chloritoid is crystallised with chlorite, white mica and garnet in chlorite zone metapelites ofthe regional metamorphic rocks of the sanandaj-sirjan metamorphic belt in southern iran. chemistry ofcoexisting minerals is studied using microprobe analysis. application of the chlorite-chloritoidgeothermometry gives temperatures of 515°c and 557°c. the chlorite-garnet fe-mg exchangegeothermometer in...

a r t i c l e i n f o Keywords: Eclogite HP granulite Paired metamorphic belts UHPM UHTM The modern plate tectonics regime is characterized by a duality of thermal environments, one representing the subduction zone and the other representing the arc–backarc or orogenic hinterland. This duality is the hallmark of one-sided (asymmetric) subduction, and the characteristic imprint of one-sided subd...

Based on lithological, structural and geophysical characteristics, the Proterozoic Grenville Orogen of southern Ontario and New York has been divided into domains that are separated from each other by ductile shear zones. In order to constrain the timing of metamorphism, U-Pb ages were determined on metamorphic and igneous sphenes from marbles, calc-silicate gneisses, amphibolites, granitoids, ...

southern Omineca Belt, fieldwork was undertaken in 1987 to examine the geology of the Eagle River fault in the eastem Shuswap Highland. The Eagle River fault is a west-sidedown low-angle normal fault that juxtaposes low to mediumgrade metasedimentary and metavolcanic rocks of the Paleozoic Mount Ida Group atop high-grade gneisses of the Shuswap metamorphic complex (Figure 1-4-1 inset). Regional...

U-Pb and Ar/Ar dates from the Talladega belt, southernmost Appalachians, provide insight into the timing and nature of pre-Alleghanian tectonism in this region. Low-grade metasedimentary rocks of the Talladega belt represent the outermost preserved portions of the southern Laurentian margin, thus recording the earliest orogenic events that affected the margin, in addition to later overprinting ...

Fieldand petrographic studies of the Paleozoic metamorphic rocks of New York City suggest a new interpretation of the stratigraphy and structure of the region and has delineated a number of ductileand brittle faults. The belt of rocks originally lumped together as the Manhattan Schist is now interpreted to consist of three mappable units structurally imbricated by two major ductile faults, the ...

Several relatively thin tectono-metamorphic slices have been recognized in the Cycladic eclogite– blueschist belt, through detailed studies on Ios, Sifnos, Syros, and Tinos. A sequence of distinct metamorphic mineral growth events has been documented. These recur in each tectonic slice, although individual slices are dominated by different events. To constrain the timing of these processes, the...

An exotic block of garnet-bearing schist has been found at the boundary between Early Triassic Takinosawa Unit Nedamo Belt and Jurassic Nakatsugawa Complex North Kitakami Belt, NE Japan. This is only second discovery schists in Belt; previously identified occur early Carboniferous Tsunatori units Belt. The characterized by a mineral assemblage garnet + phengite epidote albite quartz titanite. P...