The continental crust: its composition and evolution

Windley, Brian F.

doi:10.1016/0031-9201(86)90093-2

Cited by 21 publications

(12 citation statements)

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“…And the ratio of Nd/Th = 2.47-3.71 (mean = 3) is consistent with that of continental crust rocks (Nd/Th) mean = 3 (Wilson, 1989). However, the ratio of Nb/Ta = 8.14-24.10 (mean = 16.62) falls between the lower crust and mantle rocks, with lower crust rock Nb/Ta = 8.3 (Rudnick and Gao, 2003), and mantle rock Nb/Ta = 17.8 (Taylor and Mclennan, 1985). The ratio of Zr/Hf = 38.26-45.21 (mean = 41.48) is close to that of mantle rock (Zr/Hf = 37 (Taylor and Mclennan, 1985).…”

Section: Magma Evolutionsupporting

confidence: 67%

Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I‐type Granites in the North Qinling Orogenic Belt, Central China

Huang

Ai-fang

et al. 2023

Acta Geologica Sinica (Eng)

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The North Qinling Orogenic Belt (NQOB) is a composite orogenic belt in central China. It started evolving during the Meso‐Neoproterozoic period and underwent multiple stages of plate subduction and collision before entering intra‐continental orogeny in the Late Triassic. The Meso‐Cenozoic intra‐continental orogeny and tectonic evolution had different responses in various terranes of the belt, with the tectonic evolution of the middle part of the belt being particularly controversial. The granites distributed in the Dayu and Kuyu areas in the middle part of the NQOB can provide an important window for revealing the geodynamic mechanisms of the NQOB. The main lithology of Dayu and Kuyu granites is biotite monzogranite, and the zircon U–Pb dating yielded diagenetic ages of 151.3 ± 3.4 Ma and 147.7 ± 1.5 Ma, respectively. The dates suggest that the biotite monzogranite were formed at the end of the Late Jurassic. The whole‐rock geochemistry analysis shows that the granites in the study areas are characterised by slightly high SiO2 (64.50–68.88 wt%) and high Al2O3 (15.12–16.24 wt%) and Na2O (3.55–3.80 wt%) contents. They are also enriched in light rare earth elements, large ion lithophile elements (e.g. Ba, K, La, Pb, Sr), and depleted in high field strength elements (HFSEs) (e.g. Ta, Nb, P, Ti). Additionally, the granites demonstrated weakly negative‐slightly positive Eu anomalies (δEu = 0.91–1.19). Zircon Lu–Hf isotopic analysis showed ɛHf(t) = −6.1–−3.8, and the two‐stage model age is T2DM(crust) = 1.5–1.6 Ga. The granites in the study areas are analyzed as weak peraluminous high‐K calc‐alkaline I‐type granites. They formed by partial melting of the thickened ancient lower crust, accompanied by the addition of minor mantle‐derived materials. During magma ascent, they experienced fractional crystallisation, with residual garnet and amphibole for a certain proportion in the magma source region. Comprehensive the geotectonic data suggest that the end of the Late Jurassic granite magmatism in the Dayu and Kuyu areas represents a compression‐extension transition regime. It may have been a response to multiple tectonic mechanisms, such as the late Mesozoic intra‐continental southward subduction of the North China Craton and the remote effect of the Paleo‐Pacific Plate subduction.

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Section: Magma Evolutionsupporting

confidence: 67%

Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I‐type Granites in the North Qinling Orogenic Belt, Central China

Huang

Ai-fang

et al. 2023

Acta Geologica Sinica (Eng)

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“…The REE distribution patterns (normalized against PAAS 29 ) of the analyzed samples are shown in Fig. 3.…”

Section: Limits Of Detection and Methods Blanksmentioning

confidence: 99%

Separation of Rare Earth Elements In Geological Samples with High Concentrations of Barium Using RE Resin

Yang¹

2021

At.Spectrosc.

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Rare earth elements (REE) are important tools in geological studies.Accurate determination of REE concentrations can be affected in geological samples with low REE levels and/or high levels of interfering barium. Development of chemical separation methods allowing to isolate REE from other matrix components is a thorough approach to overcome this issue. In this study, a simple, RE resin-based separation method was developed and tested for a variety of sample solutions (mixed element solutions, shale, carbonate and granite). The method shows a good REE recovery and is efficient for the removal of matrix element, and notably Ba. The method is suitable for precise determination of the Eu contents in rock samples with high barium content.

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“…The difference in CO 2 consumption (Δ sil = 0.62 mol kg −1 ) between a relatively weak weathering stage (olive dashed line) and a strong one (blue dashed line) can thus be estimated by the upper and lower limits of the Na 2 O/Al 2 O 3 ratios in the eolian sequence (e.g., the Na 2 O/Al 2 O 3 ratios of 0.15 and 0.06 in the BS section and 0.13 and 0.04 for the CN section, respectively) (see Figure 10). (b) Test of the dependence of Δ sil on the parent rock composition using different upper crust compositions (S. Gao et al, 1998;Rudnick & Gao, 2003;S. R. Taylor & McLennan, 1985;Wedepohl, 1985).…”

Section: Ca Na Al Simentioning

confidence: 99%

“…Based on the reconstructed Na 2 O/Al 2 O 3 and Δ sil relationship (Figure 9a), the Na 2 O/Al 2 O 3 difference yields a Δ sil value of 0.62 mol C kg −1 (Figure 5). To test the dependence of the Δ sil value on the parent rock composition, we also employed three commonly used values for the upper crust (Rudnick & Gao, 2003;S. R. Taylor & McLennan, 1985;Wedepohl, 1995) to generate additional Na 2 O/Al 2 O 3 and Δ sil relationships (Figure 9b; Tables S3).…”

Section: Ca Na Al Simentioning

confidence: 99%

Monsoon‐Enhanced Silicate Weathering as a New Atmospheric CO₂ Consumption Mechanism Contributing to Fast Late Miocene Global Cooling

Yang

Galy

et al. 2021

Paleoceanog and Paleoclimatol

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The continental crust: its composition and evolution

Cited by 21 publications

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Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I‐type Granites in the North Qinling Orogenic Belt, Central China

Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I‐type Granites in the North Qinling Orogenic Belt, Central China

Separation of Rare Earth Elements In Geological Samples with High Concentrations of Barium Using RE Resin

Monsoon‐Enhanced Silicate Weathering as a New Atmospheric CO₂ Consumption Mechanism Contributing to Fast Late Miocene Global Cooling

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The continental crust: its composition and evolution

Cited by 21 publications

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Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I‐type Granites in the North Qinling Orogenic Belt, Central China

Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I‐type Granites in the North Qinling Orogenic Belt, Central China

Separation of Rare Earth Elements In Geological Samples with High Concentrations of Barium Using RE Resin

Monsoon‐Enhanced Silicate Weathering as a New Atmospheric CO2 Consumption Mechanism Contributing to Fast Late Miocene Global Cooling

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Monsoon‐Enhanced Silicate Weathering as a New Atmospheric CO₂ Consumption Mechanism Contributing to Fast Late Miocene Global Cooling