus ; Lamiales ; New Guinea
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 9
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    Notes on the plant endemics of the quartzitic slopes of Mt Chimanimani (Mozambique & Zimbabwe), and a new, Critically Endangered species, Empogona jenniferae (Rubiaceae-Coffeeae) (2018)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 63, pp. 87-92
    Details
    Publication Date: 2024-06-25
    Description: Empogona jenniferae is described from the upper quartzitic slopes of Mt Chimanimani on both sides of the Zimbabwe-Mozambique border, a prospective Tropical Important Plant Area. Its conservation status is assessed as Critically Endangered under the 2012 IUCN criteria. A figure and notes on the endemic plant species of Chimanimani are provided. Two additional names in Empogona, E. congesta and E. congesta subsp. chasei are published.
    Keywords: conservation ; new combinations ; TIPA ; Tricalysia ; Tropical Important Plant Area
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 10
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    A revision of the Crepidorhopalon whytei complex (Linderniaceae) in eastern Africa (2019)
    Naturalis Biodiversity Center
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 64 no. 2, pp. 165-176
    Details
    Publication Date: 2024-07-03
    Description: The Crepidorhopalon whytei (Linderniaceae) species complex is revised using morphological analyses. Based primarily on variations in indumentum, floral morphology, corolla colour and seed morphology, four species are formally recognised within this group in eastern Africa. Crepidorhopalon whytei s.str. is widespread in the highlands of eastern Africa, extending from South Sudan and Ethiopia in the north through to western Tanzania in the south. A new combination in Crepidorhopalon is made for Lindernia flava (= C. flavus), which is confined to the Manica Highlands of the Mozambique-Zimbabwe border. Two new species are described, C. namuliensis which is known only from Mt Namuli in northern Mozambique and C. kwaleensis which is known only from the coastal lowlands of southeast Kenya. A fifth, imperfectly known species is documented from the Nguru Mountains of Tanzania where it is so far known from a single collection. Three names are lectotypified. The habitat requirements and distribution are documented and the extinction risk is assessed for each species. Crepidorhopalon flavus is assessed as globally Vulnerable and C. kwaleensis as globally Endangered, while C. namuliensis and C. whytei are currently considered to be of Least Concern, although the latter is declining markedly in parts of its range. The botanical importance of the key sites for the newly recognised taxa is discussed.
    Keywords: Plant Science ; Ecology ; Evolution ; Behavior and Systematics
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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