Local, mid-crustal granulite facies metamorphism and melting: an example in the Mount Stafford area, central Australia

Vernon, R. H.; Clarke, G. L.; Collins, William J.

doi:10.1007/978-94-015-3929-6_11

Cited by 70 publications

(76 citation statements)

References 54 publications

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“…Metamorphism is typically greenschist to upper amphibolite facies in the Mt Isa Inlier and is thus similar to other Australian Proterozoic terranes, although granulite facies conditions were reached in some blocks [e.g. Arunta (Vernon et al 1990), Broken Hill (Binns 1964 and Georgetown (Withnall 1996)]. The enigmatic regional low-pressure/high-temperature metamorphism exhibited by the Australian Proterozoic fold belts does not fit easily into conventional models for heat transfer into the upper crust.…”

Section: Introductionmentioning

confidence: 93%

“…A variety of processes have been proposed to explain the high geothermal gradients necessary for this style of metamorphism. Mechanisms suggested include: compression of previously extended continental crust (Etheridge et al 1987;Oliver et al 1991); mantle delamination (Loosveld & Etheridge 1990); heat advection via intrusions due to high mantle heat flow (Vernon et al 1990;Rubenach 1992;Sandiford et al 1995;Rubenach & Barker 1998); radiogenic heating due to enrichment of heat-forming elements in the upper crust (Mildren & Sandiford 1995;Sandiford et al 1998;McLaren et al 1999); and the burial of heat-producing stratigraphic sequences (Hand & Rubatto 2002).…”

Section: Introductionmentioning

confidence: 99%

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Isograd pattern and regional low-pressure, high-temperature metamorphism of pelitic, mafic and calc-silicate rocks along an east – west section through the Mt Isa Inlier

Foster

Rubenach

2006

Australian Journal of Earth Sciences

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Isograd pattern and regional low-pressure, high-temperature metamorphism of pelitic, mafic and calc-silicate rocks along an east – west section through the Mt Isa Inlier

Foster

Rubenach

2006

Australian Journal of Earth Sciences

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“…The high-temperature metamorphism was not associated with pervasive deformation and the metamorphic character is best described as regional contact metamorphism (e.g. Clarke et al 1990;Vernon et al 1990;. The extreme vertical and horizontal metamorphic gradients, the low strain nature of the Mt Stafford terrain and the apparent absence of major detachment structures that would have facilitated fast tectonic unroofing (Stewart 1981;Clarke et al 1990;Vernon et al 1990;Greenfield et al 1998) suggest that metamorphism occurred in magmatically driven system.…”

Section: The Stafford Tectonic Event C 1820 Mamentioning

confidence: 99%

Tectonic evolution of the Reynolds-Anmatjira Ranges: a case study in terrain reworking from the Arunta Inlier, central Australia

Hand

Buick

2001

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The Reynolds-Anmatjira Range region forms part of the Arunta Inlier in central Australia and has undergone four tectonothermal cycles that span an interval of c. 1450 Ma. The first two cycles were the Stafford Tectonic Event c. 1820Ma, and the Strangways Orogeny c. 1770-1780 Ma, both of which were associated with regional low-pressure hightemperature metamorphism up to granulite grade that was coeval with the emplacement of voluminous sheet-like granites. The subsequent Chewings Orogeny occurred at around 1590-1570 Ma and was a long-lived event that produced regional low-pressure greenschist to granulite facies metamorphism without obvious associated magmatism. During the mid-Palaeozoic Alice Springs Orogeny (400-300 Ma), the terrain was dissected by a system of sub-greenschist to mid-amphibolite facies shear zones. In the Reynolds Range, the Proterozoic events produced a single regional foliation that is axial planar to simple large-scale folds. The composite regional Proterozoic foliation increases in grade smoothly from northwest to southeast, producing a pattern of isograds that is remarkably similar to those that formed during the mid-Palaeozoic Alice Springs Orogeny. Despite this simple pattern, the isograds reflect the superimposed metamorphic effects of four unrelated tectonothermal cycles. Without geochronological and stratigraphic information, the degree of terrain reworking in the Reynolds-Anmatjira Range region could have been largely obscured by the apparent simplicity of many of the structural and metamorphic relationships.

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“…This feature is commonly interpreted as evidence for magmatic crystallization of andalusite, depending upon temperature and water activity (Albuquerque, 1971;Clarke et al, 1976;D'Amico et al, 1981;Maillet and Clarke, 1985). There is no doubt that Al-Fe-Mg silicates can precipitate from a peraluminous granitic melt, as demonstrated in many experimental works such as Green (1976), Dimitriades (1978), Clemens and Wall (1981), and Johannes and Holtz (1990), and the occurrence of andalusite in some peraluminous leucosomes has been well documented (e.g., Vernon et al, 1990).…”

Section: Tosellimentioning

confidence: 88%

Geochemistry and Genesis of the S-Type, Cordierite-Andalusite-Bearing Capillitas Batholith, Argentina

Toselli

Sial

Saavedra

et al. 1996

International Geology Review

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The Ordovician Famatinian-age magmatic cordierite-andalusite-bearing Capillitas batholith, in the Pampean Ranges of northwestern Argentina, encompasses a coarsely porphyritic to equigranular two-mica monzogranite with equigranular, fine-grained, late leucogranitic muscovite-rich facies. This batholith exhibits sharp, discordant contacts with low-pressure biotiteandalusite-cordierite schists of the La Cébila Formation, locally developing biotite-cordieritemuscovite-bearing contact hornfels aureoles.The two-mica monzogranite contains cordierite, andalusite, and sillimanite, although cordierite and andalusite are more abundant in the leucogranitic equigranular facies. These minerals are not homogeneously distributed and the three minerals are found together only locally. The presence of biotite-rich xenoliths with a high amount of anhydrous aluminum silicates (andalusite, sillimanite) and cordierite, exhibiting textures similar to those of the host monzogranites, suggest that, at least in part, they have been incorporated into the magma and reequilibrated. The pressure during emplacement was probably 4 kbar under near-solidus temperature, thus preserving the anhydrous aluminum-silicate stability under high H 2 O activity.The major-element data indicate a peraluminous calc-alkalic trend with compositional gaps. They attest to the existence of two distinct magma pulses. The chondrite-normalized REE patterns and multi-element spidergrams point to a probable origin by crustal (metasediment?) anatexis for both pulses. Peraluminous granitic magma cannot be a primary melt of metaluminous quartz-amphibolite, since there is a great geochemical homogeneity of all the granitoids. Igneous xenoliths are absent and the isotopic compositions of the granitoids correspond to those of metasedimentary sources. Both major and trace elements point to a collisional tectonic environment of an inner-continental magmatic arc.

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Local, mid-crustal granulite facies metamorphism and melting: an example in the Mount Stafford area, central Australia

Cited by 70 publications

References 54 publications

Isograd pattern and regional low-pressure, high-temperature metamorphism of pelitic, mafic and calc-silicate rocks along an east – west section through the Mt Isa Inlier

Isograd pattern and regional low-pressure, high-temperature metamorphism of pelitic, mafic and calc-silicate rocks along an east – west section through the Mt Isa Inlier

Tectonic evolution of the Reynolds-Anmatjira Ranges: a case study in terrain reworking from the Arunta Inlier, central Australia

Geochemistry and Genesis of the S-Type, Cordierite-Andalusite-Bearing Capillitas Batholith, Argentina

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