TY - JOUR
T1 - Origin of Fe–Ti mineralization in the Late Jurassic to Early Cretaceous Kahnouj ophiolitic complex, Makran accretionary prism, SE Iran
AU - Ghasemi Siani, Majid
AU - Mehrabi, Behzad
AU - Ganerod, Morgan
AU - Holwell, David A.
AU - Yang, Huai Jen
AU - Karimi Shahraki, Behrouz
N1 - Funding Information:
We acknowledge financial support of the Iranian Mineral Processing Research Corporation (IMPRC) and Kharazmi University of Tehran. Prof. Andrew Locock (University of Alberta) is thanked for his helpful comments for improving the mineral chemistry section. The authors are very grateful to Prof. David Lentz (University of New Brunswick, Canada) for thorough reviews of earlier versions of the manuscript and for English editing. Editor Prof. Paul T. Robinson is thanked for his advice, devoted editorial handling and English editing. Suggestions by two anonymous reviewers helped us to clarify our descriptions and interpretations and improved the paper tremendously. Authors also would like to thank the Journal manager, Shruti Venkiteswaran.
Funding Information:
We acknowledge financial support of the Iranian Mineral Processing Research Corporation (IMPRC) and Kharazmi University of Tehran . Prof. Andrew Locock (University of Alberta) is thanked for his helpful comments for improving the mineral chemistry section. The authors are very grateful to Prof. David Lentz (University of New Brunswick, Canada) for thorough reviews of earlier versions of the manuscript and for English editing. Editor Prof. Paul T. Robinson is thanked for his advice, devoted editorial handling and English editing. Suggestions by two anonymous reviewers helped us to clarify our descriptions and interpretations and improved the paper tremendously. Authors also would like to thank the Journal manager, Shruti Venkiteswaran.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10
Y1 - 2022/10
N2 - The Kahnouj ophiolitic complex is part of the large Makran accretionary prism, SE Iran, and from the base to top consists of ultramafic-mafic rocks (Band-e-Zeyarat complex), diabase sheeted dikes, and volcanic rocks (Dar Anar complex). The Late Jurassic to Early Cretaceous (156 to 121 Ma) Kahnouj crustal section consists of layered gabbros with ultramafic sill-like bodies at the base that grade upward into variable isotropic gabbros. The Fe–Ti ore mineralization of the Dar Gaz district is hosted within the central part of the Kahnouj complex, consisting of coarse-grained gabbro (152.7 ± 5.1 Ma), fine-grained pyroxene-hornblende gabbro, hornblende gabbro (126.5 ± 1.6 Ma), diabase dikes (122.1 ± 2.4 Ma), and granitoid rocks associated with minor feldspathic wehrlite. Economic oxide mineralization (up to 25% FeO + TiO2) is mainly composed of: (1) Intergrown titanomagnetite (containing up to 19 wt% TiO2 and 0.26 to 1.74 wt% V2O3) and ilmenite with hercynite and chromian spinel exsolutions at their boundaries; (2) ilmenite lamella (containing up to 52 wt% TiO2 and 1 to 3 wt% V2O3) in titanomagnetite; and (3) discrete oxide minerals and minor sulfides displaying interstitial textures with formed by fractional crystallization and gravitational settling. Microtextures in the coarse-grained gabbro imply that water-rich fluids migrated along grain boundaries in a ductile regime, causing partial melting and growth of secondary hornblende, An-rich plagioclase, oxide mineral refertilization, and spinel group minerals developed at the boundaries between ilmenite and titanomagnetite.
AB - The Kahnouj ophiolitic complex is part of the large Makran accretionary prism, SE Iran, and from the base to top consists of ultramafic-mafic rocks (Band-e-Zeyarat complex), diabase sheeted dikes, and volcanic rocks (Dar Anar complex). The Late Jurassic to Early Cretaceous (156 to 121 Ma) Kahnouj crustal section consists of layered gabbros with ultramafic sill-like bodies at the base that grade upward into variable isotropic gabbros. The Fe–Ti ore mineralization of the Dar Gaz district is hosted within the central part of the Kahnouj complex, consisting of coarse-grained gabbro (152.7 ± 5.1 Ma), fine-grained pyroxene-hornblende gabbro, hornblende gabbro (126.5 ± 1.6 Ma), diabase dikes (122.1 ± 2.4 Ma), and granitoid rocks associated with minor feldspathic wehrlite. Economic oxide mineralization (up to 25% FeO + TiO2) is mainly composed of: (1) Intergrown titanomagnetite (containing up to 19 wt% TiO2 and 0.26 to 1.74 wt% V2O3) and ilmenite with hercynite and chromian spinel exsolutions at their boundaries; (2) ilmenite lamella (containing up to 52 wt% TiO2 and 1 to 3 wt% V2O3) in titanomagnetite; and (3) discrete oxide minerals and minor sulfides displaying interstitial textures with formed by fractional crystallization and gravitational settling. Microtextures in the coarse-grained gabbro imply that water-rich fluids migrated along grain boundaries in a ductile regime, causing partial melting and growth of secondary hornblende, An-rich plagioclase, oxide mineral refertilization, and spinel group minerals developed at the boundaries between ilmenite and titanomagnetite.
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U2 - 10.1016/j.lithos.2022.106784
DO - 10.1016/j.lithos.2022.106784
M3 - Article
AN - SCOPUS:85133435321
SN - 0024-4937
VL - 426-427
JO - Lithos
JF - Lithos
M1 - 106784
ER -