Petrogenesis of granitic rocks of the Jabal Sabir area, South Taiz City, Yemen Republic

El-Gharbawy, R. I.

doi:10.1007/s11631-011-0501-y

Cited by 3 publications

(2 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The silicic plutons are widespread but are more abundant in the south and along the western escarpment slopes of the plateau towards the Red Sea border. The plutons have alkaline or peralkaline affinity and are produced by fractional crystallization from basic magmas [34,37,38].…”

Section: Figure 2 Simplified Regional Map Showing Distribution Of Cementioning

confidence: 99%

“…Felsic plutons of varying dimensions are found intruding into the older volcanic rocks (Tb1, Tr1, Tb2 and Tr2) in Obviously these Tertiary granite plutons represent the coeval magmatic phase with the different intrusions, located in the western part of Yemen. Plutons vary in composition from alkali granite to syenogranite [15,38], however to simplify the terms for this study, all these variable compositions are referred to as "granites". The granite plutons occur as stocks, typically show sharp and discordant contacts with adjoining volcanic rocks, indicating intrusion into brittle and cooler crust (Fig.…”

Section: Felsic Plutonic Rocks (Tg)mentioning

confidence: 99%

See 1 more Smart Citation

Cenozoic Eruptive Stratigraphy and Structure in Taiz area of Yemen

Malek¹

2014

EARTH

View full text Add to dashboard Cite

The present study focuses on the field description of a bimodal volcanic rock centre and fault types present in Taiz area located in the southern part of Yemen. Taiz area serves as one of the key areas to understand the Afro-Arabian bimodal volcanism and the emplacement of Afar plume and the relationship between extension tectonics and magmatism. Taiz area comprises bimodal volcanic rocks encompassing mafic and silicic lava flows and pyroclastic rocks. The lava flows were erupted in five phases-three major basic and two acid phases. Lower basalt sequence (Tb1) is the oldest and main phase of flood basalt volcanism, formed as part of a wide spread volcanism within the Afro-Arabian region. This is followed by lower silicic sequence phase (Tr1) consisting of varied assortment of lithologies such as rhyolite flows with subordinate ignimbrites, welded ash, pyroclastic breccia, and random pumice and obsidian. The middle basalt sequence phase (Tb2) has been formed from the flows fed by fissure-dyke systems and separated from Tr1 by red colored weathering band of saprolitic bole (paleosol). The latest silicic sequence phase (Tr2) with limited exposures in the region, comprises rhyolitic plug domes, rhyolitic lava flows and locally welded and unwelded volcaniclastic deposits. In places, the silicic volcanic rocks have been diagenetically altered to bentonitic clay minerals and zeolites. The youngest phase of volcanic rocks represented by the basaltic rocks in the region (Tb3) is exposed in few outcrops along the southeastern slope of the mapped area and conformably capping the Tr2. It includes the basaltic flows intercalated with mafic conglomerate and tuff layers. The study area has been subjected to tensional tectonic regime throughout much of the Tertiary and extensions led to volcanism, granitic rock intrusions and formation of structural elements such as normal faults and deep joints. NW, NE, and E-W are the three major trends of faults recognized and these are related to the progressive rifting of Red Sea and Gulf of Aden.

show abstract

Section: Figure 2 Simplified Regional Map Showing Distribution Of Cementioning

confidence: 99%

Section: Felsic Plutonic Rocks (Tg)mentioning

confidence: 99%

Cenozoic Eruptive Stratigraphy and Structure in Taiz area of Yemen

Malek¹

2014

EARTH

View full text Add to dashboard Cite

show abstract

Geochemical and isotopic constraints on island arc, synorogenic, post-orogenic and anorogenic granitoids in the Arabian Shield, Saudi Arabia

Robinson

Foden

Collins

2015

Lithos

View full text Add to dashboard Cite

Geoengineering Characterization of the Rock Masses of Northern Face of Jabal Sabir, Taiz City, Yemen

Qadhi¹,

Janardhana²

2017

IJERA

View full text Add to dashboard Cite

This paper is aimed at the description and the geotechnical characterization of the Tertiary granitic rock masses of the northern face of Sabir Mountain, Taiz city, Yemen, for the first time. For accomplishing this task, direct and indirect approaches are adopted. The direct approach is represented by field and laboratory investigations. Field investigations include discontinuity (joints) measurements/evaluation, applied Rock Mass Rating (RMR) system and Geological Strength Index (GSI) system, in addition to field tests, while laboratory investigations encompass physico-mechanical tests carried out on granitic rock materials. Indirect approach for the estimation of shear strength parameters (c, Ø), compressive strength (σ cm ), tensile strength (σ tm ) and deformation modulus (E rm ) of these rock masses was made by applying the generalized Hoek-Brown failure criterion using geotechnical Roc-Lab software. The laboratory results indicate that the Tertiary granitic rock masses show wide range of variations in their physico-mechanical characteristics owing to degree of weathering /alteration and microfractures. The intact samples of Sabir granitic (Tg) rocks show "Moderate" to "High" density, "Low" to "Medium" porosity, "Good" to "Marginal" water absorption capacity and "Weak" to "Very Strong" strength. Stereographically, three main sets of discontinuities (joints) are identified at each station; however, the fourth joint set occurs, in addition to random joint sets. The discontinuities (joints) trend predominately in NE-SW and NW-SE directions in conformity with the regional structures or faults. According to Jv j/m³ values, the degree of jointing of these rock masses are varied from "Moderate" to "High" jointing. These rocks are categorized as "Fair" to "Excellent" quality, "Fair" to "Good/Very Good" quality and "Poor" to "Very Good" quality classes according to RQD, RMR b89 and GSI respectively. Values of the shear strength parameters (c and Ø) and the other rock mass parameters (σ tm , σ c , σ cm and E rm ) show variations depending on the rock mass quality and properties of intact rock. However, in general the values of the rock mass parameters are found to increase with increase in the quality of rock mass and intact rock properties.

show abstract

Petrogenesis of granitic rocks of the Jabal Sabir area, South Taiz City, Yemen Republic

Cited by 3 publications

References 35 publications

Cenozoic Eruptive Stratigraphy and Structure in Taiz area of Yemen

Cenozoic Eruptive Stratigraphy and Structure in Taiz area of Yemen

Geochemical and isotopic constraints on island arc, synorogenic, post-orogenic and anorogenic granitoids in the Arabian Shield, Saudi Arabia

Geoengineering Characterization of the Rock Masses of Northern Face of Jabal Sabir, Taiz City, Yemen

Contact Info

Product

Resources

About