New Danburite Locality Discovered in the Town of Macomb, St. Lawrence County, New York

Sutherland, Andrew; Sutherland, Scott; Robinson, Grace; Lupulescu, Marian; Bailey, David G.; Chamberlain, Steven C.

doi:10.1080/00357529.2016.1277924

Cited by 2 publications

(7 citation statements)

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“…The majority of samples fell within the field for Lowlands marble, with two samples (KV, FN) falling between metamorphosed carbonatites and marble. Similar values for δ 13 C-δ 18 O isotopes reported by other investigators [3,6,8] for calcite from geologically similar occurrences in Canada have been interpreted as both silicocarbonatites and marble metasomatized by fluids possibly derived (at least in part) from mantle sources. Comparisons of the silicocarbonate pegmatite samples indicate substantial overlap with marbles from the Adirondack Lowlands [30] and with calcite associated with the Balmat zinc deposits [31] indicated substantial overlap.…”

Section: Carbon and Oxygen Isotopes In Calcitesupporting

confidence: 86%

Section: Carbon and Oxygen Isotopes In Calcitesupporting

confidence: 86%

“…This locality is known as the Downing Farm; Brown [17] first reported minerals of interest. At this locality, the second discovery of danburite in the Adirondacks occurs along the mineralized contact between an albite-quartz pegmatite and marble [18].…”

Section: Lowlands Geochronological Samplesmentioning

confidence: 99%

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Age and Origin of Silicocarbonate Pegmatites of the Adirondack Region

et al. 2019

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Silicocarbonate pegmatites from the southern Grenville Province have provided exceptionally large crystal specimens for more than a century. Their mineral parageneses include euhedral calc–silicate minerals such as amphibole, clinopyroxene, and scapolite within a calcite matrix. Crystals can reach a meter or more in long dimension. Minor and locally abundant phases reflect local bedrock compositions and include albite, apatite, perthitic microcline, phlogopite, zircon, tourmaline, titanite, danburite, uraninite, sulfides, and many other minerals. Across the Adirondack Region, individual exposures are of limited aerial extent (<10,000 m2), crosscut metasedimentary rocks, especially calc–silicate gneisses and marbles, are undeformed and are spatially and temporally associated with granitic pegmatites. Zircon U–Pb results include both Shawinigan (circa 1165 Ma) and Ottawan (circa 1050 Ma) intrusion ages, separated by the Carthage-Colton shear zone. Those of Shawinigan age (Lowlands) correspond with the timing of voluminous A-type granitic magmatism, whereas Ottawan ages (Highlands) are temporally related to orogenic collapse, voluminous leucogranite and granitic pegmatite intrusion, iron and garnet ore development, and pervasive localized hydrothermal alteration. Inherited zircon, where present, reflects the broad range of igneous and detrital ages of surrounding rocks. Carbon and oxygen isotopic ratios from calcite plot within a restricted field away from igneous carbonatite values to those of typical sedimentary carbonates and local marbles. Collectively, these exposures represent a continuum between vein-dyke and skarn occurrences involving the anatexis of metasedimentary country rocks. Those of Ottawan age can be tied to movement and fluid flow along structures accommodating orogenic collapse, particularly the Carthage-Colton shear zone.

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Section: Carbon and Oxygen Isotopes In Calcitesupporting

confidence: 86%

Section: Carbon and Oxygen Isotopes In Calcitesupporting

confidence: 86%

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Age and Origin of Silicocarbonate Pegmatites of the Adirondack Region

et al. 2019

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“…Minor danburite was reported to occur at the McLear pegmatite in the town of Dekalb [18], although this has not been confirmed by more recent studies [19,20]. A third locality was discovered in 2014 in the town of Macomb [21]. Stephen Nightingale photo; previously described in [7].…”

Section: Danburite History and Geologic Settingmentioning

confidence: 99%

“…The recently discovered danburite occurrence in the town of Macomb is approximately 25 km northwest of the Russell locality. Here, a small (~5 m long) zone of danburite mineralization occurs along the contact of a small pegmatite intrusion with the Grenville marble [21]. Crystals of danburite up to 12.5 cm long are associated with albite, calcite, diopside, dravite, marialite, quartz, phlogopite, and minor tremolite, graphite, pyrite, titanite, and zircon [21].…”

Section: Danburite History and Geologic Settingmentioning

confidence: 99%

A Review of Boron-Bearing Minerals (Excluding Tourmaline) in the Adirondack Region of New York State

et al. 2019

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Boron is a biologically important element, but its distribution in the natural environment and its behavior during many geological processes is not fully understood. In most metamorphic and igneous environments, boron is incorporated into minerals of the tourmaline supergroup. In high-grade metamorphic terranes like that of the Adirondack region of northern New York State, uncommon rock compositions combined with unusual and variable geologic conditions resulted in the formation of many additional boron-bearing minerals. This paper reviews the occurrences and geological settings of twelve relatively uncommon boron-bearing minerals in the southern Grenville Province of upstate New York and provides new chemical and Raman spectral data for seven of these minerals. The boron minerals range from relatively simple metal borates (e.g., vonsenite), to chemically complex borosilicates (e.g., prismatine), to a relatively rare borosilicate-carbonate (e.g., harkerite). Some are of primary igneous origin, while others are formed by a variety of prograde and retrograde metamorphic processes or by metasomatic/hydrothermal processes. Most of the boron minerals are formed within, or adjacent to, metasedimentary lithologies that surround the anorthositic massifs of the central Adirondacks. The metasedimentary rocks are thought to be the source of most of the boron, although additional boron isotope studies are needed to confirm this and to constrain the mechanisms of the formation of these unusual minerals.

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New Danburite Locality Discovered in the Town of Macomb, St. Lawrence County, New York

Cited by 2 publications

References 1 publication

Age and Origin of Silicocarbonate Pegmatites of the Adirondack Region

Age and Origin of Silicocarbonate Pegmatites of the Adirondack Region

A Review of Boron-Bearing Minerals (Excluding Tourmaline) in the Adirondack Region of New York State

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