Nature and origin of nodular textures in anorthositic cumulates from the East Bull Lake Intrusion, Ontario, Canada

Chubb, P. T.; Peck, D. C.; James, R. S.; Ercit, T. Scott

doi:10.1007/bf01162761

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…For detailed explanation see text. Balk, 1931;McLelland et al, 1994;Chubb et al, 1995;Chen et al, 2013 (Kim et al, 2000;Park et al, 2000Park et al, , 2001…”

Section: 강지훈•이덕선mentioning

confidence: 99%

Formation Process and Its Mechanism of the Sancheong Anorthosite Complex, Korea

Kang¹,

Lee²

2015

Economic and Environmental Geology

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The study area is located in the western part of the Precambrian stock type of Sancheong anorthosite complex, the Jirisan province of the Yeongnam massif, in the southern part of the Korean Peninsula. We perform a detailed field geological investigation on the Sancheong anorthosite complex, and report the characteristics of lithofacies, occurrences, foliations, and research formation process and its mechanism of the Sancheong anorthosite complex. The Sancheong anorthosite complex is classified into massive and foliation types of Sancheong anorthosite (SA), Fe-Ti ore body (FTO), and mafic granulite (MG). Foliations are developed in the Sancheong anorthosite complex except the massif type of SA. The foliation type of SA, FTO, MG foliations are magmatic foliations which were formed in a not fully congealed state of SA from a result of the flow of FTO and MG melts and the kinematic interaction of SA blocks, and were continuously produced in the comagmatic differentiation. The Sancheong anorthosite complex is formed as the following sequence: the massive type of SA (a primary fractional crystallization of parental magmas under high pressure) → the foliation type of SA [a secondary fractional crystallization of the plagioclase-rich crystal mushes (anorthositic magmas) primarily differentiated from parental magmas under low pressure] → the FTO (an injection by filter pressing of the residual mafic magmas in the last differentiation stage of anorthositic magmas into the not fully congealed SA) → the MG (a solidification of the finally residual mafic magmas). It indicates that the massive and foliation types of SA, the FTO, and the MG were not formed from the intrusion and differentiation of magmas which were different from each other in genesis and age but from the multiple fractionation and polybaric crystallization of the coeval and cogenetic magma.

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“…For detailed explanation see text. Balk, 1931;McLelland et al, 1994;Chubb et al, 1995;Chen et al, 2013 (Kim et al, 2000;Park et al, 2000Park et al, , 2001…”

Section: 강지훈•이덕선mentioning

confidence: 99%

Formation Process and Its Mechanism of the Sancheong Anorthosite Complex, Korea

Kang¹,

Lee²

2015

Economic and Environmental Geology

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“…(Fe-Ti ore body: 이하, FTO)를 흔히 배태하고 있으 므로 회장암 내에 FTO 산상은 자원개발 측면에서 매 우 중요한 연구 대상이 되어 왔다 (Balk, 1931;McLelland et al, 1994;Chubb et al, 1995;Owens and Dymek, 2001;Charlier et al, 2007).…”

Section: 있고 마그마의 분화작용과 정치과정에서 철-티탄 광체unclassified

Genetic Relationship and Structural Characteristics of the Fe-Ti Ore Body and the Sancheong Anorthosite, Korea

Kang¹,

Lee²

2014

Economic and Environmental Geology

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It consists of the Precambrian Jirisan metamorphic complex and Sancheong anorthosite complex and the Mesozoic granitoids which intrude them in the Sancheong area, the Jirisan province of Yeongnam massif, Korea. The study area is located in the western part of the stock-type Sancheong anorthosite complex. We performed a detailed fieldwork on the Sancheong anorthosite (SA) and Fe-Ti ore body (FTO) which constitute the Sancheong anorthosite complex, and reinterpreted the origin of FTO foliation and the genetic relationship between them from the foliations, shear zones, occurrences of the SA and FTO. The new structural characteristics between them are as follows: the multilayer structures of FTO, the derived veins of straight, anastomosing uneven types and block structures related to the size reduction of SA, the gradual or irregular boundaries of SA blocks and FTO showing bulbous lobate margins and comb structures, the FTO foliation and linear arrangements of flow occurrence which is not ductile shear deformation, the discontinuous shear zone of SA, the orientation of FTO foliations parallel to the boundaries of SA blocks, the predominance of FTO foliations toward the boundaries of SA blocks and being proportional to the aspect ratio of plagioclase xenocrysts and SA xenoblocks, and the flow folding structures of FTO foliation. Such field evidences indicate that the SA is not fully congealed when the FTO is melt and the fracturing of partly congealed SA causes the derived veins of FTO and the size reduction of SA. Also the gradual or irregular boundaries of SA blocks and FTO result from the mutual reaction between the not fully congealed SA blocks and the FTO melt, and the FTO foliation is a magmatic foliation which was formed by the interaction between the FTO melt and the partly congealed SA blocks. Therefore, these suggest that the SA and FTO are not formed from the intrusion of different magmas in genesis and age but from a coeval and cogenetic magma through multiple fractionation. We predict that the FTO will show an very irregular occurrence injected along irregular fractures, not the regular occurrence like as the intrusive vein and dike. It can be applied to the designing of Fe-Ti mineral resource exploration in this area.

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The early tectono-magmatic evolution of the Southern Province: implications from the Agnew Intrusion, central Ontario, Canada

Vogel¹,

James²,

Keays³

1998

Can. J. Earth Sci.

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The Palaeoproterozoic Southern Province comprises a thick, continental rift related volcanic-sedimentary sequence along the southern margin of the Archaean Superior Province. The Agnew Intrusion (50 km2), which is a member of the East Bull Lake suite of layered intrusions, occurs adjacent to the Superior Province - Southern Province boundary in central Ontario, Canada, and provides an opportunity to examine the early tectono-magmatic evolution of a Palaeoproterozoic rifting event. The Agnew Intrusion is a well-exposed, 2100 m thick, layered gabbronoritic to leucogabbronoritic pluton. It was the product of at least four recognizable, but chemically similar, high-Al2O3 and low-TiO2 magma pulses. Structural data, coupled with excellent stratigraphic correlations between the Agnew Intrusion and other East Bull Lake suite layered intrusions, suggest that these plutons are erosional remnants of one or more sill-like bodies that may originally have formed an extensive, subhorizontal mafic sheet. We argue on the basis of field evidence that the early evolution of the Southern Province was characterized by a large, mantle plume induced magmatic event that gave rise to a Palaeoproterozoic continental flood basalt province. However, the incompatible trace element characteristics of the Agnew Intrusion parental magma (i.e., large ion lithophile and light rare earth element enrichment and high field strength element depletion) are more typical of modern subduction-modified subcontinental lithospheric mantle. Given that this is a prevailing geochemical signature of mafic rocks in the Archaean-Palaeoproterozoic, we suggest that there was a fundamental difference in both the composition and structure between the ancient and more modern mantle. "Subduction-like" geochemical signatures may have been imparted to the entire developing mantle during early Earth differentiation.

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Nature and origin of nodular textures in anorthositic cumulates from the East Bull Lake Intrusion, Ontario, Canada

Cited by 5 publications

References 5 publications

Formation Process and Its Mechanism of the Sancheong Anorthosite Complex, Korea

Formation Process and Its Mechanism of the Sancheong Anorthosite Complex, Korea

Genetic Relationship and Structural Characteristics of the Fe-Ti Ore Body and the Sancheong Anorthosite, Korea

The early tectono-magmatic evolution of the Southern Province: implications from the Agnew Intrusion, central Ontario, Canada

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