Mendeley
TY  _  JOUR
ID  -  13980505191071
TI  -  Tectono-magmatic setting of diabase and basalt flows in north Makran ophiolite, southeast of Iran
JO  -  Iranian Journal of Geology
JA  -  ES
LA  -  fa
SN  -  1735-7128
AU  -  Bazzi Azizollah
AU  -  Khatib Mohammad Mahdi
AU  -  Zarrinkoub Mohammadhosein
AD  -  دانشگاه بیرجند
AD  -  دانشگاه بیرجند
AD  -  دانشگاه بیرجند
Y1  -  2020
PY  -  2020
VL  -  55
IS  -  
SP  -  67
EP  -  79
KW  -   North Makran ophiolite
KW  -   Tholeiite
KW  -   Basalt flows
KW  -   Diabase
KW  -   Calc-alkaline.
DO  -  
N2  -  The north Makran ophiolite in southeast of Iran, as a part of Tethyan ophiolites, is located between Lut and Bajkan-Durkan continental blocks. Among the rocks of this ophiolite sequence, diabase and basalt flows are present more abundant in the outcrops in the eastern part of the studied north Makran ophiolite. Structural, petrographic and geochemical evidences suggest distinct geodynamic setting for the formation of these rocks. Based on geochemical characteristics, diabase and basalts fall into two groups: In the first group, tholeiitic diabase and basalt flows represent MORB-like affinity, and the second group include calc-alkaline basaltic to dacitic lavas with arc environment and supra-subduction affinities. These two lava types represent two major magmatic events: 1) MORB-type magmatism resulted from Early Cretaceous rifting/opening between two continental blocks and resulted in the formation of tholeiitic diabase and basalt. LREE enrichment, low La/Yb and relatively high U/Th ratios suggest continental influence in their melt source, and 2) subduction-related magmatism, that formed calc-alkaline basaltic, andesitic and dacitic lavas in Late Cretaceous. LILE, LREE enrichment, Nb and Ta negative anomaly, low TiO2 concentrations and relatively high Ce/Pb ratio document subduction influence in their composition.


UR  - rimag.ir/en/Article/9878
L1  - rimag.ir/en/Article/Download/9878
ER  -  
