Melt extraction and accumulation from partially molten rocks

Bons, Paul D.; Arnold, Jochen; Elburg, Marlina; Kalda, Jaan; Соэсоо, Алвар; Milligen, B. Ph. van

doi:10.1016/j.lithos.2004.04.041

Cited by 87 publications

(96 citation statements)

References 128 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ito & Martel 2002). Two other studies by Soesoo et al (2004) and Bons et al (2004) report widths of magmatic veins in a drill core from the Palaeoproterozoic Estonian basement and from a stromatic migmatite north of Turku, in the Palaeoproterozoic migmatitegranite belt of southern Finland. In the Estonian drill core, which is oriented at 70…”

Section: (B) What Data Do We Have and How May We Use Them?mentioning

confidence: 89%

“…Most of these studies are in one or two dimensions (e.g. Oliver & Barr 1997;Sawyer 2001;Guernina & Sawyer 2003;Bons et al 2004;Soesoo et al 2004), or they use approximately perpendicular two-dimensional surfaces to infer the three-dimensional form of the leucosome networks (e.g. Collins & Sawyer 1996;Tanner 1999;Solar & Brown 2001a;Marchildon & Brown 2003;Brown 2005); one study is in three dimensions , and one study investigated the original form of collapse structures formed by draining of melt (Bons et al 2008).…”

Section: (B) What Data Do We Have and How May We Use Them?mentioning

confidence: 99%

See 1 more Smart Citation

The spatial and temporal patterning of the deep crust and implications for the process of melt extraction

Brown

2010

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

Volumetrically significant melt production requires crustal temperatures above approximately 800• C. At the grain scale, the former presence of melt may be inferred based on various microstructures, particularly pseudomorphs of melt pores and grainboundary melt films. In residual migmatites and granulites, evidence of melt-extraction pathways at outcrop scale is recorded by crystallized products of melt (leucosome) and residual material from which melt has drained (melanosome). These features form networks or arrays that potentially demonstrate the temporal and spatial relations between deformation and melting. As melt volume increases at sites of initial melting, the feedback between deformation and melting creates a dynamic rheological environment owing to localization and strain-rate weakening. With increasing temperature, melt volume increases to the melt connectivity transition, in the range of 2-7 vol% melt, at which point melt may escape in the first of several melt-loss events, where each event represents a batch of melt that left the source and ascended higher in the crust. Each contributing process has characteristic length and time scales, and it is the nonlinear interactions and feedback relations among them that give rise to the dissipative structures and episodicity of melt-extraction events that are recorded as variations in the spatial and temporal patterning of the crust. Focused melt flow occurs by dilatant shear failure of low-melt fraction rocks creating melt-flow networks that allow accumulation and storage of melt, and form the link for melt flow from grain boundaries to veins allowing drainage to crustal-scale ascent conduits. Preliminary indications suggest that anatectic systems are strongly self-organized from the bottom up, becoming more ordered by decreasing the number and increasing the width of ascent conduits from the anatectic zone through the overlying subsolidus crust to the ductile-to-brittle transition zone, where the melt accumulates in plutons.

show abstract

Section: (B) What Data Do We Have and How May We Use Them?mentioning

confidence: 89%

Section: (B) What Data Do We Have and How May We Use Them?mentioning

confidence: 99%

The spatial and temporal patterning of the deep crust and implications for the process of melt extraction

Brown

2010

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…Clemens and Mawer, 1992;Petford et al, 1994Petford et al, , 2000, self-propagating hydrofractures (e.g. Weertmann, 1971;Sleep, 1988;Bons et al, 2004;Kisters et al, 2009) or ductile fractures (e.g. Weinberg and Regenauer-Lieb, 2010;Sawyer, 2014; see comprehensive reviews by Brown, 2007Brown, , 2013 for a compilation of different processes).…”

Section: General Background On Magma Migration In the Crustmentioning

confidence: 99%

Magma accumulation and segregation during regional-scale folding: The Holland’s dome granite injection complex, Damara belt, Namibia

Kruger

Kisters

2016

Journal of Structural Geology

View full text Add to dashboard Cite

“…Once melt production commenced (at T~635°C; Figure 5a), η eff declined sharply with increasing M (Figure 5b), until the effective viscosity of the crystal-melt suspension at the base of the heat-producing layer resembled that of a granitic liquid, prior to dome-and-keel formation (η eff~1 0 6 Pa s for M > 0.3 at 3300 Ma; Figure 5b). Although our η eff (T)-M model neglects the obvious possibility of progressive, batchwise melt removal [e.g., Sawyer, 1994;Rutter, 1997;Bons et al, 2004] and the potential for associated "stiffening" of the residual heat-producing layer, it is very likely that the modeled thermal history resulted in a substantially decreased effective viscosity in the Pilbara mid-crust. Dome-and-keel formation may have been initiated by largescale, buoyancy-driven ascent of the crystal-melt suspension, triggering partial convective overturn of the crust [Collins et al, 1998;Van Kranendonk et al, 2002] that was assisted and sustained by the gravitational instability imposed by the overlying 11-17-km-thick greenstone edifice.…”

Section: Q2mentioning

confidence: 99%

Thermal and mechanical controls on the evolution of archean crustal deformation: Examples from Western Australia

Bodorkos

Sandiford

2006

Archean Geodynamics and Environments

View full text Add to dashboard Cite

Dome-and-keel formation in Archean granite-greenstone terrains was uniquely favored by high abundances of heat-producing elements (HPEs) in the crust, and the ubiquity of pre-doming "greenstone-over-granite" stratification, which constituted large-scale density inversions and facilitated long-term steepening of the geotherm via burial of felsic basement-hosted HPEs. This contribution investigates the influence of these factors on the thermo-mechanical stability of the crust, with reference to two contrasting Archean granite-greenstone terrains in Western Australia. In the Neoarchean Eastern Goldfields Province, the rapid (2715-2665 Ma) accumulation of a thin (8-km) greenstone succession atop HPEpoor felsic crust (radiogenic heat flow contribution q c = 45 mW m −2 ) raised midcrustal temperatures from 230°C to 370°C prior to 2650 Ma dome-and-keel formation. In such cold, strong crust, the development of broad, granite-cored antiforms and narrow, greenstone-cored synforms with little strike variation is likely to directly reflect far-field, horizontal tectonic forces, oriented perpendicular to the regional structural grain. In contrast, the Mesoarchean East Pilbara Granite-Greenstone Terrane underwent slow (3515-3325 Ma) accumulation of tick (14-km) greenstones atop HPE-rich (q c = 70 mW m −2 ) basement, which raised mid-lower crustal temperatures from 400°C to 750-800°C, prior to 3300 Ma dome-and-keel formation. The effective viscosity of this hot, weak crust was further reduced by partial melting of the felsic basement; the resulting "classical" architecture (featuring granite domes flanked by greenstone keels with a variety of strike orientations) may therefore reflect partial convective overturn and vertical reorganization of the crust during thermo-mechanical stabilization.

show abstract

Melt extraction and accumulation from partially molten rocks

Cited by 87 publications

References 128 publications

The spatial and temporal patterning of the deep crust and implications for the process of melt extraction

The spatial and temporal patterning of the deep crust and implications for the process of melt extraction

Magma accumulation and segregation during regional-scale folding: The Holland’s dome granite injection complex, Damara belt, Namibia

Thermal and mechanical controls on the evolution of archean crustal deformation: Examples from Western Australia

Contact Info

Product

Resources

About