Results 21 to 30 of about 13,474 (226)

Magmatic characteristics and crystallization condition of the Gasht- Masuleh gabbros (North of Iran) based on clinopyroxene and orthopyroxene composition [PDF]

open access: yesپترولوژی, 2019
The Alborz Range, as a part of the Alpine-Himalayan orogeny, formed during the Cimmerian orogeny due to northward movements of the Central Iran micro-plate towards Eurasia.
Leila Rezaei   +2 more
doaj   +1 more source

Radiometric Constraints on the Timing, Tempo, and Effects of Large Igneous Province Emplacement

open access: yesGeophysical Monograph Series, Page 27-82., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Jennifer Kasbohm   +2 more
wiley  

+1 more source

Thermobar: An open-source Python3 tool for thermobarometry and hygrometry

open access: yesVolcanica, 2022
We present Thermobar, a new open-source Python3 package for calculating pressures, temperatures, and melt compositions from mineral and mineral-melt equilibrium.
Penny Wieser   +6 more
doaj   +1 more source

Uralitization – An example from Kuusamo, Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1977
The course of events as well as the chemical changes associated with the alteration of clinopyroxenes to uralite have been studied from diabases in Kuusamo, Finland.
R. Piispanen, T. Alapieti
doaj   +1 more source

GEOCHEMICAL FEATURES OF SULFIDES OF THE AKTASH MAGNETITE-POLYMETALLIC DEPOSIT, WESTERN KARAMAZAR, TAJIKISTAN (LA-ICP-MS DATA) [PDF]

open access: yesМинералогия, 2023
The distribution of trace elements in sulfides from various ores of the Aktash magnetitepolymetallic deposit (Tajikistan) is studied using LA-ICP-MS method. Sulfides partly replace banded magnetite ores.
U.A. Yatimov   +2 more
doaj   +1 more source

Variations in the Near‐Infrared Spectral Properties of Ferrous Mineral Mixtures With Different Relative Abundances

open access: yesEarth and Space Science, 2021
In near‐infrared spectral studies, the relationship between the 1‐μm absorption (Band I) center and the band area ratio (BAR, the area ratio of 2–1‐μm absorption features) is useful in compositional and mineralogical analyses of ferrous mineral‐bearing ...
Xunyu Zhang, Edward Cloutis
doaj   +1 more source

The role of complexing agents in the flotation of pentlandite-pyroxene mixtures [PDF]

open access: yes, 2003
Bibliography: leaves 137-146.This study examines the role complexing agents play in pentlandite-pyroxene flotation and focuses on the surface chemistry and interaction between valuable and gangue minerals as well as the interaction of complexing agents ...
Shackleton, Natalie Jean
core   +1 more source

Investigation of the surface properties of gangue minerals in PGM bearing ores [PDF]

open access: yes, 2005
Bibliography: leaves 90-95.The recovery of Platinum Group Minerals (PGM) and associated sulphides by froth flotation from the Bushveld Igneous Complex is complicated by the presence of naturally floatable gangue minerals such as talc.
Martinovic, Jasmina
core   +1 more source

​40Ar/39Ar geochronology of terrestrial pyroxene

open access: yes, 2018
Geochronological techniques such as U/Pb in zircon and baddeleyite and 40Ar/39Ar on a vast range of minerals, including sanidine, plagioclase, and biotite, provide means to date an array of different geologic processes.
Ware, B.   +3 more
core   +2 more sources

Mineralogy and Petrology of an Olivine Diabase Sill Complex and Associated Unusually Potassic Granophyres, Sierra Ancha, Central Arizona [PDF]

open access: yes, 1969
The Precambrian Sierra Ancha sill complex, 700 to 800 feet thick, was intruded into flat-lying sedimentary rocks of the Apache Group in central Arizona. The bulk of the complex consists of a central layer of feldspathic olivine-rich diabase and upper and
Smith, Douglas
core   +1 more source

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