Results 51 to 60 of about 2,061 (160)

Spectroscopy of Moses Rock Kimberlite Diatreme [PDF]

, 1985
Three types of remote sensing data (Airborne Imaging Spectroscopy (AIS), NS001, Zeiss IR-photographs) were obtained for the Moses Rock kimberlite dike in southern Utah.
Mustard, J. F., Pieters, C. M.
core   +1 more source

Contemporaneous alkaline and subalkaline intraplate magmatism in the Dunedin Volcanic Group, NZ, caused by mantle heterogeneity

New Zealand Journal of Geology and Geophysics, Volume 68, Issue 1, Page 95-119, March 2025.
ABSTRACT Monogenetic volcanism in the Maniototo Basin in the Dunedin Volcanic Group was unusual because the eroded lavas, plugs and dikes comprise spatially and temporally restricted silica‐saturated and silica‐undersaturated magmas. 40Ar/39Ar dating coupled with existing data and field relationships indicate that volcanism was focused at ∼11 Ma. Major
Laura J. E. Wilson, E. Giacalone, James M. Scott, Marco Brenna, James D. L. White, Petrus J. le Roux, Sidney R. Hemming, Marshall C. Palmer, Stephen E. Read, Malcolm R. Reid, Claudine H. Stirling   +10 more
wiley   +1 more source

Follow the CO₂ – drilling into an actively degassing intraplate volcano underlain by a silicate–carbonatite intrusion [PDF]

Scientific Drilling
The Eifel region of Germany hosts hundreds of distributed volcanoes of Quaternary age in an intracontinental setting. This includes many maar volcanoes, for which the Eifel is the type locality.
T. Dahm, T. Dahm, A. K. Schmitt, S. de Silva, T. Fischer, A. Holzheid, N. Kukowski, Y. Lavallee, A. Sturm, J. Troch   +9 more
doaj   +1 more source

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics [PDF]

, 2006
Anorogenic intra-plate magmatism was widespread in Europe from early Tertiary to Recent times, extending west to east from Spain to Bulgaria, and south to north from Sicily to northern Germany. Magmatism is spatially and temporally associated with Alpine-
Downes, Hilary, Wilson, M.
core   +1 more source

Possible Diatremes, Hay Region, NSW [PDF]

ASEG Extended Abstracts, 2007
The New Frontiers exploration initiative of the NSW government has implemented the analysis of regional geophysical datasets for the Ana Branch, Pooncarie, Booligal, Balranald, Hay and Deniliquin 1:250 000 map sheet areas. The aspiration is to encourage exploration in regional areas by extrapolating the geology beneath covered areas using regional ...
openaire   +1 more source

The Lages diatremes: mineral composition and petrological implications [PDF]

Anais da Academia Brasileira de Ciências, 2007
Chemical data of heavy minerals from Lages diatremes in southern Brazil have been studied with the aim of characterizing the sample source(s). Three groups of minerals are recognized: I) aluminian-chromian pyroxene, pyrope garnet and chromian spinel, which represent disaggregated fragments of spinel, spinel+garnet and garnet facies peridotite; II) low ...
Barabino, Giancarlo, Gomes, Celso B., Traversa, Gianbosco   +2 more
openaire   +6 more sources

CO2‐Rich Xenoliths at Mt. Vulture Volcano (Southern Italy): New Constraints on the Volcano Plumbing System

Terra Nova, Volume 37, Issue 1, Page 41-48, February 2025.
ABSTRACT This study provides new mineral chemistry data together with micro‐thermometric measurements on fluid inclusions hosted in ultramafic xenoliths (lherzolite, wehrlite, and dunite) brought to the surface by the last Mt. Vulture volcano activity (140 ka; southern Italy), and fed by melilitite‐carbonatite magmas.
Gabriele Carnevale, Antonio Caracausi, Massimo Coltorti, Barbara Faccini, Giulia Marras, Michele Paternoster, Silvio G. Rotolo, Vincenzo Stagno, Vittorio Zanon, Filippo Zummo   +9 more
wiley   +1 more source

Relative age of Cordilleran base metal lode and replacement deposits, and high sulfidation Au-(Ag) epithermal mineralization in the Colquijirca mining district, central Peru [PDF]

, 2018
At Colquijirca, central Peru, a predominantly dacitic Miocene diatreme-dome complex of 12.4 to 12.7Ma (40Ar/39Ar biotite ages), is spatially related to two distinct mineralization types.
Bendezú, Ronner, Cosca, Mike, Fontboté, Lluís   +2 more
core  

Evidence for the Neoproterozoic Rifting of Rodinia in the Rocky Mountain Front Range

Tectonics, Volume 44, Issue 1, January 2025.
Abstract Recent advances in low‐temperature thermochronology enable the recovery of deep‐time thermal histories from Precambrian crystalline rocks shaped by multiple tectonic events, offering unprecedented opportunities to test tectonic hypotheses and links to significant biologic and climatic episodes. In particular, the late Neoproterozoic breakup of
Kendra E. Murray, Nathan A. Niemi, Marin K. Clark   +2 more
wiley   +1 more source

Origin of Ultrapotassic, Ultracalcic, Ultrabasic SiO2‐Undersaturated Magmas: The Case Study of the Pleistocene Cupaello Kamafugite Monogenetic Volcano, Central Italy

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 1, January 2025.
Abstract The Pleistocene (∼0.6 Ma) Cupaello monogenetic volcano, cropping out in central Italy, belongs to the Intra Apennine Province (IAP). It is represented by a single lava flow with kamafugitic composition, associated with a volumetrically limited pyroclastic deposit and a phosphate‐rich layer close to the small vent.
Michele Lustrino, Lorenzo Pistocchi, Sara Ronca, Francesca Innocenzi, Samuele Agostini   +4 more
wiley   +1 more source