|
Document Type |
: |
Article In Journal |
|
Document Title |
: |
Geochemistry and Origin of Migmatites of Al-Zurbi Metamorphic Belt, SW Taiz, Republic of Yemen جيو كيميائية وأصل صخور المجماتيت لحزام الزربي المتحول جنوب غرب مدينة تعز_ جمهورية اليمن |
|
Subject |
: |
Earth Sciences |
|
Document Language |
: |
English |
|
Abstract |
: |
The metamorphic belt of AI-Zurbi area is situated in a tectnically
active region and was subjected to at least three regional deforrational
phases. ,
The belt is of amphibolite facies and comprises migmatites and non-~igmatitie
rocks. The migmatites are dominantly granitic in composition and
comprise migmatite leucosomes and migmatite palaeosomes fractions. The
chemistry and mineralogy of the migmatite palaeosomes are similar to
those of the gneisses. The migmatite leucosomes show stromatic and ptygmatic
structures. The average composition of the migmatite leucosomes accords
reasonably well with that of the low-Ca granites. The migm~tite
palaeosomes have higher total iron, Ti02, CaO, MgO, Sr, Ni, Zr, and Co
arid lower Si02, K20, Rb, Nb, Cu, and Y contents relative to the high-Ca
granitic rocks. The migmatite leucosomes are believed to have been formed
by partial melting of metasediments with different proportions of alkalis
and calcium, at relatively low temperatures and low water activity. The
melts were crystallized together with the unmelted solids (restites). |
|
ISSN |
: |
1012-8832 |
|
Journal Name |
: |
Earth Sciences Journal |
|
Volume |
: |
8 |
|
Issue Number |
: |
1 |
|
Publishing Year |
: |
1415 AH
1995 AD |
|
Number Of Pages |
: |
20 |
|
Article Type |
: |
Article |
|
Added Date |
: |
Sunday, October 11, 2009 |
|
Researchers
| صالح الخرباش | SALEH A. AL-KHIRBASH | Researcher | | |
| مصطفى سليمان | MOSTAFA M. SOLlMAN | Researcher | | |
| عبدالله باعيسى | ABDULLAH O. BA-ISSA | Researcher | | |
|