Results 91 to 100 of about 19,778 (275)

Plagioclase as recorder of magma chamber processes in the Deccan Traps: Sr-isotope zoning and implications for Deccan eruptive event

, 2014
Deccan Trap flood basalt volcanism reached its peak 65.5(±1)millionyears ago, giving rise to a 2.7km thick lava pile that formed the Western Ghats range near Mumbai.
Wolff, John A., Chandrasekharam, D., Borges, Melory R., Sen, Gautam, Hart, Garret L.   +4 more
core   +1 more source

P–T Modelling Constrains the Depth of Emplacement of the Porto Azzurro Pluton and Implies Minor Exhumation Caused by the Zuccale Fault (Island of Elba, Italy)

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Understanding the pressure of emplacement of granitic intrusions is crucial to understanding the exhumation history of plutons and constraining the tectonic setting of magma emplacement. However, P–T and geochronological constraints from exhumed plutons are often characterized by large uncertainties, especially in shallow crustal settings with
Samuele Papeschi, Marco Bonini, Matteo Lupi, Chiara Del Ventisette, Domenico Montanari   +4 more
wiley   +1 more source

Plagioclase-alkali feldspar geothermometry revisited

, 1977
SUMMARY, The plagioclase-alkali-feldspar geothermometer formulated by Stormer 0975) does not take into account the effect of small amounts of calcium in the alkali feldspar.
Marjorie Powell, Roger Powell
core   +1 more source

Reaction‐Driven Development of Fine‐Grained Plagioclase Networks Influences the Rheology of the Crust in the Bergen Arcs, Norway

Journal of Metamorphic Geology, EarlyView.
ABSTRACT In the middle to lower continental crust, mineral reactions can play a key role in controlling rheological behaviour by generating fine‐grained, mechanically weak domains. In granulite‐facies rocks from Krossøy (Bergen Arcs, Norway), we document how garnet breakdown produced interconnected networks of orthopyroxene + plagioclase ± spinel that ...
Lorena H. Filiberto, Håkon Austrheim, José Alberto Padrón‐Navarta, Andrew Putnis, Christine V. Putnis   +4 more
wiley   +1 more source

(Tabel S5b) Plagioclase-hosted melt inclusions, host plagioclase composition adjacent to inclusion, and thermobarometry of melt inclusion - host mineral pairs

, 2018
(Tabel S5b) Plagioclase-hosted melt inclusions, host plagioclase composition adjacent to inclusion, and thermobarometry of melt inclusion - host mineral ...
Melanie Siegburg (6968786), Bach, Wolfgang, Rocholl, Alexander, Wolfgang Bach (6960488), Klügel, Andreas, Alexander Rocholl (5480873), Siegburg, Melanie, Andreas Klügel (6968789)   +7 more
core   +1 more source

New knowledge about shock events that affected the L‐chondrite parent body from two heavily shocked L6 meteorite finds

Meteoritics &Planetary Science, EarlyView.
Abstract We report new results from a study of shock‐related features in the L6 ordinary chondrites Northwest Africa (NWA) 4672 and NWA 12841. Our observations confirm the occurrence of eight high‐pressure (HP) minerals in each meteorite, namely, ringwoodite, majorite, akimotoite, wadsleyite, albitic jadeite, lingunite, tuite, and xieite.
I. Baziotis, L. Ferrière, C. Ma, J. Hu, D. Palles, P. D. Asimow   +5 more
wiley   +1 more source

(Table 6) Representative plagioclase compositions of plagioclase-phyric chilled margins and microdikes of ODP Hole 140-504B

, 1995
(Table 6) Representative plagioclase compositions of plagioclase-phyric chilled margins and microdikes of ODP Hole 140 ...
Andrew W McNeill (6973100), McNeill, Andrew W   +1 more
core   +1 more source

Determining impact angle from the spatial distribution of shock metamorphism: A case study of the Gosses Bluff (Tnorala) impact structure, Australia

Meteoritics &Planetary Science, EarlyView.
Abstract The majority of planetary impacts occur at oblique angles. Impact structures on Earth are commonly eroded or buried, rendering the identification of the direction and angle of impact—using methods such as asymmetries in ejecta distribution, surface topographic expression, central uplift structure, and geophysical anomalies—challenging. In this
Eloise E. Matthews, Auriol S. P. Rae, Thomas Kenkmann, Nicholas E. Timms, Aaron J. Cavosie, Marian B. Holness   +5 more
wiley   +1 more source

(Table 1) Modal composition of olivine-plagioclase phyric and plagioclase phyric basalts at DSDP Leg 67 Holes

, 1982
(Table 1) Modal composition of olivine-plagioclase phyric and plagioclase phyric basalts at DSDP Leg 67 ...
Yuri I Dmitriev (6887309), Dmitriev, Yuri I   +1 more
core   +1 more source

Vertical profiling of shock attenuation at the Rochechouart impact structure, France

Meteoritics &Planetary Science, EarlyView.
Abstract Rochechouart, south‐west France, is a complex impact structure. Here, we present the first report of shock barometry of quartz from what are likely parautochthonous basement units at depth, based on samples from the 2017 C.I.R.I.R drilling campaign. The crystallographic orientations of 725 sets of PDFs in 512 quartz grains in samples from four
P. Struzynska, S. Alwmark, C. Alwmark, M. H. Poelchau, P. Lambert   +4 more
wiley   +1 more source