Results 61 to 70 of about 2,061 (160)

Hubungan Kondisi Geologi terhadap Alterasi Hidrotermal dan Mineralisasi pada Endapan Epitermal Daerah Bunikasih, Kecamatan Talegong, Kabupaten Garut, Provinsi Jawa Barat [PDF]

, 2013
Hydrothermal alteration is a changed in the mineral composition of the rock as a result of interaction of hydrothermal fluids with the wall rock involving various geological environments like fault zones and volcanic eruptions zones.
Nugroho, H. (Hadi), Rahmawati, S. (Saumi), Verdiansyah, O. (Okky), Widiarso, D. A. (Dian)   +3 more
core  

The provenance of Borneo's enigmatic alluvial diamonds:A case study from Cempaka, SE Kalimantan [PDF]

, 2016
Gem-quality diamonds have been found in several alluvial deposits across central and southern Borneo. Borneo has been a known source of diamonds for centuries, but the location of their primary igneous source remains enigmatic.
Atkinson, Barnes, Barron, Barron, Barron, Belousova, Bergman, Bergman, Bergman, Bernet, Black, Bosshart, Burgath, Carter, Carter, Claoué-Long, Clements, D. Tanner, Davies, Davies, Deighton, Eggins, Eggins, Eggins, Emmet, Evans, Fipke, G. Yaxley, Galbraith, Galbraith, Gleadow, Gordeev, Govindaraju, Graham, Granath, Green, Green, Griffin, Guntoro, Hall, Hall, Hall, Hall, Hamilton, Hartano, Hattori, Hattori, Hennig, I. Graham, Jaques, Jaques, Karpov, Katili, Kolff, Koolhoven, Krol, Krol, L. Barron, L. Spencer, L.T. White, Lister, Longerich, Ludwig, Ludwig, Metcalfe, Metcalfe, Metcalfe, Mitchell, Miyashiro, Muller, Nixon, Parkinson, Pidgeon, Pownall, Pownall, R. Hall, R.A. Armstrong, Ridd, Robinson, Rocholl, Sambridge, Seavoy, Shirey, Sigit, Sikumbang, Simandjuntak, Smit, Smith, Smyth, Smyth, Soeria-Atmajda, Spencer, Steiger, Sun, Swamidharma, T.M. van Leeuwen, Taylor, van Bemmelen, van Leeuwen, van Leeuwen, van Leeuwen, van Leeuwen, Vance, Wagner, White, White, Wiedenbeck, Williams, Win, Witts, Witts, Yang, Zientek   +112 more
core   +2 more sources

Opaline chert nodules in maar lake sediments from Camp dels Ninots (La Selva Basin, NE Spain) [PDF]

, 2017
Chert nodule samples from three different well cores (CC, CP1 & CA) from the lacustrine infill of the Camp dels Ninot maar-diatreme (La Selva Basin) have been studied by means of X-ray diffraction, and optical and electron microscope technique. The chert
Anadón, Pere, Caja, M. A., Ibáñez Insa, Jordi, Martín-Martín, J., Miró, Jordi, Oms, O., Tritlla, J.   +6 more
core  

Lunar Crater Volcanic Field (Reveille and Pancake Ranges, Basin and Range Province [PDF]

, 2017
The Lunar Crater volcanic field (LCVF) in central Nevada (USA) is domi­nated by monogenetic mafic volcanoes spanning the late Miocene to Pleisto­cene.
Andrew G. Harp, Aranda-Gómez, Ballmer, Bergman, Bolós, Brent Turrin, Christine Rasoazanamparany, Cimarelli, Cousens, Ekren, Elisabeth Widom, Eugene I. Smith, Friese, Gazel, Germa, Geshi, Greg A. Valentine, Hintz, Jason P. Briner, Joaquín A. Cortés, Johnson, Kempton, Le Corvec, Levander, McGee, Menand, Menzies, Muirhead, Racheal Johnsen, Re, Re, Reynolds, Schulte-Pelkum, Valentine, Winograd   +34 more
core   +1 more source

Basanite cobbles in Pleistocene sediments in Central Otago and their implications for intraplate volcanism and Clutha River paleo‐drainage

New Zealand Journal of Geology and Geophysics, Volume 67, Issue 4, Page 451-466, December 2024.
ABSTRACT The occurrence of volcanic basanite cobbles in Pleistocene terraces at Galloway and in the upper Clutha valley in Central Otago, in an area devoid of known volcanic edifices, has implications for Cenozoic intraplate volcanism and Pleistocene drainage in the region.
James M. Scott, Alan F. Cooper, Dave Craw, Petrus J. le Roux, Hayden B. Dalton, Marshall C. Palmer   +5 more
wiley   +1 more source

A late-Ordovician phreatomagmatic complex in marine soft-substrate environment: The Crozon volcanic system, Armorican Massif (France) [PDF]

, 2009
International audienceThe mafic lavas and the diabases of Crozon (Armorican Massif, France), belong to an anorogenic Ordovician volcanic complex, emplaced on a rifted passive margin in North Gondwana.
Bénard, Antoine, Caroff, Martial, Darboux, Jean-René, Vidal, Muriel   +3 more
core   +2 more sources

Confocal Raman spectroscopic study of melt inclusions from peridotite xenoliths in economic and barren kimberlites from Kaapvaal Craton

Journal of Raman Spectroscopy, Volume 55, Issue 10, Page 1090-1104, October 2024.
Olivine‐hosted secondary melt inclusions in xenoliths from five Kaapvaal craton kimberlites of variable diamond grade do not show difference in composition. The composition of 26 minerals identified in the daughter phases suggests carbonate melt rich in alkali, sulfur, chlorine, and phosphorus infiltrated the kimberlite xenoliths.
Sahroz Khan, Yana Fedortchouk, Monika Feichter, Tivadar M. Toth   +3 more
wiley   +1 more source

An Endogenic Origin for Titan's Rampart Craters: Assessment of Explosion Mechanisms

Journal of Geophysical Research: Planets, Volume 129, Issue 10, October 2024.
Abstract Rampart craters are a class of lakes or depressions in Titan's north polar region that have morphological attributes suggestive of an explosive origin. Two previous studies have proposed that rampart craters form via nitrogen or methane vapor explosions analogous to terrestrial maar explosions.
G. E. Brouwer, L. R. Schurmeier, S. A. Fagents   +2 more
wiley   +1 more source

Cretaceous fossils from the Orapa Diamond Mine [PDF]

, 1997
Main articleThe Orapa kimberlite pipe, situated in north-central Botswana, is well-known for its rich reserves of diamonds. It is indeed one of the largest and richest diamond mines in the world.
Bamford, M. K., Brothers, D. J., Dippenaar-Schoeman, A. S., McKay, I. J., Oberprieler, R. G., Rayner, R. J., Waters, S. B.   +6 more
core  

Cenozoic Volcanic Provinces and Shallow Asthenospheric Volumes in the Circum‐Mediterranean: Evidence From Magmatic Geochemistry, Seismic Tomography, and Integrated Geophysical‐Petrological Thermochemical Inversion

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 9, September 2024.
Abstract We compile an extensive catalog comprising geochemistry and ages of Cenozoic volcanic provinces in the Mediterranean region, distinguishing between three groups according to the geochemistry of magmatic rocks: intraplate (IVP), subduction‐related (SRVP), and mixed‐origin volcanic provinces (MVP; intraplate with subduction imprint). In order to
A. El‐Sharkawy, T. H. Hansteen, C. Clemente‐Gomez, J. Fullea, S. Lebedev, T. Meier   +5 more
wiley   +1 more source