“… Fig. 1 (A) A simplified geologic map of Afghanistan (after Benham et al., 2009 and Collet et al., 2015 ). (B) Simplified geological map of the central part of the Kabul terrane outlined as red square in A ( Kafarsky et al., 1975 ).…”
Section: Geological Settingmentioning
confidence: 99%
“…(C) Geological map of the Logar Ophiolite outlined as red rectangle in B ( Dronov et al., 1972 ); the locations of the chromitite occurrences are marked as red solid squares. (D) Simplified litho-stratigraphic section of the Logar ophiolite (modified after Benham et al., 2009 ). …”
Section: Geological Settingmentioning
confidence: 99%
“…The Logar ophiolite massif represents a fragment of the Mesozoic oceanic crust that was obducted on the Kabul terrane during the Himalayan orogeny. The ophiolite complex is overlain by a volcano-sedimentary sequence and accretionary prism sediments of Cretaceous age ( Benham et al., 2009 ). The Logar ophiolite massif is separated from the Argandab-Helmand block to the west by steeply dipping N-S trending Chapman Fault.…”
Chromite is widely distributed in the east and southeast of Afghanistan, especially in Logar Province. Chromite mineralization is podiform-type and is hosted in the stratigraphically lowest ultramafic rocks of the Logar Ophiolite Complex. This ophiolite complex represents a remnant of an early Cretaceous oceanic crust that was thrusted over a late Permian to Mid-Jurassic platform-type sequence of the Kabul Terrane during the Himalayan Orogeny. The ultramafic rocks are composed mainly of dunite and harzburgite, which are variably serpentinized. Chromite mineralization of the Logar area ranges from massive chromitite pods to disseminated chromite crystals in the ultramafic rocks. Microscopically, the chromite exhibits granular texture and is generally fresh; however, some magnetite and/or ferritchromite are formed along the fractures of some chromite grains. The primary interstitial silicate minerals of the massive chromite and the silicate minerals surrounding the disseminated chromite grains are completely altered to serpentine along with some chlorite. Thus, serpentinite is most likely the host of the chromite in the Logar Province. The main aim of this study is discriminate serpentine using the Landsat 8 Operational Land Imager (OLI). The serpentinite of the Logar Province is separated by the combination of bands, principal components, band ratios, and supervised classification techniques. Using Landsat 8 and supervised classification with maximum likelihood classification as a tool for mineral exploration improve lithological mapping in the Logar Valley area.
“… Fig. 1 (A) A simplified geologic map of Afghanistan (after Benham et al., 2009 and Collet et al., 2015 ). (B) Simplified geological map of the central part of the Kabul terrane outlined as red square in A ( Kafarsky et al., 1975 ).…”
Section: Geological Settingmentioning
confidence: 99%
“…(C) Geological map of the Logar Ophiolite outlined as red rectangle in B ( Dronov et al., 1972 ); the locations of the chromitite occurrences are marked as red solid squares. (D) Simplified litho-stratigraphic section of the Logar ophiolite (modified after Benham et al., 2009 ). …”
Section: Geological Settingmentioning
confidence: 99%
“…The Logar ophiolite massif represents a fragment of the Mesozoic oceanic crust that was obducted on the Kabul terrane during the Himalayan orogeny. The ophiolite complex is overlain by a volcano-sedimentary sequence and accretionary prism sediments of Cretaceous age ( Benham et al., 2009 ). The Logar ophiolite massif is separated from the Argandab-Helmand block to the west by steeply dipping N-S trending Chapman Fault.…”
Chromite is widely distributed in the east and southeast of Afghanistan, especially in Logar Province. Chromite mineralization is podiform-type and is hosted in the stratigraphically lowest ultramafic rocks of the Logar Ophiolite Complex. This ophiolite complex represents a remnant of an early Cretaceous oceanic crust that was thrusted over a late Permian to Mid-Jurassic platform-type sequence of the Kabul Terrane during the Himalayan Orogeny. The ultramafic rocks are composed mainly of dunite and harzburgite, which are variably serpentinized. Chromite mineralization of the Logar area ranges from massive chromitite pods to disseminated chromite crystals in the ultramafic rocks. Microscopically, the chromite exhibits granular texture and is generally fresh; however, some magnetite and/or ferritchromite are formed along the fractures of some chromite grains. The primary interstitial silicate minerals of the massive chromite and the silicate minerals surrounding the disseminated chromite grains are completely altered to serpentine along with some chlorite. Thus, serpentinite is most likely the host of the chromite in the Logar Province. The main aim of this study is discriminate serpentine using the Landsat 8 Operational Land Imager (OLI). The serpentinite of the Logar Province is separated by the combination of bands, principal components, band ratios, and supervised classification techniques. Using Landsat 8 and supervised classification with maximum likelihood classification as a tool for mineral exploration improve lithological mapping in the Logar Valley area.
“…The LOC is bounded on the west by the steeply dipping, north-south trending Paghman Fault (Fig. 2) and is separated from the underlying autochthonous rocks of the Kabul block along its northern and northeastern boundaries by the Ab Paran thrust fault (Benham et al 2009), and to the east and southeast, the complex is bounded by the Altimur fault. The major rock types in the Logar Valley chromite subarea are serpentinized harzburgite and dunite with minor noritic dikes in the southernmost areas.…”
Section: Geological and Mineralogical Settingsmentioning
The Aynak-Logar Valley is located about 30 km south of Kabul in Afghanistan and contains the Aynak copper-cobalt deposit. Satellite remote sensing data obtained from Landsat Enhanced Thematic Mapper (ETM+) and DEM extracted from the Shuttle Radar Topography Mission (SRTM) were used to study the surface geology, while regional aeromagnetic data were used to identify the main magnetic sources in the region. The main magnetic anomaly appeared to originate at a depth of less than 1 km, although the coarse 1-km spacing of the gridded aeromagnetic data makes it difficult to be more precise. Other magnetic anomalies in the data were identified using a variety of edge-enhancement filters, 2.5D forward modeling, and 3D inversion model.
“…(Benham et al, 2009;Anonymous, 2000;Anonymous, n.d.d;Bowley, 2012;Dupee, 2012). Modern assessments have been performed by British, Slovakian, and Afghan geologists.…”
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