A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2021; you can also visit the original URL.
The file type is
The open-access Rocklea Dome 3D Mineral Mapping Test Data Set (Laukamp, 2020; https://doi.org/10.25919/5ed83bf55be6a) provides an opportunity for evaluating proximal and remote sensing data, validated ... et al., 2010 Laukamp et al., , 2021 , for more details). ... Data availability The data discussed in this article are available online at: https://doi.org/10.25919/5ed83bf55be6a (Laukamp, 2020) . ...doi:10.5194/essd-13-1371-2021 fatcat:7isxdeaf3jgxnhvf46gk6j2stq
We want to thank especially Sanaz Salati and Carsten Laukamp for the collaboration and support during the preparation of the study and the comments on the draft. ... Laukamp reviewed and edited the manuscript. C. Laukamp provided the remote sensing data and helped with logistical support. Fieldwork was conducted by S. Jakob and R. Gloaguen in 2014. R. ...  , Laukamp et al.  and Laukamp et al.  to investigate alteration zones and patterns within the Mount Isa Inlier. In Perera et al. ...doi:10.3390/rs8050358 fatcat:fgo76yqg6rhixn2nr3n62o3dzq
The efficacy of predicting geochemical parameters with a 2-chain workflow using spectral data as the initial input is evaluated. Spectral measurements spanning the approximate 400–25000 nm spectral range are used to train a workflow consisting of a non-negative matrix function (NMF) step, for data reduction, and a random forest regression (RFR) to predict eight geochemical parameters. Approximately 175,000 spectra with their corresponding chemical analysis were available for training, testingdoi:10.3390/app12010282 fatcat:xbvzrbylgfebvgygwrnxy47e7e
more »... d validation purposes. The samples and their spectral and chemical parameters represent 9399 drillcore. Of those, approximately 20,000 spectra and their accompanying analysis were used for training and 5000 for model validation. The remaining pairwise data (150,000 samples) were used for testing of the method. The data are distributed over two large spatial extents (980 km2 and 3025 km2, respectively) and allowed the proposed method to be tested against samples that are spatially distant from the initial training points. Global R2 scores and wt.% RMSE on the 150,000 validation samples are Fe (0.95/3.01), SiO2 (0.96/3.77), Al2O3 (0.92/1.27), TiO (0.68/0.13), CaO (0.89/0.41), MgO (0.87/0.35), K2O (0.65/0.21) and LOI (0.90/1.14), given as Parameter (R2/RMSE), and demonstrate that the proposed method is capable of predicting the eight parameters and is stable enough, in the environment tested, to extend beyond the training sets initial spatial location.
A workflow incorporating hyperspectral reflectance data, hull corrections, absorption feature extraction and clustering is presented. The workflow is applied to dense hyperspectral datasets, as collected by hyperspectral drill core logging systems. The extracted absorption features of the reflectance spectra collected from drill cores are shown to form assemblage clusters when plotting the wavelength position of the first, second and third deepest absorption features in two and threedoi:10.3390/min11020136 fatcat:ir4setjutjb6nnww47yyx7fgbm
more »... Using an unsupervised clustering method to establish clusters based on the extracted absorption features yields viewable down hole distributions of similar mineral assemblages. The proposed workflow has the potential for the rapid identification of differing lithologies, alteration and/or weathering overprints. Application of the workflow with no a-priori assumptions about the composition of the potential mineral assemblages provides a means of generating an informative overview of the dataset that is not biased or constrained by preconceptions. The workflow can easily be added to the current workflows of geologists whom are working with dense hyperspectral data to provide an overview of the potential down hole mineral assemblages and aid in the visual logging process or assist in quickly identifying areas for more detailed observation. Furthermore, key mineralogical parameters for resource characterisation, such as the presence of clay minerals can be assessed in a cost and time efficient manner. The proposed workflow is applied to spectra collected from four different drill cores collected in the Gawler Craton located in South Australia and demonstrates the potential outlined above.
Acknowledgments: First and foremost, Carsten Laukamp would like to thank Tom Cudahy (C3DMM), who inspired this work. ... Laukamp et al. ... Using coarse reject sample material, Laukamp et al. ...doi:10.3390/min11040347 fatcat:joveqgwxvnhrrjvuao2xuzschm
The Earth's surface comprises minerals diagnostic of weathering, deposition and erosion. The first continental-scale mineral maps generated from an imaging satellite with spectral bands designed to measure clays, quartz and other minerals were released in 2012 for Australia. Here we show how these satellite mineral maps improve our understanding of weathering, erosional and depositional processes in the context of changing weather, climate and tectonics. The clay composition map shows howdoi:10.1038/srep23702 pmid:27025192 pmcid:PMC4812253 fatcat:zpoqpcb76bbpxcsivqx7gltjrm
more »... ite has developed over tectonically stable continental crust in response to deep weathering during northwardly migrating tropical conditions from 45 to 10 Ma. The same clay composition map, in combination with one sensitive to water content, enables the discrimination of illite from montmorillonite clays that typically develop in large depositional environments over thin (sinking) continental crust such as the Lake Eyre Basin. Cutting across these clay patterns are sandy deserts that developed <10 Ma and are well mapped using another satellite product sensitive to the particle size of silicate minerals. This product can also be used to measure temporal gains/losses of surface clay caused by periodic wind erosion (dust) and rainfall inundation (flood) events. The accuracy and information content of these satellite mineral maps are validated using published data. The Earth's regolith comprises all surface materials between "fresh rock and fresh air" where oxidation, hydration, biological and mechanical processes have caused some degree of mineralogical change (weathering) and porosity generation of underlying rock 1,2 . Parent rock, tectonics, climate, landform, groundwater, vegetative groundcover and time all contribute to the composition and architecture of the regolith 3 . Progressive weathering is generally associated with increased development of volatiles yielding minerals like hydroxyl-bearing clays (for example, illite, montmorillonite and kaolinite) as well as decreased levels of mobile cations (e.g. Ca, Mg, K and Na) as a consequence of hydrological leaching 3-6 . O)] × 100; where CaO* is the amount of CaO incorporated in silicate minerals}. The CIA was designed to estimate the amount and composition of clay minerals based on the assumption that kaolin [Al 2 Si 2 O 5 (OH) 4 ] is associated with intense weathering that is typical of warmer, wetter conditions, such as the subtropical monsoonal belt. In contrast, illite [(K,H 3 O)(Al,Mg,Fe) 2 (Si,Al) 4 O 10 [(OH) 2 ·(H 2 O)] and montmorillonite [(Na,Ca) 0.33 (Al,Mg) 2 (Si 4 O 10 )(OH) 2 ·nH 2 O] are indicative of less intense weathering typical of cooler, temperate conditions 5,6,8 . Not included in the CIA is silicon (Si) which is abundant in the Australian regolith 4 as quartz (SiO 2 ). Quartz grains are generally equant in shape and large in diameter (> 20 μm but < 2000 μm; called "sand size") and so are less vulnerable to erosion by wind 9 compared with clay minerals, which typically have a finer grain size (< 2 μm; called "clay size") and platy habit. Australia is a flat, dry, deeply weathered continent reflecting its low rates of erosion and long-lived tectonic stability associated with its mosaic of Precambrian blocks 1 . Approximately 80% of Australia is covered by a thick blanket of regolith that largely comprises clays, iron oxides and quartz 1,4 . This deep weathering began from at least 45 Ma where tropical conditions extended down to a latitude 30° south. From 10 Ma this monsoonal belt began to move northward exposing Australia's inland regions to increasingly arid conditions and resulting in the formation of extensive deserts 10 . Sandy dune-fields like the Simpson Desert result from the preferential loss of surface clay materials by wind erosion. Today, Australia's drylands (rainfall/evaporation < 0.65) generate the largest source of dust in the southern hemisphere contributing 5-15% of the global dust emissions 11 . This dust is potentially impacting on human health 12 , the sustainability of agricultural soils 13-15 , episodic oceanic algal blooming 16 and atmospheric aerosol scattering and climate change 17,18 . Airborne geophysical methods like gamma-ray spectrometry 19 are currently used in Australia to measure clay information 20 and map the regolith 21 . Reflectance/emission spectroscopy using field, airborne and spaceborne systems can also provide information about clays, quartz and particle size 22-27 . There have been more than two hundred Earth observation (EO) reflectance/emission satellite missions though only one of these EO sensors to date was designed specifically and operated successfully for global mapping of mineral information, namely ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) 28 . This Japanese-US system was launched in December 1999 as part of a multi-sensor payload onboard the USA's Terra space platform for servicing NASA's Mission to Planet Earth, now called Earth Science Enterprise 29 . ASTER is a polar orbiting (<83° latitude) system with a 60 km imaging swath designed to sense across fourteen spectral bands at a pixel resolution between 15 and 90 m. These spectral bands include: (a) three in the visible and near infrared (VNIR, 0.4 to 1 μm) wavelength region where green vegetation and iron oxides have diagnostic spectral features; (b) six in the shortwave infrared (SWIR, 1-2.5 μm), where clay minerals have diagnostic features related to the vibration of hydroxyl groups; and (c) five in the thermal infrared (TIR, (8) (9) (10) (11) (12) , where non-hydroxyl bearing silicate minerals like quartz have diagnostic features though particle size also has a pronounced effect 24 . The ASTER global land surface mapping program is into its sixth iteration, though the SWIR module failed permanently in 2008. The first public, continent-wide ASTER mineral mosaics were generated for Australia in 2012 30,31 using 3500 satellite images collected between 2000 and 2007. This paper focuses on three of the available seventeen published ASTER geoscience maps 30 plus introduces a new one designed for measuring water content and/or particle size (see Methods). These four ASTER SWIR and TIR mineral products focus on clay, water, quartz and particle size information and are validated using published field sample data as well as meteorological, geophysical and other satellite data. Their value for mapping and monitoring the effects of weathering, erosion and deposition in the context of variable vegetation cover, climate and tectonic processes is assessed before a final perspective on the future of mineral mapping and monitoring of the Earth using integrated (VNIR-) SWIR-TIR imaging systems is outlined.
The following outline of the tectonic evolution of the OML is taken mainly from Laukamp et al. (2006) . ... Laukamp et al. (2006) emphasised the possible role of shear zones as seals for ascending metal-bearing fluids. ... Heidelberg, den 01.12.2006 Hiermit erkläre ich, Carsten Laukamp (geb. 15.02.1974 ...doi:10.11588/heidok.00007225 fatcat:horcuipz6jabnh4wmnsqjnwvzq
Structural control of fluid flow on a carbonate platform margin: an example from the Otavi Mountainland, Namibia Vortrag Carsten Laukamp 1 Volker Petzel 2 Thilo Bechstädt 1 Fault inversion and alteration ...doi:10.23689/fidgeo-1849 fatcat:udt7stn56bgw7ghdy7vd6f4xla
Eo-Alpine imbrication of Middle Austroalpine units in the Gurktal Alps, Carinthia -questioning the existence of the Upper Austroalpine Murau Nappe Poster Carsten Laukamp 1 Thomas Angerer 1 Structural analysis ...doi:10.23689/fidgeo-1832 fatcat:bu35fkd3dbemfcaw5xurfeghpm
Lamberti, Luciano Lanci, Luca Lane, Emily Langhi, Laurent Laukamp, Carsten Lawrence, John R. ...doi:10.3390/geosciences8010033 fatcat:acox4lxy3bdcvozlmow5ebjfei
Die Geschichte der Staatsanwaltschaft in Deutschland bis zur Gegenwart
Für die kritische Durchsicht des Textes danke ich der früheren Oberstaatsanwältin und späteren Innensenatorin der Hansestadt Lübeck Dagmar Pohl-Laukamp, Staatsanwalt i.R. ... Paul Carsten und dessen Frau Frida -sowie seinen Geschwistern -Marie Emilie Carsten und Franz Ludwig Carsten -aus Deutschland, während der Bruder seiner Mutter, Richard Born, am 21. ...doi:10.5771/9783845268569-1 fatcat:23ro7irrr5carfco2xhk324ree
Eva Julia Laukamp for "Immediate release carbamazepine formulation for individually dosing by the solid dosage pen" and Ms. Sejal Ranmal. ... Carsten Timpe (Roche). An overview about extemporaneous preparations for children along with a case study of oseltamivir phosphate (Tamiflu) was presented. ...doi:10.1016/j.ijpharm.2014.04.037 pmid:24746692 fatcat:uc3r4tcmongffexe3il77vfgii
Lasaponara, Rosa Lasky, Ty Lattanzio, Alessio Laukamp, Carsten Laurent, Valérie C.E. Laurila, Heikki Laurin, Gaia Vaglio Lausch, Angela Lavalle, Marco Lawrence, William T. ...doi:10.3390/rs70100627 fatcat:shjrih5jvjechkiyisrttr3p5u
Carsten Laukamp (now in Australia) , for introducing me to the Otavi Mountainland geology and for sharing with me both extraordinary field experiences in Namibia (2004) and Zambia (2006) , as well ... Geologically, the OML consists of a (Laukamp, 2006) . ...doi:10.6092/unina/fedoa/3356 fatcat:naa5rhx3wjf5vc5fjlnajz25fm
Carsten Laukamp (CSIRO Perth) and Paul Duuring (GSWA) are thanked for advice on hyperspectral data interpretations. ...doi:10.1002/2017tc004696 fatcat:v4ex3jtl6nejndmbuuygqdzr7a
« Previous Showing results 1 — 15 out of 21 results