Shanderman ECLOGITEs are exposed at the west of Shanderman town, Talesh Mountains in the north of Iran. Protoliths of these rocks had basaltic composition. Geochemical studies indicate that most of the samples have tholeiitic feature. Mg# versus Cr and Ni show that they experienced olivine and clinopyroxene fractionation. Spider diagram shows more fractionation of olivine compared to clinopyroxene. The trace element versus major oxides diagrams show that major oxides had no significant (except Na and to some extent Fe) variation during alteration and subsequent metamorphism. Based on ∑REE, ECLOGITE of the Shanderman can be divided into two groups. First group shows ∑REE= 31.1 ppm and (La/Lu)N=0.6. Second group have ∑REE= 139.2 ppm and (La/Lu)N=2.3. Chondrite REE normalized patterns show that they are comparable with N-MORB and E-MORB.  These patterns (N-E MORB) indicate that either Shanderman ECLOGITE protolith magma source was not homogenous or it experienced different melting degrees, changing from LSS (Slow spreading ridge) to FSS (fast spreading ridge).

In the eastern part of an ophiolitic complex in Sulabest area (in south east of Birjand) has exposed a metamorphic series including ECLOGITE, blueschist, garnet bearing blueschist, amphibolite, epidote amphibolite, greenschist and micaschist. In addition to basaltic pillow lavas and cherts which have changed to ECLOGITE and blueschist, were also metamorphosed most of gabbroic cumulate series to overlaying sheeted diabasic dykes. This metamorphism is within the limit of prehnite-actinolite(sub greenschist) to greenschist facieses. Presence of orbitoides microfossil within micritic limestones in ophiolitic complex, indicates Maastrichtian age of emplacement for ophiolitic complex. Thermobarometry results of ECLOGITEs showing that peak temperature of ECLOGITEs from Sulabest varies from 496 to 592°C and their peak pressures ranging from 22.0 to 26.4 Kbars. Epidote amphibolite retrograde metamorphism of these ECLOGITEs has been done in a temperature of 549 to 592°C and a pressure of 6.7 to 7.4 Kbars. Textural evidences and analyses results showing that, the second stage of metmorphism were taken place during ascending root of these rocks on to the surface. Coexisting of ECLOGITEs in studied area with blueschists, amphibolites and garnet amphibolites in the eastern part of an ophiolitic complex and combination of field observations and laboratory works, indicates that a subduction activity with a late Cretaceous age were responsible for the studied area and consequently for east of Iran, which were followed by an thrusting process during colliding of Afghan(Helmand) and Lut-Block plates.

The Sanandaj-Sirjan zone is a NW-SE trending orogenic belt immediately north of the Zagros suture, which represents the former position of the Neotethys Ocean. This zone includes a Pan-African basement similar to the various terranes to the north in Central Iran. The crystalline basement is nonconformably overlain by the Paleozoic-Triassic platform sediments, which in turn are unconformably covered by sedimentary and volcanic strata of the Jurassic arc. The Cretaceous carbonates overlie the older rocks with a regional angular unconformity. The Chadegan high-P metamorphic complex exposed along the upper Zayanderoud and consists of quartz schists, amphibolites, gneisses, marbles and ECLOGITEs, and is nonconformably underlain by the fossiliferous Permian carbonates, suggesting a Pre-Permian age. In this paper we present new data including whole rock major and trace element compositions, mineral chemistry and radiogenic isotope data for the selected metabasites. The high field strength element (HFSE) abundances and Sr-Nd-Hf ratios suggest tholeiitic compositions with distinct within plate affinity rather than MORB. We also present new 206Pb/238U zircon age of 568. 0 ± 5. 3 Ma for a crosscutting orthogneiss reconfirming the Late Neoproterozoic age for the granitic protolith. We conclude that previously presented Ar-Ar ages for white-micas in ECLOGITEs and gneisses are indicative of metamorphic crystallization due to the regional plutonic arc activity. A comparison is made with the well-investigated Menderes Massif in Turkey where an orthogneiss-metabsite association with similar age and chemistry makes extensive exposures. We also conclude that this rock complex is extended from Zayanderoud to Khoy and beyond to the Menderes Massif and discuss the connection with the final amalgamation tectonics of the Gondwana near the beginning of the Cambrian Period.

The Shafarud Metamorphic Complex is located in the northwestern part of Iran in the Alborz-Talesh Mountain range. Paleozoic metamorphism (Carboniferous-Permian) are the oldest rocks of this region. The ECLOGITEs of the Shafarud Metamorphic Complex are exposed as lenses of several meters in size along with serpentinite masses in the basal parts. The mineral assemblage of the ECLOGITEs includes garnet, pyroxene, amphibole, white mica, epidote, plagioclase, chlorite, quartz and sphene. SEM images and the results of electron probe micro-analyzer (EPMA) show the growth chemical zoning in garnet porphyroblasts. According to the calculation of the temperature-pressure pattern, using Jacobian transformation, the core and the rim of garnets have been formed respectively at temperature-pressure 600 ºC-18. 2 Kbar (ECLOGITE facies, ~60 Km) and 550 ºC-7. 5 Kbar (green schist facies, ~25 Km). According to the results of this study, the structural pattern of the ECLOGITEs of the Shafarud Metamorphic Complex is similar to the alpine type, during which the process of uplift and pressure reduction occurred in almost isothermal conditions due to a rapid uplift.

All samples of Shanderman ECLOGITEs contain amphibole, epidote group minerals and chlorite as retrograde phases. Amphiboles show zoning with high FeO and Al2O3 content at the rims and high MgO in the cores in some samples. In these samples, the amphibole compositions vary from tremolitic hornblende to tschermakite and edenitic hornblende from core to rim, respectively. Amphibole inclusions in zoisite have similar composition to matrix amphiboles and show tremolitic hornblende nature. Epidotes include both zoisite and clinozoisite existing in all samples. They show zoning and have high Al2O3 content in the core and high FeO content at the rims. Pistasite content in the core is 0.09% and at the rim is 0.17%. Plagioclase is enriched in Na and is almost pure albite endmember. Chlorites are MgO rich and are of Repidolite and Brunsvigite types. They show FeMg-1 and tschermakitic substitutions. Fe/Mg distribution coefficient among amphibole and chlorite for the cores of the minerals is around 0.5 and for the rims is 1. Thermobarometry of zoned amphiboles show that these minerals are grown from core to rim due to an increase in temperature and pressure. 

The metabasite rocks from north of Shahrekord, which is a part of structural zone of Sanandaj-Sirjan, are undergone medium temperature - high pressure metamorphism (ECLOGITE facies). These rocks then were subjected to a retrograde metamorphism (amphibolite facies). A distinct compositional zoning is preserved in fresh garnets which are formed during ECLOGITE facies. The compositional or growth zoning in these ECLOGITE rocks shows clockwise P-T-t path. In the beginning of metamorphism, P and T increased up to reach to the peak of high pressure metamorphism, then P decreased while the T was increasing during uplift and decompression. These growth stages indicate that Pmax was not contemporaneous with Tmax during ECLOGITE facies metamorphism of the metabasites from North of Shahrekord, in Sanandaj - Sirjan Zone.

The study area is situated in the west of Soltan Abad prom NE Sabzevar (Razavi Khorasan province). There is an exposure of metamorphic complex that contains green schist, blue schist, and amphibolite and ECLOGITE (?) facieses rocks. Gneissic body is located in the middle part of this complex (Koh-e-Chili). Protolithic and foliation intensity are variable in this body.Field evidences, whole rock geochemistry, geochronological data and nearly the same metamorphic pressure conditions of gneisses and blue schist’s (Gneiss: P=10.9 Kb and Blue schist: P=11-14 Kb) indicate that protolith of the gneisses have been differentiated series of oceanic crust and have experienced seduction zone metamorphism along with mafic series of Sabzevar oceanic basin (blue schists) as a consequence of north-ward movement of central Iranian micro continent in the Upper Eocene.

Felsic volcanic rocks embrace a portion of the volcanic succession in Kajan area of Urumieh-Dokhtar magmatic assemblage. Based on trace elemental abundances and patterns, the felsic rocks might be attributed to two distinct series. In one series, normalized trace and REE patterns are rather flat (La/Yb<17) but display negative Ti, P, Sr and Eu anomalies. This series, which is called normal calc alkaline series, is comparable to the felsic melts evolved by differentiation of mantle-derived basic partial melts in subduction zones. In the second series, which is here called adakitic series, trace and REE patterns are steep (La/Yb>28) and positive Sr anomaly. Origin of the magmas that generated the latter series is likely to be the Neotethyan slab partial melts under high pressure (amphibole ECLOGITE mineralogy).

The Pliocene calc-alkaline volcanic rocks are exposed in two areas in southeast and northwest of Isfahan and consist of andesites and dacites. Based on geochemical data and multielements pattern, these rocks are medium to high calc-alkaline suite and they show LILE and LREE enriched normalized multi-element patterns, and negative Nb and Ti. Condritenormalized REE patterns display a steep decrease from LREE to HREE without any Eu anomaly. They have higher SiO2 and Sr content and Sr/Y and La/Yb ratios and low MgO, Mg#, Y and Yb contents than the normal calc-alkaline volcanic rocks. These volcanic rocks show adakite characteristics. These features are consistent with ratios obtained from orogenic related volcanic rocks. These rocks may have been produced by partial melting of thickened lower continental crust or slab probably transformed to ECLOGITE or garnet -amphibolite. HREE and Y depleted pattern suggest the existence of garnet and amphibole as a residue in the source.

The study area is located 41 Km Southwest of Birjand, in the northern part of Sistan suture zone. An Eocene dioritic sub volcanic body together with and esites and basaltic and esites have intruded into the paleogene shales and sandstones. The main textures in these rocks are porphyric with micro granular groundmass, porphyric and glomeroporphyritic. Plagioclase (oligoclase-andesine) and amphibole (green hornblende) are the main phenocrysts. Biotite, clinopyroxene and rare olivine are the remaining minerals of these rocks. The negative anomaly in high field strength elements (HFSE) such as Nb and Ti in these rocks point to the geochemical characteristic of magmatic arcs. High ratio of LREE/HREE, Sr/Y (Ave.44.33), La/Yb (Ave.12.48), the amount of SiO2 and the absence of Eu negative anomaly show that these rocks are similar to adakites. On the base of obtained data, the magmatism can be the result of a post collision process in a subduction regime originated from an ECLOGITE source.