The Askot klippe consists of an 1857 ± 19 Ma granite-granodiorite gneiss, coeval 1878 ± 19 Ma felsic volcanic rock, and circa 1800 Ma quartzite …

son, 1907, p. 560). In 1857 the mill was destroyed by fire. Estimates of gold extracted from the mine until the fire range from $75,000 to over $1,000,000 (Taber, 1913, p. 154). The mine was reopened in 1880 with a 10-stamp mill and copper plates for amalgamation. Very little gold was recovered, as was also the case in 1890 when sev-

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first mentione b Holmberyd (1857)g Th.e first detaile geologicad descriptio wal s n given by Laitakar (1914)i . The exploitatio o thf pegmatitne startee d in 1942 Befor. the onlne quarty haz beed n temporarily quarrie a thtd ene od thf lase t century. However th neede, os thf steele - making industr duriny thg Secone World d

Geochronological and geochemical analyses were performed on K-feldspar granites and monzonitic granites from the Xilinhot area, Inner Mongolia, China. Zircon U/Pb ages indicate that the two types granites were emplaced during the Lower Carboniferous. The K-feldspar granites (332 Ma) have the typical A-type granite characteristics of a post-collision setting.

between 1857 and 1863 Ma. A discordia line constructed through these four analy~es has an upper intercept age of 186 1.2 +3.8/-3.4 Ma which is interpreted as a good estimate for the age of emplacerncnt and is indistinguishable from the age obtained for 9651-50 above.

The K-feldspar granites (332 Ma) have the typical A-type granite characteristics of a post-collision setting. The monzonitic granites have an emplacement age of 323 Ma. ... crusher (to a size of ...

It has been reported that the detachment of fine IM particles from coal/char during combustion is a key mechanism for PM 10 formation, while fine IM in a burning coal particle clearly undergoes coalescence to form large agglomerated ash particles .On the other hand, almost all particles < 0.22 μm in diameter were formed by processes such as the …

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Smaller stones and irregular pieces were crushed by a stone crusher and used in road construction. However, river gravel was cheaper to obtain and soon replaced crushed granite for roadwork. [picture of Willis J. Carter] Willis J. Carter (1857-1906). One of the men who worked in the Guilford quarries was Willis J. Carter, who came from the ...

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Y7: feldspar-rich garnet granuliteA banded rock in which coarse subhedral garnet (25%) forms lenses within medium-grained matrix composed of polygonal grains of plagioclase (56%), Cpx (10%), minor alkali feldspar, quartz and amphibole (pargasite). Opaque minerals (1%) are ilmenite and rutile. Apatite is relatively abundant (about 1%).

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This study presents in situ strontium (Sr) isotope and Sr content data on multi-stage epidote crystals from ultrahigh-pressure (UHP) eclogites and omphacite–epidote veins therein at Ganghe (Dabie terrane, China), determined using LA-MC-ICP-MS. The Ganghe eclogites occur as lenses in mainly leucocratic UHP gneisses, and therefore, our data provide insights into the …

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feldspar-ric h granulites, ex cept for Uk3 5, and display weak positive slopes from Gd to Lu in pr imi tive mantle normalized trace element patterns (Fig . 3 a) .

The Askot klippe consists of an 1857 ± 19 Ma granite-granodiorite gneiss, coeval 1878 ± 19 Ma felsic volcanic rock, and circa 1800 Ma quartzite and is a small vestige of a Paleoproterozoic continental arc that formed on the …