Geoelectrical imaging of a thick regolith developed on ultramafic rocks: groundwater influence

Robineau, Bernard; Join, Jean-Lambert; Beauvais, Anicet; Parisot, Jean-Claude; Savin, Cécile

doi:10.1080/08120090701305277

Cited by 31 publications

(23 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A lateritic profile several tens of metres thick envelopes this massif, which forms a 600‐m‐high dome. A gently (8° according to Robineau et al. , 2007 and Beauvais et al.…”

Section: Geological Settingmentioning

confidence: 99%

First palaeomagnetic dating of ferricrete in New Caledonia: new insight on the morphogenesis and palaeoweathering of ‘Grande Terre’

et al. 2011

View full text Add to dashboard Cite

Comparing palaeolatitudes estimated from remanent magnetization data of ferricrete developed over laterite at two sites (Goro and Tié baghi) against the apparent polar wandering path of Australia provides new time constraints for the peridotite weathering in New Caledonia. The Tié baghi Massif of the West Coast klippes displays a single episode of ferricrete development during latest Oligocene times. By contrast, the Goro site in the southern part of the 'Massif du Sud' reveals a more complex history with several episodes of ferricrete development from latest Oligocene to Pliocene-Quaternary times. These data have made it possible to constrain the post-obduction geodynamics and associated morphogenesis of New Caledonia since related uplift probably prevented regolith development until latest Oligocene times. Moreover, the later uplift and deep erosion of the West Coast klippes during the Early Miocene probably prevented further regolith preservation.

show abstract

“…A lateritic profile several tens of metres thick envelopes this massif, which forms a 600‐m‐high dome. A gently (8° according to Robineau et al. , 2007 and Beauvais et al.…”

Section: Geological Settingmentioning

confidence: 99%

First palaeomagnetic dating of ferricrete in New Caledonia: new insight on the morphogenesis and palaeoweathering of ‘Grande Terre’

et al. 2011

View full text Add to dashboard Cite

show abstract

“…In construction site investigations, they offer semi-continuous and sometimes continuous profiling of structures inimical to civil works projects (Soupios et al, 2002;El-Qady et al, 2005;Chavez et al, 2014;Yassin et al, 2014). They also provided information on the thickness of the regolith and depth to competent bedrock or formations (Robineau et al, 2007), morphology and spatial distribution of underlying geofeatures (Aminu, 2015a), groundwater regimes (Rizzo et al, 2004;Bufford et al, 2012;Aminu et al, 2014) and ground corrosivity (). They sometimes provide quantitative estimates of insitu geo-technical properties (Anderson, 2006;Cosenza et al, 2006) of the subsurface geologic strata and clues to the tectonic history of surveyed areas (Bufford et al, 2012;Aminu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Subsurface electrical resistivity imaging and electromagnetic conductivity profiling at a proposed construction site at Adekunle Ajasin University campus, Akungba-Akoko, South-Western Nigeria

Aminu¹

2019

Glo Jnl Geo Sci

View full text Add to dashboard Cite

Electrical resistivity imaging and co-planar loop electromagnetic conductivity measurements have been employed to delineate the bedrock topography and subsurface distribution of structural features at a construction site on the campus of Adekunle Ajasin University. The goal was to map the subsurface geological disposition and to identify features which could adversely impact on the ongoing construction works. Data were collected along three geophysical traverses using the ABEM1000 Terrameter unit and the EM34 Co-planar loop electromagnetic system. Traverse 1 trend roughly east-west for a total length of 155m while traverses 2 and 3 are trend north-south for 80m each. The collection of electrical resistivity data utilized the dipole-dipole array with an electrode separation of 5 m and maximum dipole spread of 35m. Observed field data were processed and inverted using a finite-element modelling inversion algorithm. Conductivity were collected at 10m coil separation and plotted against station positions. A station separation of 5m was maintained on all traverses for both data sets. Three geo-electric layers were delineated; a thin highly discontinuous low resistivity layer representing the humus-rich top soil, a continuous consistently high resistivity layer with a highly rugose upper layer and several near vertical scarps representing the fresh bedrock and intermediate resistivity layer representing the weathered bedrock separating the upper low resistivity and basal high resistivity signatures. Overburden thickness rarely exceeds 4 m with the exception of the deep weathering section in the southwest and at fracture points with the bedrock. Perennial groundwater flow at the site is restricted to the southeastern sections of the site.

show abstract

“…Consequently, directions of fractures are scattered, although inherited structures are still dominant. In the north of New Caledonia, on the Tiébaghi massif (Figure a), the ultramafic protolith is covered by an extensive ferricrete with elongated dolines aligned along a dominant N 130° and a subordinate N 0° direction which corresponds to a fracture field associated with felsic dykes and developed in successive dextral, transtensional, and extensional regimes (Robineau and Join, ; Robineau et al , ). A similar pattern is to be found in the Massif du Sud (Figure c); (5) late post‐obduction evolution is characterized by limited vertical motions and eustatic variations (Folcher et al , ).…”

Section: Introductionmentioning

confidence: 99%

Morphology and distribution of dolines on ultramafic rocks from airborne LiDAR data: the case of southern Grande Terre in New Caledonia (SW Pacific)

Jeanpert

Genthon

Maurizot

et al. 2016

Earth Surf Processes Landf

View full text Add to dashboard Cite

Finally, we propose a pioneering morphometric typology of dolines that provides important clues as to pseudokarstic activity. We define collapse, bowl-shaped and flat bottom dolines. Collapse and bowl-shaped dolines are assumed to denote active pseudokarst. They may widen and deepen, or eventually be filled by sediments.They are distinguished from flat bottom dolines that are partially to completely filled, This article is protected by copyright. All rights reserved. which suggests that they are associated with paleo-pseudokarsts. However the groundwater flow paths associated with the genesis and evolution of dolines must be clarified, thus collapse and bowl-shaped dolines should be hydrologically monitored.

show abstract

Geoelectrical imaging of a thick regolith developed on ultramafic rocks: groundwater influence

Cited by 31 publications

References 10 publications

First palaeomagnetic dating of ferricrete in New Caledonia: new insight on the morphogenesis and palaeoweathering of ‘Grande Terre’

First palaeomagnetic dating of ferricrete in New Caledonia: new insight on the morphogenesis and palaeoweathering of ‘Grande Terre’

Subsurface electrical resistivity imaging and electromagnetic conductivity profiling at a proposed construction site at Adekunle Ajasin University campus, Akungba-Akoko, South-Western Nigeria

Morphology and distribution of dolines on ultramafic rocks from airborne LiDAR data: the case of southern Grande Terre in New Caledonia (SW Pacific)

Contact Info

Product

Resources

About