MINERAL CHEMISTRY, THERMOBAROMETRY AND TECTONOMAGMATIC SETTING OF LATE-CRETACEOUS VOLCANIC ROCKS FROM THE KOJID AREA (SOUTH OF LAHIJAN, NORTHERN ALBORZ)

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DELAVARI MORTEZA; Moradi Razieh; TABBAKH SHABANI AMIR ALI

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Journal: PETROLOGY Year:2018 | Volume:9 | Issue:33 Page(s): 133-164

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Title

MINERAL CHEMISTRY, THERMOBAROMETRY AND TECTONOMAGMATIC SETTING OF LATE-CRETACEOUS VOLCANIC ROCKS FROM THE KOJID AREA (SOUTH OF LAHIJAN, NORTHERN ALBORZ)

Author(s)

DELAVARI MORTEZA | Moradi Razieh | TABBAKH SHABANI AMIR ALI | Issue Writer Certificate

Keywords

MINERAL CHEMISTRYQ1

THERMOBAROMETRYQ1

BASALTQ2

CRETACEOUSQ2

ALBORZQ2

Abstract

The volcanic rocks of the Kojid area (south of Lahijan) crop out in northern ALBORZ. They show mainly pillow structure with numerous crosscutting dykes. Based on lithostratigraphic relationships and interpillow pelagic limestones, the volcanics are Late CRETACEOUS in age. The volcanics of the Kojid area are predominantly basic in composition (olivine BASALT and BASALT) and minor more evolved suites such as trachyandesite and dacite. Olivine phenocrysts display forsterite (Fo) content of 63 to 83%. The phenocrystic and interstitial clinopyroxene crystals are augite to diopside in composition, with Na2O, Al2O3 and TiO2 contents of 0.24-0.68, 2.3-6.53 and 1-5.1 wt.%, respectively. Furthermore, the plagioclase is labradorite (An%=51-68). The results of various geothermobarometric methods of the clinopyroxene, the plagioclase and the olivine indicate good correlation with each other. Different thermometric calculations yielded temperatures in the range of 1100 to 1250oC, which are compatible with temperatures of basic melts. Moreover, the clinopyroxene and the plagioclase barometry of the phenocrysts (4 to 8 Kb) and interstitial phases (<5 Kb) correlates with mid- to lower and upper crustal depths, respectively. On the basis of the clinopyroxene chemistry, the composition of the melts is alkaline BASALTs formed in an intra-plate (intra- continental rift) tectonomagmatic setting. The high volume of Late- CRETACEOUS volcanics of northern ALBORZ is probably related to a significant mantle thermal perturbation associated with asthenosphere upwelling and hot spot/plume activity.

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APA: Copy

DELAVARI, MORTEZA, Moradi, Razieh, & TABBAKH SHABANI, AMIR ALI. (2018). MINERAL CHEMISTRY, THERMOBAROMETRY AND TECTONOMAGMATIC SETTING OF LATE-CRETACEOUS VOLCANIC ROCKS FROM THE KOJID AREA (SOUTH OF LAHIJAN, NORTHERN ALBORZ). PETROLOGY, 9(33 ), 133-164. SID. https://sid.ir/paper/196968/en

Vancouver: Copy

DELAVARI MORTEZA, Moradi Razieh, TABBAKH SHABANI AMIR ALI. MINERAL CHEMISTRY, THERMOBAROMETRY AND TECTONOMAGMATIC SETTING OF LATE-CRETACEOUS VOLCANIC ROCKS FROM THE KOJID AREA (SOUTH OF LAHIJAN, NORTHERN ALBORZ). PETROLOGY[Internet]. 2018;9(33 ):133-164. Available from: https://sid.ir/paper/196968/en

IEEE: Copy

MORTEZA DELAVARI, Razieh Moradi, and AMIR ALI TABBAKH SHABANI, “MINERAL CHEMISTRY, THERMOBAROMETRY AND TECTONOMAGMATIC SETTING OF LATE-CRETACEOUS VOLCANIC ROCKS FROM THE KOJID AREA (SOUTH OF LAHIJAN, NORTHERN ALBORZ),” PETROLOGY, vol. 9, no. 33 , pp. 133–164, 2018, [Online]. Available: https://sid.ir/paper/196968/en

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