AN INTRODUCTION TO CALC-ALKALINE LAMPROPHYRES (SPESSARTITES) AT SAGHEZ AREA

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TARKHANI M.S.; VOSSOUGHI ABEDINI M.; BAHARVAND N.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2010 | Volume:20 | Issue:77 (GEOLOGY ISSUE) Page(s): 237-251

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Title

AN INTRODUCTION TO CALC-ALKALINE LAMPROPHYRES (SPESSARTITES) AT SAGHEZ AREA

Author(s)

TARKHANI M.S. | VOSSOUGHI ABEDINI M. | BAHARVAND N. | Issue Writer Certificate

Keywords

SAGHEZ AREAQ3

SANANDAJ - SIRJAN ZONEQ3

LAMPROPHYREQ3

CRETACEOUS VOLCANIC ROCKSQ3

Abstract

Introduction: LAMPROPHYREs are a group of alkaline rocks which usually observed as sub-volcanic intrusions. They include abundant foliated minerals such as mica or amphibole.Spessartite is a type of LAMPROPHYREs that usually includes hornblende, pyroxene, albite, alkali feldspar and rarely quartz, also its plagioclase content is more than alkali feldspar’s.Spessartite bodies are usually observed around diorite and granitoid intrusions.Aim: introducing petrographical and geochemical characteristics of sub-volcanic spessartite bodies in SAGHEZ AREA (NW Kurdistan Prov.) which intruded within CRETACEOUS VOLCANIC ROCKS with lithology of andesite and basaltic andesite.Materials and methods: during a study on CRETACEOUS VOLCANIC ROCKS in SAGHEZ AREA, sometimes sub-volcanic bodies of spessartite (usually in dyke form) observed. Their characteristics in field studies are green color, foliated structure (which usually named diaschistic) and brecciation and oxidation of host rock. After field study and sampling, 10 thin sections prepared for petrographical studies and 9 specimens were analyzed by geochemical methods (XRF and ICP-MS).Results: during petrographical study, special pan-idiomorphic texture observed which formed by pyroxene phenocrysts and small automorphic hornblende grains within a background of plagioclase (albite), sometimes alkali feldspar, chlorite and calcite. Weak alteration (chloritization and carbonatization) usually affected these rocks also their fractures frequently filled by calcite, chlorite, albite and/or epidote. Based on particular classification of LAMPROPHYREs using light color minerals, the studied samples were named as spessartite (a calc-alkaline type). According to geochemical study, the analyzed samples located at the field of alkaline rocks. Also, rare earth elements’ diagrams show high concentration of LREEs.Moreover, high content of Ti and P in these rocks is considerable.Conclusion: Due to high content of plagioclase (albite) and hornblende (magnesiohornblende) and spatial relations of studied bodies with granitoid and diorite plutons, LAMPROPHYRE rocks in SAGHEZ AREA could be named as appinitic spessartites, while they show geochemical properties of spessartites and lamproites (extrusive LAMPROPHYREs). High concentration of LREEs in these rocks seems to happen due to low degree partial melting at mantle source, but we can’t forget possible crustal contamination of ascending magma.

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APA: Copy

TARKHANI, M.S., VOSSOUGHI ABEDINI, M., & BAHARVAND, N.. (2010). AN INTRODUCTION TO CALC-ALKALINE LAMPROPHYRES (SPESSARTITES) AT SAGHEZ AREA. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 20(77 (GEOLOGY ISSUE)), 237-251. SID. https://sid.ir/paper/70600/en

Vancouver: Copy

TARKHANI M.S., VOSSOUGHI ABEDINI M., BAHARVAND N.. AN INTRODUCTION TO CALC-ALKALINE LAMPROPHYRES (SPESSARTITES) AT SAGHEZ AREA. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2010;20(77 (GEOLOGY ISSUE)):237-251. Available from: https://sid.ir/paper/70600/en

IEEE: Copy

M.S. TARKHANI, M. VOSSOUGHI ABEDINI, and N. BAHARVAND, “AN INTRODUCTION TO CALC-ALKALINE LAMPROPHYRES (SPESSARTITES) AT SAGHEZ AREA,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 20, no. 77 (GEOLOGY ISSUE), pp. 237–251, 2010, [Online]. Available: https://sid.ir/paper/70600/en

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