搜索结果: 1-12 共查到“地质学 grain”相关记录12条 . 查询时间(0.159 秒)
Geological factors responsible for REY-rich mud in the western North Pacific Ocean: Implications from mineralogy and grain size distributions
REY-rich mud biogenic calcium phosphate phillipsite pelagic sediment grain size distribution
2017/4/10
Seven piston cores were collected from the seafloor ~250 km south of Minamitorishima Island in the western North
Pacific Ocean during the cruise KR13-02 of R/V Kairei; in some portions of cores PC04 ...
Experimental study on coarse grain saltation dynamics in bedrock channels
Experimental study coarse grain saltation dynamics bedrock channels
2014/4/8
Saltation of bed load particles on bedrock surfaces is important for landscape evolution and bedrock incision in steep landscapes. However, few studies have investigated saltation in bedrock channels ...
Influence of bed patchiness, slope, grain hiding, and form drag on gravel mobilization in very steep streams
Influence of bed patchiness slope grain hiding form drag on gravel mobilization very steep streams
2014/4/8
Steep streams are a major portion of channel networks and provide a link to transport sediment from hillslopes to lower gradient rivers. Despite their importance, key unknowns remain, perhaps foremost...
Single-grain detrital muscovite Rb-Sr isotopic composition as an indicator of provenance for the Carboniferous sedimentary rocks in northern Dabie, China
Dabie detrital muscovite provenance single-grain Rb-Sr dating
2017/8/9
Low-grade metamorphic Paleozoic sedimentary rocks are exposed along the northern margin of the Qinling-Dabie orogenic belt that formed by the collision of the North and South China blocks during the E...
Grain size effect on Sr and Nd isotopic compositions in eolian dust: Implications for tracing dust provenance and Nd model age
eolian dust Sr and Nd isotope Nd model age grain size effect isotopic tracing
2017/8/9
Strontium (Sr) and neodymium (Nd) isotopic compositions enable identification of dust sources and reconstruction of atmospheric dispersal pathways. The Sr and Nd isotopic compositions in eolian dust c...
Geochemistry of Neogene sedimentary rocks from the Jiyang basin, North China Block: The roles of grain size and clay minerals
grain size clay minerals geochemistry chemical weathering Jiyang basin
2017/8/10
Major and trace element compositions of 83 fine-grained sedimentary rocks (including 14 fine-grained sandstones, 24 siltstones and 45 mudstones) from the Zhanhua Sag of Jiyang basin in the North China...
Single grain Rb-Sr isotopic analysis of GA-1550 biotite, LP-6 biotite and Bern-4M muscovite 40Ar-39Ar dating standards
Rb-Sr isotopic systematics standard mica GA-1550 biotite LP-6 biotite Bern-4M muscovite
2017/8/10
Three standard minerals GA-1550 biotite, LP-6 biotite and Bern-4M muscovite used for K-Ar and 40Ar-39Ar dating have been investigated by the single grain Rb-Sr technique. Compared to the K-Ar and 40Ar...
TEM investigation of Lewiston, Idaho, fibrolite: Microstructure and grain boundary energetics
grain boundary energetics Microstructure
2012/3/30
High-resolutiontransmissionelectronmicroscopy(HRTEM)revealedthatasampleof
?ne-grainedLewiston,Idaho,?broliteispredominantly?brolitewithtraceamountsof
poorlycrystallinelayersilicates.The?broliteconsi...
Computer simulation of pressure-induced structural transitions in MgO [001] tilt grain boundaries
pressure-induced tilt grain boundaries
2012/3/30
Atomisticsimulationsusinglatticeandmoleculardynamicswerecarriedoutonthe
{210},{310},and{410}tiltgrainboundariesofMgOasafunctionofpressureupto100
GPaatasingletemperatureof600K.Thecalculationsshowasig...
Structure and formation mechanism of low-angle grain boundaries in chlorite
Structure formation mechanism low-angle grain boundaries
2012/3/31
The structure and formation mechanisms of low-angle grain boundaries (LAGB) in chlorite have been investigated using HRTEM to resolve each cation sheet in chlorite. The LAGB are abundant in two hydrot...
The origin and diagenesis of grain-coating serpentine-chlorite in Tuscaloosa Formation sandstone, U.S. Gulf Coast
origin diagenesis grain-coating serpentine-chlorite Tuscaloosa Formation sandstone
2012/4/5
Randomly interstratified serpentine-chlorite (Sp-Ch) is ubiquitous in sandstones ofthe subsurface Tuscaloosa Formation. TheSp-Choccursasgraincoatings, porefillings, pel-oids,andinfillings.Thepresenceo...
Electron microprobe analysis of Ca in olivines close to grain boundaries: The problem of secondary X-ray fluorescence
Electron microprobe analysis of Ca olivines grain boundaries secondary X-ray fluorescence
2012/4/5
AnalysisofCain olivine grainscloseto boundaries withCa-richphases is inherently problematic becauseofthe effectsofsecondary X-rayfluorescenceofCafrom the adjoining Ca-richphase. Commercial fluorescenc...