Granite Peak

By January 1944 the CWS had already begun operations at Camp Detrick and at the field test station on Horn Island in Mississippi Sound, and was constructing the Granite Peak test installation, adjacent to Dug-way Proving Ground, Utah, and the Vigo plant in Indiana. 

Biological Warfare Test Station, Granite Peak, Utah. 

Figure 11,23 K-Ca isochron for granite batholith of Pikes Peak (Colorado). Aliquot-spiked samples not included in age calculation. Reprinted from B. D. Marshall and D. J. De Paolo, Geochimica et Cosmochimica Acta, 46, 2537-2545, copyright 1982, with kind permission from Elsevier Science Ltd., The Boulevard, Langford Lane, Kidlington 0X5 1GB, UK.

Figure 11.23 shows the isochron obtained by Marshall and De Paolo (1982) for the granite batholith of Pikes Peak (Colorado). The effectiveness of the double-spike technique is evident, especially when we see that aliquot-spiked samples do not fall on the best-fit interpolant (York s algorithm York, 1969). The obtained age (1041 32 Ma) is consistent with that previously obtained with Rb-Sr whole rock analyses (1008 13 Ma see Marshall and De Paolo, 1982, for references). The initial ratio ( Ca/ Ca)o of 151.0 is identical, within the range of uncertainty, to upper mantle values, indicating negligible contamination by old crust components the relative K/Ca abundance in the earth s mantle is about 0.01, a value too low to alter the primordial (" Ca/" Ca)o composition. 

Biotite is found in the lavas of Vesuvius, at Monzoni, and in many other European localities in the LTnited States, especially in the pegmatites of New England, Virginia, and North Carolina, and the granite of Pikes Peak. Colotado. The mineial was named in honoi of the French physicist. J.B. Biot. Biotite is also known as iron mica. 

The reaction between N and granite discussed above can also be observed (1 ) by SIIB. After N bombardment, the SiMS of graphite exhibits new peaks at 15, 26, 7, 30, 40, 41 and 42 amu... 

Krogstad E. and Walker R. J. (1996) Evidence of heterogeneous crustal sources the Harney Peak granite. South Dakota USA. Trans. Roy. Soc. Edinburgh Earth Sci. 87, 331-337. 

Comprising mainly magnetite, sphalerite, galena and a little chalcopyrite, the Xiaomaoshan polymetallic skam deposit occurs at the contact of porphyritic granite and limestone, at a depth of 110 m. The surface of the area is covered by exotic overburden, on which rice is cultivated. Soil samples taken at 20 m intervals along a traverse yielded twin peaks of Hg, above the hangingwall and footwall contacts of the mineralisation (Fig. 13-7). 

Wanty, R. B. et al. 1992. Weathering of Pikes Peak granite Field, experimental and modeling observations. Proc. 7th inti. conf. water-rock interaction, ed Y. K. Kharaka and A. S. Maest, pp. 599-602. Rotterdam A. A. Balkema. 

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