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Document Type |
: |
Article In Journal |
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Document Title |
: |
Geochemistry and Depositional Environments of the Tertiary Clays in Makkah and Rabigh Quadrangles, West Central Arabian Shield, Saudi Arabia جيوكيميائية وبيئات ترسيب الرواسب الطينية في العصر الثالث بمربعي مكة ورابغ ، غرب وسط الدرع العربي ، المملكة العربية السعودية |
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Subject |
: |
Earth Sciences |
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Document Language |
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English |
|
Abstract |
: |
The present work deals with a detailed chemical study on
the clay mineral assemblages characterizing some clay deposits,
shales and mudstones, which differ in their texture, colour, lithology,
and depositional environments. Samples selected from seven Tertiary
formations located in Makkah and Rabigh quadrangles are chemically
analyzed; some are used as environmental discriminators.
The distribution of major and some trace elements in 77 samples
has been investigated and the results obtained were tabulated and
graphically illustrated. A wide range of variation is shown in the results
of both major and trace constituents. This is due to their variable
content of clay mineral constituents and the abundance or paucity of
other admixtures, e.g. quartz, feldspar and minor heavy mineral
grains. The local occurrence of minor gypsum and carbonate veinlets
in some formations and ferrugination in others are also effective.
A positive correlation exists in some formations between Fe2O3
and each of MnO, Cr, Ni, Cu & Zn; between each of Sr & Cu versus
CaO; and in most cases between Ga and Al2O3. Whereas SiO2 shows
a negative correlation with each of Al2O3 and L.O.I .
Most of trace elements entered the depositional basin in close association
with clay minerals and Ca-Fe-bearing detritus.
The examined clay minerals and their trace elements are mainly
source controlled (e.g. granitic and some pelitic rocks) and, an environmental
illustration using Ga, B & Rb in a ternary diagram would
98 R.J. Taj et al.
indicate transitional to marine depositional environments for the studied
clay deposits. |
|
ISSN |
: |
1012-8832 |
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Journal Name |
: |
Earth Sciences Journal |
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Volume |
: |
15 |
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Issue Number |
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1 |
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Publishing Year |
: |
1425 AH
2004 AD |
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Number Of Pages |
: |
41 |
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Article Type |
: |
Article |
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Added Date |
: |
Sunday, October 11, 2009 |
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Researchers
| رشدي جمال تاج | R. J. TAJ | Researcher | | |
| نادي أديب سعد | N. A. SAAD | Researcher | | |
| محمد أبو اليزيد العسكري | M. A. EL-ASKARY | Researcher | | |
| محمد حسين بسيوني | M. H. BASYONI | Researcher | | |
|