Petrology and geochemistry of late Tertiary/Quaternary mafic alkaline volcanism in Romania

Downes, Hilary; Seghedi, Ioan; Szakács, Alexandru; Dobosi, G.; James, D.; Vaselli, Orlando; Rigby, I.J.; Ingram, Gerry; Rex, D. C.; Pécskay, Zoltán

doi:10.1016/0024-4937(95)91152-y

Cited by 103 publications

(92 citation statements)

References 14 publications

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“…This observation is supported by the trace element ratios, such as K/Ba and Zr/Nb ratios [45]. The low content of Y and high TiO 2 /Y and Zr/Y ratios indicate that the source is garnet-bearing rocks [34] [46]. The spider diagram for normal mid-ocean ridge basalt (NMORB) for the studied volcanic rocks (Figure 8(a)) presented enrichment of the strongly incompatible LILE such as Ba and K, depletion of Nb relatively to K, enrichment of Pb over Ce, and light rare earth elements (LREE) enrichment (La and Ce) over heavy rare earth elements (HREE) and Y, which showed high similarity to MORB.…”

Section: Discussionmentioning

confidence: 78%

Contribution to the Petrography, Geochemistry, and Petrogenesis of Zarqa-Ma’in Pleistocene Alkali Olivine Basalt Flow of Central Jordan

Yaseen¹

2014

IJG

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The Zarqa-Ma'in basalt (MB) occurs near a plateau basalt (wadi fills) covering about 15 km 2 of Makawir, Ataruz, and Hammat um Hasana cone areas in central Jordan. The tectonic evolution occurred through intraplate volcanism and erupted through fissure systems along the Dead Sea, transforming the fault during Miocene to Pleistocene period. Three stages of eruption of MB have been recorded during Pleistocene from 6 to 0.6 Ma. The petrographic analyses data show that the MB rocks are composed of plagioclase, olivine, pyroxene, and magnetite, including secondary minerals calcite, iddingsite, serpentine, and zeolite. Furthermore, the MB rocks have narrow ranges of major and trace element concentrations, and are of under saturated silica type and belong to sodic alkaline magma series. The geochemical characteristics of MB indicate that MB was derived from a slightly fractionated magma as reflected by its high MgO (6.3 -11.7 ppm) concentration with Mg number from 0.41 to 0.61, low silica content (40.83 -47.55 wt%), and high Cr and Ni concentrations (115 -475 and 105 -553 ppm, respectively). This basalt exhibited low degree of partial melting (10%) for garnet peridotite mantle source. The model mineral fractionation showed that the MB could be fractionated to clinopyroxene, orthopyroxene, olivine, and plagioclase.

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Section: Discussionmentioning

confidence: 78%

Contribution to the Petrography, Geochemistry, and Petrogenesis of Zarqa-Ma’in Pleistocene Alkali Olivine Basalt Flow of Central Jordan

Yaseen¹

2014

IJG

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“…Alkalic basaltic rocks from Perșani Mts. are similar to other continental intraplate alkali 252 Brought to you by | MIT Libraries Authenticated Download Date | 5/9/18 10:40 PM basalts and plot in the trachybasaltic field [348], but have distinctively higher La/Nb and lower Ce/Pb ratios than the other alkaline basalts in the Pannonian Basin, suggesting a subduction-related component in their source region [23,348,349].…”

Section: Cȃlimani + Gurghiu + Harghita + Perșanimentioning

confidence: 69%

“…A slightly eroded alkali basaltic volcano, 2.4-2.6 Ma old, located along the South Transylvanian fault system southwest of the Apuseni Mountains (Figure 1-5) [130,153] suggests a shield volcano. Presently, the volcano is covered by Quaternary deposits, exposed only in quarries.…”

Section: Shield Volcanoes Related To Na-alkalic and Ultrapotassic Rocksmentioning

confidence: 99%

Neogene-Quaternary Volcanic forms in the Carpathian-Pannonian Region: a review

et al. 2010

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Neogene to Quaternary volcanic/magmatic activity in the Carpathian-Pannonian Region (CPR) occurred between 21 and 0.1 Ma with a distinct migration in time from west to east. It shows a diverse compositional variation in response to a complex interplay of subduction with roll-back, back-arc extension, collision, slab break-off, delamination, strike-slip tectonics and microplate rotations, as well as in response to further evolution of magmas in the crustal environment by processes of differentiation, crustal contamination, anatexis and magma mixing. Since most of the primary volcanic forms have been affected by erosion, especially in areas of post-volcanic uplift, based on the level of erosion we distinguish: (1) areas eroded to the basement level, where paleovolcanic reconstruction is not possible; (2) deeply eroded volcanic forms with secondary morphology and possible paleovolcanic reconstruction; (3) eroded volcanic forms with remnants of original morphology preserved; and (4) the least eroded volcanic forms with original morphology quite well preserved. The large variety of volcanic forms present in the area can be grouped in a) monogenetic volcanoes and b) polygenetic volcanoes and their subsurface/intrusive counterparts that belong to various rock series found in the CPR such as calc-alkaline magmatic rock-types (felsic, intermediate and mafic varieties) and alkalic types including K-alkalic, shoshonitic, ultrapotassic and Na-alkalic. The following volcanic/subvolcanic forms have been identified: (i) domes, shield volcanoes, effusive cones, pyroclastic cones, stratovolcanoes and calderas with associated intrusive bodies for intermediate and basic calc-alkaline volcanism; (ii) domes, calderas and ignimbrite/ash-flow fields for felsic calc-alkaline volcanism and (iii) dome flows, shield volcanoes, maars, tuffcone/tuff-rings, scoria-cones with or without related lava flow/field and their erosional or subsurface forms (necks/ plugs, dykes, shallow intrusions, diatreme, lava lake) for various types of K-and Na-alkalic and ultrapotassic magmatism. Finally, we provide a summary of the eruptive history and distribution of volcanic forms in the CPR using several sub-region schemes.

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“…Man tle-de rived ultra mafic xe no liths and pheno crysts of am phibole and py rox enes are fre quent in the tuffs and less com mon in lava flows of the al ka line vol ca nism (Kurat et al, 1991;Zanetti et al, 1995;Dobosi et al, 1998Dobosi et al, , 2003Dobosi and Jen ner, 1999;Demény et al, 2005). The most prom i nent oc cur rences are in the south east ern Styrian Ba sin, in ad ja cent Burgenland basement high, in Slovenia (Scharbert et al, 1981;Kurat et al, 1991;Balogh et al, 1994;Coltori et al, 2007;Kralj, 2011), in the Banat and South Harghita Moun tains (Downes et al, 1995b), in the Little Hun gar ian Plain (Falus et al, 2007), Nógrád (Koneèný et al, 1995a;Dobosi and Jen ner, 1999;Demény et al, 2005) and in the Balaton-Bakony area, Hun gary (Embey-Isztin et al, 2001;Dobosi et al, 2003;Nedli et al, 2009 Volcanological/geo phys i cal in ves ti gations were done for Altenmarkt and Riegers burg (Fritz, 1996a), Burgfeld-Beistein (Pö -schl, 1991) and the Grad volcanogenic field (Kralj, 2011), the Gleichenberg vol ca nic field (Winkler, 1913), Unterweissenbach and Gniebing (Murban, 1939), Kapfenstein (Winkler v. Hermaden, 1957), Limbach (Jugovics, 1916Sauerzopf, 1986) and Tobaj (Jugovics, 1916). Sum ma ries can be found in Sigmund (1899), Flügel and Heritsch (1968) and Fritz (1996b).…”

Section: Resultsmentioning

confidence: 99%

“…Fur ther crystallochemical stud ies con firm this gen e sis (Shaw and Eyzaguirre, 2000;Dobosi et al, 2003;Downes et al, 2004;Demeny et al, 2005). The pheno crysts were brought to the sur face by later basaltic magmatism (Downes et al, 1995b;Huraiová et al, 1996;Dobosi et al, 2003;Demeny et al, 2005). Clinopyroxene/amphi bole pheno crysts and ultra mafic xe no liths oc cur fre quently to gether and are also prob a bly formed from mafic mag mas at high pres sures (Dobosi et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

K/Ar geochronology of igneous amphibole phenocrysts in Miocene to Pliocene volcaniclastics, Styrian Basin, Austria

Bojar

Hałas

et al. 2013

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Petrology and geochemistry of late Tertiary/Quaternary mafic alkaline volcanism in Romania

Cited by 103 publications

References 14 publications

Contribution to the Petrography, Geochemistry, and Petrogenesis of Zarqa-Ma’in Pleistocene Alkali Olivine Basalt Flow of Central Jordan

Contribution to the Petrography, Geochemistry, and Petrogenesis of Zarqa-Ma’in Pleistocene Alkali Olivine Basalt Flow of Central Jordan

Neogene-Quaternary Volcanic forms in the Carpathian-Pannonian Region: a review

K/Ar geochronology of igneous amphibole phenocrysts in Miocene to Pliocene volcaniclastics, Styrian Basin, Austria

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