Hf-Nd isotope constraints on the origin of Dehshir Ophiolite, Central Iran

Hadi Shafaii Moghadam; Robert J. Stern; Jun Ichi Kimura; Yuka Hirahara; Ryoko Senda; Takashi Miyazaki

doi:10.1111/j.1440-1738.2012.00815.x

Hf-Nd isotope constraints on the origin of Dehshir Ophiolite, Central Iran

Hadi Shafaii Moghadam^*, Robert J. Stern, Jun Ichi Kimura, Yuka Hirahara, Ryoko Senda, Takashi Miyazaki

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

The peri-Arabian ophiolite belt, from Cyprus in the west, eastward through Northwest Syria, Southeast Turkey, Northeast Iraq, Southwest Iran, and into Oman, marks a 3000km-long convergent margin that formed during a Late Cretaceous (ca 100Ma) episode of subduction initiation on the north side of Neotethys. The Zagros ophiolites of Iran are part of this belt and are divided into Outer (OB) and Inner (IB) Ophiolitic Belts. We here report the first Nd-Hf isotopic study of this ophiolite belt, focusing on the Dehshir ophiolite (a part of IB). Our results confirm the Indian mid-oceanic ridge basalt (MORB) mantle domain origin for the Dehshir mafic and felsic igneous rocks. All lavas have similar Hf isotopic compositions, but felsic dikes have significantly less-radiogenic Nd isotopic compositions compared to mafic lavas. Elevated Th/Nb and Th/Yb in felsic samples accompany nonradiogenic Nd, suggesting the involvement of sediments or continental crust.

Original language	English
Pages (from-to)	202-214
Number of pages	13
Journal	Island Arc
Volume	21
Issue number	3
DOIs	https://doi.org/10.1111/j.1440-1738.2012.00815.x
Publication status	Published - Sept 2012
Externally published	Yes

Keywords

Hf-Nd isotope
Late Cretaceous
Ophiolites
Subduction initiation
Zagros

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10.1111/j.1440-1738.2012.00815.x

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title = "Hf-Nd isotope constraints on the origin of Dehshir Ophiolite, Central Iran",

abstract = "The peri-Arabian ophiolite belt, from Cyprus in the west, eastward through Northwest Syria, Southeast Turkey, Northeast Iraq, Southwest Iran, and into Oman, marks a 3000km-long convergent margin that formed during a Late Cretaceous (ca 100Ma) episode of subduction initiation on the north side of Neotethys. The Zagros ophiolites of Iran are part of this belt and are divided into Outer (OB) and Inner (IB) Ophiolitic Belts. We here report the first Nd-Hf isotopic study of this ophiolite belt, focusing on the Dehshir ophiolite (a part of IB). Our results confirm the Indian mid-oceanic ridge basalt (MORB) mantle domain origin for the Dehshir mafic and felsic igneous rocks. All lavas have similar Hf isotopic compositions, but felsic dikes have significantly less-radiogenic Nd isotopic compositions compared to mafic lavas. Elevated Th/Nb and Th/Yb in felsic samples accompany nonradiogenic Nd, suggesting the involvement of sediments or continental crust.",

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author = "Moghadam, \{Hadi Shafaii\} and Stern, \{Robert J.\} and Kimura, \{Jun Ichi\} and Yuka Hirahara and Ryoko Senda and Takashi Miyazaki",

year = "2012",

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AU - Moghadam, Hadi Shafaii

AU - Stern, Robert J.

AU - Kimura, Jun Ichi

AU - Hirahara, Yuka

AU - Senda, Ryoko

AU - Miyazaki, Takashi

PY - 2012/9

Y1 - 2012/9

N2 - The peri-Arabian ophiolite belt, from Cyprus in the west, eastward through Northwest Syria, Southeast Turkey, Northeast Iraq, Southwest Iran, and into Oman, marks a 3000km-long convergent margin that formed during a Late Cretaceous (ca 100Ma) episode of subduction initiation on the north side of Neotethys. The Zagros ophiolites of Iran are part of this belt and are divided into Outer (OB) and Inner (IB) Ophiolitic Belts. We here report the first Nd-Hf isotopic study of this ophiolite belt, focusing on the Dehshir ophiolite (a part of IB). Our results confirm the Indian mid-oceanic ridge basalt (MORB) mantle domain origin for the Dehshir mafic and felsic igneous rocks. All lavas have similar Hf isotopic compositions, but felsic dikes have significantly less-radiogenic Nd isotopic compositions compared to mafic lavas. Elevated Th/Nb and Th/Yb in felsic samples accompany nonradiogenic Nd, suggesting the involvement of sediments or continental crust.

AB - The peri-Arabian ophiolite belt, from Cyprus in the west, eastward through Northwest Syria, Southeast Turkey, Northeast Iraq, Southwest Iran, and into Oman, marks a 3000km-long convergent margin that formed during a Late Cretaceous (ca 100Ma) episode of subduction initiation on the north side of Neotethys. The Zagros ophiolites of Iran are part of this belt and are divided into Outer (OB) and Inner (IB) Ophiolitic Belts. We here report the first Nd-Hf isotopic study of this ophiolite belt, focusing on the Dehshir ophiolite (a part of IB). Our results confirm the Indian mid-oceanic ridge basalt (MORB) mantle domain origin for the Dehshir mafic and felsic igneous rocks. All lavas have similar Hf isotopic compositions, but felsic dikes have significantly less-radiogenic Nd isotopic compositions compared to mafic lavas. Elevated Th/Nb and Th/Yb in felsic samples accompany nonradiogenic Nd, suggesting the involvement of sediments or continental crust.

KW - Hf-Nd isotope

KW - Late Cretaceous

KW - Ophiolites

KW - Subduction initiation

KW - Zagros

UR - https://www.scopus.com/pages/publications/84865543222

U2 - 10.1111/j.1440-1738.2012.00815.x

DO - 10.1111/j.1440-1738.2012.00815.x

M3 - Article

AN - SCOPUS:84865543222

SN - 1038-4871

VL - 21

SP - 202

EP - 214

JO - Island Arc

JF - Island Arc

IS - 3

ER -

Hf-Nd isotope constraints on the origin of Dehshir Ophiolite, Central Iran

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Keywords

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