The Planation Surfaces of Arfon and Adjacent Parts of Anglesey: A Re-Examination of Their Age and Origin

1964 ◽  
pp. 17 ◽  
Author(s):  
C. Embleton
Keyword(s):  
Planation Surfaces

scholarly journals Neotectonic evolution and sediment budget of the Meuse catchment in the Ardennes and the Roer Valley Rift System

2002 ◽  
Vol 81 (2) ◽  
pp. 211-215 ◽  
Author(s):  
R.T. Van Balen ◽  
R.F. Houtgast ◽  
F.M. Van der Wateren ◽  
J. Vandenberghe
Keyword(s):  
Digital Terrain Model ◽  
River System ◽  
Sediment Budget ◽  
Middle Pleistocene ◽  
Rift System ◽  
Terrain Model ◽  
Fluvial Terraces ◽  
Digital Terrain ◽  
History Of ◽  
Planation Surfaces

AbstractUsing marine planation surfaces, fluvial terraces and a digital terrain model, the amount of eroded rock volume versus time for the Meuse catchment has been computed. A comparison of the amount of eroded volume with the volume of sediment preserved in the Roer Valley Rift System shows that 12% of the eroded volume is trapped in this rift. The neotectonic uplift evolution of the Ardennes is inferred from the incision history of the Meuse River system and compared to the subsidence characteristics of the Roer Valley Rift System. Both areas are characterized by an early Middle Pleistocene uplift event.

scholarly journals Mapping of planation surfaces in the north of Minas Gerais

2016 ◽  
Vol 9 (2) ◽  
pp. 526-545
Author(s):  
Márcio Luiz da Silva
Keyword(s):  
Minas Gerais ◽  
The North ◽  
Planation Surfaces

scholarly journals Weathering of Ophiolite Remnant and Formation of Ni Laterite in a Strong Uplifted Tectonic Region (Yuanjiang, Southwest China)

Minerals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 51 ◽  
Author(s):  
Wei Fu ◽  
Yangyang Feng ◽  
Peng Luo ◽  
Yinmeng Zhang ◽  
Xiaorong Huang ◽  
...  
Keyword(s):  
Southwest China ◽  
Tectonic Setting ◽  
Continuous Operation ◽  
Tectonic Uplift ◽  
Yunnan Plateau ◽  
Active Tectonic ◽  
History Of ◽  
Southwestern Margin ◽  
Planation Surfaces ◽  
Weathering Process

The Yuanjiang Ni deposit in southwestern margin of the Yunnan Plateau is the only economically important lateritic Ni deposit in China. It contains 21.2 Mt ore with an average grade of 1.05 wt % Ni and has been recognized as the second largest Ni producer in China following the Jinchuan super-large magmatic Ni–Cu deposit. This Ni deposit is hosted within the lateritic regolith derived from serpentinite within the regional Paleo-Tethyan Ophiolite remnants. Local landscape controls the distribution of the Ni mineralized regolith, and spatially it is characterized by developing on several stepped planation surfaces. Three types of lateritic Ni ores are identified based on Ni-hosting minerals, namely oxide ore, oxide-silicate mixed ore and silicate ore. In the dominant silicate ore, two phyllosilicate minerals (serpentine and talc) are the Ni-host minerals. Their Ni compositions, however, are remarkably different. Serpentine (0.34–1.2 wt % Ni) has a higher Ni concentration than talc (0.18–0.26 wt % Ni), indicating that the serpentine is more significantly enriched in Ni during weathering process compared to talc. This explains why talc veining reduces Ni grade. The geochemical index (S/SAF value = 0.33–0.81, UMIA values = 17–60) indicates that the serpentinite-derived regolith has experienced, at least, weak to moderate lateritization. Based on several lines of paleoclimate evidence, the history of lateritization at Yuanjiang area probably dates to the Oligocene-Miocene boundary and has extended to the present. With a hydrology-controlled lateritization process ongoing, continuous operation of Ni migration from the serpentinite-forming minerals to weathered minerals (goethite and serpentine) gave rise to the development of three types of Ni ore in the regolith. Notably, the formation and preservation of the Yuanjiang lateritic Ni deposit has been strongly impacted by regional multi-staged tectonic uplift during the development of Yunnan Plateau. This active tectonic setting has promoted weathering of serpentinite and supergene Ni enrichment, but is also responsible for its partial erosion.

Planation surfaces in China: one hundred years of investigation

2008 ◽  
Vol 301 (1) ◽  
pp. 171-178 ◽  
Author(s):  
Ke Zhang
Keyword(s):  
Planation Surfaces

scholarly journals Cenozoic deformation of the South African plateau, Namibia: Insights from planation surfaces

Geomorphology ◽  
2020 ◽  
Vol 350 ◽  
pp. 106922 ◽  
Author(s):  
C. Picart ◽  
O. Dauteuil ◽  
M. Pickford ◽  
F. Mvondo Owono
Keyword(s):  
South African ◽  
The South ◽  
Planation Surfaces

scholarly journals Planation surfaces of the Tian Shan Range (Central Asia): Insight on several 100 million years of topographic evolution

2019 ◽  
Vol 177 ◽  
pp. 52-65 ◽  
Author(s):  
Julien Morin ◽  
Marc Jolivet ◽  
Laurie Barrier ◽  
Amandine Laborde ◽  
Haibing Li ◽  
...  
Keyword(s):  
Central Asia ◽  
Topographic Evolution ◽  
Planation Surfaces ◽  
Tian Shan

Denudation history of the French Massif Central: new insights from thermochronology, basement-basin cross-sections and semi-automated planation surfaces mapping

2020 ◽  
Author(s):  
Thomas François ◽  
Guillaume Baby ◽  
Paul Bessin ◽  
Julien Baptiste ◽  
Jocelyn Barbarand ◽  
...  
Keyword(s):  
Cross Sections ◽  
Sedimentary Cover ◽  
Fuzzy Classification ◽  
French Massif Central ◽  
Surface Mapping ◽  
Massif Central ◽  
Planation Surface ◽  
Surface Uplift ◽  
Source To Sink ◽  
Planation Surfaces

<p>Documenting surface uplift of basement areas is challenging, usually due to large gaps in the sedimentary record. In order to address this issue for the French Massif Central, we here investigate its denudation history through an integrated study that involves planation surface mapping, Apatite Fission-Track (AFT) Analysis and basement to basin cross-sections.</p><p>First, Planation surfaces were identified using a semi-automated fuzzy classification of pixels based on relationships between DEM derivatives (slope, curvature, ruggedness and incision) and field-recognized training samples.  Then, their different generations and age ranges were discriminated from hypsometry, fault partitioning and relationships with dated sedimentary and/or volcanic remnants, providing constraints on basement exhumation. Afterwards, integrating the previous planation surface analysis, geological cross-sections were produced from the Massif Central basement to the surrounding basins (Aquitaine Basin and Paris Basin). These sections provide local thicknesses estimates of the missing sedimentary cover over basement domains. Theses local thicknesses and exhumation phases were finally used as constraints to produce a thermal history modelling and a denudation map of different areas of the French Massif Central estimated from AFT inversion.</p><p>Our results show different burial and exhumation patterns with i) a main burial of its western parts (Limousin, Rouergue) during Jurassic times followed by an important regional denudation (1 to 2 km of missing cover and crystallized basement) during the early Cretaceous and ii) an Upper Cretaceous burial of its northeastern parts (Morvan, Forez) followed by an uppermost Cretaceous to Paleogene exhumation (<1 km of missing cover and crystallized basement). This further illustrates the different behavior of each units of the Massif Central during the Mesozoic to Cenozoic times. These results will ultimately be discussed and placed back into the western European deformation framework.</p><p> </p><p>(This work is founded and carried out in the framework of the BRGM-TOTAL project Source-to-Sink)</p>

Sign in / Sign up

Export Citation Format

Share Document