Igneous petrology of the Bulfat area (North-East Iraqi Zagros thrust zone)
Two intrusions can be distinguished in the Bulfat-postcollision igneous complex, an older one with a nearly complete differentiation series; from ultrabasic rocks through to nepneline syenite and younger one composed of olivine gabbro, with olivine diorite at the chilled margin. Peridotite occurs at...
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1993
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| Sorozat: | Acta mineralogica-petrographica
34 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24807 |
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| 040 | |a SZTE Egyetemi Kiadványok Repozitórium |b hun | ||
| 041 | |a eng | ||
| 100 | 1 | |a Buda György | |
| 245 | 1 | 0 | |a Igneous petrology of the Bulfat area (North-East Iraqi Zagros thrust zone) |h [elektronikus dokumentum] / |c Buda György |
| 260 | |a University of Szeged, Department of Mineralogy, Geochemistry and Petrology |b Szeged |c 1993 | ||
| 300 | |a 21-39 | ||
| 490 | 0 | |a Acta mineralogica-petrographica |v 34 | |
| 520 | 3 | |a Two intrusions can be distinguished in the Bulfat-postcollision igneous complex, an older one with a nearly complete differentiation series; from ultrabasic rocks through to nepneline syenite and younger one composed of olivine gabbro, with olivine diorite at the chilled margin. Peridotite occurs at the lowest part of the older intrusion, probably tectonically emplaced. The original rock was harzburgite but most has been altered to serpentinite. The older intrusion is composed predominantly of gabbro and diorite, both containing many xenoliths. The chemical composition of these rocks differ from the normal calc-alkaline magmatic suite. Calcium enrichment is widespread due to magmatic assimilation of the calcareous rocks. At the latter stage of differentiation silica migrated into the host country rocks where a skarn zone developed, this caused silica deficiency in the magma and locally nepheline crystallized at the expense of alkali feldspars. This complex process of assimilation ana silica migration resulted in the original calc-alkaline magma changing to an alkalic-calcic suite. Foliation and mylonitization are widespread due to intensive tectonism during the emplacement and cooling of the magma. The younger olivine gabbro and diorite intruded through the older igneous complex without calcareous rock assimilation. A slight alkali characteristics (e.g. kaersutite) is observed suggesting crustal contamination. The igneous complex is considered to be a postcollision event with emplacement into the continental crust after the Arabian and Iranian plates collided during late Cretaceous or early Paleogene. | |
| 650 | 4 | |a Természettudományok | |
| 650 | 4 | |a Föld- és kapcsolódó környezettudományok | |
| 695 | |a Kőzettan, Ásványtan, Földtan | ||
| 856 | 4 | 0 | |u http://acta.bibl.u-szeged.hu/24807/1/mineralogica_034_021-039.pdf |z Dokumentum-elérés |