TY  - JOUR
A1  - Dorani, Maryam
A1  - Arvin, Mohsen
A1  - Oberhänsli, Roland
A1  - Dargahi, Sara
T1  - P-T evolution of metapelites from the Bajgan complex in the Makran accretionary prism, south eastern Iran
JF  - Chemie der Erde : interdisciplinary journal for chemical problems of the geo-sciences and geo-ecology = Geochemistry
N2  - The Bajgan Complex, one of the basement constituents of the arc massif in Iranian Makran forms a rugged, deeply incised terrain. The complex consists of pelitic schists with minor psammitic and basic schists, calc silicate rocks, amphibolites, marbles, metavolcanosediments, mafic and felsic intrusives as well as ultramafic rocks. Metapelitic rocks show an amphibolite facies regional metamorphism and contain garnet, biotite, white mica, quartz, albite ± rutile ± apatite. Thermobarometry of garnet schist yields pressure of more than 9 kbar and temperatures between 560 and 675 °C. The geothermal gradient obtained for the peak of regional metamorphism is 19 °C/km, corresponding to a depth of ca. 31 km. Replacement of garnet by chlorite and epidote suggest greenschist facies metamorphism due to a decrease in temperature and pressure through exhumation and retrograde metamorphism (370–450 °C and 3–6 kbar). The metapelitic rocks followed a ‘clockwise’ P–T path during metamorphism, consistent with thermal decline following tectonic thickening. The formation of medium-pressure metamorphic rocks is related to presence of active subduction of the Neotethys Oceanic lithosphere beneath Eurasia in the Makran.
KW  - Bajgan Complex
KW  - Makran
KW  - Metapelitic rock
KW  - Garnet schist
KW  - Thermobarometry
KW  - Clockwise P-T path
Y1  - 2017
U6  - https://doi.org/10.1016/j.chemer.2017.07.004
SN  - 0009-2819
SN  - 1611-5864
VL  - 77
IS  - 3
SP  - 459
EP  - 475
PB  - Elsevier
CY  - Amsterdam
ER  -