43 Result(s)
within
Martin J. Whitehouse
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Article
Open AccessDetection of apatite in ferroan anorthosite indicative of a volatile-rich early lunar crust
Determination of the systematics of volatile elements (for example, H, Cl, S) of the early Moon is one of the main objectives of lunar science. This has been hindered by the lack of the main volatile-bearing m...
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Open AccessMicrostructural and isotopic analysis of shocked monazite from the Hiawatha impact structure: development of porosity and its utility in dating impact craters
U–Pb geochronology of shocked monazite can be used to date hypervelocity impact events. Impact-induced recrystallisation and formation of mechanical twins in monazite have been shown to result in radiogenic Pb...
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Open AccessThe nature of the Karoo mantle source region from the perspective of olivine in the Luenha picrites: an oxygen isotopic and chemical study
The Karoo large igneous province has been divided into rift zone and basin-related groups, with picrites from the Luenha river, Mozambique, representing an end-member of the latter. New O isotope, major and tr...
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Open AccessRapid shifting of a deep magmatic source at Fagradalsfjall volcano, Iceland
Recent Icelandic rifting events have illuminated the roles of centralized crustal magma reservoirs and lateral magma transport1–4, important characteristics of mid-ocean ridge magmatism1,5. A consequence of such ...
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The volatile and trace element composition of apatite in the Skaergaard intrusion, East Greenland
We present a systematic examination of the volatile (Cl, F, Br, S) and trace element (Na, Mg, V, Mn, Fe, Sr, Y, Zr, Ba, REEs, Th, U) abundances in apatite from 29 samples from base to top of the Layered Series...
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High-resolution EBSD and SIMS U–Pb geochronology of zircon, titanite, and apatite: insights from the Lac La Moinerie impact structure, Canada
High-resolution electron backscattered diffraction (EBSD) and correlated in situ secondary ion mass spectrometry (SIMS) U–Pb geochronology have been conducted on impact-metamorphosed zircon, titanite, and apat...
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Open AccessSunda arc mantle source δ18O value revealed by intracrystal isotope analysis
Magma plumbing systems underlying subduction zone volcanoes extend from the mantle through the overlying crust and facilitate protracted fractional crystallisation, assimilation, and mixing, which frequently o...
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Open AccessShocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland
Impact ejecta formation and emplacement is of great importance when it comes to understanding the process of impact cratering and consequences of impact events in general. Here we present a multidisciplinary i...
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Evolution and Mineralization of the Precambrian Basement of Yemen
The Precambrian basement in Yemen consists of several diverse terranes that were amalgamated during the late Neoproterozoic closure of the Mozambique Ocean and final assembly of East and West Gondwana. The ter...
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Open AccessExceptional sulfur and iron isotope enrichment in millimetre-sized, early Palaeozoic animal burrows
Pyrite-δ34S and -δ56Fe isotopes represent highly sensitive diagnostic paleoenvironmental proxies that express high variability at the bed (< 10 mm) scale that has so far defied explanation by a single formative p...
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Open AccessMetallomics in deep time and the influence of ocean chemistry on the metabolic landscapes of Earth’s earliest ecosystems
Modern biological dependency on trace elements is proposed to be a consequence of their enrichment in the habitats of early life together with Earth’s evolving physicochemical conditions; the resulting metalli...
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Open AccessUncovering and quantifying the subduction zone sulfur cycle from the slab perspective
Sulfur belongs among H2O, CO2, and Cl as one of the key volatiles in Earth’s chemical cycles. High oxygen fugacity, sulfur concentration, and δ34S values in volcanic arc rocks have been attributed to significant ...
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Open AccessIn situ Rb-Sr dating of slickenfibres in deep crystalline basement faults
Establishing temporal constraints of faulting is of importance for tectonic and seismicity reconstructions and predictions. Conventional fault dating techniques commonly use bulk samples of syn-kinematic illit...
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Open AccessTiming and origin of natural gas accumulation in the Siljan impact structure, Sweden
Fractured rocks of impact craters may be suitable hosts for deep microbial communities on Earth and potentially other terrestrial planets, yet direct evidence remains elusive. Here, we present a study of the l...
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Open AccessPb nanospheres in ancient zircon yield model ages for zircon formation and Pb mobilization
Nanospheres of lead (Pb) have recently been identified in zircon (ZrSiO4) with the potential to compromise the veracity of U-Pb age determinations. The key assumption that the determined age is robust against the...
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Baddeleyite formation in zircon by Ca-bearing fluids in silica-saturated systems in nature and experiment: resetting of the U–Pb geochronometer
Intergrowths of baddeleyite have been found in zircon grain interiors from amphibolite- and granulite-facies felsic rocks from southwest Greenland. The zircon grains are either close to or in direct contact wi...
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Open AccessIsotopic evidence for temperate oceans during the Cambrian Explosion
The Cambrian Explosion was a key event in the evolution of life on Earth. This event took place at a time when sea surface temperatures have been proposed to reach about 60 °C. Such high temperatures are clear...
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Open AccessGneiss-forming events in the Saglek Block, Labrador; a reappraisal of the Uivak gneiss
The Archean gneiss complex of the Saglek Block of Labrador is a part of the North Atlantic Craton, and is correlated with southern West Greenland, both being metamorphosed during a ca. 2.7 Ga event. The main c...
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Open AccessNitrate and ammonium fluxes to diatoms and dinoflagellates at a single cell level in mixed field communities in the sea
Growth of large phytoplankton is considered to be diffusion limited at low nutrient concentrations, yet their constraints and contributions to carbon (C) and nitrogen fluxes in field plankton communities are p...
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Open AccessTurbulence simultaneously stimulates small- and large-scale CO2 sequestration by chain-forming diatoms in the sea
Chain-forming diatoms are key CO2-fixing organisms in the ocean. Under turbulent conditions they form fast-sinking aggregates that are exported from the upper sunlit ocean to the ocean interior. A decade-old para...
