نتایج جستجو برای: lineation

تعداد نتایج: 125  

Journal: :Frontiers in Earth Science 2023

Climate change and human activity can both exert a role in the river discharge sediment load deltas when sea level remains relatively stable. The Pearl River Delta constitutes metropolitan region of Guangdong–Hong Kong–Macau Greater Bay Area, its evolution past future impacts sustainable development this region. In manuscript, core situated northern South China Sea, adjacent to Qiao Island Zhuh...

Journal: :Journal of Structural Geology 2022

The Ramsay-Graham heterogeneous simple shear zone model revolutionized our understanding of finite strain variation in orogenic belts. Many deeply exhumed (>20 km depths) zones continental crust are a consequence sub-simple accumulation during contraction and displacement at high temperature. Here we explore the micro-scale record this process using syn-kinematic monazite two >20,000 km2 terran...

Journal: :Boletín Geológico 2022

The origin of the Aburrá Valley (AV) is proposed as a set coalescent tectonic subbasins located along northern portion Central Cordillera Colombia, Northern Andes Colombia. Itagüí, Medellín, Bello, and Barbosa have developed between Romeral Shear Zone (RSZ) Antioqueño Batholith starting in Late Cenozoic. aim this study to contribute understanding AV neotectonic framework using anisotropy magnet...

داودیان دهکردی, علیرضا,

The study area is located within the shear zone of north Shahrekord. There are many small and medium granitoid plutons that have intruded in the metamorphic rocks with Middle Jurassic in age. These rocks show sharp mylonitic foliation and lineation as the results of undergoing strong deformation.  Most of these granitoid plutons contain the assemblage of quartz + K-feldspar + plagioclase + biot...

ترابی, قدرت,

Amphibolites are one of the metamorphic rock units of Jandaq ophiolite and exposed in a considerable volume. These rocks are metamorphism products of basalts, pillow lavas and diabasic dikes of Jandaq ophiolite. Amphibolites contain amphibole, plagioclase, garnet, alkali feldspar (orthoclase), magnetite, biotite, muscovite, sphene, quartz, epidote and calcite minerals. These rocks contain very ...

آلیانی, فرهاد, سید علیزاده گنجی, سید محمد , فرهپور, محمد مهدی ,

The study area is located in northern part of metamorphic belt of Sanandaj-Sirjan in east of Hamedan Batolith. This area is mainly composed of regional metamorphic rocks, such as staurolith, andalusite, silimanite and garnet bearing mica schists and slates, with nearly NW-SE trend. The age of these rocks (tectonites) are Pre-jurassic and have experienced two stages of deformation during du...

M. Jamshidibadr N. S. Faramarzi

Robat-e Zengejeh rocks affected by a variety of events began from Precambrian. This research studied preserved effects of the events. Regional metamorphism is the oldest event in this rocks include schist, amphibolite and orthogneiss, that reached up to amphibolite facies. After this regional metamorphism, it seems that mesocratic (624±5Ma) and hololeucocratic granitoides intruded respectively....

Journal: :Journal of Glaciology 2021

Abstract Crary Ice Rise formed after the Ross Shelf re-grounded ~1 kyr BP. We present new ice-penetrating radar data from two systems operating at center frequencies of 7 and 750 MHz that confirm ice rise is composed a former shelf buried by subsequent accumulation. Stacks englacial diffraction hyperbolas are almost everywhere across central extend up to ~350 m above bed. In many cases, bed ref...

Journal: :Journal Of Geophysical Research: Solid Earth 2021

Crustal architecture at slow-spreading oceanic ridges results from complex interactions between magmatism, hydrothermalism, and tectonics. IODP Hole U1473A was drilled during Expeditions 360 362T the summit of Atlantis Bank, a gabbroic massif exhumed Southwest Indian Ridge. In this study, we identify quantify plastic deformation processes in lithologies active slip systems plagioclase 115 micro...

رحیمی, بهنام, علی زاده, حسین ,

The Mashhad ophiolitic and metamorphic complex was intruded by Mashhad granitoids during different episodes of magmatisms. Dehnow pluton with diorite-granodiorite composition was intruded at earliest stage of magmatism during Late Triassic (Norian, 215± 4My). This pluton is cut by the NW-SE trending ductile shear zones which are dominated by an intense ductile deformation. The rocks of Dehnow p...

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