Results 61 to 70 of about 17,986 (209)
Talc‐Tempered Pottery From Bala Hissar, Kabul: An Analytical Study
Archaeometry, EarlyView.ABSTRACT Potsherds of cooking ware excavated at Bala Hissar archaeological site in Kabul were studied using X‐ray fluorescence (XRF), scanning electron microscope‐energy dispersive X‐ray spectrometry (SEM‐EDS), Raman spectroscopy, X‐ray powder diffraction (XRPD), thermogravimetric analysis (TGA) and optical microscopy.
Parviz Holakooei +4 more
wiley +1 more source
A possible model of the Paleozoic sedimentary basins evolution at the North African platform
Известия высших учебных заведений: Геология и разведка, 2017 A dual model of the Paleozoic basins development, disposing on the Late Proterozoic (Pan-African) and the Early Proterozoic (Eburnean) crust, has been proposed.
M. Sh. Zamil
doaj +1 more source
Criteries and prospects of diamonds of the Vitebsk granulite massif
Журнал Белорусского государственного университета: География, геология, 2021 The article describes the history of studying the diamond content of tectonic structures of the territory of Belarus. Based on the results of magnetometric, mineralogical, tectonic studies carried out by industrial geologists and scientists over the past
Victor S. Konishchev +1 more
doaj +1 more source
Re-Os geochronology and geochemistry of Proterozoic sedimentary successions [PDF]
, 2011 The Re-Os organic-rich sedimentary rocks (ORS) geochronometer has the potential to provide precise depositional ages and vital information on the Os isotope composition of palaeo-seawater.
ROONEY, ALAN
core
The Himmerkinlahti member: An indicator of intra-karelian erosion within the early Proterozoic Kuusamo Belt, Posio, northern Finland [PDF]
Bulletin of the Geological Society of Finland, 2000 The paper establishes the Himmerkinlahti Member, which is a thin metamorphosed conglomerate-sandstone unit within the middle part of the early Proterozoic (Karelian) supracrustal sequence of the Kuusamo Belt, northern Finland.
K. Laajoki
doaj +1 more source
Terra Nova, EarlyView.ABSTRACT Thin, discontinuous, organic‐rich oil shale beds in the siliciclastic‐evaporitic Salt Range Formation (SRF) of Pakistan are of approximate Neoproterozoic to Cambrian age based on stratigraphic constraints. The beds are enriched (26–43 wt.% total organic carbon, TOC) in aliphatic organic matter (OM) of low thermal maturity despite their ...
Paul C. Hackley +4 more
wiley +1 more source
Cambro-Proterozoic volcanism near Buckingham, Quebec
, 1981 Grenvillian gneiss and marble of the Buckingham area, Quebec were intruded by a syenite–monzonite–diorite suite, overlain by trachyandesite, and, finally, intruded by diabase.
Donald D. Hogarth, Jean Lafleur
core +1 more source
Frontiers in Earth Science, 2020 Archean-Proterozoic boundary represents a significant transitional phase in the Earth's history. Bastar Craton is one of the major Archean cratons in the Indian subcontinent with voluminous granites, supracrustal rocks, and tectonic belts.
Ajay Dev Asokan +4 more
doaj +1 more source
U–Pb Dating of Cambrian Magmatism in the Pinerolo‐Sanfront Unit, Dora‐Maira Massif (Western Alps)
Terra Nova, EarlyView.ABSTRACT The Pinerolo‐Sanfront Unit (PSU), the structurally lowest tectonic unit of the Dora‐Maira Massif (Western Alps), has been regarded as a monocyclic unit composed of Permo‐Carboniferous sediments and Permian granitoids that were metamorphosed during the Alpine orogeny.
Francesco De Cesari +6 more
wiley +1 more source
Eumetazoan fossils in terminal Proterozoic phosphorites? [PDF]
Proceedings of the National Academy of Sciences, 2000 Phosphatic sedimentary rocks preserve a record of early animal life different from and complementary to that provided by Ediacaran fossils in terminal Proterozoic sandstones and shales. Phosphorites of the Doushantuo Formation, South China, contain eggs, egg cases, and stereoblastulae that document animals of unspecified phylogenetic position ...
Xiao, Shuhai +2 more
openaire +4 more sources