Petrography and geochemical characteristics of Chang 7 sandstone in Yanhe profile, Ordos Basin: Implication for paleoenvironment and tectonic background

2020 ◽  
Vol 8 (4) ◽  
pp. T981-T990
Author(s):  
Haijun Gao ◽  
Delu Li ◽  
Dingming Dong ◽  
Hongjun Jing ◽  
Hao Tang
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Ordos Basin ◽  
Island Arc ◽  
Geochemical Characteristics ◽  
Hydrocarbon Exploration ◽  
Source Rocks ◽  
Grain Size Analysis ◽  
Alkaline Basalt

The Chang 7 oil layer from the upper Triassic Yanchang Formation is an important layer for hydrocarbon exploration. Most studies on the Chang 7 oil layer have focused on the source rocks, while research on the sandstone is still inadequate, especially on the petrography and geochemical characteristics. Using seven sandstone samples of the Chang 7 oil layer in the Yanhe profile, the grain-size analysis, major elements, trace elements, and rare earth elements were tested. The results find that the sandstone of fine-grained sediments of the Chang 7 oil layer is dominated by arkose with a minor number of lithic arkose. The range of grain size (Mz) is from 2.72 to 3.92 Φ, and the C value and M value of the sandstone samples suggest characteristics of turbidity deposition. The Al/Si ratios of all of the samples imply high clay mineral content. The results of trace and rare earth elements demonstrate the reducing condition, freshwater, and cold and dry weather. The provenance of the sandstone samples is mainly from island arc acidic volcanic rock, and the type of provenance is mixed with sedimentary rock, granite, and alkaline basalt. The tectonic background is continental island arc. This study provides a systematic geologic foundation for the formation of sandstone of Chang 7 oil layer in Ordos Basin.

scholarly journals Fractionation Trends and Variability of Rare Earth Elements and Selected Critical Metals in Pelagic Sediment from Abyssal Basin of NE Pacific (Clarion-Clipperton Fracture Zone)

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 320 ◽  
Author(s):  
Dominik Zawadzki ◽  
Łukasz Maciąg ◽  
Tomasz Abramowski ◽  
Kevin McCartney
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Fracture Zone ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Critical Metals ◽  
Icp Ms ◽  
Clipperton Fracture Zone ◽  
Clarion Clipperton Fracture Zone

The geochemical and mineralogical characteristics of pelagic sediments collected from the Interoceanmetal Joint Organization (IOM) claim area, located in the eastern part of the Clarion-Clipperton Fracture Zone (CCFZ; eastern tropical Pacific), are described in this paper. The concentrations of rare earth elements (REE), as well as other selected critical elements contained in 135 sediment samples of siliceous clayey silts, are presented. The vertical and spatial variabilities of elements, with particular emphasis on REE as well as metals of the highest economic interest such as Cu, Ni, and Co, are detailed. The applied methods include grain size analysis by laser diffraction, geochemistry examination using ICP-MS, XRF, AAS, and CNS spectrometry, and XRD analysis of mineral composition (Rietveld method). Additionally, statistical methods such as factor analysis (FA) and principal components analysis (PCA) were applied to the results. Finally, a series of maps was prepared by geostatistical methods (universal kriging). Grain size analysis showed poor sorting of the examined fine-grained silts. ICP-MS indicated that total REE contents varied from 200 to 577 ppm, with a mean of 285 ppm, which is generally low. The contents of critical metals such as Cu, Ni, and Co were also low to moderate, apart from some individual sampling stations where total contents were 0.15% or more. Metal composition in sediments was dominated by Cu, Ni, and Zn. A mineral composition analysis revealed the dominance of amorphous biogenic opaline silica (27–58%), which were mostly remnants of diatoms, radiolarians, and sponges associated with clay minerals (23% to 48%), mostly Fe-smectite and illite, with mixed-layered illite/smectite. The high abundance of diagenetic barite crystals found in SEM−EDX observations explains the high content of Ba (up to 2.4%). The sediments showed complex lateral and horizontal fractionation trends for REE and critical metals, caused mostly by clay components, early diagenetic processes, admixtures of allogenic detrital minerals, or scavenging by micronodules.

Rare Earth Elements in No. 2 Coal of Huangling Mine, Huanglong Coalfield, China

2012 ◽  
Vol 30 (5) ◽  
pp. 803-818 ◽  
Author(s):  
Cunliang Zhao ◽  
Dujuan Duan ◽  
Yanheng Li ◽  
Jianya Zhang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Depositional Environment ◽  
Ordos Basin ◽  
Average Concentration ◽  
Source Rocks ◽  
Tectonic Activity ◽  
Geochemical Anomaly ◽  
Metallogenic Belt ◽  
Reported Data

Rare earth elements (REEs) can provide lots of information relevant to the evolution of source rocks, depositional environment, and epigenetic tectonic activity. In this study, 14 bench samples (including 11 coals, 1parting, 1roof and 1floor) of the No. 2 coal seam from Huangling Mine, Huanglong Coalfield, Ordos Basin, China were collected to study the REE geochemistry. The average concentration of REEs is 44.03 μg/g, and it is lower than those in coals of the Chinese and world coal. The coals are enriched in light REEs and the LREEs-HREEs have been highly fractionated, with an average (La/Yb) N of 11.38. The values of Ce/Ce* are more or less than 1 (with an average 0.92) and indicates that the anomaly of Ce is very slight. However, the values of Eu/Eu* (with an average 7.69 of coal) are distinctly higher than reported data of coals. The extremely high contents of Ba caused the geochemical anomaly of REEs. The Ba2+ was origin from the barium metallogenic belt in Qinling Old-upland.

Geochemical characteristics of rare earth elements in the surface sediments from the Spratly Islands of China

2017 ◽  
Vol 114 (2) ◽  
pp. 1103-1109 ◽  
Author(s):  
Jingxi Li ◽  
Chengjun Sun ◽  
Li Zheng ◽  
Xiaofei Yin ◽  
Junhui Chen ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Surface Sediments ◽  
Geochemical Characteristics ◽  
Spratly Islands

scholarly journals Geochemistry of Surface Sediments From the Emperor Seamount Chain, North Pacific

2021 ◽  
Vol 9 ◽  
Author(s):  
Jie Chen ◽  
Jianjun Zou ◽  
Aimei Zhu ◽  
Xuefa Shi ◽  
Dirk Nürnberg ◽  
...  
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Water Depth ◽  
Surface Sediment ◽  
North Pacific ◽  
The North ◽  
Seamount Chain ◽  
The North Pacific ◽  
Emperor Seamount Chain

Investigating the composition and distribution of pelagic marine sediments is fundamental in the field of marine sedimentology. The spatial distributions of surface sediment are unclear due to limited investigation along the Emperor Seamount Chain of the North Pacific. In this study, a suite of sedimentological and geochemical proxies were analyzed, including the sediment grain size, organic carbon, CaCO3, major and rare earth elements of 50 surface sediment samples from the Emperor Seamount Chain, spanning from ∼33°N to ∼52°N. On the basis of sedimentary components, we divide them into three Zones (I, II, and III) spatially with distinct features. Sediments in Zone I (∼33°N–44°N) and Zone III (49.8°N–53°N) are dominated by clayey silt, and mainly consist of sand and silty sand in Zone II. The mean grain size of the sortable silt shows that the hydrodynamic condition in the study area is significantly stronger than that of the abyssal plain, especially at the water depth of 1,000–2,500 m. The CaCO3 contents in sediments above 4,000 m range from 20 to 84% but decrease sharply to less than 1.5% below 4,000 m, confirming that the water depth of 4,000 m is the carbonate compensation depth of the study area. Strong positive correlations between Al2O3 and Fe2O3, TiO2, MgO, and K2O (R > 0.9) in the bulk sediments indicate pronounced contributions of terrigenous materials from surrounding continent mass to the study area. Furthermore, the eolian dust makes contributions to the composition of bulk sediments as confirmed by rare earth elements. There is no significant correlation between grain size and major and minor elements, which indicates that the sedimentary grain size does not exert important effects on terrigenous components. There is significant negative δCe and positive δEu anomalies at all stations. The negative Ce anomaly mainly exists in carbonate-rich sediments, inheriting the signal of seawater. The positive Eu anomaly indicates widespread volcanism contributions to the study area from active volcanic islands arcs around the North Pacific. The relative contributions of terrestrial, volcanic, and biogenic materials vary with latitude and water depth in the study area.

Rare earth elements in different size fractions of a marine quick clay from Ullensaker, and a till from Upper Numedal, Norway

Clay Minerals ◽  
1979 ◽  
Vol 14 (3) ◽  
pp. 229-240 ◽  
Author(s):  
Elen Roaldset
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Mineralogical Composition ◽  
Marine Clay ◽  
Size Fractions ◽  
Quick Clay

AbstractThe distribution of rare earth elements (REE) in two different sediments, a marine clay and a till, was found to be dependent both on grain size and mineralogical composition. In the marine clay the REE content was highest in the coarsest fraction; in the till REE were markedly enriched in the finest fraction. Detrital and authigenic origins for different size fractions have been attributed on the basis of REE contents.

Petrogenesis and regional tectonic significance of Late Devonian mafic intrusions in the Meguma Zone, Nova Scotia

1995 ◽  
Vol 32 (11) ◽  
pp. 1883-1898 ◽  
Author(s):  
Marcus C. Tate ◽  
D. Barrie Clarke
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Island Arc ◽  
Late Devonian ◽  
Calc Alkaline ◽  
Mafic Intrusions ◽  
Heavy Rare Earth Elements ◽  
Regional Tectonic ◽  
Spider Diagrams ◽  
Ocean Lithosphere

Late Devonian (377–368 Ma, 40Ar/39Ar; 376 Ma, U–Pb) mafic intrusions in the Meguma Zone crop out as dykes, plugs, and synplutonic bodies of gabbro, diorite, or lamprophyre. All of the intrusions have similar lithologie characteristics and hydrous ferromagnesian mineral assemblages, and they appear to represent a genetically related series of mafic bodies with similar petrogenetic histories in the crust of the Meguma Zone. The intrusions show wide chemical variation of SiO2 (45.7–65.7 wt.%), Al2O3 (8.9–26.5 wt.%), MgO (2.8–26.5 wt.%), CaO (1.2–11.2 wt.%), and K2O (0.1–4.4 wt.%), and they have calc-alkaline, high-K calc-alkaline, and shoshonitic characteristics. Large-ion lithophile elements (LILE) are present at variable but high concentrations (e.g., Ba = 62–1920 ppm, Sr = 176–2567 ppm) relative to most high field strength element (HFSE) abundances (e.g., Y = 10–37 ppm, Zr = 8–421 ppm), and light rare-earth elements (LREE) have much higher concentrations than heavy rare-earth elements (HREE) (La/Lu = 24–330). Initial Sr isotopic ratios (0.7044–0.7079) and εNd values (−4.36 to 3.69) are highly variable. Scatter on major oxide variation diagrams probably results from the fractionation of all the major modal phases in the intrusions (olivine, augite, hornblende, and (or) plagioclase), and the cumulate characteristics of some bodies support this suggestion. Nevertheless, parallel patterns for the intrusions on mid-ocean ridge basalt (MORB) normalized spider diagrams support the notion of similar mafic parent melts, and Sr–Nd isotopic data identify contamination by continental crust in only one of the intrusions. The most primitive picrite contains approximately basaltic HFSE in conjunction with HREE at 5–11CN, perhaps suggesting that the magmas emanated from depleted peridotite or pyroxenite, but high alkalies, LILE (<60MN), and LREE (10–100CN), and elevated initial Sr ratios in all of the intrusions, also require the existence of an enriched source component. Troughs in the spider diagrams at Ta, Nb, and Ti, and Sr–Nd isotopic values comparable with modern island-arc basalts, suggest that fluids derived from subducted ocean lithosphère metasomatized the mantle. Tectono-magmatic discriminators imply a continental margin arc environment rather than an island arc, and the intrusions record either Early Devonian subduction of Iapetus Ocean lithosphère beneath the Avalon terrane, Middle Devonian subduction of Theic Ocean lithosphère beneath the Meguma terrane, or an inherited subduction signature formed during a much older event.

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