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Colin G. Macpherson
Durham University
GeologyBasaltGeochemistrySubductionMantle (geology)
94Publications
31H-index
3,811Citations
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Publications 108
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#1A Burton-Johnson (BAS: British Antarctic Survey)H-Index: 4
#2Colin G. Macpherson (Durham University)H-Index: 31
Last. Geoffrey M. Nowell (Durham University)H-Index: 13
view all 6 authors...
Abstract New field, geochemical, and geochronological data from the Segama Valley Felsic Intrusions (SVFI) of Sabah, north Borneo, shows them to be arc-derived tonalites; not windows or partial melts of a crystalline basement beneath Sabah. U Pb zircon ages date emplacement in the Triassic and Jurassic: 241.1 ± 2.0 Ma, 250.7 ± 1.9 Ma, 178.7 ± 2.4 Ma, and 178.6 ± 1.3 Ma; contemporaneous with peaks in magmatism and detrital zircons in Sarawak and west Kalimantan (west Borneo). Isotopic data for Sr...
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#1Yemane AsmeromH-Index: 36
#2James U. L. BaldiniH-Index: 19
Last. Douglas J. KennettH-Index: 43
view all 10 authors...
Large changes in hydroclimate in the Neotropics implied by proxy evidence, such as during the Little Ice Age (LIA), have been attributed to meridional shifts of the Intertropical Convergence Zone (ITCZ), although alternative modes of ITCZ variability have also been suggested. Here we use seasonally-resolved stalagmite rainfall proxy data from the modern northern limit of the ITCZ in southern Belize, combined with records from across the Neotropics and subtropics, to fingerprint ITCZ variability ...
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#1Harisma Andikagumi (Durham University)H-Index: 1
#1H. Andikagumi (Durham University)
Last. Ken McCaffrey (Durham University)H-Index: 30
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We present a spatial analysis of volcano distribution and morphology in the young, intraoceanic Mariana Arc. Both the quality of fit to idealised models and the divergence from those ideals indicate that Mariana Arc volcanoes are arranged into five great circle segments, rather than a single small circle or multiple small circles. The alignment of magmatic centres suggests that magma transport is controlled by the stress regime in the deep crust and/or lithospheric mantle of the Philippine Sea P...
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#1Lidong Bie (KIT: Karlsruhe Institute of Technology)H-Index: 5
#2Andreas Rietbrock (KIT: Karlsruhe Institute of Technology)H-Index: 33
Last. Marjorie Wilson (University of Leeds)H-Index: 42
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The Lesser Antilles arc is only one of two subduction zones where slow‐spreading Atlantic lithosphere is consumed. Slow‐spreading may result in the Atlantic lithosphere being more pervasively and heterogeneously hydrated than fast‐spreading Pacific lithosphere, thus affecting the flux of fluids into the deep mantle. Understanding the distribution of seismicity can help unravel the effect of fluids on geodynamic and seismogenic processes. However, a detailed view of local seismicity across the wh...
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#1Harisma AndikagumiH-Index: 1
#2Colin G. MacphersonH-Index: 31
Last. Ken McCaffreyH-Index: 30
view all 3 authors...
New 40Ar/39Ar ages are presented for volcanic rocks from the Karacadag Volcanic Complex (KVC) in SE Anatolia. These extend the oldest age recognised for the KVC for lavas from the Siverek Phase plateau basalt back to at least 17 Ma. Our data agree with prior studies that the second, Karacadag Phase of igneous activity began at about 4.5 Ma with a peak between 2 and 1 Ma, but in contrast to previous work we find that this included volcanism on the Mt. Karacadag ridge from the earliest part of thi...
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#1Lloyd T. White (RHUL: Royal Holloway, University of London)H-Index: 8
#2Nicholas Rawlinson (University of Cambridge)H-Index: 29
Last. Jason Phipps Morgan (RHUL: Royal Holloway, University of London)H-Index: 21
view all 10 authors...
Most of the world's explosive volcanoes are located in volcanic arcs, formed by fluid-fluxed melting of upper mantle rocks. The fluids that facilitate melting are released from subducted tectonic plates as they sink into the mantle. Yet, we have sparse knowledge of the migration pathways of melts through the upper mantle (i.e., between the surface of the subducted plate and arc volcanoes). We are also uncertain of the time required for this migration to occur. Here, we show evidence of two earth...
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#1A Burton-Johnson (BAS: British Antarctic Survey)H-Index: 4
#2Colin G. Macpherson (Durham University)H-Index: 31
Last. Adrian J. BoyceH-Index: 36
view all 5 authors...
New geochemical data are presented for the composite units of the Mount Kinabalu granitoid intrusion of Borneo and explore discrimination between crustal- and mantle-derived granitic magmas. The geochemical data demonstrate that the units making up this composite intrusion became more potassic through time. This was accompanied by an evolution of isotope ratios from a continental-affinity towards a slightly more mantle-affinity (87Sr/86Sri ∼0.7078; 143Nd/144Ndi ∼0.51245; 206Pb/204Pbi ∼18.756 for...
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#1H. Tim Breitfeld (RHUL: Royal Holloway, University of London)H-Index: 5
#2Colin G. Macpherson (Durham University)H-Index: 31
Last. Juliane Hennig-Breitfeld (RHUL: Royal Holloway, University of London)H-Index: 1
view all 6 authors...
Abstract We present new geochronological and geochemical data for Neogene magmatism from West Sarawak. Zircon U-Pb geochronology divides Neogene magmatic rocks of West Sarawak into a Lower Miocene West Sarawak Sintang Suite with ages of c. 19 to 21 Ma, and a Middle Miocene Bau Suite with ages of c. 12 to 14 Ma. Magmatism occurred in multiple short-lived pulses from approximately 24 Ma and was coeval with magmatic activity in NW Kalimantan and East Kalimantan. The majority of, but not all, Bau Su...
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#1George F. Cooper (Durham University)H-Index: 8
#2Jon D BlundyH-Index: 49
Last. Jon P. Davidson (Durham University)H-Index: 46
view all 5 authors...
Quantifying the storage conditions and evolution of different magmatic components within sub-volcanic plumbing systems is key to our understanding of igneous processes and products. Whereas erupted magmas represent a portion of the eruptible volcanic system, plutonic xenoliths provide a complementary record of the mushy roots of the plumbing system that cannot be mobilised easily to form lavas and consequently offer a unique record of magma diversity within the sub-volcanic plumbing system. Here...
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