Tin deposits in the Black Range district

Maxwell, Charles Henry; Foord, Eugene E.; Oakman, Mariel R.; Harvey, D. B.

doi:10.56577/ffc-37.273

Cited by 3 publications

(3 citation statements)

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“…Wood tin and colloform cassiterite have maximum Fe contents of 16% and 27%, respectively (Table 3), well above the maximum 10% Fe reported in wood tin from high-level, topaz-rhyolite-type tin deposits, 41,50,53 which may reflect the strong granitic affiliation at Mount Pleasant, hence with varieties of cassiterite exhibiting a more 'plutonic' geochemical signature. Although Fe enrichment in wood tin has been explained or inferred from its fine intergrowth with hematite, 14,53,58 microprobe scanning of Mount Pleasant wood tin and colloform cassiterite showed no inclusions of hematite. Only in one case has wood tin from densely chloritised-topazified rock at Mount Pleasant been found to occur together with blades of later specularite.…”

Section: Cassiteritementioning

confidence: 75%

“…The enrichment of wood tin and colloform cassiterite in As, Zn and Sb (Table 3) resembles that in wood tin from topaz-rhyolite deposits 53 and from the subvolcanic tin deposit of Dzhalinda, BaikaL, C.E.I., 52 although these elements are somewhat more abundant in cassiterite from the latter deposits. The enrichment of As, Zn and Sb in wood tin from ETZ accords with the latter's formation in a moderately high-level environment, at an interpreted depth of about 1 km.…”

Section: Cassiteritementioning

confidence: 77%

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The endogranitic tin zone, Mount Pleasant, New Brunswick, Canada and its metallogenesis

Inverno¹,

Hutchinson²

2004

Applied Earth Science

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The Mount Pleasant Sn-W-Mo deposits occur within the margin of an eroded caldera underlain by a Devono-Mississippian intrusive-subvolcanic-eruptive complex of granitic, porphyritic and felsic pyroclastic rocks. The separate North and Fire Tower mineralised zones are centred in volcanic necks defined by hydrothermal breccias within this complex. The oldest of three successive granites in both Zones hosts W-Mo mineralisation, whereas the two younger granites in the North Zone contain various Sn deposits. One of these, the endogranitic tin zone, is an irregular but generally tabular body hosted within a distinctive, highly evolved phase of the third, and youngest granite. The endogranitic tin zone was formed by successive stages of sericitisation, chloritisation/topazification-silicification, brecciation, dense chloritisation-topazification and late replacement. It contains quartz, chlorite, topaz, fluorite, cassiterite, arsenopyrite, base metal sulphides, pyrite, stannite, wolframite, native bismuth, molybdenite, kaolinite and carbonates. The ore minerals occur about equally in veinlets and disseminations. Cassiterite was deposited in all stages, but more abundantly during brecciation and particularly during dense chloritisation-topazification where it accompanies a distinctive, avocado-green, Fe-rich chlorite. The host, endogranitic tin zone granite, has undergone significant depletions and enrichments in major and minor elements. Fluid inclusions indicate that the chloritised/topazifiedsilicified rock formed from early, low salinity dominantly meteoric fluids at ~200-225°C. Later, saline, magmatichydrothermal fluids, probably differentiated in the upper part of the endogranitic tin zone granite, mineralised the brecciated and densely chloritised-topazified rocks at similar temperatures. Latest low salinity meteoric fluids formed the late replacement bodies at 175-185°C. Sn was deposited under acidic conditions at oxygen fugacity of 10 -39 -10 -34 atm from dominant SnCl 2 0 and SnF + complexes due to fluid oxidation and neutralisation, and cooling. Endogranitic tin zone cassiterite has a trace element signature that is intermediate between that of cassiterite from deep-seated greisens and pegmatites, and shallower cassiterite-sulphide and Bolivian porphyry-tin ores. The late replacement cassiterite, however, is high in Nb, Ta, Ti and Fe, and thus has a pegmatitic signature. This, together with their size and distribution within the endogranitic tin zone and elsewhere in the complex, suggests that the late replacement bodies are aborted pegmatites formed when the magmatic-hydrothermal fluids became largely diluted by the late meteoric fluids. Wood tin and colloform cassiterite contain abundant Fe, resembling wood tin in the high-level topaz rhyolites and Russian subvolcanic tin deposits. Sphalerite contains abundant In, as do other high-level, stanniferous polymetallic ores. The endogranitic tin zone at Mount Pleasant appears to be unique, differing from both greisen-and porphyry-tin deposits and no close analogues...

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Section: Cassiteritementioning

confidence: 75%

Section: Cassiteritementioning

confidence: 77%

The endogranitic tin zone, Mount Pleasant, New Brunswick, Canada and its metallogenesis

Inverno¹,

Hutchinson²

2004

Applied Earth Science

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“…The tin was in the rhyolite magma and as the lava cools and devitrifies, the tin differentiates into the outer rind of the lava. Four types of tin deposits are found in the altered Oligocene-Miocene rhyolite domes and tuffs in the Taylor Creek district, NM (Correa, 1980;Eggleston, 1983;Maxwell et al, 1986;Eggleston and Norman, 1986): 1) miarolitic cavities within rhyolite, 2) thin veins and veinlets cutting rhyolite, 3) disseminations in rhyolite, and 4) placer deposits in streams and alluvial deposits adjacent to rhyolite domes and flows. Subsequent lowtemperature convection mobilizes them along faults and within permeable tuffs and rhyolites (Burt and Sheridan, 1981;.…”

Section: Taylor Creek District (Dis204) Catron Sierra and Socorro Cou...mentioning

confidence: 99%

Beryllium resources in New Mexico and adjacent areas

McLemore¹

2010

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This information is preliminary and has not been reviewed according to New Mexico Bureau of Geology and Mineral Resources standards. The content of this report should not be considered final and is subject to revision based upon new information. Any resource or reserve data are historical data and are provided for information purposes only and does not reflect Canadian National Instrument NI 43-101 requirements, unless specified as such.

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