Anomalous leads and the emplacement of lead sulfide ores

Stanton, R. L.; Russell, Rick

doi:10.2113/gsecongeo.54.4.588

Cited by 106 publications

(24 citation statements)

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“…They exhibit extreme uniformity in the Pb-isotope composition and, as developed by Stanton and Russell (1959), the leads from the conformable deposit, which suffer no detectable contamination with crustal radiogenic Pb, may indicate the age of the sediments enclosing them. The very model-dependent Pb age of 1665 Ma for the galena samples approximately correlates with the closing time of sedimentation (1700 Ma) of the Gangpur series.…”

Section: Resultsmentioning

confidence: 99%

Sargipali galenas: Unusual lead-isotope data from eastern India

Vishwakarma

Ulabhaje

1991

Mineral. Deposita

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Abstract. The Sargipali sulphide deposit, hosted by a sequence of metasediments of the Precambrian Gangpur Series, represents the stratiform and stratabound Pb-Cu mineralization. Lead-isotope analyses obtained from six galena samples of different forms and stratigraphical levels, yielded a model Pb age of 1665 Ma, which predates the episodes of deformation and metamorphism (~850 Ma) as well as syn-to late-tectonic magmatism. The model Pb age, on the contrary, shows a relationship to the closing phase of the Gangpur sedimentation (1700 Ma) in a shallow-water marine environment. The notable paucity of the interlayered volcanic rock in the deposit and its Pb-rich nature possibly point to its being the sedimentary exhalative (SEDEX) type. Documentary evidence for the Pb component from the geological environment of the "upper continental crust" is revealed by an exceptionally high/~(= 23sU/2~ and the slightly above average W(= 132Th/238U) values. These indicate that the source rock was initially rich in U-Th-Pb concentration. For the Sargipali ore Pb, the parent is assumed to be late Archean-lower Proterozoic soda granite.

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Section: Resultsmentioning

confidence: 99%

Sargipali galenas: Unusual lead-isotope data from eastern India

Vishwakarma

Ulabhaje

1991

Mineral. Deposita

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“…At about the same time, i.e., in the late 1950s, detailed studies of the microstructures of ores from the mines of the Brunswick Mining and Smelting Corporation (Stanton, 1959) showed that the basic influence in the development of stratiform ore textures was diagenetic-metamorphic grain growth and the requirements of a sulfide-oxide-silicate crystalloblastic series. That is, metamorphism in its principal role began to be seen as constituting the earliest, primary, influence in the development of microstructures as we now saw it, not a secondary influence simply modifying something that went before (cf.…”

Section: Among the First To Begin Systematic Exploration In The Bathumentioning

confidence: 99%

“…It was noted (Stanton, 1959) that: "much of the ore of these two Bathurst deposits may have assumed its present form in the same way and at the same time as the enclosing schists--during and as a result of diagenesis and low-grade metamorphism. If the shale and tuffaceous shale parents of the present schists contained unusual quantities of sedimentary sulphide--as a cryptocrystalline mixed precipitate--these, with compression and heating, may well have begun to crystallize, coarsen and segregate contemporaneously with the non-opaques.…”

Section: Among the First To Begin Systematic Exploration In The Bathumentioning

confidence: 99%

Observations on the Appalachian-Caledonide ore province and their influence on the development of stratiform ore genesis theory; a short historical review

Stanton¹

1984

Economic Geology

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Scientific investigation of the Appalachian-Caledonide stratiform ores began more than 160 years ago and since that time has had an important influence on ideas concerning the nature, derivation, and mode of deposition of such ores all over the world.The layered and conformable nature of some of the Norwegian ores had been recognized by 1820 and of the Ducktown, Tennessee, deposits by 1855. The probable volcanosedimentary (i.e., exhalative) identity of the Norwegian deposits had been recognized by 1873, and the fact that most of the Appalachian stratiform ores had been regionally metamorphosed was established by 1909.These early prognostications were overwhelmed by the "late-stage structurally controlled hydrothermal replacement" school between about 1900 and 1955. However, exhalativesedimentary ideas began to reappear about 1956. Since that time, and largely as a result of the stimulus provided by the great discoveries in the Canadian Appalachians in the 1950s, understanding of the stratiform ore province of the Appalachian-Caledonide orogen, and of similar orogens and ores elsewhere, has advanced with great rapidity. This has involved not only the ores themselves but also their environments and has led to a much greater appreciation of the ores as petrogenetic entities in their own right and of their place and significance in crustal evolution. This in turn has led to a greatly increased sophistication in stratiform ore exploration technique.

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“…The nature and origin of the Geco mineralization and its environment has been investigated fairly extensively since discovery in 1954 (Pye, 1957;Stanton and Russell, 1959;Timms and Marshall, 1959 The material of present concern, which for the time being may be referred to as "the unknown," occurs as single anhedral grains and aggregates up to ca. 2.0 mm in largest dimension.…”

Section: The Geco Depositmentioning

confidence: 99%

The direct derivation of cordierite from a clay-chlorite precursor; evidence from the Geco Mine, Manitouwadge, Ontario

Stanton

1984

Economic Geology

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A pale creamy yellow substance, apparently similar to material observed by von Eckermann (1936) in cordierite-bearing rocks in Sweden and by Mathias (1952) in similar rocks of South Africa, has been observed in drill core from the Geco mine, Manitouwadge, Ontario.Detailed electron microprobe analysis shows the substance to contain 12 to 15 percent total H20 but otherwise to have a composition reminiscent of cordierite. Limited X-ray diffraction results, together with the compositional data, suggest that the material is a close approximation of an iron-rich sudoite, an aluminous, Mg-bearing, substantially dioctahedral chlorite known since 1964 as a common component of Kuroko ore environments.Contrary to the assumption by the earlier investigators that the yellow material was an alteration product of cordierite, it is suggested here that, at least in the case of Geco, it represents an earlier formed substance from which cordierite has arisen. It is proposed that a sudoite-like material is formed by hydrothermal sedimentation-alteration-diagenesis during and closely following exhalative ore formation. As such, it is an accompaniment and result of the ore-forming process and is localized in the ore environment. With the onset and progress of metamorphism the aluminous chlorite is converted to cordierite, which in consequence is also localized in the ore environment as observed at Noranda and many other exhalative ore localities.Hence it is proposed that at least some cordierite may be derived directly and essentially isochemically from a sudoitic, substantially dioctahedral, chlorite precursor. As such, this cordierite is a manifestation and, later, an indicator, of paleohydrothermal activity, and hence is a potential guide to exhalative ore.

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Anomalous leads and the emplacement of lead sulfide ores

Cited by 106 publications

References 0 publications

Sargipali galenas: Unusual lead-isotope data from eastern India

Sargipali galenas: Unusual lead-isotope data from eastern India

Observations on the Appalachian-Caledonide ore province and their influence on the development of stratiform ore genesis theory; a short historical review

The direct derivation of cordierite from a clay-chlorite precursor; evidence from the Geco Mine, Manitouwadge, Ontario

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