Results 31 to 40 of about 45,988 (266)

A UNIQUE FINDING OF ZIRCON INTO BADDELEYITE TRANSFORMATION (THE ICHETJU ORE OCCURRENCE, THE MIDDLE TIMAN)

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2018
Findings of the growth relationships between baddeleyite and zircon are rare, due to significant differences in the formation conditions of the minerals.
S. G. Skublov   +4 more
doaj   +1 more source

Patterns of Late Cenozoic exhumation deduced from apatite and zircon U-He ages from Fiordland, New Zealand [PDF]

open access: yes, 2005
New apatite and zircon (U-Th)/He ages from the Fiordland region of New Zealand's South Island expand on earlier results and provide new constraints on patterns of Late Cenozoic exhumation and cooling across this region.
House, Martha A.   +7 more
core   +1 more source

Impact of Health System Structures on Caries Prevalence Among Schoolchildren in Germany and Saudi Arabia

open access: yesChildren
Background and Objectives: Dental caries remains one of the most prevalent chronic conditions among children worldwide, with considerable variation in burden shaped by differences in health-system organization and preventive program implementation.
Yasser Mansour Aljafen   +2 more
doaj   +1 more source

Experimental evidence for the preservation of U-Pb isotope ratios in mantle-recycled crustal zircon grains

open access: yesScientific Reports, 2018
Zircon of crustal origin found in mantle-derived rocks is of great interest because of the information it may provide about crust recycling and mantle dynamics.
Fernando Bea   +2 more
doaj   +1 more source

In-situ zircon U-Pb dating method by LA-ICP-MS and discussions on the effect of different beam spot diameters on the dating results

open access: yesDizhi lixue xuebao, 2022
By using the newly introduced GeoLas HD 193 nm ArF excimer laser ablation system and the Agilent 7900 quadrupole inductively coupled plasma mass spectrometer (ICP-MS) in the Key Laboratory of Paleomagnetism and Tectonic Reconstruction at the Institute of
WANG Sen   +8 more
doaj   +1 more source

Possible Jurassic age for part of Rakaia Terrane: implications for tectonic development of the Torlesse accretionary prism [PDF]

open access: yes, 2001
Greywacke sandstone and argillite beds comprising Rakaia Terrane (Torlesse Complex) in mid Canterbury, South Island, New Zealand, are widely regarded as Late Triassic (Norian) in age based on the occurrence of Torlessia trace fossils, Monotis, and other ...
Kamp, Peter J.J., Peter J. J. Kamp
core   +1 more source

K-feldspar sand-grain provenance in the Triassic, west of Shetland : distinguishing first-cycle and recycled sediment sources? [PDF]

open access: yes, 2009
Sandstone provenance studies can help constrain palaeogeographic reconstructions and ancient drainage system scales and pathways. However, these insights can be obscured by difficulties in geochemically distinguishing or adequately characterising ...
Daly, J. Stephen   +9 more
core   +1 more source

The Medicine Hat Block and the Early Paleoproterozoic Assembly of Western Laurentia

open access: yesGeosciences, 2020
The accretion of the Wyoming, Hearne, and Superior Provinces to form the Archean core of western Laurentia occurred rapidly in the Paleoproterozoic. Missing from Hoffman’s (1988) original rapid aggregation model was the Medicine Hat block (MHB).
Jennifer N. Gifford   +2 more
doaj   +1 more source

Intermontane basins and bimodal volcanism at the onset of the Sveconorwegian Orogeny, southern Norway [PDF]

open access: yes, 2014
This research was supported by the University of St Andrews and the Natural Environment Research Council Steering Committee (IMF458/0512 and IP-1326-0512).The greenschist-facies late Mesoproterozoic Bandak succession in southern Norway consists of ...
Roberts, Nick M.W.   +13 more
core   +1 more source

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