Granitic rock

On the basis of O/ O ratios, Taylor (1977, 1978) subdivided granitic rocks into 

Many granitic plutonic rocks throughout the world have relatively uniform 0-contents with 5 0-values between 6 and 10%c. Granitoids at the low 0 end of the normal group have been described from oceanic island - arc areas where continental crust is absent (e.g., Chivas et al. 1982). Such plutons are considered to be entirely mantle-derived. Granites at the high end of the normal 0-group may have 

Granitic rocks with 5 0-values lower than 6%c cannot be derived by any known differentiation process from basaltic magmas. Excluding those low gran- 

---

N.P. Dikiy, S.Yu.Sayenko, V.L. Uvarov, E.P. Shevyakova, The nuclear-physical methods application for a radionuclide transport in a granite rocks studies. VANT, Nuclear-Physical Researches Series, 2000. No. 2, p. 54-57. 

Granit-fels, -felsen, m. granitic rock, granitfdrmig, a. granitifomi. granitisch, a. granite, granitic. 

Pavich, M. J. (1986). Processes and rates of saprolite production and erosion on a foliated granitic rock of the Virginia Piedmont. In "Rates of Chemical Weathering of Rocks and Minerals" (S. M. Coleman and D. P. Dethier, eds), pp. 551-590. Academic Press, New York. 

Ore deposits associated with volcanic rocks generally exhibit polymetallic (Cu, Pb, Zn, Sn, W, Au, Ag, Mo, Bi, Sb, As and In) mineralization. Sulfur isotopic values of sulfides from these deposits are close to 0%o, suggesting a deep-seated origin of the sulfide sulfur. Clay deposits (pyrophyllite, sericite and kaolinite) are associated with both felsic volcanic rocks and ilmenite-series granitic rocks of late Cretaceous age in the San-yo Belt. 

In Southwest Japan, two styles of vein-type mineralization (Hg and Sb) formed from middle Miocene to the present. Many Hg and Sb deposits are present along the Median Tectonic Line, associated with the Setouchi andesites and ilmenite-series granitic rocks (Fig. 1.3). 

The ore deposits can be classed into two types based on the types of associated metals Au-Ag rich deposits (Type A) from which An and Ag are produced as main products, and base metal (Cu, Pb, Zn, Mn, (Sn), (W), (Bi), (Mo), (Sb)) rich deposits (Type B) from which Au and Ag are recovered as byproducts. The deposits are associated with felsic and intermediate volcanic rocks but generally not with felsic plutonic rocks. In Japan Au-Ag deposits associated with granitic rocks (e.g., Au-Ag vein-type deposits in Kitakami) occur commonly. However, these plutonic-type deposits are not described here. 

According to Ishihara (1977), these granitic rocks are ilmenite-series while granitic rocks in Green tuff region are magnetite-series. ... 

Ilmenite-series and magnetite-series granitic rocks are defined as follows (Ishihara, 1977) the magnetite-series and ilmenite-series granitic rocks are distinguished by the presence or absence, respectively, of magnetite in polished sections. 

Ages of mineralization in the Hidaka and Kitakami regions may be Cretaceous, considering the ages of associated granitic rocks. 

Ishihara, S. (1977) The magnetite-series and ilmenite-series granitic rocks. Mining Geology, 27, 293-305. 

Arima hot springs are located at middle Honshu. The geology of this area is composed of upper Cretaceous, and Paleogene granitic rocks. 

The Beppu hot springs are located at the eastern end of the Beppu-Shimabara Graben, Kyushu. The basement rocks are composed of Paleozoic crystalline schists and Cretaceous granitic rocks. Miocene to early Pleistocene andesitic rocks occur mainly in the southern part of the area, while lava domes of hornblende andesite which are younger than 100,000 years occur in the western part. 

Host rocks in the Hitachi area suffered regional metamorphism, contact metamorphism by Cretaceous granitic rocks and hydrothermal alteration associated with sulfide mineralization. 

In vertisols on diorite, basalt, alluvions, and dolerite, total Mn is in the range of 1250-2750 mg/kg, while brown isohumic soils on calcareous sandstone and clayey sediments contain 550-1670 mg/kg Mn. Soils in the Adelaide and Southeast regions contain 140-1400 mg/kg total Mn. In solods on granitic rocks and alluvions, total Mn is 60-990 mg/kg. 

Feth J.H., Roberson G.E., Polzer W.L. Sources of mineral constituents in water from granitic rocks, Sierra Nevada, California and Nevada. US Geol Surv Water Supply Pap 1964,1535-M. 

Plants adapted to extreme habitats, such as old fields and granite rock outcrops, and plants typical of early successional stages are relatively radioresistant. 

The injected C02 water is diluted with the reservoir fluid within 3 days. Most C02 in them might be deposited as calcite by interaction with granitic rocks. Ca... 

KEYWORDS Ulsan carbonate rocks, Kyongsang Basin, magnetite deposit, melting/fluxing of crustal carbonate melt, Alkaline A-type granitic rocks... 

The Ulsan carbonates (Fig. 1) have long been interpreted as limestone of Paleozoic age or "age unknown" and as the host of a skarn-type iron (magnetite) deposit due to the intrusion of Cretaceous granitic rocks (Park Park 1980 Choi et al. 1999). However, a Paleozoic marine limestone hypothesis fails to explain the spatial association or the relationship between carbonate and ultramafic rocks in a concentric, ellipsoidal shape surrounded by Cretaceous sedimentary, volcanic, and granitic rocks. The sedimentary hypothesis also fails to explain the isolated exposure of a funnel-shaped Paleozoic marine limestone where no marine limestone has been previously observed within the Mesozoic Kyongsang Basin. 

Not all lakes that are exposed to acid rain become acidified. In areas where there is plenty of limestone rock, lakes are better able to neutralize acid. In areas where rock is mostly granite, the lakes cannot neutralize acid. Unfortunately, much of eastern Canada—where most of the acid rain falls—has a lot of granite rock and therefore a very low capacity for neutralizing acids. 

It is good that we should be concerned about the environmental impact of what we, as chemists, do to our planet. But many environmental campaigners too easily confuse radioactive toxicity and chemical toxicity. For example, the radon gas emanating from naturally occurring granite rocks is chemically inert, because it is a rare gas, but it is toxic to humans because of its radioactivity. Conversely, sodium cyanide contains no radioactive constituents yet is chemically toxic. 

We will take an example of closed-system meteoric-hydrothermal alteration of a granitic rock (modified from Taylor, 1978). A granitic rock with 8lsO= +8 and 8D=—65 is invaded by meteoric water (8180= —16, 8D= —120). Assume that... 

---