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critical zones

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Journal Article
Published: 01 February 2015
Geochemistry: Exploration, Environment, Analysis (2015) 15 (1): 39-53.
... mineralization within a gabbroic rock body was discovered. This paper reports the results of our study. However, the topographic slope of the ν 1 intrusive body tilts towards the NW, and thus the most anomalous soil Pt and Pd concentrations may be somewhat transferred from the contact zone along...
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Journal Article
Journal: Economic Geology
Published: 01 August 1986
Economic Geology (1986) 81 (5): 1087-1095.
...C. A. Lee; M. Tredoux Abstract Forty whole-rock samples representing the principal silicate rock types of the lower and the lower critical zones of the Bushveld Complex were analyzed for Ir, Ru, Rh, Pt, Pd, and Au. Ir concentration ranges from 0.1 to 2.2 ppb, with sporadic values greater than 4 ppb...
Journal Article
Journal: Economic Geology
Published: 01 July 1985
Economic Geology (1985) 80 (4): 872-895.
...L. J. Hulbert; Gerhard Von Gruenewaldt Abstract Chromite is developed as an accessory mineral in a 1,700-m-thick sequence of lower and lower critical zone cumulates in the area south of Potgietersrus and as a major constituent in a number of chromitite layers within this sequence. The lower zone...
Journal Article
Journal: Elements
Published: 01 October 2007
Elements (2007) 3 (5): 321-326.
...Jon Chorover; Ruben Kretzschmar; Ferran Garcia-Pichel; Donald L. Sparks Abstract Many processes that affect soil and water quality occur at the water-wetted interface of weathering products such as clays, oxides, and organic matter. Especially near the sunlit surface of the Critical Zone...
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Simplified stratigraphy of the upper <b>Critical</b> <b>Zone</b> and lower Main <b>Zone</b>, sho...
Published: 01 September 2018
Figure 2. Simplified stratigraphy of the upper Critical Zone and lower Main Zone, showing the locations of samples, many being from the open pit. Abbreviations: MG4, UG1, UG2, MR and BR – Middle Group 4 chromitite, Upper Group 1 and 2 chromitites, Merensky and Bastard Reefs.
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Columnar sections of the Lower Main <b>Zone</b> – Upper <b>Critical</b> <b>Zone</b> and Merensky...
Published: 01 December 2007
Figure 4. Columnar sections of the Lower Main Zone – Upper Critical Zone and Merensky Reef – UG 2 intersections on Kliprivier (see Figure 2 for location of profiles).
Journal Article
Journal: Economic Geology
Published: 01 September 2005
Economic Geology (2005) 100 (6): 1191-1206.
...Charlie L. Seabrook; R. Grant Cawthorn; F. Johan Kruger Abstract A major geochemical hiatus occurs in the Bushveld Complex at the level of the platiniferous Merensky reef, close to the Critical-Main zone boundary. The origin of this hiatus and its relationship to mineralization has not been fully...
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Stratigraphic column of the upper part of the Upper <b>Critical</b> <b>Zone</b> in boreho...
Published: 07 May 2019
Figure 3. Stratigraphic column of the upper part of the Upper Critical Zone in borehole WE037. Chromitite layers, designated in red to the right of the plot, are the UG1 chromitite layers (UG1); the UG2 chromitite layers (UG2); the chromite stringer at the top of the Lower Pseudo Reef (LPR
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Zircon ages and weighted means from the <b>Critical</b> <b>Zone</b> to the lower Main Zon...
Published: 01 December 2017
Figure 7. Zircon ages and weighted means from the Critical Zone to the lower Main Zone of the Bushveld Complex. The individual zircon 207 Pb/ 2 06 Pb dates of Mungall et al. (2016) (red diamonds) are compared with those from Zeh et al. (2015) (blue triangles) in the same or adjacent units
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A global network of <b>Critical</b> <b>Zone</b> Observatories (CZOs) and CZO-like sites. ...
Published: 01 September 2016
Fig. 1. A global network of Critical Zone Observatories (CZOs) and CZO-like sites. Red dots indicate the US national CZOs ( http://criticalzone.org/national/ ), including Boulder Creek CZO, Calhoun CZO, Catalina/Jemez CZO, Christina CZO, Eel CZO, IML CZO, Luquillo CZO, Reynolds Creek CZO, Shale
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A total of 133 <b>Critical</b> <b>Zone</b> (CZ) related studies have been published in  V...
Published: 01 September 2016
Fig. 2. A total of 133 Critical Zone (CZ) related studies have been published in Vadose Zone Journal and another 91 in other scientific journals from 2011 to 2015 based on the ISI Web of Knowledge core database (as of 22 May 2016). These 133 papers include 106 published in seven special
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Cartoon showing controls on supergene mineralization in the “<b>Critical</b> <b>Zone</b>”...
in > Elements
Published: 01 October 2015
F igure 1 Cartoon showing controls on supergene mineralization in the “Critical Zone” where the biosphere, atmosphere, lithosphere, pedosphere (soil), and hydrosphere intersect. Orecretes are the mineralized deposits left behind from the supergene alteration of primary ore bodies or deposits
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<b>Critical</b> <b>Zone</b> Observatory (CZO) map displaying (a) location, CZO catchments...
Published: 01 August 2015
Fig. 1. Critical Zone Observatory (CZO) map displaying (a) location, CZO catchments, and instrument and sensor clusters with 10-m elevation contours and (b) upper meteorological station and (c) lower meteorological station sensor locations with 2-m elevation contours. Background of (b) and (c
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<b>Critical</b> <b>zone</b> services provide context, constraints, and currency that enab...
Published: 01 January 2015
Fig. 1. Critical zone services provide context, constraints, and currency that enable more effective management and valuation of ecosystem services (adapted from MEA, 2005 ).
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Location map of the Kervidy-Naizin <b>critical</b> <b>zone</b> observatory (Brittany, Fra...
Published: 01 July 2014
Fig. 1. Location map of the Kervidy-Naizin critical zone observatory (Brittany, France). Gray areas located along the channel network indicate the maximum extent of the wetland zones.
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Topographic map of Susquehanna-Shale Hills <b>Critical</b> <b>Zone</b> Observatory (SSHCZ...
Published: 01 November 2013
Fig. 1. Topographic map of Susquehanna-Shale Hills Critical Zone Observatory (SSHCZO) with stable isotope monitoring instruments. Colors indicate soil type based on field observations ( Lin et al., 2006 ). Ten-minute precipitation amounts and event-based water samples were collected at the ridge
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A global network of <b>Critical</b> <b>Zone</b> Observatories (CZOs): 1. Southern Sierra ...
Published: 01 August 2011
Fig. 1. A global network of Critical Zone Observatories (CZOs): 1. Southern Sierra CZO in California; 2. Boulder Creek CZO in Colorado; 3. Shale Hills CZO in Pennsylvania; 4. Jemez– Catalina CZO in Arizona and New Mexico; 5. Christina River CZO in Delaware and Pennsylvania; 6. Luquillo CZO
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<b>Critical</b> <b>Zone</b> Observatory (CZO) map: (a) location, CZO catchments, instrume...
Published: 01 August 2011
Fig. 1. Critical Zone Observatory (CZO) map: (a) location, CZO catchments, instrument and sensor locations with 10-m elevation contours, (b) upper meteorological station, and (c) lower meteorological station sensor locations with 2-m elevation contours. Background of (b) and (c) is aerial photo.
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Map of the Shale Hills <b>Critical</b> <b>Zone</b> Observatory and the location of soil m...
Published: 01 August 2011
Fig. 1. Map of the Shale Hills Critical Zone Observatory and the location of soil moisture monitoring sites used in this study. The gray scale is the logarithm of the upslope contributing area based on LiDAR data.
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Optical televiewer log of the four 16-m-deep <b>critical</b> <b>zone</b> monitoring wells...
Published: 01 August 2011
Fig. 2. Optical televiewer log of the four 16-m-deep critical zone monitoring wells (CZMWs; see Fig. 1 for location). Above approximately 6 m, the shale bedrock is olive-brown to yellow-brown, while below this depth the shale is fractured and blue-gray in color, as seen most clearly in CZMW 1