Investigations in the Stillwater Complex: Part II. Petrology and Petrogenesis of the Ultramafic Series

Raedeke, L. D.; McCallum, I. S.

doi:10.1093/petrology/25.2.395

Cited by 162 publications

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“…In the Mountain View area, where the Peridotite zone reaches its greatest thickness, Jackson and others (1954) recognized 15 cyclic units. Raedeke and McCallum (1984) showed 20 cyclic units in the same area.…”

Section: Explanationmentioning

confidence: 90%

“…Therefore, the stratigraphically lowermost A chromitite is not present in M-16, indicating its discontinuous nature even within the relatively small area of the Mountain View block. Another indication that the stratigraphy within cyclic units varies laterally within a small area is the fact that the stratigraphy within M-16 does not exactly correlate with other Mountain View stratigraphic columns shown by Jackson (1968) and Raedeke and McCallum (1984).…”

Section: Description Of the M-16 Drill Corementioning

confidence: 93%

“…Not all cyclic units are ideal, and any one of the layers may be missing. Detailed descriptions of the formation of cyclic units are given by Jackson (1969Jackson ( , 1970, Raedeke (1982), and Raedeke and McCallum (1984). Briefly, each cyclic unit is formed by fractional crystallization, and the crystallization sequence is repeated for successive cyclic units, possibly by the injection and mixing of new batches of magma.…”

Section: Explanationmentioning

confidence: 99%

“…The Stillwater was faulted, tilted, and exposed to erosion before the Middle Cambrian, and further deformation and uplift during the Laramide orogeny brought it to its present position. Detailed descriptions of the Stillwater Complex were given by Hess (1960), Jones and others (1960), Jackson (1961), Page (1977), McCallum and others (1980), Zientek (1983), and Raedeke and McCallum (1984). Zientek and others (1985) reviewed the stratigraphic nomenclature used for units in the Stillwater Complex.…”

Section: Introduction and General Geologymentioning

confidence: 99%

“…It is generally agreed that the Stillwater formed by processes involving fractional crystallization of basaltic magma. Recent work has raised the possibility that the Stillwater Complex may have formed from magmas of two distinct compositions, and magma mixing and double-diffusive convection may have occurred (Lambert, 1982;Raedeke, 1982;Irvine and others, 1983).…”

Section: Introduction and General Geologymentioning

confidence: 99%

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Petrology of chromite-bearing rocks from the lowermost cyclic units in the Stillwater Complex, Montana

Loferski¹,

Lipin²,

Cooper³

1990

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Section: Explanationmentioning

confidence: 90%

Section: Description Of the M-16 Drill Corementioning

confidence: 93%

Section: Explanationmentioning

confidence: 99%

Section: Introduction and General Geologymentioning

confidence: 99%

Section: Introduction and General Geologymentioning

confidence: 99%

See 3 more Smart Citations

Petrology of chromite-bearing rocks from the lowermost cyclic units in the Stillwater Complex, Montana

Loferski¹,

Lipin²,

Cooper³

1990

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The Formation of Stratiform PGE Deposits in Layered Intrusions

Naldrett¹,

Cameron

Gruenewaldt

et al. 1987

Origins of Igneous Layering

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The principle stratiform platinum group element deposits are the Merensky Reef and UG-2 chromitite of the Bushveld and the J-M Reef of the Stillwater Complexes. In the Bushveld Complex, cryptic variation in the MgNo of bronzite and in the An and Sr content of plagioclase within the Merensky cyclic unit, the apparent crossing of the plagioclase cotectic §~ th~6magma reponsible for this and other units, and variations in Sr/ Sr initial ratio, and, in the Stillwater Complex, the change in the order of liquidus phases, point to the involvement of at least two different magmas in each intrusion.In each deposit the PGE are closely associated with base metal sulfides. Despite the presence of volatiles and some evidence of hydrothermal mobilization of PGE in most deposits, it is concluded, from the constancy of sulfide composition within stratigraphie layers and the variability between these layers, that the sulfides and host rocks were deposited simultaneously.It is proposed that the cyclic units are the consequence of periodic influx of new, primitive magma, that the sulfides segregated in response to magma mixing during influx, and that turbulent convection within the influxes gave the sulfides the opportunity to equilibrate with, and thus concentrate PGE from, a very large mass of magma, thus accounting for the high PGE tenor of these deposits. In the case of deposits within massive chromitite, the PGE, Ni and Cu tenors were likely upgraded as a result of the 1055 of FeS. I. Parsons (ed.), Origins ofIgneous Layering, 313-397. © 1987 by D. Reidel Publishing Company. 313 314 A. J. NALDRETT ET AL.

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Laboratory Experiments with Aqueous Solutions Modelling Magma Chamber Processes. I. Discussion of Their Validity and Geological Application

Stephen¹,

Sparks

Huppert

1987

Origins of Igneous Layering

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Investigations in the Stillwater Complex: Part II. Petrology and Petrogenesis of the Ultramafic Series

Cited by 162 publications

References 0 publications

Petrology of chromite-bearing rocks from the lowermost cyclic units in the Stillwater Complex, Montana

Petrology of chromite-bearing rocks from the lowermost cyclic units in the Stillwater Complex, Montana

The Formation of Stratiform PGE Deposits in Layered Intrusions

Laboratory Experiments with Aqueous Solutions Modelling Magma Chamber Processes. I. Discussion of Their Validity and Geological Application

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