A5051183650- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Geological Studies and Exploration
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Geomagnetism and Paleomagnetism Studies
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Isotope Analysis in Ecology
- X-ray Spectroscopy and Fluorescence Analysis
- Geological Formations and Processes Exploration
- Marine and environmental studies
- Pleistocene-Era Hominins and Archaeology
- Analytical chemistry methods development
- Cultural Heritage Materials Analysis
Norwegian Geological Survey
2020-2023
Aarhus University
2017-2023
Vrije Universiteit Amsterdam
2023
University of Plymouth
2021
University of California, Santa Barbara
2015-2017
Carleton College
2016
Abstract The origin of Large Igneous Provinces (LIPs) associated with continental breakup and the reconstruction continents older than ca. 320 million years (pre‐Pangea) are contentious research problems. Here we study petrology a 615–590 Ma dolerite dyke complex that intruded rift basins magma‐rich margin Baltica now is exposed in Scandinavian Caledonides. These dykes part Central Iapetus Magmatic Province (CIMP), LIP emplaced Laurentia during opening Caledonian Wilson Cycle....
Rare earth element (REE) ore-bearing carbonatite dikes and a stock at Mountain Pass, California, are spatially associated with suite of ultrapotassic plutonic rocks, it has been proposed that the two genetically related. This hypothesis is problematic, given existing geochronological constraints indicate ∼15–25 Myr younger than requiring alternative models for formation REE during separate event and/or via different mechanism. New laser ablation split-stream inductively coupled plasma mass...
Laser ablation multi‐collector mass spectrometry (LA‐MC‐ICP‐MS) has emerged as the technique of choice for in situ measurements Sr isotopes geological minerals. However, method poses analytical challenges and there is no widely adopted standardised approach to collecting these data or correcting numerous potential isobaric inferences. Here, we outline practical procedures reduction strategies help establish a consistent framework isotope materials by LA‐MC‐ICP‐MS. We characterise new set...
Abstract The Ross orogen of Antarctica is an extensive (>3000 km‐long) belt deformed and metamorphosed sedimentary rocks granitoid batholiths, which formed during convergence subduction palaeo‐Pacific lithosphere beneath East Gondwana in the Neoproterozoic–early Palaeozoic. Despite its prominent role Gondwanan convergent tectonics, a well‐established magmatic record, relatively little known about metamorphic orogen. A combination garnet Lu–Hf monazite U–Pb (measured by laser‐ablation...
Granitoids associated with the Neoproterozoic–early Paleozoic Ross orogeny are extensively exposed in Dry Valleys region of southern Victoria Land, Antarctica, affording an exceptional opportunity to gain insight into temporal and spatial scales continental arc magmatism. Samples spanning 150 km along strike 50 across were selected for isotopic geochemical analysis. Zircon U-Pb geochronology first Hf isotope data granitoids, coupled whole-rock elemental data, reveal mixing between enriched...
Research Article| February 26, 2019 Strontium isotope systematics for plagioclase of the Skaergaard intrusion (East Greenland): A window to crustal assimilation, differentiation, and magma dynamics Graham Hagen-Peter; Hagen-Peter 1The Centre Earth System Petrology Aarhus Geochemistry Isotope (AGiR) Platform, Department Geoscience, University, Høegh-Guldbergs Gade 2, 8000 C, Denmark Search other works by this author on: GSW Google Scholar Christian Tegner; Tegner Charles E. Lesher...
Abstract Phosphate rocks and rare earth elements (REEs) as potential by-products are listed Critical Raw Materials (CRMs) by the European Commission. In Europe, igneous-related phosphate deposits associated with carbonatites, alkaline complexes, (ultra)mafic intrusions, iron oxide–apatite (IOA) oxide–copper–gold (IOCG) mineralization, granites or formed in a metasomatic/hydrothermal context. To provide an overview of these assess their CRMs, database gathering situ analyses apatite was...
Carbonate rocks are important paleo-environmental records, with bulk chemical and isotopic compositions commonly used to deduce temperatures, redox conditions, etc. Diagenetic (re)crystallization of clasts cements is common, may perturb the systems typically interpreted reflect conditions at timing deposition, occur essentially synchronous or long after difficult date. Advances in situ carbonate trace-element mapping U–Pb dating by LA-ICP-MS provide opportunities determine absolute...
Magmatism between 1.3 and 0.9 Ga at the southwestern margin of Fennoscandia, comprising mainly granitic batholiths subordinate bimodal volcanic rocks, provides a nearly continuous magmatic record Fennoscandian tectonic evolution. Here, we present new published zircon Hf, K-feldspar Pb whole-rock Sr isotopic data from rocks. The εHf evolution since 1300 Ma starts out as relatively juvenile, with flat superchondritic trend 1300–1130 followed by steeper towards lower, but still values 1070–1010...
Laser ablation multi-collector mass spectrometry (LA-MC-ICP-MS) has emerged as the technique of choice for in situ measurements Sr isotopes geological minerals. However, method poses analytical challenges and there is no widely adopted standardised approach to collecting these data or correcting numerous potential isobaric inferences. Here, we outline practical procedures reduction strategies help establish a consistent framework isotope materials by LA-MC-ICP-MS. We characterise new set...