Other localities - Latin America

This is a comprehensive list of alkaline localities in America except Canada, USA, and Brazil, mostly (but not only, don´t underestimate me) taken from the Woolley book (see below), generously given to me for 3 months by Peter G.Seroka - many thanks ! The mineral lists are certainly incomplete, I had to leave out things like „opaques“, and there is some confusion about the feldspar group minerals, which are not always named exactly (“antiperthite“).

N to S:

MEXICO:
Coahuila:
La Cueva: Quartz monzonite, syenites, nepheline syenite. Aegirine, aegirine-augite, amphibole grp., analcime, augite, biotite, calcite, feldspar grp., hornblende, nepheline, olivine, perthite, quartz, riebeckite.
Cerro Aguachile, Cerro Colorado, Cerro Nevado, Picacho: 4 sodic intrusive complexes, syenites. Aegirine, analcime, fluorite, nepheline, quartz, riebeckite.

Chihuahua:
La Perla: Calc-alkaline volcanic rocks, rhyolite. Aegirine, amphibole grp..

Nuevo Leon:
Sombreretillo: 2 intrusions, 4x3 and 6x4km. Syenites, labradorite. Aegirine, aegirine-augite, amphibole grp., analcime, augite, biotite, eudialyte, nepheline, perthite, riebeckite.

Tamaulipas:
Sierra de San Carlos: 130km,2 of laccoliths, plugs and sills of alkaline rocks, e.g. nepheline syenite, pulaskite, pyroxenites. Analcime, amphibole grp., analcime, nepheline, pyroxene grp.
Sierra de Tamaulipas: 50x70km, intrusions of alkaline igneous rocks in carboante sediments. Trahytes, phonolites, nepheline syenites a.o..Aegirine, aenigmatite, amphibole grp., biotite, eudialyte, fayalite, hedenbergite, lavenite, quartz.
Cerro Nopal, Cerro Murcielago: Phonolites. Aegirine, amphibole grp., analcime, biotite, feldspar grp.
Bernal de Horcasitas: Apatite grp., biotite, clinopyroxene, feldspar grp., nepheline, plagioclase.

Nayarit:
Las Navajas: Volcano with alkaline rocks.

Jalisco:
La Primavera: Volcano, rhyolites, peralkaline lavas. Apatite grp., fayalite, ferrohedenbergite, ilmenite, magnetite, quartz, sanidine, zircon.
Colima: Volcano, basanites. Analcime, andesine, anorthoclase, apatite grp., augite, chromite, kalsilite, diopside, labradorite, leucite, magnetite, olivine, phlogopite, sanidine, zeolite grp.

Vera Cruz:
Chicontepec Area: Basanite. Aegirine, analcime, anorthite, augite, bytownite, magnetite, nepheline, olivine.
Palma Sola: Andesites, alkaline olivine basalts. Analcime, andesine, nepheline, olivine, plagioclase.
San Andres-Tuxtla: 50km in diameter, alkali basalts. Nepheline.


DOMINICAN REPUBLIC:
San Juan de la Maguana and Cerro Los Frailes: 85km². Alkali olivine basalts, limburgite. Magnetite, nepheline, olivine, plagioclase, salite.


HAITI:
Saut d´Eau and Thomazéau: Alkaline lavas, nepheline basalts. Analcime, apatite grp., augite, hauyne, ilmenite, magnetite, melilite, nepheline, zeolite grp..


HONDURAS:
Lago Yojoja: Olivine basalts, trachytes. Aegirine, aegirine-augite, ndesine, anorthoclase, magnetite, sanidine, zeolite grp.


COSTA RICA:
Alajuela:
La Garita: Basanite, andesite, ignimbrite. Analcime, augite, biotite, bytownite, labradorite, olivine, plagioclase.

Limon y Cartago:
Rio Reventazon: teschenite sills, alkali basalts, basanites. Aegirine, aegirine-augite, amphibole grp., analcime, andesine, apatite grp., biotite, clinopyroxene, hauyne, nepheline, olivine, plagioclase, salite, zeolite grp.
Rio Chirripo and Fila de Matama: Alkali basalt, basanite, nephelinite.


COLOMBIA:
Vaupes:
San José del Guaviare: 3 nepheline syenite bodies, 200km². Albite, biotite, cancrinite, monazite, nepheline, siderite, titanite, zircon.
Circular Structure: By aerial photography. Possible a carbonatite.

Caqueta:
Cerro Cumare: Nepheline syenite.


VENEZUELA:
Bolivar:
Cerro Impacto: Oval ring, 10km in diameter. Granodiorite, granites, fenites, laterites. Barite, quartz..

Amazonas:
Churuata: 2.5km in diameter. Riebeckite granite, quartz syenite, nepheline syenite. Aegirine, arfvedsonite, bastnaesite, biotite, feldspar grp.,monazite, pyrochlore, riebeckite, sodalite.


ECUADOR:
Sumaco: Olivine basalts. Aegirine-augite, apatite grp., hauyne, hornblende, magnetite, nepheline, olivine, plagioclase, pyroxene grp.


GUYANA:
Kaituma: 70km². Peralklalne quartz syenite, pegmatites. Aegirine, albite, arfvedsonite, betafite, biotite, euxenite, magnetite, microcline, oligoclase, orthite, quartz, samarskite, titanite, uranothorite.
Makarapan: Riebeckite granite. Aegirine, apatite grp., biotite, fluorite, microcline, quartz, riebeckite, titanite, zircon.
Muri Complex and Twareitau: 40km². Nepheline syenites, ijolite, urtite, phonolite. Aegirine-augite, amphibole grp., biotite, cancrinite, microcline, nepheline, sodalite, zircon.


PERU:
Loreto:
Pucallpa: 3 plugs of phonolite, alkali trachyte. Aegirine-augite, albite, amphibole grp., apatite grp., biotite, feldspar grp., melanite, nepheline, sodalite, titanite, zeolite grp., zircon.

Pasco:
Gorgor: Breccia with carbonate rocks, possibly carbonatite.

Junin:
Mitu Group: Alkaline volcanic rocks. Teschenite, basanite.

Puno:
Macusani: Nepheline syenite. Aegirine-augite, analcime, barkevikite, biotite, fedlspar grp., nepheline, sodalite.


BOLIVIA:
Cochabamba:
Cerro San Cristobal: 1.2x0.4km. Albite, amphibole grp., apatite grp., biotite, calcite, cancrinite, orthoclase, sodalite.
Cerro Sapo: Sodalite mining in pre-colonial times ! Carbonatite a.o.. Aegirine, albite, amesite-2H (very beautiful sector-twinned
six-pointed stars, crystals look like green "Star-of-David"), amphibole grp., analcime, ankerite, apatite grp., barite, biotite, cancrinite, chalcopyrite, dawsonite (well-terminated, pale-pink crystals),diopside, galena, hisingerite, nepheline, nordstrandite (pale pinkish crystals), oligoclase, olivine, orthoclase, pyrite, siderite, sodalite, sphalerite.
Quenamari: Foyaite, nepheline syenite. Albite, amphibole grp., analcime, arfvedsonite, biotite, cancrinite, diopside, ferrohornblende, magnetite, molybdenite, nepheline, oligoclase, olivine, orthoclase, riebeckite, sodalite.
Carpacayma: Phonolite. Aegirine, aegirine-augite, amphibole grp., analcime, nepheline, pyroxene grp., sanidine, sodalite.

Tarija:
Rejara: Alkali granite. Riebeckite.

Santa Cruz:
Cerro Manomo: Mesa of 4x6km. Carbonatites, silicified, nepheline syenite. Ankerite, barite, bastnaesite, cerianite, collophane, dahllite, dolomite, franconite, goethite, meta-autunite, monazite, quartz, riebeckite. La-Nd-phosphates and–silicates, REE, Mn, Nb-minerals.
Velasco Alkaline Province: 440km². 14 overlapping rings and elliptical plutons. Carbonatite, granites, syenites, nordmarkite, pulaskite, foyaite. Aegirine, aegirine-augite, amphibole grp., analcime, biotite, eudialyte, hornblende, melanite, monazite, nepheline, perthite, pyrochlore, riebeckite, sodalite.


PARAGUAY:
Alto Paraguay:
Puerto Guarani: Nepheline syenite.
Cerro Boggiani: Nepheline syenite.
Maria Auxiliadora: Nepheline syenite.

Concepcion:
Centurion: Phonolite. Aegirine-augite, andesine, apatite grp., bioite, feldspar grp., magnetite, nosean, olivine, orthoclase, serpentine grp..
Cerro Buenavista: Phonolite.
Chiriguelo: 6km in diameter. Sovite, rodbergite, carbonatite, syenite. Biotite, thorite.
Cerro Sarambi: 5km in diameter, pyroxenite, syenite, phonolite, trachyte, sovite, fenite. Aegirine-augite, apatite grp., lamprophyllite, magnetite, nepheline, strontiochevkinite, tausonite.

Amambay:
Cerro Guazu: Essexite, syenite. Biotite.

Central:
Asuncion Area: 8 plugs of nephelinite. Magnetite, nepheline, olivine, pyroxene grp. Zeolite grp..
Arrua-I: 1.2x1km. Shonkinite, phonolite. Analcime.

Paraguari:
Cerro Vera: Essexitgfe. Analcime, apatite grp., biotite, diopside, feldspar grp., magnetite, nepheline.
Soto-Rugua: Essexite, syenite.
Yarigua-A: Phonolite.
Ybypyte: „Alkaline“ hill.
Canete-Cue: „Alkaline“ hill.
Acahay: Gabbros, syenites, diorites, phonolite. Apatite grp., biotite, nepheline, olivine, orthoclase, plagioclase, pyroxene grp., zircon.
Sapukai: Essexite, phonolite, alkaline lavas, basanitres. Apatite grp., biotite,clinopyroxene, leucite, nepheline, olivine.
Cerro Medina: Phonolite.
San José: „Alkaline“ hill.
Apiragua: Essexite.
Ybytymi: Essexite.

Caaguazu:
Aguapety: Shonkinite. Augite, feldspar grp., nepheline, olivine.

Guaira:
Yataity: Essexite, shonkinite.
Mbocayaty: Plugs of essexite, shonkinite, nepheline syenite. Aegirine-augite, amphibole grp., analcime, augite, biotite, feldspar grp., nepheline.
Caapiitindy: Essexite, shonkinite, syenite.
East of Villarica: 4m thick biotite porphyry dyke. Biotite, feldspar grp., nepheline.

Parana:
Sarambo: Carbonatite. Lamprophyllite, loparite-(Ce), strontiochevkinite, tausonite.


URUGUAY:
Lavalleja:
Cerro Vicheo: Syenite plug.

Maldonado:
Sierra de Animas: Syenites, trachytes.
Pan de Azucar: Nordmarkite, syenite. Albite, arfvedsonite, orthoclase, quartz.


CHILE:
Magellanes:
Cerro Cagual: Essexites, syenitesx. Aegirine-augite, orthoclase.
Cerro Balmaceda: Syenites. Aegirine-augite, albite, arfvedsonite, fayalite, quartz.
Seno Skyring: Labradorite. Albite, magnetite, nepheline, pyroxene grp., serpentine.
Lago Sarmiento: Camptonites.
Alto del Carmen and El Transito Mountain Range: Lamprophyres.
Cartagena Area: Lamporphyres.
Del Salto Pluton, Patagonian Andes, Aisen: syenogranite, alkali feldspat granite. Aegirine, arfvedsontie, augite, astrophyllite, ferrorichterite, pyrochlroe, zektzerite.


ARGENTINA:
Jujuy:
Jujuy: Alkaline dykes. Trachytes, foyaites, syenites. Analcime.

Salta:
Iruya: Tinguaite dyke. Aegirine, amphibole grp., analcime, augite, calcigte, feldspar grp., magnetite, nepheline, riebeckite, sanidine, titanite, zeolite grp.
Los Alisos: Vertical sheet-like intrusion. Alnoite. Aegirine, andradite, apatite grp., calcite, diopside, katophorite, magnetite, olivine, perovskite, phlogopite, serpentine grp..
Los Cobres: 7x3km. Peralkaline granite. Aegirine, albite, amphibole grp., augite, biotite, ferrohastingsite, microcline, pyrochlore, riebeckite.
San Miguel de Tucuman Area: Alkali olivine basalts, monchiquites, essexites. Analcime, biotite, leucite, nepheline, zeolite grp..

Catamarco:
Cerro Aspero: Dyle in granodiorite. Amphibole grp., analcime, magnetite, nepheline, pyroxene grp.

Mendoza:
Paramillo de Uspallata: Phonolite, pegmatitic syenite, nordmarkite. Aegirine, aegirine-augite, nepheline.
Sierra Pintada: Gabbro. Nepheline.
Cordillera Principal: Tephrites, basanites, essexites, bostonites. Analcime, biotite, nepheline, sodalite.

San Luis:
Las Chacras: Alkali basalts (?). Analcime, biotite, magnetite, melilite, natrolite, nepheline, olivine, serpentine grp..
Chajan: Nepheline basalts. Aegirine-augite, analcime, biotite, magnetite, nepheline, olivine, perovskite, pyroxene grp..

Rio Negro:
Sierra de Queupuniyeu: Volcanic province 70x20km. Basanite, olivine basalts, nephelinite, tephrite, phonolite. Aegirine-augite, amphibole grp., analcime, augite, biotite, hornblende, magnetite, nepheline, olivine, perovskite, plagioclase, pyroxene grp..

Chubut:
Rio Chubut Medio: Pantellerites.
Sarmiento: Sill and dykes, teschenites, different syenites. Aegirine, aegirine-augite, analcime, apatite grp., arfvedsonite, augite, biotite, feldspar grp., magnetite, nepheline, olivine, plagioclase, zeolite grp..

Comodore Rivadavia:
Plateau Basalts of 45-47 degr. S: Tholeiites, sanaties, alkali basalts. Leucite, nepheline, sanidine.

Santa Cruz:
Los Antiguos: Teschenite with syenitic differentiation. Aegirine, aegirine-augite, albite, analcime, arfvedsonite, augite, biotite, nepheline, oligoclase, olivine, zeolite grp..
Rio Carbon: Essexites. Analcime, orthoclase.

Patagonia:
Estancia Lote 17. Peridotite, carbonatite, lherzolite, wehrlite. Spinel.


&Suggested reading:
Woolley, A.R.: Alkaline Rocks and Carbonatites of the World. Part 1: North and South America. British Museum (Natural History), London, 1987



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