A complex magma reservoir system for a large volume intra- to extra-caldera ignimbrite: Mineralogical and chemical architecture of the VEI8, Permian Ora ignimbrite (Italy)

Journal of Volcanology and Geothermal Research

Volumn 306, Issue , 2015, Pages 17-40

  Willcock, M A W ^a   Bargossi, G M ^b   Weinberg, R F ^a   Gasparotto, G ^b   Cas, R A F ^a   Giordano, G ^c   Marocchi, M ^b  

^a MONASH UNIVERSITY   (Australia)

^b UNIVERSITY OF BOLOGNA   (Italy)

^c ROMA TRE UNIVERSITY   (Italy)

Author keywords

Caldera eruption dynamics; Ignimbrite; Intra caldera setting; Northern Italy; Ora caldera; Rhyolite

Indexed keywords

CHEMICAL ANALYSIS; COMPLEX NETWORKS; COMPUTER ARCHITECTURE; CRYSTALS; DEPOSITS; FELDSPAR; IRON COMPOUNDS; MATRIX ALGEBRA; MICA; MINERALS; NETWORK ARCHITECTURE; NIOBIUM; POPULATION STATISTICS; STRATIGRAPHY; TRACE ELEMENTS;

COMPOSITIONAL CHANGES; IGNIMBRITES; MAJOR AND TRACE ELEMENTS; NORTHERN ITALY; ORA CALDERA; RHYOLITE; STRATIGRAPHIC ARCHITECTURE; WEALTH OF INFORMATION;

CERIUM;

CALDERA; IGNIMBRITE; LAVA FLOW; MAGMA CHAMBER; PHENOCRYST; RHYOLITE; VOLCANIC ERUPTION; VOLCANOLOGY;

ITALY;

ORA; PENE;

EID: 84945187491     PISSN: 03770273     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jvolgeores.2015.09.015     Document Type: Article

References (138)

1. Acocella V. Structural Development of Calderas: A Synthesis from Analogue Experiments 2008, Elsevier.
2. Aguirre-Díaz G., Labarthe-Hernañdez G. Fissure ignimbrites: fissure-source origin for voluminous ignimbrites of the Sierra Madre Occidental and its relationship with basin and range faulting. Geology 2003, 31:773-776.
3. Allen S.R., Mcphie J. Phenocryst fragments in rhyolitic lavas and lava domes. J. Volcanol. Geotherm. Res. 2003, 126:263-283.
4. Bachmann O., Bergantz G.W. Rejuvenation of the Fish Canyon magma body: a window into the evolution of large-volume silicic magma systems. Geology 2003, 31:789-792.
5. Bachmann O., Bergantz G.W. Gas percolation in upper-crustal magma bodies as a mechanism for upward heat advection and rejuvenation of silicic crystal mushes. J. Volcanol. Geotherm. Res. 2006, 149:85-102.
6. Bachmann O., Bergantz G.W. Rhyolites and their source mushes across tectonic settings. J. Petrol. 2008, 49:2277-2285.
7. Bachmann O., Dungan M.A., Lipman P.W. Voluminous lava-like precursor to a major ash-flow tuff: low-column pyroclastic eruption of the Pagosa Peak Dacite, San Juan Volcanic Field Colorado. J. Volcanol. Geotherm. Res. 2000, 98:153-171.
8. Bachmann O., Dungan M.A., Lipman P.W. The Fish Canyon magma body, San Juan Volcanic Field, Colorado: rejuvenation and eruption of an upper-crustal batholith. J. Petrol. 2002, 43:1469-1503.
9. Bachmann O., Dungan M.A., Bussy F. Insights into shallow magmatic processes in large silicic magma bodies: the trace element record in the Fish Canyon magma body, Colorado. Contrib. Mineral. Petrol. 2005, 149:338-349.
10. Bargossi G.M., D'Amico C., Segatta G. Vulcaniti Atesine in serie ridotta ad est di Trento. Mineral. Petrogr. Acta 1983, 27:207-219.
11. Bargossi G.M., Mair V., Morelli C., Sapelza A. The Athesian Volcanic District (Bolzano-Trento area): a general outline. Field Trip Book, International Field Conference on 'The Continental Permian of the Southern Alps and Sardinia (Italy), Brescia' 1999.
12. Bargossi G.M., Klötzli U., Mair V., Marocchi M., Morelli C. The Lower Permian Athesian Volcanic Group (AVG) in the Adige valley between Merano and Bolzano: a stratigraphic, petrographic and geochronological outline. 32 IGC Abstract 2004, 187. (1 part 1).
13. Bargossi G.M., Mair V., Marocchi M., Morelli C., Moretti A., Piccin G. A mega volcano-tectonic collapse between Bolzano and Trento during the Lower Permian. Mitt. Österr. Mineral. Ges. 2007, 153:34.
14. Barth S. Calc-alkaline basic to silicic rock suites from the Late Hercynian Atesina-Cima d'Asta volcano-plutonic complex (Southern Alps, N Italy): evidence for the primary magmatic and hydrothermal alteration processes. N. Jb. Mineral. (Abh.) 1994, 168:15-46.
15. Barth S., Oberli F., Meier M., Blattner P., Bargossi G.M., Di Battistini G. Nd-Sr isotope evidence for mantle-crust interaction: a study of the Late Hercynian calc-alkaline Atesina-Cima d'Asta volcano-plutonic complex. N Italy. 29th Int. Geol. Congr 1992, IGC, 2.
16. 16O isotopic evidence from the Late Hercynian Atesina-Cima d-Asta volcano-plutonic complex, northern Italy. Geochim. Cosmochim. Acta 1993, 57:4285-4300.
17. Beddoe-Stephens B., Millward D. Very densely welded, rheomorphic ignimbrites of homogeneous intermediate calc-alkaline composition from the English Lake District. Geol. Mag. 2000, 137:155-171.
18. Berger C., Satir M. New geochemical data for the Permian-Carboniferous Bolzano volcanics (Val Gardena, N-Italy). Eur. J. Mineral. 1991, 3:29. (abstr.).
19. Best M.G., Christiansen E.H. Origin of broken phenocrysts in ash-flow tuffs. Geol. Soc. Am. Bull. 1997, 109:63-73.
20. Best M.G., Christiansen E.H., Blank R.H. Oligocene caldera complex and calc-alkaline tuffs and lavas from the Indian Peak volcanic field, Nevada and Utah. Geol. Soc. Am. Bull. 1989, 101:1076-1090.
21. Best M.G., Christiansen E.H., Deino A.L., Gromme S., Hart G.L., Tingey D.G. The 36-18Ma Indian Peak - Caliente ignimbrite field and calderas, southeastern Great Basin, USA: multicyclic super-eruptions. Geosphere 2013, 9:864-950.
22. Bindeman I.N. The secrets of supervolcanoes: microscopic crystals of volcanic ash are revealing surprising clues about the world's most devastating eruptions. Sci. Am. 2006, 38-43.
23. Birch W.D. The geology of Victoria. Geol. Soc. Aust. Spec. Publ. 2003, 23.
24. Bonin B., Brandlein P., Bussy F., Desmons J., Eggenberger U., Finger F., Graf K., Marro C., Mercolli I., Oberhansli R., Ploquin A., Von Quadt A., Von Raumer J.F., Schaltegger U., Steyrer H.P., Visona D., Vivier G. Late Variscan Magmatic Evolution of the Alpine Basement 1993, Springer-Verlag, Berlin New York.
25. Boynton W.V. Chapter 3: cosmochemistry of the rare earth elements: meteorite studies. Rare Earth Element Geochemistry 1985, Elsevier, Amsterdam. P. Henderson (Ed.).
26. Branney M.J., Kokelaar P. Pyroclastic density currents and the sedimentation of ignimbrites. Geol. Soc. Lond. Mem. 2002, 27:143.
27. Briggs R.M., Gifford M.G., Moyle A.R., Taylor S.R., Norman M.D., Houghton B.F., Wilson C.J.N. Geochemical zonation and eruptive mixing in ignimbrites from the Mangakino volcano, Taupo Volcanic Zone, New Zealand. J. Volcanol. Geotherm. Res. 1993, 56:175-203.
28. Brown S.J.A., Wilson C.J.N., Cole J.W., Wooden J. The Whakamaru group ignimbrites, Taupo Volcanic Zone, New Zealand: evidence for reverse tapping of a zoned silicic magmatic system. J. Volcanol. Geotherm. Res. 1998, 84:1-37.
29. Cas R.A.F., O'Halloran G.J., Long J.A., Vandenberg A.H.M. Middle Devonian to Carboniferous, Melbourne. Geol. Soc. Aust. Spec. Publ. 2003, 23.
30. Cas R.A.F., Giordano G., Marti J. Using the stratigraphic record to understand the nature of caldera collapse (incremental vs catastrophic), the way calderas are constructed, and the contrasting spatial and temporal scales for big and small calderas. IAVCEI Caldera Collapse Workshop 2012. Bolsena, Italy 2012.
31. Cashman K.V., Giordano G. Calderas and magma reservoirs. J. Volcanol. Geotherm. Res. 2014, 288:28-45.
32. Cassinis G., Perotti C.R. A stratigraphic and tectonic review of the Italian Southern Alpine Permian. Palaeoworld 2007, 16:140-172.
33. Cassinis G., Perotti C.R., Ronchi A. Permian continental basins in the Southern Alps (Italy) and peri-Mediterranean correlations. Int. J. Earth Sci. (Geol. Rundsch.) 2012, 101:129-157.
34. Castellarin A., Cantelli L. Neo-Alpine evolution of the Southern Eastern Alps. J. Geodyn. 2000, 30:251-274.
35. Charlier B.L.A., Bachmann O., Davidson J.P., Dungan M.A., Morgan D.J. The upper crustal evolution of a large silicic magma body: evidence from crystal-scale Rb-Sr isotopic heterogeneities in the Fish Canyon magmatic system, Colorado. J. Petrol. 2007, 48:1875-1894.
36. Chesner C.A. Petrogenesis of the Toba Tuffs, Sumatra. J. Petrol. 1998, 39:397-438.
37. Chesner C.A. The Toba Caldera Complex. Quat. Int. 2012, 258:5-18.
38. Christiansen R.L. The Quaternary and Pliocene Yellowstone Plateau Volcanic Field of Wyoming, Idaho, and Montana. U. S. Geol. Surv. Prof. Pap. 2001, 729-G:145.
39. Christiansen E.H. Contrasting processes in silicic magma chambers: evidence from very large volume ignimbrites. Geol. Mag. 2005, 142:669-681.
40. Christiansen R.L., Lipman P.W., Carr W.J., Byers Jr., F.M., Orkild, P.P.& Sargent, K.A. Timber Mountain-Oasis Valley caldera complex of southern Nevada. Geol. Soc. Am. Bull. 1977, 88:943-959.
41. Clemens J.D., Wall V.J. Origin and evolution of a peraluminous silicic ignimbrite suite: the Violet Town Volcanics. Contrib. Mineral. Petrol. 1984, 88:354-371.
42. Cole J.W., Milner D.M., Spinks K.D. Calderas and caldera structures: a review. Earth Sci. Rev. 2005, 69:1-26.
43. D'Amico C., Del Moro A. Permian and Triassic Rb-Sr dating in the Permian rhyodacitic ignimbrites of Trentino (Southern Alps). Rend. Soc. Ital. Mineral. Petrol. 1988, 43:171-180.
44. D'Amico C., Del Moro A., Freddo A., Pardini G. Studio radiometrico delle ignimbriti riolitiche Atesine, Gruppo Superiore. Rend. Soc. Geol. Ital. 1980, 36:703-716.
45. De Silva S.L., Francis P.W. Correlation of large ignimbrites - two case studies from the central Andes of northern Chile. J. Volcanol. Geotherm. Res. 1989, 37:133-149.
46. De Silva S.L., Gosnold W.D. Episodic construction of batholiths: insights from the spatiotemporal development of an ignimbrite flare-up. J. Volcanol. Geotherm. Res. 2007, 167:320-335.
47. De Silva S.L., Zandt G., Trumbell R., Viramonte J.G., Salas G., Jimenez N. Large ignimbrite eruptions and volcano-tectonic depressions in the Central Andes: a thermomechanical perspective. Mechanisms of Activity and Unrest at Large Calderas, 2006, 269:47-63.
48. De Silva S., Salas G., Schubring S. Triggering explosive eruptions - the case for silicic magma recharge at Huaynaputina, southern Peru. Geology 2008, 36:387-390.
49. Druitt T.H., Sparks R.S.J. On the formation of calderas during ignimbrite eruptions. Nature 1984, 310:679-681.
50. Ekren E.B., Anderson R.E., Rogers C.L., Noble D.C. Geology of the northern Nellis A.F.B. Bombing and Gunnery Range, Nye County, Nevada. U. S. Geol. Surv. Prof. Pap. 1971, 651. 91 pages.
51. Ellis B.S., Wolff J.A. Complex storage of rhyolite in the central Snake River Plain. J. Volcanol. Geotherm. Res. 2012, 211-212:1-11.
52. Ellis B.S., Barry T., Branney M.J., Wolff J.A., Bindeman I.N., Wilson R., Bonnichsen B. Petrologic constraints on the development of a large-volume, high temperature, silicic magma system: the Twin Falls eruptive centre, central Snake River Plain. Lithos 2010, 120:475-489.
53. Folkes C.B., De Silva S.L., Wright H.M., Cas R.A.F. Geochemical homogeneity of a long-lived, large silicic system; evidence from the Cerro Galán caldera, NW Argentina. Bull. Volcanol. 2011, 73:1455-1486.
54. Folkes C.B., Wright H.M., Cas R.A.F., De Silva S., Lesti C., Viramonte J.G. A re-appraisal of the stratigraphy and volcanology of the Cerro Galán volcanic system, NW Argentina. Bull. Volcanol. 2011, 73:1427-1454.
55. Francis P.W., O'Callaghan L., Kretschmar G.A., Thorpe R.S., Sparks R.S.J., Page R.N., De Barrio R.E., Gillou G., Gonzalez O.E. The Cerro Galan ignimbrite. Nature 1983, 301.
56. Francis P.W., Sparks R.S.J., Hawkesworth C.L., Thorpe R.S., Pyle D.M., Tail S.R., Mantonvani M.S., McDermott F. Petrology and geochemistry of the Cerro Galan caldera, northwest Argentina. Geol. Mag. 1989, 126:515-547.
57. Freundt A. The formation of high-grade ignimbrites, part I: experiments on high- and low-concentration transport systems containing sticky particles. Bull. Volcanol. 1998, 59:414-435.
58. Fridrich C.J., Mahood G.A. Compositional layering in the zoned magma chamber of the Grizzly Peak Tuff. Geology 1987, 15:299-303.
59. 3 of magma. Geology 2002, 30:347-350.
60. Gaul, A. J. 1995. Geology of the Tolmie Highlands Igneous Complex. Melbourne: Unpublished PhD thesis, Monash University.
61. Gifkins C., Herrmann W., Large R. Altered Volcanic Rocks: A Guide to Description and Interpretation 2005, CODES, Hobart.
62. Girard G., Stix J. Future volcanism at Yellowstone caldera: insights from geochemistry of young volcanic units and monitoring of volcanic unrest. GSA Today Bull. 2012, 22:4-10.
63. Gravley D.M., Wilson C.J.N., Leonard G.S., Cole J.W. Double trouble: paired ignimbrite eruptions and collateral subsidence in the Taupo Volcanic Zone, New Zealand. Geol. Soc. Am. Bull. 2007, 119:18-30.
64. Gregg P.M., De Silva S.L., Grosfils E.B., Parmigiani J.P. Catastrophic caldera-forming eruptions: thermomechanics and implications for eruption triggering and maximum caldera dimensions on Earth. J. Volcanol. Geotherm. Res. 2012, 241-242:1-12.
65. Gudmundsson A. Magma-chamber Geometry, Fluid Transport, Local Stresses and Rock Behaviour during Caldera Collapse Formation 2008, Elsevier.
66. Gudmundsson A. Magma chambers: formation, local stresses, excess pressures, and compartments. J. Volcanol. Geotherm. Res. 2012, 237-238:19-41.
67. Gudmundsson A. Caldera collapses and magma-chamber compartments. IAVCEI Caldera Collapse Workshop, Bolsena, Italy 2012.
68. Gudmundsson M.T., Pedersen R., Vogfjord K., Thorbjarndottir B., Jakobsdottir S., Steinunn R.M.J. Eruption of Eyjafjallajokull Volcano, Iceland. EOS Trans. Am. Geophys. Union 2010, 91:190-191.
69. Hildreth W. The Bishop Tuff: evidence for the origin of compositional zonation in silicic magma chambers. Colorado, Geological Society of America, Special Publication 1979, vol. 180.
70. Hildreth W. Gradients in silicic magma chambers: implications for lithospheric magmatism. J. Geophys. Res. 1981, 86:10153-10192.
71. Hildreth W. Volcanological perspectives on Long Valley, Mammoth Mountain and Mono Craters: several contiguous but discrete systems. J. Volcanol. Geotherm. Res. 2004, 136:169-198.
72. Hildreth W., Moorbath S. Crustal contributions to arc magmatism in the Andes of Central Chile. Contrib. Mineral. Petrol. 1988, 98:455-489.
73. Hildreth W., Wilson C.J.N. Compositional zoning of the Bishop Tuff. J. Petrol. 2007, 48:951-999.
74. Houghton B.F., Wilson C.J.N., Mcwilliams M., Lanphere M.A., Weaver S.D., Briggs R.M., Pringle M.S. Chronology and dynamics of a large silicic magmatic system: Central Taupo Volcanic Zone, New Zealand. Geology 1995, 23:13-16.
75. Huber C., Bachmann O., Dufek J. Crystal-poor versus crystal-rich ignimbrites: a competition between stirring and reactivation. Geology 2012, 40:115-118.
76. Janoušek V., Farrow C.M., Erban V. Interpretation of whole-rock geochemical data in igneous geochemistry: introducing Geochemical Data Toolkit (GCDkit). J. Petrol. 2006, 47:1255-1259.
77. Jellínek A.M., Depaolo D.J. A model for the origin of large silicic magma chambers: precursors of caldera-forming eruptions. Bull. Volcanol. 2003, 65:363-381.
78. John D.A. Tilted middle Tertiary ash-flow calderas and subjacent granitic plutons, southern Stillwater Range, Nevada: cross sections of an Oligocene igneous centre. Geol. Soc. Am. Bull. 1995, 107:180-200.
79. John D.H., Henry C.D., Colgan J.P. Magmatic and tectonic evolution of the Caetano caldera, north-central Nevada: a tilted, mid-Tertiary eruptive centre and source of the Caetano Tuff. Geosphere 2008, 4:75-106.
80. Knight M.D., Walker G.P.L., Ellwood B.B., Diehl J.F. Stratigraphy, paleomagnetism, and magnetic fabric of the Toba Tuffs: constraints on the sources and eruptive styles. J. Geophys. Res. 1986, 91:355-382.
81. Kretz R. Symbols for rock-forming minerals. Am. Mineral. 1983, 68:277-279.
82. Lamonica, C. R. 2012. Studio mineralogico, petrographico e geochimico delle facies ignimbritiche intra- ed extra-calderiche della Formazione di Ora del Gruppo Vulcanico Atesino (Permiano inferiore). Trentino-Alto Adige, Italia. Unpub. thesis, Alma Mater Studiorum University of Bologna, Italy.
83. Larsen B.T., Olaussen S., Sundvoll B., Heeremans M. The Permo-Carboniferous Oslo Rift through six stages and 65millionyears. Episodes 2008, 31:52-58.
84. Le Bas M.J., Le Maitre R.W., Streckeisen A., Zanettin B. Chemical classification of volcanic-rocks based on the total alkali silica diagram. J. Petrol. 1986, 27:745-750.
85. Le Maitre R.W., Bateman P., Dudek A., Keller J., Lameyre Le Bas, M.J., Sabine, P.A., Schmid, R., Sorenson, H., Streckeisen, A., Woolley, A.R.& Zanettin, B. A Classification of Igneous Rocks and Glossary of Terms 1989, Blackwell, Oxford.
86. Le Maitre R.W., Streckeisen A., Zanettin B., Le Bas M.J., Bonin B., Bateman G., Bellieni G., Dudek A., Efremova S., Keller J., Lameyre J., Sabine P.A., Schmid R., Sorenson H., Woolley A.R. Igneous Rocks: A Classification and Glossary of Terms 2002, Cambridge University Press.
87. Lesti C., Porreca M., Giordano G., Mattei M., Cas R.A.F., Wright H.M., Folkes C.B., Viramonte J.G. High-temperature emplacement of the Cerro Galán and Toconquis Group ignimbrites (Puna Plateau, NW Argentina) determined by TRM analyses. Bull. Volcanol. 2011, 73:1535-1565.
88. Lindsay J.M., Schmitt A.K., Trumbull R.B., De Silva S.L., Siebel W., Emmermann R. Magmatic evolution of the La Pacana Caldera System, Central Andes, Chile: compositional variation of two cogenetic, large-volume felsic ignimbrites. J. Petrol. 2001, 42:459-486.
89. Lipman P.W. Caldera-collapse breccias in the San Juan Mountains, Colorado. Geol. Soc. Am. Bull. 1976, 87:1397-1410.
90. Lipman P.W. The roots of ash flow calderas in western North America: windows into the tops of granitic batholiths. J. Geophys. Res. 1984, 89:8801-8841.
91. Lipman P.W. Calderas. Encyclopedia of Volcanoes 2000, Academic Press, San Francisco.
92. Lipman P.W. Incremental assembly and prolonged consolidation of Cordilleran magma chambers: evidence from the Southern Rocky Mountain Volcanic Field. Geosphere 2007, 3:42-70.
93. Lipman P.W., Steven T.A., Mehnert H.H. Volcanic history of the San Juan Mountains, Colorado, as indicated by potassium-argon dating. Geol. Soc. Am. Bull. 1970, 81:2327-2352.
94. MacDonald W.D., Palmer H.C., Deino A.L., Shen P.-Y. Insights into deposition and deformation of intra-caldera ignimbrites, central Nevada. J. Volcanol. Geotherm. Res. 2012, 245-246:40-54.
95. Marocchi M., Morelli C., Mair V., Klötzli U., Bargossi G.M. Evolution of large silicic magma systems: new U-Pb zircon data on the NW Permian Athesian Volcanic Group (Southern Alps, Italy). J. Geol. 2008, 116:480-498.
96. Marti J. Caldera-like structures related to Permo-Carboniferous volcanism of the Catalan Pyrenees (NE Spain). J. Volcanol. Geotherm. Res. 1991, 45:173-186.
97. Marti J. Genesis of crystal-rich volcaniclastic facies in the Permian red beds of the Central Pyrenees (NE Spain). Sediment. Geol. 1996, 106:1-19.
98. Marti J., Geyer A., Folch A., Gottsmann J. A Review on Collapse Caldera Modelling 2008, Elsevier.
99. Maughan L.M., Christiansen E.H., Best M.G., Gromme C.S., Deino A.L., Tingey D.G. The Oligocene Lund Tuff, Great Basin, USA: a very large volume monotonous intermediate. J. Volcanol. Geotherm. Res. 2002, 113:129-157.
100. McCann T. Introduction and Overview 2008, The Geological Society, London.
101. McCann T., Kiersnowski H., Krainer K., Vozarova A., Peryt T.M., Oplustil S., Wetzel A., Boulvain F., Dusar M., Torok A., Haas J., Tait J., Korner F. Permian 2008, Geological Society.
102. McDonough W.F., Sun S.-S., Ringwood A.E., Jagoutz E., Hofmann A.W. Potassium, Rubidium and Cesium in the Earth and Moon and the evolution of the mantle of the Earth. Geochim. Cosmochim. Acta 1992, 56:1,001-1,012.
103. McLaughlin R.J.W. Central Victorian Cauldron Volcanic Province. Geol. Soc. Aust. Spec. Publ. 1988, 5.
104. Mcphie J. Evolution of a non-resurgent cauldron: the Late Permian Coombadjha Volcanic Complex: northeastern New South Wales, Australia. Geol. Mag. 1986, 123:257-277.
105. Morelli C., Bargossi G.M., Mair V., Marocchi M., Moretti A. The Lower Permian volcanics along the Etsch Valley from Meran to Auer. Mitt. Österr. Geol. Ges. 2007, 153:195-218.
106. Morelli C., Bargossi G.M., Marocchi M., Piccin G., Moretti A., Mair V. The Athesian Volcanics: a spectacular example of a caldera complex. 85° Congresso. 85° Congresso SGI, Pisa, Rend. Pisa 2010.
107. Palmer H.C., MacDonald W.D., Gromme C.S., Ellwood B.B. Magnetic properties and emplacement of the Bishop Tuff, California. Bull. Volcanol. 1996, 58:101-116.
108. Pearce J.A., Norry M.J. Petrogenetic implications of Ti, Zr, Zr, Y, and Nb variations in volcanic rocks. Contrib. Mineral. Petrol. 1979, 69:33-47.
109. Pearce J.A., Harris N.B.W., Tindle A.G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. J. Petrol. 1984, 25:956-983.
110. Plant J.A., Whittaker A., Demetriades A., De Vivo B., Lexa J. Geochemical Atlas of Europe Part 1: Background Information, Methodology and Maps 2005, EuroGeoSurveys.
111. Quick J.E., Sinigoi S., Peressini G., Demachi G., Wooden J.L., Sbisà A. Magmatic plumbing of a large Permian caldera exposed to a depth of 25km. Geology 2009, 37:603-606.
112. Rasband W. ImageJ 1.32J ed 2011, National Institutes of Health, USA.
113. Ring U., Richter C. The Variscan structural and metamorphic evolution of the eastern Southalpine basement. J. Geol. Soc. Lond. 1994, 151:755-766.
114. Roche O., Druitt T.H. Onset of caldera collapse during ignimbrite eruptions. Earth Planet. Sci. Lett. 2001, 191:191-202.
115. Rottura A., Del Moro A., Caggianelli A., Bargossi G.M. Petrogenesis of the Monte Croce granitoids in the context of the Permian magmatism of the Southern Alps, Italy. Eur. J. Mineral. 1997, 9:1293-1310.
116. Rottura A., Bargossi G.M., Caggianelli A., Del Moro A., Visona D., Tranne C.A. Origin and significance of the Permian high-K calc-alkaline magmatism in the central-eastern Southern Alps, Italy. Lithos 1998, 45:329-348.
117. Rottura A., Bargossi G.M., Visona D., Tranne C.A. Petrological and geochemical evidence on the origin and significance of the Permian magmatism in the central-eastern Southern Alps, Italy. Mem. Soc. Geol. Ital. 1998, 53:9-21.
118. Ruffini R., Borghi A., Cossio R., Olimi F., Vaggelli G. Volcanic quartz growth zoning identified by cathodoluminescence and EMPA studies. Microchim. Acta 2002, 139:151-158.
119. Schaltegger U., Brack P. Crustal-scale magmatic systems during intracontinental strike-slip tectonics: U, Pb and Hf isotopic constraints from Permian magmatic rocks of the Southern Alps. Int. J. Earth Sci. (Geol. Rundsch.) 2007, 96:1131-1151.
120. Schmincke H.-U. Volcanological aspects of peralkaline silicic welded ash-flow tuffs. Bull. Volcanol. 1974, 38:594-636.
121. Smith R.L., Bailey R.A. The Bandelier Tuff: a study of ash-flow eruption cycles from zoned magma chambers. Bull. Volcanol. 1966, 29:83-104.
122. Smith T.R., Cole J.W. Somers Ignimbrite Formation: Cretaceous high-grade ignimbrites from South Island, New Zealand. J. Volcanol. Geotherm. Res. 1997, 75:39-57.
123. Sparks R.S.J., Walker G.P.L. The significance of vitric-enriched air-fall ashes associated with crystal-enriched ignimbrites. J. Volcanol. Geotherm. Res. 1977, 2:329-341.
124. Sparks R.S.J., Francis P.W., Hamer R.D., Pankhurst R.J., O'Callaghan L.O., Thorpe R.S., Page R. Ignimbrites of the Cerro Galan Caldera, NW Argentina. J. Volcanol. Geotherm. Res. 1985, 24:205-248.
125. Tarling D.H., Hrouda F. The Magnetic Anisotropy of Rocks 1993, Chapman & Hall, London.
126. Timmerman M.J. Timing, geodynamic setting and character of the Permo-Carboniferous magmatism in the foreland of the Variscan Orogen, NW Europe. Geol. Soc. Lond. Spec. Publ. 2004, 223:41-74.
127. Timmerman M.J. Palaeozoic Magmatism 2008, The Geological Society, London.
128. Visoná D., Fioretti A.M., Poli M.E., Zanferrari A., Fanning M. U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps. Swiss J. Geosci. 2007, 100:313-324.
129. Walker G.P.L. Crystal concentration in ignimbrites. Contrib. Mineral. Petrol. 1972, 36:135-146.
130. Wang X., Roberts J., Schmidt P. Flow directions of Carboniferous ignimbrites, southern New England Orogen, Australia, using anisotropy of magnetic susceptibility. J. Volcanol. Geotherm. Res. 2001, 110:1-25.
131. Whitney J.A., Stormer J.C. Mineralogy, petrology, and magmatic conditions from the Fish Canyon Tuff, Central San Juan Volcanic Field. Colorado. J. Petrol. 1985, 26:726-762.
132. Whitney J.A., Stormer J.C. Model for the intrusion of batholiths associated with the eruption of large-volume ash-flow tuffs. Science 1986, 231:483-485.
133. Willcock M.A.W., Cas R.A.F. Primary welding and crystallisation textures preserved in the intra-caldera ignimbrites of the Permian Ora Formation northern Italy: implications for deposit thermal state and cooling history. Bull. Volcanol. 2014, 76:1-16.
134. 3), intra- to extra-caldera, Permian Ora (Ignimbrite) Formation, Southern Alps, Italy. J. Volcanol. Geotherm. Res. 2013, 265:102-126.
135. Willcock M.A.W., Mattei M., Hasalová P., Giordano G., Cas R.A.F., Morelli C. Flow behaviour in the intra-caldera setting: an AMS study of the large (>1290km3) Permian Ora ignimbrite. Geol. Soc. Lond. Spec. Publ. 2014, 396:177-204.
136. Wilson C.J.N., Hildreth W. Assembling an ignimbrite: mechanical and thermal building blocks in the Bishop Tuff, California. J. Geol. 2003, 111:653-670.
137. Wolff J.A., Brunstad K.A., Gardner J.N. Reconstruction of the most recent volcanic eruptions from the Valles caldera, New Mexico. J. Volcanol. Geotherm. Res. 2011, 199:53-68.
138. Wright H.M.N., Folkes C.B., Cas R.A.F., Cashman K.V. Heterogeneous pumice populations in the 2.08-Ma Cerro Galán ignimbrite: implications for magma recharge and ascent preceding a large-volume silicic eruption. Bull. Volcanol. 2011, 73:1513-1533.