... content or porosity is the primary control on resistivity and permeability. The applicability of the technique is tested on the gravel aquifer at Desborough Island, UK. 28 8 1997 29 9 1998 © 1999 The Geological Society 1999 The Geological Society aquifers geophysics gravel...

... University, Calcutta Introduction: While investigating the sulphide minerals occurring in the subalkaline tholeiitic basalts of Kilauea volcano, Hawaii island, Desborough et af (1968) reported the occurrence of an unusual copper-iron sulphide mineral whose composition differs from known synthetic and natural...

... 5 ) was found in the Oda River draining through crystalline schists, gabbro and serpentinite in Ehime Prefecture, Shikoku Island, Japan (Nishio-Hamane et al. , 2018 ). In southern New Zealand, alloys with a wide range in composition occur in Quaternary placers derived from sources within...

... concerning transport mechanism and sedimentological environment. Au grains are a natural alloy of Au, Ag, Cu, etc. in proportions that vary with the condition of ore formation ( Desborough 1970 ; Boyle 1979 ). This alloy is unstable in weathering conditions, an Ag-depleted rim being common around...

...Harvey E. Belkin; Andrew E. Grosz ABSTRACT Black sand beach placers from Kodiak, Sitkinak, and Tugidak Islands, Alaska, have been mined intermittently for gold and minor platinum-group alloys for more than 100 years. High-grade platinum-rich magnetic separate and accompanying black sand from...

... and Tegner (2016) estimated that the initial Skaergaard magma contained 240 ppm Cu and 89 ppm S, with an S/Se ratio of 937–1180. The S concentrations are anomalously low compared with mid-oceanic ridge basalt (MORB) and ocean-island basalt (OIB) (800–1500 S; e.g., Gerlach and Graeber, 1985 ) and flood...

... veins ( Heinrich 1977 ) and alkali pegmatites ( Kearns 1995 ), as well as in the Ivigtut cryolite deposit, in Greenland ( Pauly 1965 ). They also can form as a product of the low-temperature alteration of basalt ( Naughton et al. 1976 ) to rhyolitic ( Desborough & Rostad 1980 ) rocks in acid, F...

... DEB MUKHERJEE Department of Geological Sciences, Jadavpur University, Calcutta Introduction: While investigating the sulphide minerals occurring in the subalkaline tholeiitic basalts of Kilauea volcano, Hawaii island, Desborough et af (1968) reported the occurrence of an unusual copper-iron sulphide...

... (several hundred ppb for Pt and Pd). Data from Coveney et al. (1992a , b). FIGURE 2 • Provinces of south China and locations of major Ni-Mo-(Au-PGE) deposits. Generalized Cambrian paleogeographic features: A = landmasses; B = shallow epiconlinenlal sea; C = deeper epicontinental sea and islands...

...., the Dwarsrivier sheet: Wagner, 1929 ; the Grootboom and Tweefontein sheets: Cameron and Desborough, 1964 ). Here we investigate a large, unmineralized pipe-like body on the Winnaarshoek property ( Fig. 1 ) which has not been described before. This body is categorized as a magnesian dunite pipe on the basis...

... ; Scoon, 1994 ) or of the importance of hydrothermal processes in formation of discordant bodies ( Sohnge, 1963 ; Cameron and Desborough, 1964 ; Irvine, 1980 ). Figure 2. Geological section of the main adit at Driekop (looking approximately north) based on Wagner (1929) with new data from...

... of plumbojarosite in sample 02AH16D from the Cub deposit; Table 1 ), are from sulphides. The presence of jarosite is also significant because it can itself be a major acid-generating mineral ( Desborough & Fey 1997 ), further promoting a low pH environment. Anglesite has been shown to be a more significant...

..., A.M. ( 1977 ) Plumbian tennantite from Sark, Channel Islands. Mineralogical Magazine , 41 , 59 –63. Davis, R.J., Clark, A.M. and Criddle, A.J. ( 1977 ) Palladseite, a new mineral from Itabira, Minas Gerais, Brazil. Mineralogical Magazine , 41 , 123 [and miniprint, M10–M13]. Embrey...

... and natrojarosite ( Desborough et al. 2010 ). Figure 12 Partial X-ray diffractograms for acid-sulfate altered deposits from Cerro Negro, Telica, and Masaya volcanoes. The figure shows peaks between 2 = 28 and 31°, encompassing the range where primary diffraction peaks for natroalunite-natrojarosite solid...

... within much larger, stock-like bodies of barren magnesian dunite, which may include harzburgite. Wagner (1929) considered the pipes to be magmatic, intrusive bodies. Later authors ( Cameron & Desborough 1964 , Schiffries 1982 , Stumpfl & Rucklidge 1982 ) proposed metasomatic models, which...

... deposition of the Green River Formation in Lake Uinta, resulting in 13 C enrichment and promoting precipitation of diagenetic carbonates in profundal lake-bottom sediments ( Desborough 1978 ; Reitsema 1980 ; Pitman 1996 ; Sarg et al. 2013 ; Lowenstein et al. 2017 ). Others ( Wolfbauer and Surdam 1974...

..., 1982; Carten, 1986; Dilles, 1987; Dilles et al., 1992; Dilles et al., 2000; Lipske and Dilles, 2000) ■ Climax, Colorado (Roedder, 1971; Hall et al., 1974; Desborough and Sharp, 1978; White et al., 1980; Shannon et al., 2009) ■ Henderson, Colorado (Wallace et al., 1978; Gunow et al., 1980...

..., Hyderabad for providing the necessary facilities. The financial assistance received by TPS from the University Grants Commission and Council of Scientific and Industrial Research, New Delhi is gratefully acknowledged. References BARKER, F., WONES, D. R., SHARP, W. N. and DESBOROUGH, G. (1975) The Pikes Peak...

... calderas ( Banin et al., 1997 ), cold acid groundwater springs at, for example, Ellesmere Island, Canada ( Battler et al., 2013b ), and “acid ice:” low-pH water-rock interactions along the margins of glaciers and permafrost ( Lacelle and Léveillé, 2010 ; Battler et al., 2013a ). To date, Martian jarosite...

... al. (1998) suggested that Ag-rich electrum is related to reduced fluids that reacted with more oxidized ultramafic rocks at the Archean Transvaal gold deposit (Australia). Zoned electrum has been reported in epithermal deposits in the United States, Spain, and Japan ( Desborough et al. 1971...