Hydrothermal alteration of plagioclase in granitic rocks from Proterozoic basement of SE Sweden

S. Morad, M. A.K. El-Ghali, M. A. Caja, M. Sirat, K. Al-Ramadan, H. Mansurbeg

نتاج البحث: المساهمة في مجلةمراجعة النظراء

25 اقتباسات (Scopus)

ملخص

Petrographic examinations and electron microprobe analyses of Proterozoic granitic rocks, SE Sweden aimed to characterize and unravel the mechanisms and conditions of plagioclase alterations. These alterations include saussuritization, albitization and replacement of plagioclase by K-feldspar. The hydrothermal alterations, which are inferred to have occurred at ca. 250-400°C, resulted in concomitant formation of Alrich titanite, epidote, calcite, pumpellyite, prehnite and iron oxides. Replacement of plagioclase by K-feldspar occurs in red-stained zones, which have developed close to thin fractures owing to the precipitation of tiny Fe-oxide pigment particles within the altered plagioclase, whereas saussuritized plagioclase has less systematic spatial relationships to these fractures. Albitization of plagioclase occurred in rocks that are poor in biotite compared to rocks that suffered extensive saussuritization. The chemical and textural characterization of various types of plagioclase alterations allows elucidation of the granitic hydrothermal systems. Features of feldspar alteration in the granitic rocks are similar to those encountered in feldspathic sandstones and should hence be considered in studies on diagenetic changes of siliciclastic successions during basin evolution.

اللغة الأصليةEnglish
الصفحات (من إلى)105-116
عدد الصفحات12
دوريةGeological Journal
مستوى الصوت45
رقم الإصدار1
المعرِّفات الرقمية للأشياء
حالة النشرPublished - يناير 2010
منشور خارجيًانعم

ASJC Scopus subject areas

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