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Emmons Pegmatite

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Journal Article

Tourmaline growth in the border and wall zones of the Emmons pegmatite (Maine, U.S.A.): Evidence for disequilibrium crystallization and boundary layer formation Available to Purchase

Laura M. van der Does, Niels Hulsbosch, Pim Kaskes, Jan Elsen, Philippe Claeys, Philippe Muchez, Mona-Liza C. Sirbescu
Published: 01 April 2024
American Mineralogist (2024) 109 (4): 785–798.
DOI: https://doi.org/10.2138/am-2023-8991
... disequilibrium crystallization at high degrees of undercooling. Experimental studies have revealed the existence of thin boundary layers surrounding the rapidly growing crystals. Here, tourmaline-bearing samples from the outer zones of the Emmons pegmatite (Maine, U.S.A.) are used to examine if a boundary layer...
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View PDF for article title, Tourmaline growth in the border and wall zones of the <span class="search-highlight">Emmons</span> <span class="search-highlight">pegmatite</span> (Maine, U.S.A.): Evidence for disequilibrium crystallization and boundary layer formation
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Add to Citation Manager for Tourmaline growth in the border and wall zones of the <span class="search-highlight">Emmons</span> <span class="search-highlight">pegmatite</span> (Maine, U.S.A.): Evidence for disequilibrium crystallization and boundary layer formation
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Journal Article

An unusual occurrence of two lithiophilite pods with narrow interconnection and two types of rhodochrosite mineralization at the Emmons pegmatite, Oxford Co., Maine Available to Purchase

Alexander U. Falster, William B. Simmons
Published: 30 September 2019
The Canadian Mineralogist (2019) 57 (5): 733–734.
DOI: https://doi.org/10.3749/canmin.AB00007
...Alexander U. Falster; William B. Simmons §   Corresponding author e-mail address : [email protected] © 2019 Mineralogical Association of Canada 2019 Emmons pegmatite lithiophilite ball muscovite rhodochrosite anatexis The Emmons pegmatite is located...
View PDF for article title, An unusual occurrence of two lithiophilite pods with narrow interconnection and two types of rhodochrosite mineralization at the <span class="search-highlight">Emmons</span> <span class="search-highlight">pegmatite</span>, Oxford Co., Maine
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Add to Citation Manager for An unusual occurrence of two lithiophilite pods with narrow interconnection and two types of rhodochrosite mineralization at the <span class="search-highlight">Emmons</span> <span class="search-highlight">pegmatite</span>, Oxford Co., Maine
Journal Article

The core margin zone of the Emmons pegmatite: the directional aspects of ball muscovite Available to Purchase

Alexander U. Falster, William B. Simmons, Karen L. Webber
Published: 30 September 2019
The Canadian Mineralogist (2019) 57 (5): 735–736.
DOI: https://doi.org/10.3749/canmin.AB00008
...Alexander U. Falster; William B. Simmons; Karen L. Webber Fig. 1. Map showing the location of the Emmons pegmatite. Fig. 2. Zoning in the Emmons pegmatite. On the concave part of the ball muscovite core margin is book muscovite which at times is zoned and then shows...
FIGURES
View PDF for article title, The core margin zone of the <span class="search-highlight">Emmons</span> <span class="search-highlight">pegmatite</span>: the directional aspects of ball muscovite
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Journal Article

Tantalowodginite, (Mn 0.5 □ 0.5 )TaTa 2 O 8 , a New Mineral Species from the Emmons Pegmatite, Uncle Tom Mountain, Maine, U.S.A. Available to Purchase

Sarah L. Hanson, Alexander U. Falster, William B “Skip” Simmons, Raymond Sprague, Pietro Vignola, Nicola Rotiroti, Sergio Andó, Frédéric Hatert
Published: 23 October 2018
The Canadian Mineralogist (2018) 56 (4): 543–553.
DOI: https://doi.org/10.3749/canmin.1800009
...Sarah L. Hanson; Alexander U. Falster; William B “Skip” Simmons; Raymond Sprague; Pietro Vignola; Nicola Rotiroti; Sergio Andó; Frédéric Hatert Abstract Tantalowodginite is a new mineral found in the Emmons granite pegmatite dike in Oxford County, Maine, U.S.A. It occurs as anhedral masses (0.5–12...
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View PDF for article title, Tantalowodginite, (Mn 0.5 □ 0.5 )TaTa 2 O 8 , a New Mineral Species from the <span class="search-highlight">Emmons</span> <span class="search-highlight">Pegmatite</span>, Uncle Tom Mountain, Maine, U.S.A.
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Add to Citation Manager for Tantalowodginite, (Mn 0.5 □ 0.5 )TaTa 2 O 8 , a New Mineral Species from the <span class="search-highlight">Emmons</span> <span class="search-highlight">Pegmatite</span>, Uncle Tom Mountain, Maine, U.S.A.
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Polychrome elbaite from the Emmons pegmatite. 9 cm maximum dimension. (Maine Mineral &amp; Gem Museum collection.)

Polychrome elbaite from the Emmons pegmatite. 9 cm maximum dimension. (Main... Available to Purchase

Published: 18 December 2024
Fig. 1. Polychrome elbaite from the Emmons pegmatite. 9 cm maximum dimension. (Maine Mineral & Gem Museum collection.)
Image
Schematic cross section of the Emmons pegmatite showing the internal zonation and asymmetry of the dike. The red, dashed rectangle indicates the sampling location [modified from Hanson et al. (2018)]. (Color online.)

Schematic cross section of the Emmons pegmatite showing the internal zonati... Available to Purchase

Published: 01 April 2024
Figure 2. Schematic cross section of the Emmons pegmatite showing the internal zonation and asymmetry of the dike. The red, dashed rectangle indicates the sampling location [modified from Hanson et al. (2018) ]. (Color online.)
Image
Ana Neiva during a geological excursion to the Emmons pegmatite during PEG 2013 (Maine, EEUU) (Photo credit: Encarnación Roda-Robles).

Ana Neiva during a geological excursion to the Emmons pegmatite during PEG ... Available to Purchase

Published: 08 April 2021
Fig. 4. Ana Neiva during a geological excursion to the Emmons pegmatite during PEG 2013 (Maine, EEUU) (Photo credit: Encarnación Roda-Robles).
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Map showing the location of the Emmons pegmatite.

Map showing the location of the Emmons pegmatite. Available to Purchase

Published: 30 September 2019
Fig. 1. Map showing the location of the Emmons pegmatite.
Image
Zoning in the Emmons pegmatite.

Zoning in the Emmons pegmatite. Available to Purchase

Published: 30 September 2019
Fig. 2. Zoning in the Emmons pegmatite.
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Muscovite chemistry in the core margin region of the Emmons pegmatite showing trends.

Muscovite chemistry in the core margin region of the Emmons pegmatite showi... Available to Purchase

Published: 30 September 2019
Fig. 3. Muscovite chemistry in the core margin region of the Emmons pegmatite showing trends.
Image
Simplified cross-section of the Emmons Pegmatite (modified from Roda-Robles 2013).

Simplified cross-section of the Emmons Pegmatite (modified from Roda-Roble... Available to Purchase

Published: 23 October 2018
Fig. 1. Simplified cross-section of the Emmons Pegmatite (modified from Roda-Robles 2013 ).
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REPRESENTATIVE COMPOSITIONS OF TANTALOWODGINITE AND WODGINITE FROM THE EMMO... Available to Purchase

Published: 23 October 2018
TABLE 2. REPRESENTATIVE COMPOSITIONS OF TANTALOWODGINITE AND WODGINITE FROM THE EMMONS PEGMATITE
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REPERESENTATIVE CHEMICAL COMPOSITION OF TANTALITE-(Mn) FROM THE EMMONS PEGM... Available to Purchase

Published: 23 October 2018
TABLE 3. REPERESENTATIVE CHEMICAL COMPOSITION OF TANTALITE-(Mn) FROM THE EMMONS PEGMATITE
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Binary diagrams for the chemical composition in atoms per formula unit of the different types of Emmons pegmatite tourmaline (n = 642). (Color online.)

Binary diagrams for the chemical composition in atoms per formula unit of t... Available to Purchase

Published: 01 April 2024
Figure 8. Binary diagrams for the chemical composition in atoms per formula unit of the different types of Emmons pegmatite tourmaline (n = 642). (Color online.)
Image
Simplified geological map showing metamorphic zones, structures, and major plutons in Maine, northeastern U.S.A. Yellow rectangle indicates the location of the Oxford County pegmatite field with the Emmons pegmatite marked by the yellow star. CMB: Central Maine Belt, S: Sebago Pluton [modified from (Solar and Tomascak (2009) and Robinson et al. (1998)]. (Color online.)

Simplified geological map showing metamorphic zones, structures, and major ... Available to Purchase

Published: 01 April 2024
Figure 1. Simplified geological map showing metamorphic zones, structures, and major plutons in Maine, northeastern U.S.A. Yellow rectangle indicates the location of the Oxford County pegmatite field with the Emmons pegmatite marked by the yellow star. CMB: Central Maine Belt, S: Sebago Pluton
Image
Plain light (A) and cathodoluminescence (CL) image (B) of zoned and partially resorbed apatite from the Emmons pegmatite, Maine. The white line in the CL image outlines the edge of the crystal.

Plain light (A) and cathodoluminescence (CL) image (B) of zoned and partial... Available to Purchase

Published: 30 September 2019
Fig. 1. Plain light (A) and cathodoluminescence (CL) image (B) of zoned and partially resorbed apatite from the Emmons pegmatite, Maine. The white line in the CL image outlines the edge of the crystal.
Image
Cross-section of a crystal cluster showing a tantalite-(Mn) core (black) with a tantalowodginite middle section (orange-red to deep red) and a wodginite rim (black) exposed in the Emmons pegmatite.

Cross-section of a crystal cluster showing a tantalite-(Mn) core (black) wi... Available to Purchase

Published: 23 October 2018
Fig. 2. Cross-section of a crystal cluster showing a tantalite-(Mn) core (black) with a tantalowodginite middle section (orange-red to deep red) and a wodginite rim (black) exposed in the Emmons pegmatite.
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Ternary diagrams for the classification of tourmaline based on Henry et al. (2011), using the Emmons pegmatite EMPA data from this study (n = 642). The two samples that classify into the X-vacant group on a have a yellow border in b and are foitite instead of schorl. Srl = schorl; Drv = dravite; Elb = elbaite. (Color online.)

Ternary diagrams for the classification of tourmaline based on Henry et al... Available to Purchase

Published: 01 April 2024
Figure 7. Ternary diagrams for the classification of tourmaline based on Henry et al. (2011) , using the Emmons pegmatite EMPA data from this study (n = 642). The two samples that classify into the X-vacant group on a have a yellow border in b and are foitite instead of schorl. Srl = schorl
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The three different textural tourmaline groups that occur in the BZ and WZ of the Emmons pegmatite. The comb texture directly on the contact with the metamorphic host rock (a), the radiating tourmaline (b), and the QTIs both parallel to the c-axis (c) and perpendicular to the c-axis (d). Notice in c the multiple pulses of QTI assemblages and in d how the skeletal tourmaline fully surrounds the central tourmaline. Arrows indicate the direction of growth. (Color online.)

The three different textural tourmaline groups that occur in the BZ and WZ ... Available to Purchase

Published: 01 April 2024
Figure 3. The three different textural tourmaline groups that occur in the BZ and WZ of the Emmons pegmatite. The comb texture directly on the contact with the metamorphic host rock ( a ), the radiating tourmaline ( b ), and the QTIs both parallel to the c -axis ( c ) and perpendicular
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Schematic representation of the evolution of the formation processes of the quartz-tourmaline intergrowths (QTIs) at the Emmons pegmatite. (a) The central tourmaline grows rapidly, forming a boundary layer of excluded, incompatible elements. (b) The boundary layer becomes undersaturated in tourmaline components and crystallization of tourmaline stops. Quartz nucleates on the tourmaline surface and starts to grow. (c) The boundary layer becomes progressively saturated in tourmaline components, but the high concentration of H2O (±Li, B, F, and P) inhibits nucleation and growth of tourmaline, causing higher degrees of undercooling and supersaturation. Eventually, coarse grains of tourmaline will crystallize, competing with quartz and forming the QTIs. For simplicity, individual quartz grains have not been drawn in the intergrowths. Tur2 = Type 2 tourmaline; Tur3 = Type 3 tourmaline; Tur4 = Type 4 tourmaline; BL = boundary layer; Fsp = feldspar; Qz = quartz. (Color online.)

Schematic representation of the evolution of the formation processes of the... Available to Purchase

Published: 01 April 2024
Figure 11. Schematic representation of the evolution of the formation processes of the quartz-tourmaline intergrowths (QTIs) at the Emmons pegmatite. ( a ) The central tourmaline grows rapidly, forming a boundary layer of excluded, incompatible elements. ( b ) The boundary layer becomes