Results 51 to 60 of about 106,884 (330)
Late Precambrian U-Pb titanite age for peak regional metamorphism and deformation (Knoydartian orogeny) in the western Moine, Scotland [PDF]
, 2003 There has been controversy over the number and timing of orogenies in the Precambrian Moine block in the Scottish Caledonides since the earliest radiometric dating in the 1960s. This work challenges a recent hypothesis, that this sector of the Laurentian
Evans, J.A., Tanner, P.W.G.
core +1 more source
Origin of a metamorphosed lithic clast in CM chondrite Grove Mountains 021536 [PDF]
, 2010 A metamorphosed lithic clast was discovered in the CM chondrite Grove Mountains 021536, which was collected in the Antarctica by the Chinese Antarctic Research Exploration team.
Guan, Yunbin +4 more
core +1 more source
Shock effects in plagioclase feldspar from the Mistastin Lake impact structure, Canada [PDF]
, 2015 Shock metamorphism, caused by hypervelocity impact, is a poorly understood process in feldspar due to the complexity of the crystal structure, the relative ease of weathering, and chemical variations, making optical studies of shocked feldspars ...
Flemming, Roberta L. +2 more
core +1 more source
Литосфера, 2017 The ophiolites of the northern slope of the Kuznetsk-Alatau Ridge are the most representative fragments of the sub-oceanic crust in the region. In this article, we present the results of a study of the metabasites from ophiolite paragenesis of the ...
N. A. Dugarova +3 more
doaj +1 more source
Reconstructing Nitrogen Sources to Earth’s Earliest Biosphere at 3.7 Ga
Frontiers in Earth Science, 2021 Earth’s sedimentary record has preserved evidence of life in rocks of low metamorphic grade back to about 3.2–3.5 billion years ago (Ga). These lines of evidence include information about specific biological metabolisms, permitting the reconstruction of ...
Eva E. Stüeken +5 more
doaj +1 more source
Remobilisation features and structural control on ore grade distribution at the Konkola stratiform Cu-Co ore deposit, Zambia [PDF]
, 2013 The Konkola deposit is a high grade stratiform Cu–Co ore deposit in the Central African Copperbelt in Zambia. Economic mineralisation is confined to the Ore Shale formation, part of the Neoproterozoic metasedimentary rocks of the Katanga Supergroup ...
Ague +78 more
core +1 more source
, 2019 IOTA opened recently a new line of research in distributed ledgers area by targeting algorithms that ensure a high throughput for the transactions generated in IoT systems. Transactions are continuously appended to an acyclic structure called tangle and each new transaction selects as parents two existing transactions (called tips) that it approves.
Bu, Gewu +2 more
openaire +3 more sources
Journal of Metamorphic Geology, Volume 41, Issue 1, Page 25-57, January 2023., 2023 Abstract The Variscan high‐grade metamorphic basement of northern Sardinia and southern Corsica record lower Carboniferous anatexis related to post‐collisional decompression of the orogen. Migmatites exposed in the Punta Bianca locality (Italy) consist of quartz + biotite + plagioclase + K‐feldspar orthogneisses, garnet and cordierite‐bearing diatexite
Leonardo Casini +6 more
wiley +1 more source
ORE GEOLOGY PROBLEMS AND THE HUMAN FACTOR. PART 4. METAMORPHISM AND MESOTHERMAL OREFORMATION
Известия Томского политехнического университета: Инжиниринг георесурсов, 2019 The relevance of the research. The conditions of the known large mesothermal gold deposits formation into black shales states of different age form the subject of animated discussion which often acquires the signs of substitute and probably therefore the
Igor V. Kucherenko
doaj +1 more source
U-Th-Pb zircon geochronology on igneous rocks in the Toija and Salittu Formations, Orijärvi area, southwestern Finland: Constraints on the age of volcanism and metamorphism [PDF]
Bulletin of the Geological Society of Finland, 2008 Zircons from a felsic volcanic rock in the Toija Formation and a synvolcanic gabbro intrusion in the Salittu Formation within the Orijärvi area were dated by U-Th-Pb SIMS in order to provide depositional constraints on these formations.
M. Väisänen, C.L. Kirkland
doaj +1 more source