J. M. Koornneef

J. M. Koornneef
Vrije Universiteit Amsterdam | VU · Department of Earth Sciences

BSc, MSc, PhD

About

66
Publications
12,392
Reads
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815
Citations
Additional affiliations
January 2016 - present
Vrije Universiteit Amsterdam
Position
  • Professor
April 2011 - December 2015
Vrije Universiteit Amsterdam
Position
  • PostDoc Position
April 2007 - November 2010
ETH Zurich
Position
  • PhD

Publications

Publications (66)
Article
Full-text available
Dense and strong, hydrothermal-metasomatic jadeitite and jadeite-omphacite rocks were used as tools and adornments throughout the wider Caribbean since initial inhabitation. Regionally, rich sources of jadeitite and jadeite-omphacite jade are known only in Guatemala (north and south of the Motagua Fault Zone), eastern Cuba and the northern Dominica...
Conference Paper
Full-text available
With the development of new analytical techniques the study of olivine-hosted melt inclusions (MI) becomes a more valuable and demanded method to collect geochemical information of primary mantle-derived melts. While a decade ago analyses included major, trace and volatile elements, recently it became possible to measure radiogenic isotopes in prim...
Article
Full-text available
The Sm–Nd isotope systematics and geochemistry of eclogitic, websteritic and peridotitic garnet and clinopyroxene inclusions together with characteristics of their corresponding diamond hosts are presented for the Letlhakane mine, Botswana. These data are supplemented with new inclusion data from the nearby (20–30 km) Orapa and Damtshaa mines to ev...
Conference Paper
Full-text available
The young potassium-rich volcanic rocks of peninsular Italy are the products of a complex post-collisional geodynamic setting. These volcanic rocks exhibit extreme compositional variability in space and time, resulting from large variations in the subducted material in their mantle sources. The genetic relationships between distinct Italian magmati...
Article
Mineral-hosted melt inclusions have become an important source of information on magmatic processes. As the number of melt inclusion studies increases, so does the need to establish recommended practice guidelines for collecting and reporting melt inclusion data. These guidelines are intended to ensure certain quality criteria are met and to achiev...
Article
Constraining the formation age of individual diamonds from incorporated mineral inclusions and assessing the host diamonds’ geochemical characteristics allows determination of the complex history of diamond growth in the sub-continental lithospheric mantle (SCLM). It also provides the rare opportunity to study the evolution of the deep cycling of v...
Conference Paper
Full-text available
Italian high-K magmatism records contributions of subducted components such as carbonate or pelagic sediments to the mantle source. Magma carbon dioxide (CO2) concentrations in conjunction with abundances of other volatiles, trace elements and isotopes play an important role in the characterisation of such subducted components [1]. Melt inclusions...
Conference Paper
Full-text available
Precise analysis of 20xPb/204Pb ratios is challenging when the amount of Pb is limited by sample volume or elemental concentration. The current precision impedes meaningful analyses of analytes with sub-nanogram Pb contents, such as individual melt inclusions with typical diameters (<100 µm). Decreasing this lower limit whilst maintaining precision...
Conference Paper
Full-text available
The Mariana arc forms part of the 2500 km Izu–Bonin–Mariana arc system caused by westward subduction of the Pacific Plate beneath the Philippine Sea Plate over the last ~45 Myr. The magmatism produced in this comparatively simple arc setting records a moderate flux of fluids and sediments from the downgoing plate, however, the low MgO (<6 wt.%) of...
Conference Paper
Full-text available
Radiogenic isotope compositions of bulk lavas have been used for decades to infer the extent and length scale of mantle heterogeneity resulting from extraction of partial melts and subduction recycling processes. However, owing to melt mixing, fractional crystallisation, and assimilation, lavas do not reliably record the mantle compositional hetero...
Conference Paper
Full-text available
Kimberlites are the deepest melts that reach Earth's surface and, therefore, can provide unique insights into the composition and evolution of the convective mantle through time. Application of isotope geochemistry to trace the composition of kimberlite sources has thus far been hindered by the ubiquitous alteration and incorporation of xenocrystic...
Article
Full-text available
A micro‐invasive technique is presented that enables pigment sampling from individual layers of a painting cross section by obtaining a furrow 10‐50 μm wide of chosen length. Combined with increased sensitivity of lead isotope analysis using MC‐ICPMS equipped with a 1013 Ω resistor or a Pb double spike technique, the amount of Pb needed for isotopi...
Conference Paper
Full-text available
Radiogenic isotope signatures of mid-ocean ridge basalts (MORB) have been used for decades to map mantle composition, defining the depleted mantle end member. However, MORB homogenize via magma mixing prior to eruption and, hence, may not capture the full chemical variability of their mantle source. Here we show that substantial mantle heterogenity...
Conference Paper
Full-text available
Subduction of Earth’s surface material at convergent plate boundaries exerts fundamental control on global element fluxes that shape long-term planet evolution. However, the extent and mechanisms of subduction recycling remain ambiguous, especially in continental subduction zones where sediment input is highest. To resolve this issue, we examine th...
Conference Paper
Full-text available
Melt inclusions (MIs) in deeply formed magmatic minerals are typically characterised by larger variability in major and trace element- and isotope compositions compared to bulk lavas. The larger geochemical variability reflects that MIs represent partial melts that have escaped post-entrapment melt mixing that homogenises bulk lava compositions. Th...
Article
Full-text available
Recycling of Earth's crust through subduction and delamination contributes to mantle heterogeneity. Melt inclusions in early crystallised magmatic minerals record greater geochemical variability than host lavas and more fully reflect the heterogeneity of magma sources. To date, use of multiple isotope systems on small (< 300 μm) melt inclusions was...
Poster
Fancy colour diamonds sell for premium prices compared to colourless. However, the exact geological processes that lead to certain colour centres and related defect characteristics are not always well understood. Studies of unusual yellow diamonds have been successful in providing a better understanding of the geological context for the preservatio...
Conference Paper
Full-text available
The complex intercontinental collision zone of peninsular Italy is characterised by diverse potassium-rich magmatic products that reflect large temporal and spatial variations in subducted material in the mantle source. Understanding the chemical geodynamics of Italy—a post-collisional subduction setting marked by large sediment input—is key to dec...
Article
Full-text available
The Earth’s mantle is heterogeneous as a result of early planetary differentiation and subsequent crustal recycling during plate tectonics. Radiogenic isotope signatures of mid-ocean ridge basalts have been used for decades to map mantle composition, defining the depleted mantle endmember. These lavas, however, homogenize via magma mixing and may n...
Article
Full-text available
Human provenance studies employing isotopic analysis have become an essential tool in forensic and archaeological sciences, with multi-isotope approaches providing more specific location estimates compared to single isotope studies. This study reports on the human provenancing capability of neodymium isotopes ( ¹⁴³ Nd/ ¹⁴⁴ Nd), a relatively conserv...
Conference Paper
Variations in radiogenic isotopes in mid-ocean ridge basalts (MORB) are interpreted to reflect the presence of enriched and depleted mantle components in their source regions and have been used to infer the abundance and time scales of crustal recycling. However, MORB are homogenized via magma mixing prior to eruption and may not capture the full h...
Preprint
Human provenance studies employing isotope analysis are essential in archaeological and forensic sciences but current applications provide limited spatial resolution. This study reports on the potential of neodymium isotope composition (143Nd/144Nd) to improve human provenancing capabilities. Human tissues contain very low (<0.1 ppm) neodymium conc...
Article
Full-text available
The scale and magnitude of compositional heterogeneity in the mantle has important implications for the understanding of the evolution of Earth. Heterogeneity of the upper mantle is often evaluated based on mid-ocean ridge basalt compositions, despite their homogenisation prior to eruption. In this study we present Nd and Sr isotope data obtained b...
Conference Paper
Full-text available
The diamondiferous Jwaneng kimberlite cluster (~240 Ma) is located on the NW rim of the Archaean Kaapvaal Craton in central Botswana. Previous studies report eclogitic diamond formation in the late Archean (2.9 Ga) and in the Middle Proterozoic (1.5 Ga) involving different mantle and sedimentary components [1;2;3]. Here we report newly acquired Sm-...
Article
Geochemical investigations of mantle heterogeneity as sampled by ocean island basalts (OIB) have long relied on isotopic analyses of whole rock lavas. However recent work has shown that significant isotopic disequilibrium can exist between the phases (groundmass and phenocrysts) of a single OIB lava. In this study, we target individual olivine-host...
Conference Paper
Full-text available
Changing recycling budgets of surface materials and volatiles by subduction of tectonic plates influence the compositions of Earth's major reservoirs and affect climate throughout geological time. Fluids play a key role in processes governing subduction recycling, but quantifying the exact fate of volatiles introduced into the mantle at ancient and...
Article
Human provenance studies employing isotope analysis are essential in archaeological and forensic sciences but current applications provide limited spatial resolution. This study reports on the potential of neodymium isotope composition (¹⁴³Nd/¹⁴⁴Nd) to improve human provenancing capabilities. Human tissues contain very low (<0.1 ppm) neodymium conc...
Article
Full-text available
Precise dating of diamond growth is required to understand the interior workings of the early Earth and the deep carbon cycle. Here we report Sm-Nd isotope data from 26 individual garnet inclusions from 26 harzburgitic diamonds from Venetia, South Africa. Garnet inclusions and host diamonds comprise two compositional suites formed under markedly di...
Article
Full-text available
A new integrated trace element and multi-isotope provenancing methodology is presented that uses a portable “non-invasive” pulsed laser ablation sampling technique. Samples are collected on location onto teflon filters for return to a clean laboratory for low blank (pg) geochemical procedures. Ablation pits approximately 60 or 120 μm in width and d...
Article
We have produced a record of radiogenic isotope compositions of particulate and soluble dust fractions from the GISP2 ice core, from basal ice to the surface. For each respective dust fraction we measured Sr and Nd isotope values to constrain the provenance of mineral dust and sea salt aerosol transported to the Greenland Ice Sheet. We have produce...
Conference Paper
Full-text available
The diamondiferous Letlhakane kimberlites are part of the Orapa kimberlite cluster (∼ 93.1 Ma) in northeastern Botswana, located on the edge of the Zimbabwe Craton, close to the Proterozoic Magondi Mobile Belt. Here we report the first Re-Os ages of six individual eclogitic sulphide inclusions (3.0 to 35.7µg) from Letlhakane diamonds along with the...
Article
Monocrystalline diamonds commonly record complex internal structures reflecting episodic growth linked to changing carbon-bearing fluids in the mantle. Using diamonds to trace the evolution of the deep carbon cycle therefore requires dating of individual diamond growth zones. To this end Rb–Sr and Sm–Nd isotope data are presented from individual ec...
Conference Paper
Full-text available
The diamondiferous Venetia Kimberlite cluster (~520 Ma) is located in the core of the Limpopo Mobile Belt, a zone of compression between the Kaapvaal and the Zimbabwe Cratons. Diamond formation beneath Venetia is likely related to major craton evolution events that led to the current regional tectonic makeup. Here we report the first Sm-Nd ages of...
Article
Investigations of mantle heterogeneity in ocean island basalts (OIB) frequently compare heavy radiogenic isotopes (i.e. 87Sr/86Sr), often measured in whole rock powders, with 3He/4He and δ18O, commonly measured in olivines. However, the 87Sr/86Sr in the olivines, which is dominated by Sr in melt inclusions, may not be in equilibrium with the 87Sr/8...
Article
Recent declines in ice shelf and sea ice extent experienced in polar regions highlight the importance of evaluating variations in local weather patterns in response to climate change. Airborne mineral particles (dust) transported through the atmosphere and deposited on ice sheets and glaciers in Antarctica and Greenland can provide a robust set of...
Conference Paper
Determining temporal variations in the nature and timing of diamond formation is an important step in understanding the workings of the Earth's deep carbon cycle. To this end we report the first successful TIMS Sm-Nd dating study of extremely small (2-110 µg) individual silicate inclusions from diamonds. The Nd and Sm isotope ratios were analysed u...
Article
The use of the double spike technique to correct for instrumental mass fractionation has yielded high precision results for lead isotope measurements by thermal ionisation mass spectrometry (TIMS), but the applicability to ng size Pb samples is hampered by the small size of the 204Pb ion beam in the natural isotope composition analysis. To overcome...
Poster
Full-text available
A multi-isotopic and trace elemental approach to provenance Caribbean greenstone artefacts in an essentially non-destructive way: Implications for pre- and post-colonial exchange and mobility networks 1Knaf, A.C.S., 1Koornneef, J.M., 2Hofman, C.L., 1Davies, G.R. 1Faculty of Earth and Life Sciences, Deep Earth and Planetary Science Cluster, Free U...
Conference Paper
Throughout the circum Caribbean in pre-colonial times, so called “greenstones” were used to manufacture a wide range of artefacts, including figurines, spiritual items and jewellery, as well as more utilitarian objects like axes. Whilst the metamorphic complexes serving as raw materials have restricted occurrences (Schertl et al., 2012), the greens...
Conference Paper
Full-text available
Melt inclusions record more extreme isotopic variability than their bulk host lavas and offer the potential to better constrain mantle components that contribute to magmatism. Isotopic analyses of melt inclusions are, however, challenging because of their limited size. To date, Sr and Pb isotope data have been obtained for oceanic islands by applic...
Conference Paper
Full-text available
This research addresses the immediate and lasting effects of the colonial encounters on indigenous Caribbean cultures and societies to determine the intercultural dynamics that took place during and after the arrival of Columbus in 1492. To achieve these goals, changes in space and time of the circulation of materials and artifacts need to be quant...
Conference Paper
A long term (5 year) systematic integrated geochronological, stable isotope and diamond morphology and diamond composition study is being undertaken on representative diamonds sampled from run of mine production from 4 Botswanan mines: Letlhakane, Jwaneng, Damtshaa and Orapa. The overall goal is to determine the nature and number of diamond forming...
Article
We tested 5 newly manufactured – prototype – 1013 Ohm resistors in the feedback loop of Faraday cup amplifiers to measure small ion beams by Thermal Ionisation Mass Spectrometry (TIMS). The high Ohmic resistors installed in the TRITON Plus at the VU University Amsterdam theoretically have 10 times lower noise levels relative to the default 1011 Ohm...
Article
Full-text available
We have investigated the use of current amplifiers equipped with 1012 ohm feedback resistors in thermal ionisation mass spectrometry (TIMS) analyses of sub-nanogram sample aliquots for Nd and Sr isotope ratios. The results of analyses using the 1012 ohm resistors were compared to those obtained with the conventional 1011 ohm amplifiers. We adopted...
Article
The potential of femtosecond laser ablation multi-collector inductively coupled plasma mass spectrometry (fs-LA-MC-ICPMS) for in situ analysis of U–Th disequilibria in titanite was investigated. The aim of the study was to resolve spatial variations in (230Th/238U) ratios (where parentheses denote activity) in titanite from slowly cooled magma bodi...
Article
We investigate the relative influence of mantle upwelling velocity and source heterogeneity on the melting rates recorded by 230Th–238U, 231Pa–235U and 226Ra–230Th disequilibria in post-glacial tholeiites from Iceland’s main rift areas. The measured (230Th/238U) ratios range from 1.085 to 1.247, the (231Pa/235U) ratios from 1.333 to 1.925, and the...
Article
Full-text available
New trace element and Hf-Nd isotope data on post-glacial basalts from Iceland's main rift zones are used in conjunction with literature data to evaluate the relative importance of source heterogeneity and the melting process for the final melt composition. Correlations between Hf and Nd isotope compositions and trace element ratios indicate that at...
Article
U-series disequilibria provide important constraints on the processes and time scales of melt production, differentiation, and transport in subduction settings. Such constraints, which are essential for understanding the chemical evolution of the continental crust, are conventionally based on the assumption that the U-series disequilibria measured...
Article
U-series disequilibria provide important constraints on the processes and time scales of melt production, differentiation, and transport in subduction settings. Such constraints, that are essential for understanding the chemical evolution of the continental crust, are conventionally based on the assumption that the U-series disequilibria measured i...
Article
A new method for the chemical separation and MC-ICPMS measurements of U–Th–Pa–Ra disequilibria in volcanic samples from a single sample aliquot is presented. The accuracy and precision of our techniques is assessed by replicate analyses of the synthetic U and Th isotope standards IRMM-184 and IRMM-35, and the secular equilibrium rock standards BCR-...
Article
Petrography, mineral major- and trace element analyses and Rb–Sr and Sm–Nd systematics of xenoliths from Labait volcano, north-central Tanzania, document multiple metasomatic events after initial depletion of the Archaean sub-lithospheric mantle. Four distinct metasomatic phases occurred during the 2.8–3.2 Ga history of the mantle section of the Ta...
Article
The radial decrease in excess temperature (ΔT) away from the Iceland plume axis should cause a systematic decrease in degree and depth of partial melting. La/Sm and δ(Sm/Nd), and La,Sm/Yb and δ(Lu/Hf)ratios in post-glacial basalts from Iceland rift zone, however, do not vary systematically with progressive distance to the plume center. Despite stro...
Article
Full-text available
This paper reviews the problems encountered in eleven studies of Sr isotope analysis using laser ablation multicollector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) in the period 1995-2006. This technique has been shown to have great potential, but the accuracy and precision are limited by: (1) large instrumental mass discrimination,...

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Projects

Projects (6)
Project
We perform high-P & high-T experiments for complete homogenisation of high-Fo olivine-trapped melt inclusions. The experiments conduct in a piston cylinder press (VU, Amsterdam), with accurate control of T, P, fO2 and rapid quenching of the homogenised MI. We aim to quantify the initial CO2 and H2O content in fully homogenised MI.
Project
Sr-Nd-Pb Isotopes in melt Inclusions trapped in high-Fo olivine in magmas from different geodynamic settings