Abstract
After more than 35 years of TTG (tonalite-trondhjemite-granodiorite) research, we still face many questions about the origin and tectonic significance of these peculiar rocks. What we do know is that TTGs are similar in composition regardless of age, they have high La/Yb, Sr/Y, Sr and Eu/Eu*, they decrease in abundance relative to calc-alkaline granitoids at the end of the Archean, and they are not made in oceanic arcs, shallow levels of oceanic plateaus or at ocean ridges. Furthermore, oxygen isotopes in TTG zircons require interaction of TTG sources with the hydrosphere, and the existence of Hadean continental crust inferred from detrital zircon suites remains problematic. Although we now realize that TTGs require amphibole and garnet fractionation and sources that are at least 50 km deep, what we do not know are the relative roles of (1) melting versus fractional crystallization and (2) melting of slabs versus melting of thickened mafic crust. The mechanisms and rates of slab dehydration control the stability of garnet and amphibole in subduction zones. From what we know about early Archean greenstones, they are more altered than later ones, and thus they would appear to bring more water and fluid-mobile elements into subduction zones, at least by the late Archean when plate tectonics became widespread. Hotter slabs in the Archean should contribute to higher volatile release rates. This may explain the trace element changes we see in TTGs at the end of the Archean.
To make continental crust today we need to start at a continental subduction zone where we produce both calc-alkaline (CA) and TTG magmas, and combine the felsic components in a ratio of about 3 parts CA to 2 parts TTG. In contrast, to make an Archean continent, we need nearly 100 % of the TTG component, and may begin, at least before about 3 Ga, by melting the roots of oceanic plateaus.
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References
Barker F (1979) Trondhjemites, dacites and related rocks. Elsevier, New York
Bedard JH (2006) A catalytic delamination-driven model for coupled genesis of Archean crust and sub-continental lithospheric mantle. Geochim Cosmochim Acta 70:1188–1214
Bindeman IN, Eiler JM, Yogodzinski GM, Tatsumi Y, Stern CR, Grove TL, Portnyagin M, Hoernle K, Danyushevsky LV (2005) Oxygen isotope evidence for slab melting in modern and ancient subduction zones. Earth Planet Sci Lettr 235:480–496
Bowring SA, Williams IS (1999) Priscoan (4.00-4.03 Ga) orthogneisses from northwestern Canada. Contib Mineral Petrol 134:3–16
Claiborne LL, Miller CF, Wooden JL (2010) Trace element composition of igneous zircon: a thermal and compositional record of the accumulation and evolution of a large silicic batholith, Spirit Mountain, Nevada. Contrib Mineral Petrol 160:511–531
Coldwell B, Clemens J, Petford N (2011) Deep crustal melting in the Peruvian Andes: felsic magma generation during delamination and uplift. Lithos 125:272–286
Coleman RG, Donato MM (1979) Oceanic plagiogranite revisited. In: Barker F (ed) Trondhjemites, dacites and related rocks. Elsevier, Amsterdam, pp 149–168
Condie KC (1993) Chemical composition and evolution of the upper continental crust: contrasting results from surface samples and shales. Chem Geol 104:1–37
Condie KC (2005) TTGs and adakites: are they both slab melts? Lithos 80:33–44
Condie KC (2007) Accretionary orogens in space and time. Geol Soc America Mem 200:145–158
Condie KC (2008) Did the character of subduction change at the end of the Archean? Constraints from convergent-margin granitoids. Geology 36(8):611–614
Condie KC, Chomiak B (1996) Continental accretion: contrasting Mesozoic and Early Proterozoic tectonic regimes in North America. Tectonophys 265:101–126
Condie KC, Kroner A (2008) When did plate tectonics begin? Evidence from the geologic record. Geol Society America Spec Paper 440:281–295
Condie KC, O’Neill C (2010) The Archean-Proterozoic boundary: 500 My of tectonic transition in Earth history. Amer J Sci 310:775–790
Condie KC, Kroner A (2012) The building blocks of continental crust: evidence for a major change in the tectonic setting of continental growth at the end of the Archean. Gondwana Res. doi:10.1016/j.gr.2011.09.011
Coogan LA, Hinton RW (2010) Do the trace element compositions of detrital zircons require Hadean continental crust? Geology 34(8):633–636
Dilek Y, Thy P (2006) Age and petrogenesis of plagiogranite intrusions of the Ankara mélange, central Turkey. Island Arc 15:44–57
Dilek Y, Thy P (2009) Island arc tholeiite to boninitic melt evolution of the Cretaceous Kizildag (Turkey) ophiolite: model for milti-stage early arc-forearc magmatism in Tethyan subduction factories. Lithos 113:68–87
Dilek Y, Furnes H, Shallo M (2008) Geochemistry of the Jurassic Mirdita ophiolite (Albania) and the MORB to SSZ evolution of a marginal basin oceanic crust. Lithos 100:174–209
Defant MJ, Drummond MS (1990) Derivation of some modern arc magmas by melting of young subducted lithosphere. Nature 347:662–665
Drummond MS, Defant MJ (1990) A model for trondhjemite-tonalite-dacite genesis and crustal growth via slab melting: Archean to modern comparisons. J Geophys Res 95:21503–21521
Foley S, Tlepolo M, Vannucci R (2002) Growth of early continental crust controlled by melting of amphibolite in subduction zones. Nature 417:837–840
George R, Turner S, Hawkesworth C, Bacon CR, Nye C, Stelling P, Dreher S (2004) Chemical versus temporal controls on the evolution of tholeiitic and calc-alkaline magmas at two volcanoes in the Alaska-Aleutian arc. J Petrol 45:203–219
Getsinger A, Rushmer T, Jackson MD, Baker D (2009) Generating high Mg-numbers and chemical diversity in tonalite-trondhjemite-granodiorite (TTG) magmas during melting and melt segregation in the continental crust. J Petrol 50:1935–1954
Grimes CB et al (2007) Trace element chemistry of zircons from oceanic crust: a method for distinguishing detrital zircon provenance. Geology 35(7):643–646
Grimes CB, Ushikubo T, John BE, Valley JW (2011) Uniformly mantle-like δ18O in zircons from oceanic plagiogranites and gabbros. Contrib Mineral Petrol 161:13–33
Grove TL, Till CB, Lev E, Chatterjee N, Medard E (2009) Kinematic variables and water transport control the formation and location of arc volcanoes. Nature 459:694–697
Hamada M, Fujii T (2008) Experimental constraints on the effects of pressure and H2O on the fractional crystallization of high-Mg island arc basalt. Contrib Mineral Petrol 155:767–790
Harrison TM (2009) The Hadean crust: evidence from > 4 Ga zircons. Annu Rev Earth Planet Sci 37:479–505
Hastie AR, Kerr AC, McDonald I, Mitchell SF, Pearce JA, Millar IL, Barfod D, Mark DF (2010) Geochronology, geochemistry and petrogenesis of rhyodacite lavas in eastern Jamaica: a new adakite subgroup analogous to early Archean continental crust? Chem Geol 276:344–359
Heilimo E, Halla J, Holtta P (2010) Discrimination and origin of the sanukitoid series: geochemical constraints from the Neoarchean western Karelian Province (Finland). Lithos 115:27–39
Hofmann A, Harris C (2008) Silica alteration zones in the Barberton greenstone belt: a window into subseafloor processes 3.5-3.3 Ga. Chem Geol 257:221–239
Hofmann JE, Munker C, Naeraa T et al (2011) Mechanisms of Archean crust formation inferred from high-precision HFSE systematics in TTGs. Geochim Cosmochim Acta 75:4157–4178
Jagoutz OE, Schmidt ME (2012) The formation and bulk composition of modern juvenile continental crust: the Kohistan arc. Chem Geol 298–299:79–96
Jagoutz OE, Burg JP, Hussain S, Dawood H, Pettke T, Iizuka T, Maruyama S (2009) Construction of the granitoids crust of an island arc part I: geochronological and geochemical constraints from the plutonic Kohistan (NW Pakistan). Contrib Mineral Petrol 158:739–755
John T, Klemd R, Klemme S et al (2011) Nb-Ta fractionation by partial melting at the titianite-rutile transition. Contrib Mineral Petrol 161:35–45
Kamber BS, Ewart A, Collerson KD, Bruce MC, McDonald GD (2002) Fluid-mobile trace element constraints on the role of slab melting and implications for Archean crustal growth models. Contrib Mineral Petrol 144:38–56
Kay RW (1978) Aleutian magnesian andesites: melts from subducted Pacific Ocean crust. J Volcanol Geotherm Res 4:117–132
Kay SM, Mpodozis C, Coira B (1999) Magmatism, tectonism, and mineral deposits of the central Andes. In: Skinner B (ed) Geology and ore deposits of the central andes, vol 7. Society Economic Geologists Special Publication, pp 27–59
Kleinhanns IC, Kramers JD, Kamber BS (2003) Importance of water for Archean granitoid petrology: a comparative study of TTG and potassic granitoids from Barberton Mountain Land, South Africa. Contrib Mineral Petrol 145:377–389
Kovalenko A, Clemens JD, Savatenkov V (2005) Petrogenetic constraints for the genesis of Archean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic shield. Lithos 79:147–160
Leat PT, Larter RD, Millar IL (2007) Silicic magmas of Protector shoal, South Sandwich arc: indicators of generation of primitive continental crust in an island arc. Geol Mag 144:179–190
Martin H (1994) The Archean grey gneisses and the genesis of the continental crust. In: Condie KC (ed) Archean crustal evolution. Elsevier, Amsterdam, pp 205–259
Martin H (1999) Adakitic magmas: modern analogues of Archean granitoids. Lithos 46:411–429
Martin H, Moyen J-F (2002) Secular changes in tonalite-trondhjemite-granodiorite composition as markers of the progressive cooling of Earth. Geology 30:319–322
Martin E, Sigmarsson O (2007) Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajokull, Ljosufjoll and Snaefellsjokull volcanes. Contrib Mineral Petrol 153:593–605
Martin E, Sigmarsson O (2010) Thirteen million years of silicic magma production in Iceland: likes between petrogenesis and tectonic settings. Lithos 116:129–144
Martin E, Martin H, Sigmarsson O (2008) Could Iceland be a modern analogue for the Earth’s early continental crust? Terra Nova 20:463–468
Martin H, Moyen J-F, Rapp R (2010) The sanukitoid series: magmatism at the Archean-Proterozoic transition. Earth Environ Science, Transact Roy Society Edinburgh 100:15–33
Mohan MR, Kamber B, Piercey SJ (2008) Boron and arsenic in highly evolved Archean felsic rocks: implications for Archean subduction processes. Earth Planet Sci Lettr 274:479–488
Moyen J-F (2011) The composite Archean grey gneisses: petrological significance, and evidence for a non-unique tectonic setting for Archean crustal growth. Lithos 123:21–36
Moyen J-F, Stevens G (2006) Experimental constraints of TTG petrogenesis: implications for Archean geodynamics: American Geophysical Union, Geophys. Mon 164:149–175
Muntener O, Kelemen PB, Grove TL (2001) The role of H2O during crystallization of primitive arc magmas under uppermost mantle conditions and genesis of igneous pyroxenites: and experimental study. Contrib Mineral Petrol 141:643–658
Nair R, Chacko T (2008) Role of oceanic plateaus in the initiation of subduction and origin of continental crust. Geology 36(7):583–586
Petford N, Atherton M (1996) Na-rich partial melts from newly underplated basaltic crust: the Cordillera Blanca batholith, Peru. J Petrol 37:1491–1521
Rapp RP, Watson EB (1995) Dehydration melting of metabasalt at 8–32 kbar: implications for continental growth and crust-mantle recycling. J Petrol 36:891–931
Rapp RP, Watson EB, Miller CF (1991) Partial melting of amphibolite/eclogite and the origin of Archean trondhjemites and tonalites. Precambrian Res 51:1–25
Rapp RP, Norman MD, Laporte D, Yaxley GM, Martin H, Foley SF (2010) Continent formation in the Archean and chemical evolution of the cratonic lithosphere: melt-rock reaction experiments at 3–4 GPa and petrogenesis of Archean Mg-diorites. J Petrol 51(6):1237–1266
Richards JP, Kerrich R (2007) Special paper: Adakite-like rocks: their diverse origins and questionable role in metallogenesis. Econ Geol 102:537–576
Rollinson H (2008) Ophiolitic trondhjemites: a possible analogue for Hadean felsic crust. Terra Nova 20:364–369
Rollinson H (2009) New models for the genesis of plagiogranites in the Oman ophiolite. Lithos 112:603–614
Rudnick RL, Gao S (2004) Composition of the continental crust. In: Rudnick RL (ed) Treatise on Geochemistry, Vol 3. Elsevier, Amsterdam, pp 1–64
Samsonov AV, Bogina MM, Bibikova EV, Petrova AYu, Shchipansky AA (2005) The relationship between adakitic, calc-alkaline volcanic rocks and TTGs: implications for the tectonic setting of the Karelian greenstone belts, Baltic shield. Lithos 79:83–106
Shirey SB, Hanson GH (1984) Mantle-derived Archean monzodiorites and trachyandesites. Nature 310:222–224
Shukuno H, Tamura Y, Tani K, Chang Q, Suzuki T, Fiske RS (2006) Origin of silicic magmas and the compositional gap at Sumisu submarine caldera, Izu-Bonin arc, Japan. J Volcanol Geotherm Res 156:187–216
Smith IEM, Worthington TJ, Price RC, Stewart RS, Maas R (2006) Petrogenesis of dacite in an oceanic subduction environment: Raoul Island, Kermadec arc. J Volcanol Geotherm Res 156:252–265
Smithies RH (2000) The Archean tonalite-tondhjemite-granodiorite (TTG) series is not an analogue of Cenozoic adakite. Earth Planet Sci Letters 182:115–125
Smithies RH, Champion DC, Van Kranendonk MJ (2009) Formation of Paleoarchean continental crust through infracrustal melting of enriched basalt. Earth Planet Sci Lettr 281:298–306
Sun SS, McDonough WF (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders AS, Norry MJ (eds) Magmatism in Ocean Basins. Geol Society London, Spec Public 42:313–345
Tatsumi Y, Suzuki T (2009) Tholeiitic vs calc-alkalic differentiation and evolution of arc crust: constraints from melting experiments on a basalt from the Izu-Bonin-Mariana arc. J Petrol 50:1575–1603
Turner SP, Rushmer T (2009) Similarities between mantle-derived A-type granites and voluminous rhyolites in continental flood basalt provinces. Earth Environ Science Trans. Roy Soc Edinburgh 100:1–10
Valley JW et al (2005) 4.4 billion years of crustal maturation: oxygen isotope ratios of magmatic zircon. Contrib Mineral Petrol 150:561–580
Whalen JB, Percival JA, McNicoll VJ, Longstaffe FJ (2002) A mainly crustal origin for tonalitic granitoid rocks, Superior province, Canada: implications for Late Archean tectonomagmatic processes. J Petrol 43:1551–1570
White RV, Tarney J, Kerr AC, Saunders AD, Kempton PD, Pringle MS, Klaver GT (1999) Modification of an oceanic plateau, Aruba, Dutch Caribbean: implications for the generation of continental crust. Lithos 46:43–68
Willbold M, Hegner E, Stracke A, Rocholl A (2009) Continental geochemical signatures in dacites from Iceland and implications for modes of early Archean crust formation. Earth Planet Sci Lettr 279:44–52
Winther KT (1996) An experimentally based model for the origin of tonalitic and trondhjemitic melts. Chem Geol 127:43–59
Zellmer GF, Iizuka Y, Miyoshi M, Tamura Y, Tatsumi Y (2012) Lower crustal H2O controls on the formation of adakitic melts. Geology 10 April 2012. doi:10.1130/G32912.1
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Condie, K. (2014). How to Make a Continent: Thirty-five Years of TTG Research. In: Dilek, Y., Furnes, H. (eds) Evolution of Archean Crust and Early Life. Modern Approaches in Solid Earth Sciences, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7615-9_7
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