搜索结果: 1-11 共查到“地质学 track”相关记录11条 . 查询时间(0.078 秒)
Scientists track the brain-skull transition from dinosaurs to birds（图）
Scientists brain-skull transition dinosaurs birds
2017/9/20
The dramatic, dinosaur-to-bird transition that occurred in reptiles millions of years ago was accompanied by profound changes in the skull roof of those animals — and holds important clues about the w...
Topography of Teeth:Smithsonian Scientist Strengthens Tools To Track Animal,Ecosystem Responses to Major Environmental Changes
Topography of Teeth Smithsonian Scientist Strengthens Tools Track Animal Ecosystem Responses Environmental Changes
2016/11/29
By charting the slopes and crags on animals’ teeth as if they were mountain ranges, scientists at the Smithsonian’s National Museum of Natural History have created a powerful new way to lear...
207Pb-206Pb, 40Ar-39Ar and Apatite Fission-Track Geothermochronology Revealing the Emplacement, Cooling and Exhumation History of the Karaçayır Syenite (N Sivas), East-Central Anatolia, Turkey
single zircon 207Pb-206Pb biotite 40Ar-39Ar apatite fission-track exhumation history Karaç ayı r syenite Sivas Turkey
2009/7/7
The Karaçayır syenite, intruding the Palaeozoic crustal metamorphics and unconformably overlain by Upper Paleocene to Eocene Tokuş formation in the north of Sivas (east-central Anatol...
207Pb-206Pb, 40Ar-39Ar and Fission-Track Geothermochronology Quantifying Cooling and Exhumation History of the Kaman-Kırşehir Region Intrusions, Central Anatolia, Turkey
single zircon 207Pb-206Pb amphibole 40Ar-39Ar apatite fission-track cooling exhumation Kaman-Kı rş ehir region central Anatolia Turkey
2009/7/7
The Kaman-Kırşehir region intrusions were generated in a post-collisional extensional setting following Cenomanian-Turonian docking of an oceanic island arc, comprising the supra-subduction ...
EXPERIMENTAL EVIDENCE CONCERNING THE PRESSURE DEPENDENCE OF HE DIFFUSION AND FISSION-TRACK ANNEALING KINETICS IN APATITE
EXPERIMENTAL EVIDENCE CONCERNING FISSION-TRACK ANNEALING KINETICS IN APATITE
2014/4/8
that other techniques will emerge which may
bypass the need for such irradiation. Two side
benefits of such a development would be the
avoidance of a need for FTD laboratories to
hand...
Variability of apatite fission-track annealing kinetics: II. Crystallographic orientation effects
apatite fission-track annealing Crystallographic orientation effects method
2012/3/31
A method is presented that permits the length of any horizontal, confined fission-track inclined at a
specified angle to the crystallographic c axis in apatite to be converted to an equivalent track ...
Variability of apatite fission-track annealing kinetics: III. Extrapolation to geological time scales
apatite fission-track annealing kinetics Extrapolation geological time scales
2012/3/31
A new model for examining fission-track data from natural specimens has been developed on the
basis of new laboratory data describing fission-track annealing in a wide variety of apatites and the
em...
Variability of apatite fission-track annealing kinetics: I. Experimental results
apatite fission-track annealing kinetics I. Experimental results initial lengths
2012/3/31
Annealing rates for fission tracks in apatite vary markedly as a complex function of composition,
based on an experimental study of 15 well-characterized, compositionally diverse apatites. Extensive
...
Observations on the geometry of etched fission tracks in apatite: Implications for models of track revelation
Observations geometry of etched fission tracks apatite Implications track revelation
2012/4/9
TEispaperreports observations ofetched internal {OOO1}, {lOTO},{1120}, {loT1},and {1121} surfaces of Durango apatite. Three types of surfaces are distinguished: Ptype, S type, and T type. After initia...
B and Li distribution in the Pe馻 Negra complex: An alpha track study
B Li distribution Pe馻 Negra complex alpha track study
2012/4/5
Alpha-trackimaging (ATI) provides amapofthe surface distribution ofB +Liacross apolished thin section and canreveal textural detailthat is otherwisenotaccessible.It is alsousefulfor studying mineralss...
Surface Charge Density Determination of Micaceous Minerals by 235U Fission Particle Track Method
Micaceous Minerals 235U Fission surface charge density mica
2012/2/13
The surface charge density of mica (001) cleavages was determined by counting the number of fission particle tracks in a given area of a 6-mm muscovite disc replica with optical and scanning electron ...