نتایج جستجو برای: alteration mapping
تعداد نتایج: 243159 فیلتر نتایج به سال:
[1] Hydroschorlomite, a Ti-, Ca-, Fe-rich andraditic garnet present in the deepest cores of basalts (661– 749 mbsf) drilled in Hole 1256D during Ocean Drilling Program (ODP) Leg 206 (equatorial east Pacific), is reported here for the first time in oceanic crust. Detailed petrological and mineralogical studies by optical microscope, electron microprobe, scanning and transmission electron microsc...
During its 25 years of production from 1972 to 1998, the Gibraltar Cu-Mo mine in east-central British Columbia (Figure 1) milled a total of 324 million tons of ore containing an average 0.351% Cu from four open pits. Fieldwork during 2000 involved just over two weeks of detailed pit mapping at the mine. Results of this work and several earlier intervals of pit mapping conducted in 1998 and 1999...
Stroke is the leading cause of adult disability. Recent studies show that the brain can engage in a limited process of neural repair after stroke: re-mapping of sensory and motor function and sprouting of new connections in peri-infarct cortex surrounding the stroke. Changes in cortical sensory and motor maps and alterations in axonal structure are dependent on patterned neuronal activity. The ...
Stikine Terrane arc rocks in the re,:ion host !;(m:ral copper-gold and copper-molybdenum ocnlwerlces (MINFILE 104 G and H). The volcrrnic strat.i,:raphy hosting these deposits is, however, poorly const:aimd. The Tatogga Lake project will attemp; to characterize individual deposits, desclibe their h a 1 and rcgictnal stratigraphic and structural settings, and deternme the ages of magmatism ...
Space-borne hyperspectral imagery data are known for their high spectral resolution in a number of narrow wavelength intervals, which makes these useful mineral mapping. However, the available free-of-charge scenes cover only and scattered geographic areas. In contrast, multispectral have nearly complete spatial coverage wider intervals. The low data, however, limits efficiency mapping small ge...
The Astaneh granitoid massif is located about 40 km to Arak city, central Iran, is a part of Sanandaj-Sirjan structural Zone. These intrusive rocks which are mainly composed of grnodioritic rocks, widely affected under hydrothermal alteration. The alteration zones, on the basis of field studies and mineralogy as well as the study of the REE behavior, are investigated in this paper. Eight altera...
The Kirazlı mineral district is located at the center of Biga peninsula metallogenic province, in a geological setting characterized by an extensional tectonic environment. hosts high-sulfidation (HS) ore body with total reserve 33.86 Mt @ 0.69 g/t Au and 9.42 Ag within large-scale hydrothermal alteration. Although ideal magmatic-hydrothermal models present spatial temporal association HS-epith...
The Northern Carnarvon Basin (NCB) hosts an extensive record of Jurassic–Cretaceous rift-related igneous activity, manifested by a >45 000 km2 intrusive complex and series volcanic centres constrained seismic mapping. However, there are relatively few well penetrations these rocks (<1% ~1500 exploration wells) in comparison to other basins that witness magmatism, thus, their lithological ...
1.0 Introduction The 0.4 to 2.5 μm spectral range provides abundant information about many important Earth-surface minerals (Clark et al., 1990). In particular, the 2.0 to 2.5 μm spectral range covers spectral features of hydroxyl-bearing minerals, sulfates, and carbonates common to many geologic units and hydrothermal alteration assemblages. Imaging Spectrometers, or “Hyperspectral” sensors pr...
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