Results 91 to 100 of about 128,769 (349)

Routine characterization and interpretation of complex alkali feldspar intergrowths [PDF]

open access: yes, 2015
Almost all alkali feldspar crystals contain a rich inventory of exsolution, twin, and domain microtextures that form subsequent to crystal growth and provide a record of the thermal history of the crystal and often of its involvement in replacement ...
Fitz Gerald, John D.   +2 more
core   +1 more source

Volcanostratigraphic Sequences of Kebo-Butak Formation at Bayat Geological Field Complex, Central Java Province and Yogyakarta Special Province, Indonesia

open access: yesIndonesian Journal on Geoscience, 2016
DOI:10.17014/ijog.3.2.77-94Bayat Complex is usually used as a work field for students of geology and other geosciences. The study area is located in the southern part of the Bayat Complex.
Sri Mulyaningsih
doaj   +1 more source

Determination of Thermal Damage and Failure Time Analysis in Rocks Using Stochastic Models

open access: yesQuality and Reliability Engineering International, EarlyView.
ABSTRACT This study presents a stochastic modeling framework for estimating thermal damage and predicting failure time in fine‐grained Dholpur sandstone subjected to high‐temperature conditions. Unlike conventional approaches that rely on extensive thermally altered physical and mechanical properties, the proposed method utilizes only temperature and ...
Ankush Sharma
wiley   +1 more source

Mineral chemistry of garnet in pegmatite and metamorphic rocks in the Hamedan area

open access: yesJournal of Economic Geology, 2015
Introduction The area of this study is located near Hamadan within the Sanandaj - Sirjan tectonic zone. In the Hamadan area, consisting mainly of Mesozoic plutonic and metamorphic rocks, aplites and pegmatites locally contain garnets.(Baharifar et
Ahmad Ahmadi Khalaji, Zahra Tahmasbi
doaj  

Petrography and mineral chemistry of metamorphosed mantle peridotites of Nain Ophiolite (Central Iran)

open access: yesJournal of Economic Geology, 2017
Introduction Study of the petrology of the ophiolites as the relics of ancient oceanic lithosphere, is a powerful tool to reconstruct Earth’s history. Mantle peridotites have mostly undergone alteration and serpentinization to some extent.
Nargess Shirdashtzadeh   +2 more
doaj   +1 more source

Tributary‐Trunk Sedimentary Links in an Inter‐Dam River Reach: Lessons From Low‐Altitude High‐Gradient Forested Streams, the Dyje River (Czechia‐Austria)

open access: yesRiver Research and Applications, EarlyView.
ABSTRACT This study employs two measures of connectivity, valley confinement index (VCI) and effective catchment area (ECA), combined with a field survey of active sediment sources (ASS) to unravel the tributary‐trunk sedimentary links in the 42.5 km long inter‐dam reach of the Dyje River, Czech‐Austrian border.
Zdeněk Máčka   +5 more
wiley   +1 more source

Petrology of Oligocene Ghaleh Yaghmesh granitoids in the west of Yazd province

open access: yesJournal of Economic Geology, 2017
Introduction The generation and evolution of granitic magmas has been a hot debated subject among petrologists. The diversity of their origin has led different authors to propose that these rocks are not simple in their origin and might be generated in
Bahareh Fazeli   +4 more
doaj   +1 more source

Semi‐arid river dynamics from the internal geometry of river deposits

open access: yesGeographical Research, EarlyView.
This article aims to understand fluvial dynamics based on the internal geometry of fluvial deposits, using radar morphostratigraphy in floodplains, especially those whose genesis is associated with anthropogenic controls, such as upstream of dams.
Joana D’arc Matias de Almeida   +2 more
wiley   +1 more source

Archaeological Geology of Jurash, ʿAsīr Province, Southwestern Saudi Arabia

open access: yesArabian Archaeology and Epigraphy, EarlyView.
ABSTRACT The Jurash archaeological site is located on Wādī Bīshah near the city of Khamīs Mushayt in southwestern Saudi Arabia. It has a fort and other remains from the pre‐Islamic period (third century bc to early seventh century ad) and a settlement with two mosques from the Early Islamic period (early seventh to early 11th centuries ad).
James A. Harrell
wiley   +1 more source

The Case for a Cooperative Studio Classroom: Teaching Petrology in a Different Way [PDF]

open access: yes, 2005
NOTE: This file size is large, 16.52 mb. This article describes one educator's attempts to modify his Petrology course, changing the lab-lecture format to one that emphasizes studio and cooperative learning.
Dexter Perkins
core   +1 more source

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