نتایج جستجو برای: ophiolite complex

تعداد نتایج: 784687  

2001
A. K. EL-SHAZLY A. CALVERT

Seven eclogite facies samples from lithologically different units which structurally underlie the Semail ophiolite were dated by the Ar/Ar and Rb–Sr methods. Despite extensive efforts, phengite dated by the Ar/Ar method yielded saddle, hump or irregularly shaped spectra with uninterpretable isochrons. The total gas ages for the phengite ranged from 136 to 85 Ma. Clinopyroxene–phengite, epidote–...

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2008
Cin-Ty Aeolus Lee Masaru Oka Peter Luffi Arnaud Agranier

[1] Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses of B and Li in serpentinized peridotites from the Feather River Ophiolite (California) indicates that B is enriched in serpentine minerals compared to the whole-rock and less altered olivine grains, while Li in serpentine is depleted or comparable to whole-rock Li. The high B contents of serpentine minerals cor...

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Journal: Geopersia 2018
Habibolah ghasemi, Khadije Jamshidi, Laicheng Miao, Mahmoud Sadeghian,

Numerous post-ophiolite intrusions exposed into the late Cretaceous–Paleocene Sabzevar ophiolite belt, northeast Iran. The intrusions consist of calc-alkaline intermediate to felsic rocks with metaluminous to peraluminous in nature and adakitic affinities. Based on U-Th-Pb dating on separated zircons by SHRIMP Ⅱ, the emplacement age of these rocks into the ophiolite zone is constrained to ~45 M...

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Journal: :Journal of Geography (Chigaku Zasshi) 1999

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Journal: :Earth and Planetary Science Letters 2018

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ژورنال: بلورشناسی و کانی شناسی ایران 2018
رحمانی, فاطمه, مکی‌زاده, محمدعلی, نقره‌ئیان, موسی,

In the eastern part of the Sabzevar ophiolite, southeast of Soleymanieh, there are white to pale greenish veins of diopsidite with 1–15 cm width inside mantle serpentinized harzburgites. The center of these veins is rather homogeneous and includes a monomineralic clinopyroxen with granular texture. The contact between the pure clinopyroxene and its host peridotite is always progressive and char...

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Journal: :زمین شناسی اقتصادی 0
رضا شمسی پور دهکردی مریم صادقی زهره غلامی فشارکی

nain ophiolite melange is located 140 km east of isfahan. based on the geological studies, this area belongs to mesozoic ophiolite of urumieh – dokhtar zone, west of central iran. country rocks are pridotite and serpentinized pridotite. the pridotite rocks are composed of harzburgite, lherzolite and replacement dunite which is belong to spinel pridotite facies.paragenesis of ore minerals are ch...

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ژورنال: بلورشناسی و کانی شناسی ایران 2013
آرایی, شوجی, نصوحیان, نرگس, ترابی, قدرت ,

The Bayazeh ophiolite, with Paleozoic age, is located in the eastern margin of the Yazd Block (Central Iran). This ophiolite consists of serpentinized peridotites, metagabbro, ultrabasic metamorphosed dikes, metapicrite, serpentinite and metalistvenite. Rock forming minerals of the metapicrites in the Bayazeh ophiolite are olivine (completely altered to serpentine), clinopyroxene (diopside, aug...

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Journal: :Geologica Carpathica 2014

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ژورنال: بلورشناسی و کانی شناسی ایران 2016
نصرآبادی, محسن, قلی‌زاده, کاظم ,

Metamorphic rocks that mostly consist of amphibolite, amphibole schist, garnet hornblendite and rarely metamorphosed chemical and terrigenous sediments are found in the ophiolitic complex of north Torbat-E- Heidarieh. Thermobarometry calculations of amphibolite samples indicate temperature higher than 800 °C and pressure less than 5 Kb. Metamorphic conditions of  amphibole schist and garnet hor...

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