Geology, Re-Os age, S and O isotopic composition of the Lar porphyry Cu-Mo deposit, southeast Iran

Boomeri, Mohammad; Moradi, Rahele; Stein, Holly J.; Bagheri, Sasan

doi:10.1016/j.oregeorev.2018.11.018

Cited by 6 publications

(1 citation statement)

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“…The main body of the Lar igneous complex includes grey to dark grey volcanic rocks such as lava and pyroclastic breccias which were intruded by non-mineralised and mineralised plutonic rocks such as stock and dykes (Figs 1C,. Re-Os dating of two molybdenite samples from two different drill holes has yielded ages of 29.72 ± 0.11 and 31.95 ± 0.11 Ma, suggesting that the mineralisation system was active for at least 2.2 myr (Boomeri et al, 2019) and showing that all above-mentioned igneous rocks are older than 32 Ma. Structurally, there are at least two fault and fracture systems in the Lar igneous complex (Fig.…”

Section: Introductionmentioning

confidence: 99%

Petrology and origin of the Lar igneous complex of the Sistan suture zone, Iran

2020

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The Oligocene Lar igneous complex is located in the Sistan suture zone of Iran, being emplaced in Paleocene to Eocene flysch-type rocks. This complex includes mainly intermediate K-rich volcanic (trachyte, latite and andesite) and plutonic (syenite and monzonite) rocks that belong to shoshonitic magma. The geochemical characteristics of the Lar igneous complex, such as an enrichment of LREE and LILE relative to HREE and HFSE, respectively, a negative anomaly of Ti, Ba and Nb and a positive anomaly of Rb and Th are similar to those of arc-type igneous rocks. Tectonic discrimination diagrams also show that rocks of the Lar igneous complex fall within the arc-related and post-collisional fields and K-enrichment of these rocks confirm the post-collisional setting. Based on geochemical features, the Lar igneous complex magma was derived from partial melting of a phlogopite-bearing, enriched and metasomatised lithospheric mantle source and the magma was affected by some evolutionary processes like fractional crystallisation and crustal contamination.

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Section: Introductionmentioning

confidence: 99%