نتایج جستجو برای: tectonite

تعداد نتایج: 12  

1998
CARLOS J. GARRIDO JEAN-LOUIS BODINIER

melt fractions that percolated pervasively throughout the massif and On the basis of their structural and compositional characteristics, had a refractory, calc-alkaline character. Locally, these melts were mafic rocks in the Ronda peridotite are classified into four groups: tapped into cracks forming intrusive dykes. group A (garnet-bearing rocks) occurring in the spinel tectonite domain; group...

Journal: :Geosciences 2022

Magnetotelluric models spanning the Pacific–Australian Plate boundary in New Zealand’s South Island indicate a localized zone of low electrical resistivity that is spatially coincident with ductile mid-crustal part Alpine Fault Zone (AFZ). We explored source this anomaly by measuring properties samples collected from surface outcrops approaching AFZ have accommodated gradient systematic strain ...

حسین‌زاده, قادر, مؤید, محسن, مجرد, منیر ,

Hasht-Sar Kaleybar mafic, ultramafic and syenitic dykes are surrounded by Majid Abad Formation, Palaeocene age, volcanic deposits. The suite is restricted within the Horand, Mahmud Abad and Mokhtekan thrust and reverse faults. Clinopyroxenites, the oldest unit of the suite, have tholeiitic volcanic arc character and have some similarities with tectonite layer of oceanic crust, like Group A pyro...

Journal: :Geosystems and geoenvironment 2023

The Kızıldağ (Hatay) ophiolite in southern Turkey represents a complete, although fault-dissected, remnant of oceanic lithosphere that formed within the South Tethyan ocean during late Cretaceous. forms part Upper Cretaceous belt which includes Troodos (Cyprus), Baer-Bassit (Syria), Amanos (S Tukey), S Iran and Semail (Oman) ophiolites. Ion-probe (SIMS) dating seven samples crustal rocks (cumul...

2004
Peter B. Kelemen Mark S. Ghiorso

The Big Jim complex is a concentrically zoned ultramafic to felsic plutonic complex which intruded the pelitic Chiwaukum schist. Most of the major plutonic rock types (from websterite through hornblendite, gabbronorite, hornblende gabbro and diorite, to granodiorite) enclose harzburgite and metaperidotite xenoliths similar to foliated metaperidotite lenses included in the Chiwaukum schist. The ...

Journal: :Lithosphere 2022

Abstract The southern Patagonian Andes record Late Cretaceous–Paleogene compressional inversion of the Rocas Verdes backarc basin (RVB) and development fold-thrust belt (FTB). A ductile décollement formed in middle crust accommodated underthrusting, thickening, tectonic burial continental margin (Cordillera Darwin Metamorphic Complex (CDMC)) beneath RVB. We present new geologic mapping, quartz ...

Journal: :Geological Society of America Bulletin 2023

Located in the southern margin of Central Asian orogenic belt, stratigraphy and tectonic setting mafic 290−280 Ma Liuyuan Complex have been controversial for decades, with workers arguing a forearc ophiolite or continental rift setting. Here, we present results detailed field study, where was subdivided into troctolite, melatroctolite, layered gabbro, varitextured olivine hornblende plagiograni...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم زمین 1386

چکیده ندارد.

1999
G. GARUTI F. BEA F. ZACCARINI P. MONTERO

Pipe-like ultramafic bodies, hosting Ni–Cu–PGE sulphide deposits, INTRODUCTION intrude the Main Gabbro and the roof metasediments of the Ivrea The Ivrea Zone, in NW Italy, is believed to represent an Zone, NW Italy. These bodies were emplaced at 287 ± 3 Ma exposed section of the lower continental crust (Mehnert, and represent the last mantle-derived melts associated with an 1975; Garuti et al.,...

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