Results 31 to 40 of about 5,193 (249)
Записки Горного института, 2022 The geological structure, structural relations with the underlying complexes, mineral composition, age and origin of sedimentary-volcanogenic and intrusive formations of the Chamberlain valley area (northern part of the Wedel Jarlsberg Land, Svalbard ...
Aleksandr N. Sirotkin +1 more
doaj +1 more source
, 2012 The North Chaoyang-Fuxin-Yixian granite-greenstone belt (NCFY-GGB) at the northern margin of the Eastern Continental Block of the North China Craton is composed chiefly of metamorphic volcanic and volcano-sedimentary rocks and granitoid gneisses.
Li, Q. +23 more
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On some aspects of the study of age ratios of rock complexes of the Ukrainian Shield
Геофизический журнал, 2020 The article discusses the applicability of stratigraphic dismemberment in the study of high-temperature metamorphic complexes of the Ukrainian Shield. The effectiveness of the stratigraphic method with respect to these complexes was called into question
V.P. Kyrylyuk
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, 2020 Aeolian systems of the Precambrian time were established in different palaeoclimatic and palaeogeographic conditions than the present. Different morphologies of dunes/draas, as linear, oblique and star forms, are widespread in the recent aeolian systems.
Soares, M.V.T. +2 more
core +1 more source
Chemostratigraphy of Neoproterozoic carbonates: implications for 'blind dating' [PDF]
, 2001 The delta C-13(carb) and Sr-87/Sr-86 secular variations in Neoproteozoic seawater have been used for the purpose of 'isotope stratigraphy' but there are a number of problems that can preclude its routine use.
Gorokhov, I.M. +8 more
core +1 more source
Geological Journal, EarlyView.A. Modeled T‐t paths for samples in the northern Ibex Hills, showing steady cooling throughout much of the Cenozoic, until rapid Miocene cooling. B. Weighted mean paths for each sample in this study. Note that all show a rapid cooling event at or just after 10 Ma, which is interpreted to represent exhumation as a result of regional extenstion ...
Zachariah D. Fleming
wiley +1 more source
Groundwater Occurrence in the Lower Palaeozoic and Precambrian Rocks of the UK: Implications for Source Protection [PDF]
Water and Environment Journal, 1999 ABSTRACTLower Palaeozoic and Precambrian rocks are distributed in Scotland, Northern Ireland, Cumbria, Wales and the Channel Islands, and coincide largely with upland areas. Groundwater flow and storage is mostly shallow and flow paths are short, although there is some limited deeper groundwater circulation.
openaire +2 more sources
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
Tanner, P.W.G., Evans, J.A.
core
Remarkable preservation of microbial mats in Neoproterozoic siliciclastic settings : Implications for Ediacaran taphonomic models [PDF]
, 2009 The authors thank Duncan McIlroy and Alex Liu for their discussions, help, comments and field support, the National Trust for access to Longmyndian localities, and the staff of the British Geological Survey Palaeontology unit and the Oxford University ...
Callow, Richard H. T. +4 more
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Notable Impact of Paleotectonic Stress on Gold Mineralisation in the West Qinling Orogen
Geological Journal, EarlyView.By applying fuzzy clustering and multiple inverse methods, we systematically processed the data of vein and fault slip in this ore deposit to reveal the transition of orogenic geological environment and paleotectonic stress field. Our research results show two different stress states: the northwest–southeast extensional stress field and the northeast ...
Hongyan Wang +3 more
wiley +1 more source