Granulite Inclusions

High rates of heat flow in the Ross Sea and at Arrival Heights on the Hut Point Peninsula were also reported by Blackman et al. (1984) and by Risk and Hochstein (1974), respectively. 

In conclusion, Berg (1991) pointed out that ultra-mafic inclusions that contain orthopyroxene resemble the two-pyroxene granulite inclusions and, in some cases, are interbedded with them in the largest specimens. However, as noted before, the ultramafic inclusions are not genetically related to the Ferrar Dolerite or to the Cenzoic alkalic lavas of the McMurdo Volcanic Group (McGibbon 1991). 

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Lovering J. F. and White A. J. R. (1964) The significance of primary scapolite in granulitic inclusions from deep-seated pipes. J. Petrol. 5, 195—218. 

The Sr/ Sr ratios of the granulite inclusions in Fig. 16.6c range from 0.70289 to 0.70390 with a mean of 0.70323 0.00019 (2a). This value is surprisingly low for rocks that presumable originated from the base of the continental crust. However, the granulites have a low average Rb/Sr ratio of 0.0145 ( Rb/ Sr =... 

The granulite inclusion from sites in the Ross Embayment have lower values and lower initial Sr/ Sr ratios at 900 Ma than granulite inclusions from the Transantarctic Mountains. These isotopic differences are evident in Fig. 16.9 which also demonstrates that the isotopic compositions of the Kirkpatrick... 

Fig. 16.9 The values and initial Sr/ Sr ratios at 900 Ma of granulite inclusions in the Cenozoic volcanic rocks in the Ross Embayment and in the Transantarctic Mountains form separate clusters. These differences indicate that the inclusions originated from distinctly different crustal sources that are separated from each other by a discontinuity (Kalamarides et al. 1987). The isotope compositions of oxygen and strontium of the Kirkpatrick Basalt in the Transantarctic Mountains (Hoefs et al. 1980) define a third cluster having low values and high initial Sr/ Sr ratios. The evidence in this diagram implies that a tectonic boundary exists in the deep crust underlying the Transantarctic Mountains and the Ross Embayment. The isotopic data also rule out a connection between the granulite inclusions in the Cenozoic lavas and the Kirkpatrick Basalt of the Transantarctic Mountains (Adapted from Fig. 1 of Kalamarides and Berg (1991))...

Appendices 16.8.1 Average Chemical Compositions of the Granulite Inclusion from the Deep Crust Beneath the Transantarctic Mountains and the Ross Embayment (Kalamarides and Berg1991) ... 

Griffin W. L., Carswell D. A., and Nixon P. H. (1979) Lower-cmstal granulites and eclogites from Lesotho, southern Africa. In The Mantle Sample Inclusions in Kimberlites (eds. F. R. Boyd and H. O. A. Meyer). American Geophysical Union, Washington, DC, pp. 59-86. 

Trachyte occurs at Mt. Cis between Cape Royds and Cape Evans. It is oversaturated with respect to silica (i.e., it is quartz normative) and contains abundant inclusions (Thomson 1916 Jensen 1916 Treves 1967). The inclusions consist of sanidinite, pyroxene granulite, diabase, and metamorphosed sandstone. These inclusion suggest that Ross Island may be underlain by granitic basement rocks. Beacon sandstones, and perhaps even by Ferrar Dolerite. 

The inclusions of crustal rocks in the lava flows of the Erebus volcanic province consist of lower-crustal granulites, upper-crustal basement rocks, and supra-crustal rocks. Berg (1991) described inclusions from 17 sites in the Erebus volcanic province, 7 of which are located in the Royal Society Range (Brandau Vent, Roaring Valley, Foster Crater, Ward Valley, The Bulwark, Lower and Upper Radian Glacier) and five on Ross Island (Cape Crozier, Cape Bame, and at three places on the Hut Point Peninsula). 

Lovering, J. F., Tatsumoto, M. Lead isotopes and the origin of granulite and eclogite inclusions in deep-seated pipes. Earth Planet. Sci. Letters 4, 350—356 (1968). 

During the past ten years a number of papers have shown the interest of fluid inclusion studies in many different domains Metambrphism of the Westem Alps (Poty, 1969 Poty et al., 197 ), hydrothermal metamorphism of the oceanic crust (Jehl, 1975 Jehl et al., 1976), pegmatite evolution in low pressure type Hercynian metamorphism (Weisbrod and Poty, 1975) granulite facies and related rocks (Touret, 197 Hollister and Burruss, 1976). The results of these works are summarized elsewhere (Weisbrod et al., 1976). This paper will review some basic principles of the study of fluid inclusions in rocks. For reasons of space, only some aspects and techniques (notably microthermometry) will be discussed in detail and for a more general presentation the interested reader must consult the classical papers of Roedder, notably Roedder,... 

Microfissure carbonic inclusions from Bournac granulites (Bilal and Touret, 197 ). 

Example of correspondence between solid phases and fluid inclusion data Bournac granulites (see Bilal and Touret, 1976). Stability fields of critical minerals indicate a retromorphic evolution from field A to field B fluid inclusions are divided into early fluids (l) and late fluids (ll) on the basis of Tj C02 and of their occurrence in rocks. 

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