The Oligocene Avaj volcanic – plutonic complex of Central Iran: A record of magma evolution and mineral equilibria

Babazadeh, Shahrouz; Ghalamghash, Jalil; Furman, Tanya; D’Antonio, Massimo; Raeisi, Davood

doi:10.1016/j.jseaes.2021.104962

Cited by 10 publications

(6 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Transferring melts from a steady‐state (e.g., closed system in deeper levels) into an unsteady‐state (e.g., an open system in shallower levels) magmatic chambers is usually accompanied by assimilation and/or mixing processes (AFC) that give rise to the modification of primary magma compositions (Babazadeh, Furman, et al, 2019; Babazadeh, Ghalamghash, Furman, et al, 2021; Kuritani et al, 2005). Therefore, it is vital to appraise the effect of open system processes before using the elements to decipher the potential mantle sources.…”

Section: Discussionmentioning

confidence: 99%

“…Incompatible trace element ratios shed light on the origin of metasomatic components of subduction‐related magmas (Babazadeh, Furman, et al, 2019; Babazadeh, Ghalamghash, Furman, et al, 2021; Hawkesworth et al, 1997). Accordingly, subducted sediment components give rise to the enrichment of Th concentration, (Th–Ce–La)/Yb ratios and deviation of data towards higher 87 Sr/ 86 Sr ratios (Hauff et al, 2003; Staudigel et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Zircon U–Pb–Hf and whole‐rock Sr–Nd isotopic insights on the Silurian syenite–monzonite shoshonitic magmatism of Central Iran

Nayebi,

Raeisi,

Babazadeh

et al. 2023

Geological Journal

Self Cite

View full text Add to dashboard Cite

The Palaeozoic magmatic history of Central Iran is related to the subduction of the Proto‐Tethys Ocean and the amalgamation of Gondwana continental fragments. This study presents whole‐rock geochemistry, Sr–Nd isotope and zircon U–Pb–Hf ages of shoshonitic plutonic rocks (e.g., monzonite–syenite) from the north Posht‐e‐Badam (NPB) district with a view to constrain their petrogenetic and tectono‐magmatic evolution during the Palaeozoic. The geochemical data show moderate enrichment in large‐ion lithophile elements and Ti, large positive Pb anomalies, and depletion or moderate enrichment in high‐field‐strength elements (e.g., Nb and Ta), typical of continental arcs. Zircon LA–ICP–MS U–Pb ages are in the range of 444–428 Ma. The Sr–Nd–Hf isotope data, for example, (87Sr/86Sr)i = 0.7073 to 0.7089, εNd(t) = −1.4 to −0.2, and εHf(t) = −3.6 to +7.7, indicate derivation of the magma from a mantle source. The numerical modelling shows a contribution of less than 10% crustal assimilation and ~3% sediment into the melt‐derived mantle. We propose that metasomatic enrichment occurred during the subduction of Proto‐Tethyan Ocean between the Iranian microcontinents, leading to the formation of a shoshonitic melt. We infer that the recorded ages coincide with a continental rift episode followed by a rear arc tectonic region that spread along the northern active margin of Gondwana. Further, the change in magma affinity from calc‐alkaline (~474–512 Ma) to shoshonitic (444–428 Ma) in Central Iran is probably related to the gradual steepening of the slab dip angle and trench‐ward migration of the front arc into the region above metasomatically enriched rear arc mantle.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Zircon U–Pb–Hf and whole‐rock Sr–Nd isotopic insights on the Silurian syenite–monzonite shoshonitic magmatism of Central Iran

Nayebi,

Raeisi,

Babazadeh

et al. 2023

Geological Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because radiogenic isotope compositions and ratios of trace elements (having similar partition coefficients) are insensitive to the effects of closed‐system fractional crystallization, such data serve as tracers of the mantle source (Mazzeo et al, 2014; Morata et al, 2005). In important respects, the Tafresh plutonic rocks resemble volcanic and plutonic suites from the Eshtehard, Saveh, Avaj, and Kahrizak districts (Babazadeh, D'Antonio, Cottle, et al, 2021; Babazadeh, Ghalamghash, Furman, D'Antonio, & Raeisi, 2021; Nouri et al, 2018; Yazdani, Castillo, & Hassanzadeh, 2019). Universally, trace elements exhibit continental margin arc‐like signatures: high LILE/HFSE, high LILE/REE, and negative Nb, Ta, and Ti anomalies.…”

Section: Discussionmentioning

confidence: 99%

“…Kahrizak districts(Babazadeh, D'Antonio, Cottle, et al, 2021;Babazadeh, Ghalamghash, Furman, D'Antonio, & Raeisi, 2021;Nouri et al, 2018;Yazdani, Castillo, & Hassanzadeh, 2019). Universally, trace elements exhibit continental margin arc-like signatures: high LILE/HFSE, high LILE/REE, and negative Nb, Ta, and Ti anomalies.Tafresh data include high Th/Ta (8.5-23, avg.…”

mentioning

confidence: 99%

Petrogenesis of Miocene igneous rocks in the Tafresh area (central Urumieh‐Dokhtar magmatic arc, Iran): Insights into mantle sources and geodynamic processes

Babazadeh

Raeisi

D’Antonio³

et al. 2022

Geological Journal

Self Cite

View full text Add to dashboard Cite

Cenozoic tectono‐magmatism in Iran is widely considered to be related to subduction of the Neo‐Tethys Ocean. We employed whole‐rock and mineral geochemistry and isotopic data of intrusive rocks from Tafresh, central Urumieh‐Dokhtar magmatic arc, to evaluate the role of the mantle in magmatism, to assess the timing of emplacement, and to interpret the tectonic setting. Rock compositions range from gabbro or gabbro‐diorite (plagioclase + pyroxene ± olivine), to diorite (plagioclase + amphibole ± pyroxene), to granodiorite (quartz + plagioclase + K‐feldspar + amphibole + biotite), exhibiting high‐alumina calc‐alkaline affinity. Major oxide and trace element variations vary systematically from less to more evolved rocks suggesting a major role for fractional crystallization processes. Zircon LA‐ICP‐MS U–Pb ages of major rock types are in the range of 24–19 Ma, whereas those of gabbroic dikes are ~17.5 Ma. ԐNd values range between −1.8 and 3.7, and (87Sr/86Sr)i is narrowly restricted to 0.705–0.706, suggesting a common mantle source. The enrichment in light rare earth element (REE) enrichment and flat heavy REE patterns couple depletion of Nb–Ta–Ti indicate that subducting oceanic crust had interacted with the overlying mantle wedge. High‐alumina, mid‐Mg# Tafresh plutonic rocks formed from hydrous melts from which Ca‐pyroxene and magnetite crystallized earlier than plagioclase, whereas late‐crystallizing zircon nucleated while magma traversed through lithospheric mantle and Cadomian crust. Modelling of isotope and incompatible‐element patterns suggests the contribution of no more than ~5% molten sediment or other crustal components in Tafresh magma, at a developmental stage before most plagioclase and amphibole had crystallized. The Miocene Tafresh plutons originated during the final stages of subduction, before the collision between the Arabian and Eurasian plates.

show abstract

“…, mostly being I-type with a calcalkaline nature and meta-aluminous character (Rezaei-Kahkhaei et al, 2011;Kananian et al, 2014). Some of the intrusions, mainly those I-type granitoids with calcalkaline nature from the northern and central parts of the UDMA, contain enclaves (e.g., Ardestan: Babazadeh et al, 2017Babazadeh et al, , 2019aNiyasar: Honarmand et al, 2014;Haji Abad, Deh-Bala: Kazemi et al, 2019, 2022. These enclaves are comparable with those in arc-related plutons (Didier and Barbarin, 1991).…”

mentioning

confidence: 99%

Mineral Chemistry, Trace Elements, Isotopic Analysis and Zircon U‐Pb Dating in the Hesar Pluton, Northern UDMA, Iran: Implications for Pre‐Collisional Magma Mixing

KAZEMI,

MODABBERI,

GHARIBNEJAD

et al. 2024

Acta Geologica Sinica (Eng)

View full text Add to dashboard Cite

Hesar pluton in northern Urumieh‐Dokhtar‐Magmatic‐Arc hosts numerous Mafic‐Micro‐granular Enclaves (MMEs). Whole rock geochemistry, mineral chemistry, zircon U‐Pb and Sr‐Nd isotope were measured. It is suggested that the rocks are metaluminous (A/CNK=1.32‐1.45), subduction‐related I‐type calc‐alkaline gabbro to diorite with similar mineral assemblages and geochemical signatures. The host rocks yielded U‐Pb crystallization age of 37.3±0.4Ma for gabbro‐diorite. MMEs have relatively low SiO2 contents (52.9‐56.6wt.%) and high Mg# (49.8‐58.7), probably reflecting a mantle‐derived origin. Chondrite‐ and mantle‐normalized trace element patterns are characterized by LREEs and LILEs enrichment, HREEs and HFSEs depletion with slight negative Eu anomalies (Eu/Eu* = 0.86‐1.03). The host rocks yield (87Sr/86Sr)i ratios of 0.70492‐0.70510, positive ɛNd(t) values of +1.55‐+2.06, and TDM2 of 707‐736 Ma, which is consistent with associated mafic microgranular enclave (87Sr/86Sr)i=0.705014, ɛNd(t)=+1.75, TDM2=729Ma). All data suggest a magma‐mixing for enclaves and host rocks formation, showing a complete equilibration between mixed‐mafic and felsic magmas, followed by rapid diffusion. The TDM1(Nd) and TDM2(Nd) modal ages and U‐Pb dating indicate that host pluton was produced by partial melting of the lower continental crust and subsequent mixing with injected lithospheric mantle‐derived magmas in a pre‐collisional setting of Arabian‐Eurasian plates. Clinopyroxene composition indicates a crystallization temperature of ∼1000°C and a depth of ∼9km.

show abstract

The Oligocene Avaj volcanic – plutonic complex of Central Iran: A record of magma evolution and mineral equilibria

Cited by 10 publications

References 79 publications

Zircon U–Pb–Hf and whole‐rock Sr–Nd isotopic insights on the Silurian syenite–monzonite shoshonitic magmatism of Central Iran

Zircon U–Pb–Hf and whole‐rock Sr–Nd isotopic insights on the Silurian syenite–monzonite shoshonitic magmatism of Central Iran

Petrogenesis of Miocene igneous rocks in the Tafresh area (central Urumieh‐Dokhtar magmatic arc, Iran): Insights into mantle sources and geodynamic processes

Mineral Chemistry, Trace Elements, Isotopic Analysis and Zircon U‐Pb Dating in the Hesar Pluton, Northern UDMA, Iran: Implications for Pre‐Collisional Magma Mixing

Contact Info

Product

Resources

About