Results 61 to 70 of about 32,111 (286)

Petrology and mineralogy of the Viñales meteorite, the latest fall in Cuba

Science Progress, 2021
The new Cuban chondrite, Viñales, fell on February first, 2019 at Pinar del Rio, northwest of Cuba (22°37′10″N, 83°44′34″W). A total of about 50–100 kg of the meteorite were collected and the masses of individual samples are in a range 2–1100 g.
Feng Yin, Deqiu Dai
doaj   +1 more source

High-temperature water–rock interactions and hydrothermal environments in the chondrite-like core of Enceladus

Nature Communications, 2015
It has been suggested that Saturn’s moon Enceladus possesses a subsurface ocean. The recent discovery of silica nanoparticles derived from Enceladus shows the presence of ongoing hydrothermal reactions in the interior.
Y. Sekine, T. Shibuya, F. Postberg, H. Hsu, Katsuhiko Suzuki, Y. Masaki, T. Kuwatani, M. Mori, P. Hong, Motoko Yoshizaki, S. Tachibana, S. Sirono   +11 more
semanticscholar   +1 more source

Late Pleistocene Volcanic Rocks From Tengchong Volcanic Field at SE Tibetan Plateau: Constraints on Petrogenesis and Mantle and Crustal Processes

Geological Journal, EarlyView.
Early zircon saturation and crystallisation occur in mafic (52–54 wt.% SiO2) lavas at Tengchong volcanic field. These early formed zircons with high δ18O (6.6‰–7.9‰) indicates mantle enrichment by subducted supracrustal materials. ABSTRACT Late Pleistocene (< 0.2 Ma) mafic and evolved volcanic rocks occur in northern Tengchong Volcanic Field, SE ...
Lizhu Wang, Haibo Zou
wiley   +1 more source

Pb-Pb dating of individual chondrules from the CBa chondrite Gujba: Assessment of the impact plume formation model

Meteoritics and Planetary Science, 2015
The CB chondrites are metal‐rich meteorites with characteristics that sharply distinguish them from other chondrite groups. Their unusual chemical and petrologic features and a young formation age of bulk chondrules dated from the CBa chondrite Gujba are
J. Bollard, James N. Connelly, M. Bizzarro   +2 more
semanticscholar   +1 more source

Geochemical Characteristics and Their Geological Significance of Zircon and Apatite From the Wunugetushan Porphyry Cu–Mo Deposit, Inner Mongolia, NE China

Acta Geologica Sinica - English Edition, EarlyView.
The key factors making the monzogranitic porphyry fertile for mineralization, including its high Cl, S, and H2O contents, high oxidation state, significant fluid exsolution, and multiple recharges of deep‐seated mafic magma, were all critical for the formation of the Wunugetushan porphyry Cu‐Mo deposit. ABSTRACT The Wunugetushan (Wushan) porphyry Cu–Mo
Genyuan JI, Sihong Jiang, Yang Cheng, Hongyan Bao, Huachuan Zhang   +4 more
wiley   +1 more source

Transmission electron microscopy analysis of shock veins in the meteorite Jesenice

Geologija
Meteorite Jesenice is a weakly (S3) shocked ordinary chondrite from Slovenia. The shock event was violent enough to cause localized partial melting of the meteorite and the formation of shock veins.
Bojan Ambrožič, Sašo Šturm, Mirijam Vrabec   +2 more
doaj   +1 more source

An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites

Progress in Earth and Planetary Science, 2021
Almahata Sitta is a polymict breccia, consisting of many kinds of clasts. Here we present our mineralogical and petrological results on an EL3 fragment, MS-177 from Almahata Sitta.
M. Kimura, M. K. Weisberg, A. Takaki, N. Imae, A. Yamaguchi   +4 more
doaj   +1 more source

Procurement of Senonian Flint for Bladelets Production at the Early PPNB Site of Nahal Zahal in the Northern Negev Established for the First Time Using Chemical Composition Analysis

Archaeometry, EarlyView.
ABSTRACT The hypotheses of Senonian flint to be a prime source of prehistoric “chalcedony” flint artefacts from the Negev Desert (Israel) was not investigated in detail thus far. By combining trace‐element profiling with statistical interpretation, ten flint items from Nahal Zahal, an Early Pre‐Pottery Neolithic B site in the northern Negev, were ...
Meir Finkel, Michal Birkenfeld, Talia Abulafia, Keren Weiss‐Sarusi, Olga Berlin, Yoav Ben Dor   +5 more
wiley   +1 more source

Characterising primitive chondrite components [PDF]

, 2011
Primitive chondrite components in six carbonaceous chondrites, Bencubbin, HaH 237, Gujba, Isheyevo, Acfer 209 and Acfer 094 were studied to examine the complex thermal histories of individual particles.
Duffy, Christina Mary
core   +2 more sources

Iridium anomaly in the cretaceous-paleogene boundary at Højerup (Stevns Klint, Denmark) and Woodside Creek (New Zealand): The question of an enormous proportion of extraterrestrial component [PDF]

Journal of the Serbian Chemical Society, 2012
The Cretaceous-Paleogene boundary clays at Højerup and Woodside Creek show anomalous enrichments of iridium compared with the marine sedimentary rocks.
Premović Pavle I., Ilić Budimir S., Đorđević Miloš G.   +2 more
doaj   +1 more source