Orogenic belts

The Thomson project area covers an area of 154,521 km2 and is located in northwestern New South Wales (Figure 1). It contains the Thomson Orogen, one of the most poorly understood orogenic belts in... 

Bimodal post-collision volcano-plutonic complex in the southern rim of the eastern flank of the Mongol-Okhotsk orogenic belt... 

Keywords bimodal complex, collision, orogenic belt Introduction... 

Magma types and their sources in the Earth s history. 2006. Moscow IGEM RAS. Parfenov, L.M., Popeko, L.I., Tomurtogoo, O. 1999. Problems of tectonics of Mongol-Okhotsk orogenic belt. Geology of the Pacific Ocean, 18, 24-43. 

Churchill Province. These are all bounded to the south by Paleoproterozoic and Mesoproterozoic orogenic belts of the Makkovik and Grenville Provinces. Uranium occurs in many parts of the territory, in a wide range of environments, but the most important examples are all located within the Central Mineral Belt (CMB), a loosely-defined area at the intersection of the Main, Churchill, Makkovik and Grenville provinces (Fig. 1). 

Craw, D., Koons, P.O., Horton, T. and Chamberlain, C.P. (2002) Tectonically driven fluid flow and gold mineralisation in active collisional orogenic belts comparison between New Zealand and western Himalaya. Tectonophysics, 348(1-3), 135-53. 

Mulch A, Chamberlain CP (2007) Stable isotope paleoaltimetry in orogenic belts — the silicate record in surface and crustal geological archives. Rev Mineral Geochem 66 89-118 Parsons T, Thompson GA, Sleep NH (1994) Mantle plume influence on the Neogene uplift and extension of the U.S. western Cordillera Geology 22 83-86... 

Stable Isotope Paleoaltimetry in Orogenic Belts -The Silicate Record in Surface and Crustal Geological Archives... 

With the advent of stable isotope paleoaltimetry towards the turn of the millennium the stable isotope and tectonics communities have witnessed an increasing number of isotopic mineral proxies developed to address the long-term topographic histories of orogenic belts and continental plateaus. These proxies include calcite from paleosols (see for example Quade et al. 2007, this volume and references therein), fluvial and lacustrine rocks the phosphate and carbonate component of mammal teeth (Kohn and Dettman 2007, this volume and references therein), smectite and kaolinite from paleosols, weathered sediments and volcanic ashes (e.g., Chamberlain et al. 1999 Takeuchi and Larson 2005 Mulch et al. 2006a) as well as white mica from extensional shear zones and fluid inclusions in hydrothermal veins (e.g., Mulch et al. 

Over the last decade considerable effort of the tectonics community has been directed towards the development of thermomechanical models that describe the collisional history and the internal dynamics of orogenic belts and continental plateaus (e.g., Beaumont et al. 2001, 2004 Koons et al. 2002). These models are commonly tested against thermobarometric, thermochronologic, and geochronologic data. However, by definition, these data sets only provide constraints on rates of rock uplift or exhumation the surface response to tectonic... 

Even though paleoaltimetric data from internal structural elements of orogenic belts and plateaus represent much needed complementary information to those derived from surface deposits or weathering products we caution about the uncritical use of stable isotopic data from deeper Earth environments in paleoaltimetric studies. It is highly desirable to obtain reliable thermometric, structural, and isotopic tracer data before attempting any paleoaltimetric reconstruction in such environments, as uncertainties exist about the fluid pathways and mechanisms responsible for fluid transport into the ductile crust. Maybe more importantly, it is imperative to document that the timing of meteoric water-rock interaction can be dated precisely, especially within thermally and kinematically rapidly evolving tectonic environments such as extensional detachment systems. 

Treves B (1984) Orogenic belts as accretionary prisms the example of the Northern Apennines. Ofioliti 9 577-618... 

Riciputi, L.R. Hendry, J.P. in Geo uids II 97 Contributions to the Second International Conference on Fluid Evolution, Migration, and Interaction in Sedimentary Basins and Orogenic Belts, Hendry, J.P. et al. (eds.), Anthony Rowe Chippenham, U.K., 1997, 331. 

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