Results 31 to 40 of about 21,265 (256)

Oxygen-isotope and trace element constraints on the origins of silica-rich melts in the subarc mantle [PDF]

, 2007
Peridotitic xenoliths in basaltic andesites from Batan island in the Luzon arc contain silica-rich (broadly dacitic) hydrous melt inclusions that were likely trapped when these rocks were within the upper mantle wedge underlying the arc.
Eiler, J. M., Kita, N. T., Schiano, P., Stolper, E. M., Valley, J. W.   +4 more
core   +4 more sources

Nanodiamond Finding in the Hyblean Shallow Mantle Xenoliths [PDF]

Scientific Reports, 2015
AbstractMost of Earth’s diamonds are connected with deep-seated mantle rocks; however, in recent years, μm-sized diamonds have been found in shallower metamorphic rocks and the process of shallow-seated diamond formation has become a hotly debated topic. Nanodiamonds occur mainly in chondrite meteorites associated with organic matter and water.
S. K. Simakov, A. Kouchi, N. N. Mel’nik, SCRIBANO V, Y. Kimura, T. Hama, N. Suzuki, H. Saito, T. Yoshizawa   +8 more
openaire   +4 more sources

Eruption Age of a ~100,000-Year-Old Basalt From ^(40)Ar-^(39)Ar Analysis of Partially Degassed Xenoliths [PDF]

, 1984
We have applied ^(40)Ar-^(39)Ar dating, using stepwise thermal extraction of Ar, to five potassium-rich granitic xenoliths and their host basalt from Sawmill Canyon in the Sierra Nevada, California.
Gillespie, A. R., Huneke, J. C., Wasserburg, G. J.   +2 more
core   +1 more source

A Paleotectonic Atlas of the African Plate: Permian to Recent

Journal of Petroleum Geology, EarlyView.
ABSTRACT The fragmentary release of petroleum data defining the deep structure and stratigraphy of African basins has been integrated with existing literature to compile 19 tectonic maps over key geological intervals from Permian to Recent times. African plate margins range in their age of opening from Late Triassic (off Lebanon), through Early/Middle ...
Duncan S. Macgregor, Colin V. Reeves
wiley   +1 more source

Active megadetachment beneath the western United States [PDF]

, 2008
Geodetic data, interpreted in light of seismic imaging, seismicity, xenolith studies, and the late Quaternary geologic history of the northern Great Basin, suggest that a subcontinental-scale extensional detachment is localized near the Moho.
Allmendinger, Anders, Axen, Beaumont, Beghoul, Bell, Bell, Bennett, Bennett, Bennett, Bergman, Bergman, Berthe, Bills, Block, Brace, Brian Wernicke, Brodie, Brodie, Brodie, Buck, Buck, Burchfiel, Caskey, Catchings, Christiansen, Christiansen, Cook, Davis, Davis, Davis, DeCelles, Demouchy, dePolo, Dixon, Dokka, Dragert, Ducea, Ducea, Dueker, Dumond, Elósegui, England, England, Flack, Flesch, Flesch, Fountain, Fountain, Frankel, Freed, Friedrich, Friedrich, Gan, Gashawbeza, Glazner, Goetze, Gourmelen, Gripp, Gripp, Hales, Hammond, Hammond, Hauge, Hauser, Hetland, Hey, Hey, Hirth, Hobbs, Hobbs, Holbrook, Holbrook, Humphreys, Humphreys, Humphreys, Jackson, James L. Davis, Jarchow, Jones, Jordan, Katayama, Kelemen, Klemperer, Klemperer, Kostoglodov, Kruse, Lachenbruch, Le Pourhiet, Lee, Lerch, Liu, Louie, Lowry, Lowry, Lowry, Luedke, Machette, Maggi, McGeary, McKenzie, McKenzie, McQuarrie, Melbourne, Melbourne, Miller, Miller, Molnar, Nathan A. Niemi, Niemi, Okada, Oldow, Oldow, Oldow, Pancha, Park, Parsons, Passchier, Peter Luffi, Pollitz, Potter, Regenauer-Lieb, Regenauer-Lieb, Reheis, Reston, Roy, Rutter, Saleeby, Saltzer, Savage, Schellart, Schellart, Silver, Silver, Smith, Smith, Smith, Smith, Snoke, Sonder, Sonder, Sonder, Stewart, Suetnova, Sunil Bisnath, Suppe, Taber, Tapponnier, Thatcher, Thatcher, Thompson, Thompson, Usui, Waite, Walker, Wallace, Wallace, Wang, Watts, Weinberg, Wernicke, Wernicke, Wernicke, Wernicke, Wernicke, Wesnousky, Wesnousky, Wesnousky, Wilson, York, Zandt, Zandt, Zandt   +172 more
core   +2 more sources

A primitive asteroid that lived fast and died young sampled by a xenolith in the Cold Bokkeveld CM2 carbonaceous chondrite

Meteoritics &Planetary Science, Volume 60, Issue 3, Page 464-483, March 2025.
Abstract Xenoliths in carbonaceous chondrites include lithologies that are unrepresented in the meteorite record and so are a rich source of information on asteroid diversity. Cold Bokkeveld is a CM2 regolith breccia that contains both hydrous and anhydrous lithic clasts. Here, we describe a hydrous clast with a fine‐grained rim.
Martin R. Lee, Cameron J. Floyd, Robin Haller, Sammy Griffin   +3 more
wiley   +1 more source

Magnesium phosphate in the Cold Bokkeveld (CM2) carbonaceous chondrite

Meteoritics &Planetary Science, EarlyView.
Abstract Hydrous Mg‐phosphate was first described from astromaterials in particles returned from the C‐type asteroid Ryugu, and has subsequently been found in samples of the B‐type asteroid Bennu and CI1 carbonaceous chondrites. This phase may have been highly significant as a source of bioessential compounds for early Earth.
Martin R. Lee, Tobias Salge, Ian Maclaren   +2 more
wiley   +1 more source

EarthScope [PDF]

, 2002
EarthScope applies modern observational, analytical, and telecommunications technologies to investigate the structure and evolution of the North American continent and the physical processes controlling earthquakes and volcanic eruptions.
Michelle Hall-Wallace
core   +1 more source

Olivine fabric and microstructure in Northwest Africa (NWA) 7059 and Nova 018: Insights into ureilite deformation

Meteoritics &Planetary Science, EarlyView.
Abstract Olivine is a major constituent in ureilites and commonly defines macroscopic fabric via shape‐preferred orientation of elongate grains. In this study, we examined olivine fabric (crystallographic preferred orientation, or CPO) and microstructures in the unbrecciated olivine‐pigeonite ureilites Northwest Africa (NWA) 7059 and Nova 018 using ...
A. I. Sheen, C. K. F. Tirona, K. T. Tait, L. F. White, B. C. Hyde, S. Korchinos   +5 more
wiley   +1 more source

Fe Oxidation State and Oxygen Isotope Composition of Diverse Metasomatized Peridotite Rocks

Terra Nova, EarlyView.
ABSTRACT Metasomatic fluids are thought to be oxidising agents that react with the surrounding mantle rocks, causing changes in the bulk Fe3+/ΣFe, their redox state, and affecting the partitioning of trace elements and the fractionation of O isotopes. Worldwide distributed metasomatized peridotites represent the ideal case study to investigate the role
Federica Benedetti, Giulia Marras, Enrico Cannaò, Gianluca Bianchini, Daniele Brunelli, Luigi Dallai, Vincenzo Stagno   +6 more
wiley   +1 more source