Abstract
Mn-rich members of the pyrosmalite-family [(Mn, Fe)8Si6O15(OH, Cl)10], friedelite and schallerite have been identified as rock-forming minerals together with caryopilite, in several metamorphosed carbonate Mn-deposits. The phase assemblages and mineral compositions are described for eight of these localities each of which represents a distinct geologic situation. Friedelite is always Cl-bearing and occurs both as a prograde phase in low-grade metamorphic rocks (Pyrenees, Haute-Maurienne) and as a secondary phase formed by retrogressive replacement of primary anhydrous phases in higher-grade rocks. Schallerite, an Asbearing relative of friedelite, occurs in the greenschist metamorphic deposit of the Ködnitztal (Austria) together with other As-minerals. In these deposits, caryopilite is typically formed during retrograde metamorphism by alteration of, generally anhydrous, Mn-silicates. Based upon these occurrences, a qualitative petrogenetic grid for the system MnO-SiO2-CO2-H2O with the phases friedelite, caryopilite, pyroxmangite/rhodonite, tephroite, rhodochrosite, quartz, CO2, and H2O is proposed. The phase relations imply that Cl- (or As-) free friedelite is not stable in hydrous systems with respect to caryopilite. From the mineral assemblages containing hydrous Mn silicates, waterrich fluids are inferred during the retrograde metamorphic evolution of the investigated deposits. Chemical data for Mn-rich chlorites, which are basically members of the clinochlore-pennantite series which coexist with the pyrosmalite minerals, show the absence of intermediate Mn/Mg ratios. This supports the existence of a miscibility gap as previously hypothesized by other authors.
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References
Abrecht J (1984) Dehydration reactions of inesite, Ca2Mn7-Si10(OH)25H2O. Neues Jahrbuch Mineralogie 84:70–82
Bode S (1979) Geology of the northwestern Apuane Alps between Campo Cecina and Monzone (Northern Tuscany, Italy). Ateneo Parmense Acta Nat 15:3–12
Chopin Ch (1978) Les paragenèses réduites ou oxydées de concentrations manganésifères des “schistes lustrés” de Haute-Maurienne (Alpes franćaises). Bull Mineral 101:514–531
Clark LD (1964) Stratigraphy and structure of part of the Western Sierra Nevada metamorphic belt. US Geol Surv Prof Pap 410, pp 70
Costa UR, Barnett RL, Kerrich R (1983) The Mattagami Lake Mine archean Zn-Cu sulfide deposit, Quebec: hydrothermal coprecipitation of talc and Sulfides in a sea-floor brine pool — Evidence from geochemistry, 18O/16O, and mineral chemistry. Econ Geol 78: 1144–1203
Crerar DA, Namson J, So Chyi M, Williams L, Feigenson MD (1982) Manganiferous cherts of the Franciscan assemblage: I. General geology, ancient and modern analogues, and implications for hydrothermal convection at oceanic spreading centers. Econ Geol 77:519–540
de Capitani C (1983) Petrographische Untersuchungen in der Gegend Furtschel las-Grialetsch (Oberengadin) unter besonderer Berücksichtigung der Manganerz-Vorkommen. Master thesis, University of Bern
Donnay G, Bétournay M, Hamill G (1980) McGillite, a new manganous hydroxychloro-silicate. Can Mineral 18:31–36
Duffield WA, Sharp RV (1975) Geology of the Sierra foot-hills melange and adjacent areas, Amador County, California. US Geol Surv Prof Pap 827, pp 30
Dunn PJ, Peacor DR (1984) Nelenite, a manganese arseno-silicate of the friedelite group, polymorphous with schallerite, from Franklin, New Jersey. Mineral Mag 48:271–275
Dunn PJ, Peacor DR, Nelen JA, Norberg JA (1981) Crystalchemical data for schallerite, caryopilite and friedelite from Franklin and Sterling Hill, New Jersey. Am Mineral 66:1054–1062
Frank W, Höck V, Miller Ch (1987) Metamorphic and tectonic history of the Central Tauern window. In: Flügel HW, Faupl P (ed) Geodynamics of the Eastern Alps. Deuticke, Vienna, pp 34–55
Fromme J (1909) Chemisch-mineralogische Notizen aus dem Radautal. Tschermaks Mineral Petrogr Mitt 28:305–333
Garrels RM, Christ CL (1965) Solutions, minerals, and equilibria. Freeman, Cooper and Company, San Francisco
Giglia G, Radicati di Brozolo F (1970) K/Ar age of metamorphism in the Apuane Alps (Northern Tuscany). Boll Soc Geol Ital 89:485–497
Gramaccioli CM, Griffin WL, Mottana A (1980) Tiragalloite, Mn4[AsSi3O12(OH)], a new mineral and the first example of arsenatotrisilicate. Am Mineral 65:947–952
Guggenheim S, Eggleton RA (1988) Crystal chemistry, classification, and identification of modulated layer silicates. In: Bailey SW (ed) Hydrous phyllosilicates. Rev Mineral 19:675–725
Guggenheim S, Bailey SW, Eggleton RA, Wilkes P (1982) Structural aspects of greenalite and related minerals. Can Mineral 20:1–18
Haage R (1964) Beitrag zur Petrographie des Kieselschiefer-Mangan-Kieselvorkommens im Schävenholz bei Elbingerode (Harz). Wiss Z Univ Halle-Wittenbg Jg XIII 3:215–226
Hazen RM, Wones DR (1972) The effect of cation substitutions on the physical properties of trioctahedral micas. Am Mineral 57:103–129
Hewett DF, Chesterman CW, Troxel BW (1961) Tephroite in California manganese deposits. Econ Geol 56:39–58
Hsu LC (1968) Selected phase relationships in the system Al-Mn-Fe-Si-O-H: A model for garnet equilibria. J Petrol 9:40–83
Huebner JS (1967) Stability relations of minerals in the system Mn-Si-C-O. PhD thesis, Johns Hopkins University, Baltimore
Huebner JS, Flohr MJK, Matzko JJ (1986a) Origin and metamorphism of manganese sediments in melange of the Franciscan Complex, California. Abstr IMA-Meeting Stanford 1986:131
Huebner JS, Flohr MJK, Jones BF (1986b) Origin of Mn protore, Franciscan Complex, CA. Geol Soc Am Abstr 18:642
Iijima S (1982) High-resolution electron microscopy of McGillite. I. One-layer monoclinic structure. Acta Cryst A38:685–694
Kato T, Takeuchi Y (1983) The pyrosmalite group of minerals. I. Structure refinement of manganpyrosmalite. Can Mineral 21:1–6
Kligfield R, Hunziker J, Dallmeyer RD, Schamel S (1986) Dating of deformation phases using K-Ar and 40Ar/39Ar techniques: results from the Northern Apennines. J Struct Geol 8:781–798
Koritnig S (1972) Pyroxmangit von Dürnstein, Steiermark und von St Leonhard, Saualpe/Ktn. Karinthin 66:263–266
Krylatov S (1963) Note préliminaire sur les jaspes dinantien des Pyrénées et leur cortège. Bull Soc Geol France 7:393–400
Lougnon J (1956) Rapport général sur les gisements de manganèse en France. Congrès Géol Int Mexico XX Sess, Symposium on manganese deposits 5:63–172
Neinavaie MH (1979) Schichtgebundene Metallanreicherungen in den Schieferhüllen und in der Matreier Zone Osttirols. PhD thesis, Innsbruck
Ozawa T, Takeuchi Y, Takahata T, Donnay G, Donnay GDH (1983) The pyrosmalite group of minerals. II. The layer structure of McGillite and friedelite. Can Mineral 21:7–17
Peacor DR, Essene EJ (1980) Caryopilite — a member of the friedelite rather than the serpentine group. Am Mineral 65:335–339
Pélissonier H (1956) Charactère syngénétique du manganèse des Hautes Pyrénées. Congrès Géol Int Mexico XX Sess, Symposium on manganese deposits 5:173–196
Perseil EA (1968) Contribution à la métallogénie du manganèse dans la France méridionale. Thèse d'Etat, Toulouse
Perseil EA (1971) Les minéralisations manganésifères des Hautes-Pyrénées. Minéralogie et métallogénie. Bull Soc Hist Nat Toulouse 107:503–533
Peters T, Valarelli JV, Candia MAF (1974) Petrogenetic grids from experimental data in the system Mn-Si-C-O-H. Rev Bras Geosci 4:15–26
Pienaar HS (1982) Gem-quality friedelite from the Kalahari manganese field near Kuruman, South Africa. Gems Gemol 82:221–224
Schwander H, Gloor F (1980) Zur quantitativen Mikrosondenanalyse von geologischen Proben mittels kombiniertem EDS/WDS. X-Ray Spectrom 9:134–137
Schreyer W, Fransolet A-M, Abraham K (1986) A miscibility gap in trioctahedral Mn-Mg-Fe chlorites: Evidence from the Lienne Valley manganese deposit. Ardennes, Belgium. Contrib Mineral Petrol 94:333–342
Takeuchi Y, Ozawa T, Takahata T (1983) The pyrosmalite group of minerals. III. Derivation of polytypes. Can Mineral 21:19–27
Taliaferro NL, Hudson FS (1943) Genesis of the managenese deposits of the Coast Ranges of California. Calif Div Mines Geol Bull 125:217–276
Trask PD (1950) Geologic description of the manganese deposits of California. Calif Div Mines Geol Bull 152
Trask PD, Wilson IF, Simons FS (1943) Manganese deposits of California — a summary report. Calif Div Mines Geol Bull 125:51–216
Vaughn JP (1987) Ferropyrosmalite and nomenclature in the pyrosmalite series. Mineral Mag 51:174
Williams PJ, Manby GM (1987) Syngenetic sulfides and Fe-Mn metasediments in middle to upper paleozoic sequences of Karnten, Southern Austria. Econ Geol 82:1070–1076
Winter GA, Essene EJ, Peacor DR (1983) Mn-humites from Bald Knob, North Carolina: mineralogy and phase equilibria. Am Mineral 68:951–959
Zwart HJ (1979) The geology of the Central Pyrenees. Leidse Geol Mededel 50:1–74
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Abrecht, J. Manganiferous phyllosilicate assemblages: occurrences, compositions and phase relations in metamorphosed Mn deposits. Contr. Mineral. and Petrol. 103, 228–241 (1989). https://doi.org/10.1007/BF00378509
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DOI: https://doi.org/10.1007/BF00378509