Popping rock

Pineau F, Javoy M, Bottinga Y (1976) ratios of rocks and inclusions in popping rocks of... 

Most submarine volcanic rocks contain C02-filled vesicles (bubbles) in glassy margins. Because noble gases in silicate melts partition very effectively into a gas phase (i.e., their solubilities are low), it would be expected that noble gases in submarine volcanics would be found in the bubbles as will be discussed later, this seems indeed to be the case (e.g., Kurz Jenkins, 1981 Marty Ozima, 1986 Sarda Graham, 1990 Graham Sarda, 1991). The popping rocks, so-called because of... 

Burnard, R, Graham, D., Turner, G. (1997) Vesicle-specific noble gas analyses of popping rock Implications for primordial noble gases in Earth. Science, 276, 568-71. 

Moreira, M., Kunz, J., Allegre, C. J. (1997) Rare-gas systematics in the upper mantle A complete study of a popping rock. Seventh Annual V. M. Goldschmidt Conference, p. 145. 

Sarda, P., Graham, D. (1990) Mid-ocean ridge popping rocks Implications for degassing at ridge crests. Earth Planet. Sci. Lett., 97, 268-89. 

Moreira M., Kunz J., and Allegre C. J. (1998) Rare gas systematics in Popping Rock isotopic and elemental compositions in the upper mantle. Science 279, 1178—1181. 

Kerguelen xenolilhs O Samoa xenoHths 7 CamNoonline G Popping Rock Shooa/S.MAR e N Chile Ridge o Manus Basin... 

Javoy M. and Pineau F. (1991) The volatile record of a popping rock from the Mid-Atlantic Ridge at 14° N chemical composition of the gas trapped in the vesicles. Earth Planet. Sci. Lett. 107, 598-611. 

Kerguelen xcnoliths Q S oa xenolithfi 7 Cameroon Line O Popping Rock Shona IS MAR e N. Chile Ridge... 

Figure 3 Helium and argon isotope compositions of MORE ( Popping Rock from the Atlantic, Shona ridge section, and N. Chile ridge) and selected islands. " °Ar/ Ar ratios vary widely due to variahle amounts of atmospheric...

A Kerguelen xenclitfas 8 Samoa xenolitfas 7 Cameroon Line O Popping Rock Shona/S.MAR N Chile Ridge O Manns Basin... 

The He/ He ratio of this popping rock is 8.14 0.06 Ra (Sarda and Graham 1990), typical for N Atlantic MORE (Table 2). Helium concentrations are between 50-90x10 std cm /g (Staudacher et al. 1989 Sarda and Graham 1990 Moreira et al. 1998), which is... 

The most precise Ne isotope analyses of volcanic rocks yet available are for the MAR popping rock (Moreira et al. 1998). These stepwise crushing analyses display a very tight Ne isotope correlation that is usually taken as a precise definition of the upper mantle trend for the Ne/ Ne - Ne/ Ne diagram, illustrated by the MORB line in Figure 11. 

Significant decoupling of He and Ne isotopes does appear to occur in some cases, and is best exemplified by the spreading ridge basalts from the Manus Basin (Shaw et al. 2001). Manus Basin basalts have He He ratios up to 15 Ra, yet they show a Ne isotope slope that is less than the MORB trend as defined by the popping rocks (Fig. 11). Shaw et al. (2001) considered several possible explanations for the discrepancy, ruling out crustal contamination, fluid addition from the subducting plate, or addition of Ne from ancient... 

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