Results 21 to 30 of about 23,609 (212)

Geologic interpretation of a radar mosaic of Yellowstone National Park [PDF]

, 1969
Geologic mapping of Yellowstone National Park area by interpretation of radar ...
Prostka, H. J.
core   +2 more sources

Petrogenesis of the Late Cretaceous Rhyolites in the Changtang Basin, Northern Guangdong: Constraints from Geochemistry and Sr-Nd-Pb-Hf-O Isotopes

Yankuang ceshi, 2016
Changtang rhyolite is the acidic end-member of asymmetric bimodal volcanic rock association, which is composed mainly of amounts of rhyolite and minor basalt.
LAO Yu-jun, WU Jian-hua, XU Xun-sheng
doaj   +1 more source

Fracture toughness of schist, amphibolite, and rhyolite from the Sanford Underground Research Facility (SURF), Lead, South Dakota

Scientific Reports, 2022
The Cracked Chevron Notched Brazilian Disc (CCNBD) method was selected for Mode I fracture toughness tests on Poorman schist, Yates amphibolite, and rhyolite dikes from the EGS Collab site at the SURF in Lead, South Dakota.
Ben Jahnke, Casey Ruplinger, Charlotte E. Bate, Maciej Trzeciak, Hiroki Sone, Herbert F. Wang   +5 more
doaj   +1 more source

Halogen (Cl, F) release during explosive, effusive, and intrusive phases of the 2011 rhyolitic eruption at Cordón Caulle volcano (Chile)

Volcanica, 2019
We investigate sulphur, chlorine and fluorine release during explosive, effusive and intrusive phases the 2011 Cordón Caulle eruption, with a focus on halogen devolatilization. Petrological analysis shows halogen release to have been promoted by isobaric
C Ian Schipper, Jonathan M Castro, Ben M Kennedy, Bruce W Christenson, Alessandro Aiuppa, Brent Alloway, Pablo Forte, Gilles Seropian, Hugh Tuffen   +8 more
doaj   +1 more source

Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane [PDF]

, 2015
The Precordillera terrane in northwestern Argentina is interpreted to be anexotic (Laurentian) continental fragment that was accreted to western Gondwanaduring the Ordovician. One prominent manifestation of the subductionand collision process is a Middle?
Astini, Ricardo Alfredo, McClelland, William C., Mueller, Paul A., Thomas, William A.   +3 more
core   +1 more source

Recycling of the Proterozoic crystalline basement in the Coastal Block (Moroccan Meseta): New insights for understanding the geodynamic evolution of the northern peri-Gondwanan realm [PDF]

, 2018
Detrital zircon age spectra from the siliciclastic rocks of the Lalla Mouchaa Calcschists and El Jadida Dolomitic formations (the Coastal Block of the Moroccan Meseta) are dominated by Paleoproterozoic and Ediacaran ages.
El Attari, Ahmed, El Houicha, Mohamed, Ennih, Nasser, Ezzouhairi, Hassan, Fekkak, Abdelilah, Gama, Cristina, Jouhari, Abdellatif, Pereira, Manuel Francisco, Silva, Jose Brandão   +8 more
core   +1 more source

The Petrology of the Wong Tei Tung Stone Tool Manufacturing Site, Sham Chung, Hong Kong Sar, China

Internet Archaeology, 2009
The Wong Tei Tung archaeological site was discovered in 2003. Two periods have been proposed: an earlier period dating to around 40,000 years bp, and a later period dating to around 7000 years bp, but these dates should be treated cautiously.
Vin Davis, Rob Ixer
doaj   +1 more source

Pressure-Driven Opening and Filling of a Volcanic Hydrofracture Recorded by Tuffisite at Húsafell, Iceland: A Potential Seismic Source

Frontiers in Earth Science, 2021
The opening of magmatic hydraulic fractures is an integral part of magma ascent, the triggering of volcano seismicity, and defusing the explosivity of ongoing eruptions via outgassing magmatic volatiles.
Holly E. Unwin, Hugh Tuffen, Emrys Phillips, Fabian B. Wadsworth, Mike R. James   +4 more
doaj   +1 more source

Rock Procurement in the Early Neolithic in Southern Norway – Significance by Association with People and Places?

Current Swedish Archaeology, 2016
Rocks and places of rock procurement can be sig- nificant beyond pragmatic reasons. In the Early Ne- olithic in southern Norway, specific rock types and quarries appear to have been deeply entangled in socio-political strategies that either bound people
Astrid J. Nyland
doaj   +1 more source

Paleozoic magmatism in the southwest of Julfa (northwestern Iran): geochemical characteristics, U-Pb dating and tectonic setting [PDF]

پترولوژی, 2019
Extensive sedimentary- igneous rock associations of Paleozoic age crop out in southwest of Julfa (northwest of Iran). Geochemically, the igneous rocks display various basic to acidic compositions.
morteza delavari, Fatemeh Arab Asadi, Ali Mohammadi   +2 more
doaj   +1 more source