Igneous Petrogenesis

Wilson, Marjorie

doi:10.1007/978-94-010-9388-0

Cited by 330 publications

(482 citation statements)

References 431 publications

(862 reference statements)

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“…The TAS diagram can also be used to find the magma series [34,36,37] (Figure 2b). Based on Figure 2b, the magma characteristics in the study area are associated with an affinity series of moderate-K calc-alkaline to high-K calc-alkaline.…”

Section: Resultsmentioning

confidence: 99%

Rock Magnetic, Petrography, and Geochemistry Studies of Lava at the Ijen Volcanic Complex (IVC), Banyuwangi, East Java, Indonesia

et al. 2018

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Lava has complex geochemical characteristics based on differences in eruption centers, eruptive events, and flow emplacement. Characterization of lava is useful for understanding the geological conditions of a volcanic region. To complement geochemical methods, rock magnetic methods are being used to analyze lava. To explore the potential uses of rock magnetic methods for lava characterization, a series of magnetic measurements were completed in lava samples from eight locations in the Ijen Volcanic Complex (IVC) in Banyuwangi, East Java, Indonesia. These locations were grouped into two eruption centers: Ijen Crater and Mount Anyar. The magnetic measurements included frequency-dependent magnetic susceptibility, thermomagnetic, anhysteretic remanent magnetization (ARM), isothermal remanent magnetization (IRM), and hysteresis curve analyses. These measurements were supplemented using X-ray fluorescence, petrography analyses, and Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS). Based on their lithology, lava samples were categorized into basalt, basaltic andesite, and basaltic trachyandesite. The dominant magnetic mineral contained in the sample was iron-rich titanomagnetite and titanium-rich titanomagnetite with a magnetic pseudo-single-domain and small amounts of superparamagnetic grain minerals in some samples. The significant difference in mass specific susceptibility (χ LF ) is caused by differences in the crystallization process. The differences in susceptibility frequency dependence (χ FD ) highlighted the differences in the magma cooling rate, demonstrated by the differences in the percentage of opaque mineral groundmass. The rock magnetic method was proven to support the geochemistry and petrography methods used to characterize lava and identify the causes of differences in lava characteristics.

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Section: Resultsmentioning

confidence: 99%

Rock Magnetic, Petrography, and Geochemistry Studies of Lava at the Ijen Volcanic Complex (IVC), Banyuwangi, East Java, Indonesia

et al. 2018

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“…Because there is a general geochemical correlation with the geological environment (juvenile crust vs. Archaean domain) and with the country rock (not necessarily intrusion wall rock), contamination probably took place in the upper crust. The elevated contents of Rb and Th, which have higher abundances in the upper than in the lower crust (Wilson, 1993), also favour the upper crust as the principal contaminant. In Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Da-Data from Huhma (1986Huhma ( , 1987, Patchett & Kouvo (1986), (Aitcheson & Forrest, 1994). In the AFC process (Assimilation and Fractional Crystallisation, DePaolo, 1981), contamination is accompanied by concurrent fractional crystallization and this is widely considered to occur in magma chambers, where the heat released by crystallization allows fusion of wall rocks (Wilson, 1993). In the AFC process, the most fractionated rocks should be most contaminated, because the residual melt has a longer time to interact with the contaminant than the melt represented by the early cumulates.…”

Section: Discussionmentioning

confidence: 99%

Sm-Nd data for mafic-ultramafic intrusions in the Svecofennian (1.88 Ga) Kotalahti Nickel Belt, Finland - Implications for crustal contamination at the Archaean/Proterozoic boundary

Makkonen¹,

Huhma²

2007

Bull Geol Soc Finland

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Sm-Nd data were determined for eight mafic-ultramafic intrusions from the Svecofennian (1.88 Ga) Kotalahti Nickel Belt, Finland. The intrusions represent both mineralized and barren types and are located at varying distances from the Archaean/Proterozoic boundary. The samples for the 23 Sm-Nd isotope analyses were taken mostly from the ultramafic differentiates. Results show a range in initial ε Nd values at 1880 Ma from -2.4 to +2.0. No relaNo relationship can be found between the degree of Ni mineralization and initial ε Nd values, while a correlation with the geological domain and country rocks is evident. The Majasaari and Törmälä intrusions, which have positive ε Nd values, were emplaced within the Svecofennian domain in proximity to 1.92 Ga tonalitic gneisses, which have previously yielded initial ε Nd values of ca. +3. In contrast, the Luusniemi intrusion, which has an ε Nd value of -2.4 is situated close to exposed Archaean crust. Excluding two analyses from the Rytky intruArchaean crust. Excluding two analyses from the Rytky intru-. Excluding two analyses from the Rytky intrusion, all data from the Koirus N, Koirus S, Kotalahti, Rytky and Kylmälahti intrusions, within error limits, fall in the range -0.7 ± 0.3. The results support the concept of contamination by Archaean material in proximity to the currently exposed craton margin. The composition of the proposed parental magma for the intrusions is close to EMORB, with initial ε Nd values near +4.

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“…Most of the mafic rocks in North Qaidam show the characteristics of evolved magmas in disequilibrium with primary melts which have Mg# > 72, Cr > 1000 ppm and Ni > 400 ppm (Wilson, 1989;Niu and O'Hara, 2008). Sample 13MH-18 from the Yingfeng dolerites/basalts is least-evolved with high MgO (11.5 wt.%), Mg# (71), and 22 / 54 compatible element contents (Cr = 600 ppm and Ni = 178 ppm), and is closest to the composition of picritic magma (MgO = 12 wt.%; Le Bas, 2000).…”

Section: Fractional Crystallizationmentioning

confidence: 99%

An 850–820Ma LIP dismembered during breakup of the Rodinia supercontinent and destroyed by Early Paleozoic continental subduction in the northern Tibetan Plateau, NW China

Song

Allen

et al. 2016

Precambrian Research

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Igneous Petrogenesis

Cited by 330 publications

References 431 publications

Rock Magnetic, Petrography, and Geochemistry Studies of Lava at the Ijen Volcanic Complex (IVC), Banyuwangi, East Java, Indonesia

Rock Magnetic, Petrography, and Geochemistry Studies of Lava at the Ijen Volcanic Complex (IVC), Banyuwangi, East Java, Indonesia

Sm-Nd data for mafic-ultramafic intrusions in the Svecofennian (1.88 Ga) Kotalahti Nickel Belt, Finland - Implications for crustal contamination at the Archaean/Proterozoic boundary

An 850–820Ma LIP dismembered during breakup of the Rodinia supercontinent and destroyed by Early Paleozoic continental subduction in the northern Tibetan Plateau, NW China

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