On Fluids in the Dynamic Earth
Plate, plume and anti-plate tectonics drive the fluid factories in the earth. Whereas water plays a dominant role in subduction zones, collision and rift zones witness the activity of CO2-rich fluids. Paleo-fluid channels can be traced from geologic, petrologic, fluid inclusion and geochemical signature; ongoing fluid activity is defined by seismogenic zones in subduction boundaries. Superplumes, both upwelling and downwelling, exert a major control on the nature and distribution of fluids within the earth. They act as pumps to take water to depth and as gigantic pipes connecting the core to the surface of the earth to transfer volatiles. The entrance of huge volumes of water from late Proterozoic triggered the return flow of CO2 back to the surface by the partial melting or subsolidus decarbonation of the subcontinental carbonated mantle. When a plume hits a carbonated tectosphere, the keel on which continents float, even small amounts of melts generated will be rich in CO2. Rising plumes also bring about thermal and chemical erosion. The magmatic, metasomatic and metamorphic fluid factories have played a major role in the geochemical and tectonic evolution of the earth.
KeywordsFluid Inclusion Subduction Zone Mantle Wedge Lower Mantle Outer Core
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- Komiya T (2007) Material circulation through time: Chemical differentiation within the mantle and secular variation of temperature and composition of the mantle. In: Yuen DA, Maruyama S, Karato S, Windley BF (eds) Superplumes: Beyond Plate Tectonics, Springer, NetherlandsGoogle Scholar
- Maruyama S (1994) Plume tectonics. Geological Society of Japan 100: 24–49Google Scholar
- Santosh M (1992) Carbonic fluids in granulites: cause or consequence? J Geol Soc India 39: 375–399Google Scholar
- Santosh M, Maruyama S, Yamamoto S (2009a). The making and breaking of supercontinents: Some speculations based on superplumes, super downwelling and the role of tectosphere. Gondwana Res (under review)Google Scholar
- Santosh M, Maruyama S, Komiya T, Yamamoto S (2009b) Orogens in the evolving earth: From surface continents to “lost continents” on the Core-Mantle Boundary. (submitted)Google Scholar
- Touret JLR (1985) Fluid regime in Southern Norway: the record of fluid inclusions. In: Tobi AC, Touret JLR (eds) The Deep Proterozoic Crust in the North Atlantic Provinces. Reidel, DordrechtGoogle Scholar
- Tsunogae T, Santosh M, Dubessy J (2008) Fluid characteristics of high-to ultrahigh-temperature metamorphism in southern India: a quantitative Raman spectroscopic study. Precambrian Res 162: 198–221Google Scholar
- Yamamoto S, Senshu H, Rino S, Maruyama S (2009) Granite subduction, are subduction, tectonic erosion and sediment subduction Gondwana Res (under review)Google Scholar