Calcium-Alkaline And Alkaline Basalt Tectonic Genesis
Basalt types: tholeiites vs alkali basalts
Deeper melting (25% melting at 60 km = alkaline basalt) Lesser % partial melting (20% melting at 60 km = alkaline basalt) Groundmass: Fine-grained. No olivine. Quartz, interstitial glass common. Clinopyroxene (augite, pigeonite) Ca-poor orthopyroxene (hypersthene) No alkali feldspar: Coarse. Olivine common. No quartz; interstitial glass rare
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Petrogenesis and tectonic implication of the alkaline …
Zircon holds crucial information for deciphering the origin of granitic rocks, enabling robust scrutiny of their magmatic evolution. Herein, we report an integrated whole‐rock and zircon U–Pb and Lu–Hf isotope chemistry of Ropp alkaline granites in north‐central Nigeria. The rock units include riebeckite‐biotite granite porphyries (161.1 ± 1.7 Ma), aegirine‐biotite …
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(PDF) Alkaline Rocks and Geodynamics
When applied to basalt sills in hot crust, the theory predicts that basalt sills of thicknesses from 10 to 1500 m require only 1 to 270 y to solidify and would form voluminous overlying layers of ...
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(PDF) Petrogenesis of alkaline basalt‑hosted sapphire …
Petrogenesis of alkaline basalt‑hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany
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Petrogenesis of alkaline basalt-hosted sapphire …
genesis of alkaline basalt-hosted sapphires was intensively ... tectonic block within the Rhenohercynian Zone and has been uplifted since Eocene times (e.g., Illies et al. 1979;
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Generation of tholeiitic and calc-alkaline arc magmas and its
Arc magmatism in subduction zones is widely thought to play a critical role in the formation and growth of the continental crust (Taylor and White, 1965, Taylor, 1977, Weaver and Tarney, 1982, Rudnick, 1995).Yet, there is large compositional diversity in arc magmas, presenting a major challenge for understanding of the nature of arc magmas and the origin of …
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Basalt: Composition, Properties, Types, Uses – Geology In
Alkalis (Na₂O + K₂O): 2-5% - Relatively low compared to other rock types, reflecting the abundance of magnesium and calcium in basalt. Iron oxides (FeO and Fe₂O₃): 5-14% - These oxides contribute to the dark color and give basalt its high density. Calcium oxide (CaO): ~10% - A key component of plagioclase feldspar, a dominant mineral in ...
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(PDF) Sub-lithospheric origin of Na-alkaline and …
The coeval occurrence of calc-alkaline and Na-alkaline volcanism observed here is in striking contrast with activity in the surrounding Western and Eastern Anatolia regions, where the calc ...
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Basalt geochemistry as a diagnostic indicator of tectonic setting
The Andean continental arc basaltic lavas comprise basalt and basaltic andesite, that display high FeOT/MgO for a given SiO 2 (three samples display low FeOT/MgO for a given SiO 2), but also alkaline basalt and basaltic trachyandesite that belong to the alkaline series (shoshonitic series) (Fig. 9 a and b).
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Formation and Evolution of Magmas | SpringerLink
A critical distinction between the two subalkaline series is provided by the different behaviour of the Fe/Mg ratio during the early stages of the magmatic evolution, as shown by different trends in the ternary AFM plot (Fig. 17.3).In the calc-alkaline series, the Fe/Mg ratio continuously decreases from basalt to rhyolite, due to the settling of early formed Fe–Ti oxides.
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The Origin of Basalt
1 Basalt Types and Plate Tectonics. Basalt of mid-ocean ridges (mid-ocean ridge basalts, MORB) form along divergent plate margins (oceanic rifts), where the volcanic …
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(PDF) A genetic classification of the tholeiitic and calc-alkaline
This tectonic episode promoted the Carboniferous (Mississippian and Pennsylvanian) tholeiitic to calc-alkaline magmatism, represented in the Colombian Andes through the tonalite and diorite-gabbro ...
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Continuous plate subduction marked by the rise of alkali
Li, X.-H. et al. Petrogenesis and tectonic significance of the ∼ 850 Ma Gangbian alkaline complex in South China: evidence from in situ zircon U–Pb dating, Hf–O isotopes and …
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Evaporitic carbonates in the pre-salt of Santos Basin – Genesis …
The high salinity paleolake would become saturated in calcium bicarbonate/carbonate as internally drained NaHCO 3-bearing alkaline waters, formed by physical/chemical weathering of penecontemporaneous basaltic rocks, mix with the CaCl 2-bearing hot brines percolating through the barrier, producing a hybrid brine (2NaHCO 3 + CaCl …
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Magnesium and Calcium Isotopic Geochemistry …
Phlogopite 40 Ar/ 39 Ar ages and perovskite U–Pb ages of the alkaline basalts suggest that the alkaline basalt–carbonatite complexes were erupted at 23–16 Ma (Liu et al., 2018; Yu et al., 2006). The alkaline basalts …
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Petrogenesis and tectonic significance of the Late …
Numerous calc-alkaline granitoid intrusions in the eastern Kunlun Orogen provide a valuable opportunity to constrain the evolution of the orogen. The age and genesis of these intrusions, however, remain poorly understood. The granitoid intrusions near the Balong region, eastern Kunlun Orogen, consist of granodiorite, diorite and syenogranite.
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Geochemical Discrimination and Characteristics of Magmatic Tectonic
1 Introduction. The geochemical discrimination of the tectonic setting of magmatic events is one of the most important and useful applications of whole-rock geochemistry (e.g., Pearce & Cann, 1973).This approach allows the discrimination of the tectonic setting of a given suite of volcanic rocks using whole-rock geochemical data, including major and trace element …
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On the development of the calc-alkaline and tholeiitic …
Whereas tholeiitic magmas may occur in all tectonic settings, calc-alkaline magmas appear to be uniquely associated with the convergent margin setting (Miyashiro, 1974, Zimmer et al., 2010). Convergent margin (arc) magmatism is thought to be a key process by …
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The Role of Water in Generating the Calc-alkaline Trend: …
We illustrate the utility of the THI by examining its variation in several magmatic suites from different tectonic settings, including 41 magmatic suites from arcs, back-arc …
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Magnesian andesite and basalt from Shodo-Shima Island, southwest Japan
The zircon U-Pb dating results reveal that the arc tholeiitic to calc-alkaline basalt-andesite-dacite-rhyolite assemblages erupted at ∼ 2.57 Ga – ∼2.52 Ga and back-arc basin basalt lithological association at ∼ 2.55–2.52 Ga.
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Genesis and tectonic setting of Middle Permian OIB-type …
Request PDF | Genesis and tectonic setting of Middle Permian OIB-type mafic rocks in the Sumdo area, southern Lhasa terrane | This paper reports newly discovered mafic rocks, including cumulate ...
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Paleoproterozoic calc-alkaline lamprophyres from the …
Calc-alkaline lamprophyres are widely regarded as important probes for unravelling continental-scale geodynamic processes. We present petrographic, mineral chemical, bulk-rock geochemical, and Sr ...
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(PDF) Magnesium and Calcium Isotopic Geochemistry of …
fore, carbonatite, carbonated silicate and alkaline basalt magmas can provide important information on C recy- cling (Amsellem et al., 2020 ; Banerjee et al., 2021 ; Simon, 2022 ).
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(PDF) A genetic classification of the tholeiitic and …
The concept of the magma series'and the distinction between alkaline, calc-alkaline. and tholeiitic trends has been a cornerstone in igneous petrology since the early 20 th. century, and encodes ...
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Genesis of the calc-alkaline igneous rock suite
Subsequently this pile of basalt may, under dry conditions, transform to quartz eclogite, sink into the mantle and finally undergo partial melting at 100–150 kms depth. ... Genesis of the calc-alkaline igneous rock suite @article{Green1968GenesisOT, title={Genesis of the calc-alkaline igneous rock suite}, author={Trevor H. Green and Trevor H ...
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Geochemical and thermodynamic constraints on the genesis …
Crustal contamination is negligible for both alkaline and tholeiitic basalts according to the following reasons: (1) Mantle xenoliths are observed in the alkaline basalts (Wang et al., 2016), indicating rapid eruption of the magma and short residence time in the crust; (2) The alkaline and tholeiitic basalts all have positive Nb Ta anomalies ...
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REE mineralization related to carbonatites and alkaline …
Permian magmatism occurred widely in the Tarim basin and adjacent areas of NW China, resulting in the emplacement of numerous carbonatite plutons and alkaline rock intrusions, which are likely to have been derived from mantle sources. In addition, at least one large igneous province (LIP) can be recognized in NW China; namely, the ca. 270–290 Ma …
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Genesis of the Madang Cenozoic sodic alkaline basalt in the …
The Madang Cenozoic sodic alkaline basalt occurred in the eastern margin of the Tibetan Plateau, where is a key tectonic transform region of Tibet, North China, and Yangtze blocks. ... The Madang basalts occurred in the specific tectonic background, they result from partial melting of a mixed asthenospheric mantle reservoir in the western ...
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The genesis of the calc-alkaline rock suite
EARTH AND PLANETARY SCIENCE LETTERS 15 (1972) 255-262. NORTH-HOLLAND PUBLISHING COMPANY THE GENESIS OF THE CALC-ALKALINE ROCK SUITE R.J. ARCULUS and E.B. CURRAN Department of Geology, University of Durham, Durham City, U.K. Received 22 January 1972 Revised version received 1 June 1972 The derivation of an …
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Early tholeiitic and calc-alkaline arc magmatism of middle to …
Analysis of middle and upper Eocene rocks from the IBM forearc, including the Ogasawara and Mariana Islands, help illuminate early arc volcanism of the proto-IBM arc. Dredged volcanic rocks from the forearc are two-pyroxene basalt to andesite, and may be divided into two groups, tholeiite and calc-alkaline, on the basis of mineralogy, petrography, and bulk …
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