Results 31 to 40 of about 623,895 (284)

Identification pyroclastic flow of magnetic minerals (Holocene volcano): A case study of paleo-volcano Lawu on the south side, Central Java, Indonesia

open access: yesKuwait Journal of Science, 2023
Indonesia is surrounded by three tectonic plates: the Eurasian, Indo−Australian, and Pacific plates. The plates have caused Indonesia to have many volcanoes, both active and inactive, resting, or no longer active.
Budi Legowo   +6 more
doaj   +1 more source

Paleomagnetism and rock magnetism as tools for volcanology

open access: yesBulletin of Volcanology, 2022
Paleomagnetic and rock magnetic methods for studying volcanoes and their products have been developed since the second half of the twentieth century.
G. Lerner, E. Piispa, J. Bowles, M. Ort
semanticscholar   +1 more source

A Geologic Si‐O‐C Pathway to Incorporate Carbon in Silicates

open access: yesGeophysical Monograph Series, Page 47-54., 2020

This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.

Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions

Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Alexandra Navrotsky   +2 more
wiley  

+1 more source

A stress-controlled mechanism for the intensity of very large magnitude explosive eruptions [PDF]

open access: yes, 2011
Large magnitude explosive eruptions are the result of the rapid and large-scale transport of silicic magma stored in the Earth's crust, but the mechanics of erupting teratonnes of silicic magma remain poorly understood.
Costa, Antonio   +3 more
core   +1 more source

Petrogenesis and geodynamic environment of the Recent pyroclastic deposits from Baïgom and Petpenoun volcanoes of the Noun Plain, Cameroon Volcanic Line, Central Africa

open access: yesGeosystems and Geoenvironment, 2023
This study presents petrography, mineral chemistry, whole-rock major and trace elemental systematics for Recent pyroclastic deposits from volcanic edifices of Baïgom and Petpenoun, located in the Noun Plain graben along the Cameroon Volcanic Line (CVL ...
Luc Achille Ziem A Bidias   +3 more
doaj   +1 more source

Stress level effect on mobility of dry granular flows of angular rock fragments

open access: yesLandslides, 2021
Granular flows of angular rock fragments such as rock avalanches and dense pyroclastic flows are simulated numerically by means of the discrete element method.
B. Cagnoli
semanticscholar   +1 more source

REE patterns for apatites from Proterozoic phosphatic metasediments, Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1983
Several occurrences of uranium- and apatite-bearing metasediments are known in the Precambrian of Finland. The characteristic rock types in the occurrences: metaphosphorite, apatite-bearing carbonate and calc-silicate rocks and apatite-quartz-feldspar ...
P. Rehtijärvi
doaj   +1 more source

Stiffness of pyroclastic scoriae under different degrees of saturation [PDF]

open access: yesE3S Web of Conferences
Pyroclasts are natural materials formed during volcanic eruptions, characterised by low densities due to their high porosity, which results in reticular, vesicular or mixed internal structures.
Molina-Gómez Fausto   +2 more
doaj   +1 more source

Data on unveiling the occurrence of transient, multi-contaminated mafic magmas inside a rhyolitic reservoir feeding an explosive eruption (Nisyros, Greece)

open access: yesData in Brief, 2022
This data article includes the description and the geochemical and mineralogical dataset of 67 pyroclastic rock samples from the Upper Pumice (UP) explosive activity of Nisyros volcano (eastern South Aegean Active Volcanic Arc).
F. Mastroianni   +6 more
doaj   +1 more source

Some Studies of New Zealand Quaternary Pyroclastic Rocks [PDF]

open access: yes, 2021
<p>The development of volcanic "ash" studies in New Zealand can be traced through three broad periods (Jeune 1970). During the late 19th century the extensive pumice deposits surrounding Lake Taupo received considerable comment (Crawford 1875, Smith 1876 and Cussen 1887).
openaire   +1 more source

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