搜索结果: 31-45 共查到“理学 Geochemistry”相关记录99条 . 查询时间(0.033 秒)
Geochemistry of Muro Banded Iron-Formation, Central Nigeria
Muro Iron-Formation Oxide Facies Carbonate Facies
2013/3/11
Muro Banded Iron-Formation occurs in the Proterozoic Toto Schist Belt, central Nigeria. It consists preponderantly of oxide facies and minor carbonate facies. The oxide facies is made up of alternatin...
Geochemistry and Geochronology of Peraluminous High-K Granitic Leucosomes of Yaoundé Series (Cameroon): Evidence for a Unique Pan-African Magmatism and Melting Event in North Equatorial Fold Belt
Pan-African North-Equatorial Fold Belt Yaoundé Series
2013/3/8
Geochemical and geochronological studies have been carry out on the leucosomes of Yaoundé series with the aims to identify the magma sources and to indicate their production periods and emplacement wi...
Sm–Nd geochronology, REE geochemistry and C and O isotope characteristics of calcites and stibnites from the Banian antimony deposit, Guizhou Province, China
Banian antimony deposit calcite stibnite Sm–Nd geochronology REE
2017/4/11
The Banian sediment-hosted antimony deposit is a medium-sized deposit located in the Dushan County, South Guizhou,
China. Calcite is the dominant gangue mineral and can be divided into two types: whi...
Geochemistry of Water and Suspended Particulate in the Lower Yangtze River: Implications for Geographic and Anthropogenic Effects
Suspended Particulate Major Element Trace Element
2013/3/7
The lower Yangtze River undergoes intense anthropogenic activities and various natural progress compared to the upper-middle reaches. We explore the aqueous geochemistry of ions and elements of suspen...
Petrography and geochemistry of accreted oceanic fragments below the Western Cordillera of Ecuador
Ecuador Western Cordillera accreted oceanic terranes exhumation
2017/4/12
The Western Cordillera of Ecuador consists of Cretaceous crustal fragments of oceanic plateaux and superimposed
insular arcs, which were accreted to the northwestern South American margin during the ...
Diamond prospectivity of Mesoproterozoic lamproites from the Krishna valley, eastern Dharwar craton, southern India: Insights from whole-rock geochemistry
diamond lamproite Krishna valley Dharwar craton
2017/4/12
Diamond prospectivity of Mesoproterozoic lamproites in the Krishna valley at the northern and north-eastern margin
of the Cuddapah Basin, southern India, is a matter of significance since several his...
Determining the Relative Age of Fault Activity through Analyses of Gouge Mineralogy and Geochemistry: A Case Study from Vápenná (Rychleby Mts), Czech Republic
Crystalline Limestone Intersecting Faults Fault Gouge Relative Chronology
2013/3/6
The relative age of fractures can be determined through structural analyses in the field or through the detailed mineralogical (XRD) and chemical analyses (AAS method, volumetric, and gravimetric anal...
Geochemistry and mineralogy of Paleocene-Eocene Oum El Khecheb phosphorites (Gafsa-Metlaoui Basin) Tunisia
phosphorites carbonate-fluorapatite REE trace elements Tunisia
2017/8/9
Upper Paleocene to Lower Eocene phosphates of the Jebel Oum El Khecheb profile (Gafsa-Metlaoui Basin GMB, Tunisia) are mostly composed of brown phospharenites lithified or not, granular, with pellets,...
Evaporite mineralogy and major element geochemistry as tools for palaeoclimatic investigations in arid regions: A synthesis
Tropical deserts evaporite minerals geochemistry synthesis
2011/11/11
This paper presents a synthesis of the applications of evaporite mineralogy and the relationship between major elements for the
palaeoclimatological research of arid regions, with examples from Playa...
Episodes of low dissolved oxygen indicated by ostracodes and sediment geochemistry at Crystal Lake, Illinois, USA
low dissolved oxygen stracodes sediment geochemistry
2014/4/17
Low dissolved oxygen during the summer and early fall controls profundal continental ostracode distribution
in Crystal Lake (McHenry County), Illinois, favoring Cypria ophthalmica and Physocypria glo...
Petrography and Geochemistry of the Jajarm Bauxite ore Deposit, Northeast Iran: Implications for Source Rock Material and Ore Genesis
Iran karst bauxite geochemistry diaspore ore deposit
2010/10/14
The Jajarm bauxite deposit, northeast Iran, is the largest such deposit in Iran. The deposit is sandwiched between the Triassic Elika formation and the Jurassic Shemshak formation, housed within karst...
Mineral and Whole-rock Geochemistry of the Kestanbol Granitoid (Ezine-Çanakkale) and its Mafic Microgranular Enclaves in Northwestern Anatolia: Evidence of Felsic and Mafic Magma Interaction
Kestanbol granitoid magma mingling/mixing mafic microgranular enclave (MME) hybrid magma post-collision
2010/10/14
The Miocene Kestanbol granitoid, in Ezine-Çanakkale, Turkey, is one of post-collision granitoids of western Anatolia, which have been related to the the late Cretaceous collision between the An...
Thermal anomalies and fluid geochemistry framework in occurrence of the 2000-2001 Nizza Monferrate seismic sequence (northern Italy):Episodic changes in the fault zone heat flow or chemical mixing phenomena?
Thermal anomalies fluid geochemistry framework Episodic changes fault zone heat flow
2009/12/11
The paper discusses the correlation between the heating of shallow groundwater over a 10 × 20 km wide area close to the town of Nizza Monferrato (Piemonte Region, Northern Italy) and the concomitant l...
Geochemistry of trondhjemites and mafic rocks in the Bymarka ophiolite fragment,Trondheim,Norway:Petrogenesis and tectonic implications
Geochemistry of trondhjemites mafic rocks Bymarka ophiolite fragment tectonic implications
2009/12/3
The Early Ordovician Bymarka ophiolite fragment is situated in the Upper Allochthon of the central Norwegian Caledonides. Geochemical and geochronological investigations of this and other ophiolite fr...
Mixtures of multiplicative cascade models in geochemistry
Mixtures multiplicative cascade models geochemistry
2009/11/3
Multifractal modeling of geochemical map data can help to explain the nature of frequency distributions of element concentration values for small rock samples and their spatial covariance structure. U...