| Abstract: | Sodium-aluminum silicate gels are found in surftcial deposits as thick as 5 centimeters in the Magadi area of Kenya. Chemical data indicate they are formed by the interaction of hot alkaline springwaters (67?? to 82??C; pH, about 9) with alkali trachyte flows and their detritus, rather than by direct precipitation. In the process, Na2O is added from and silica is released to the saline waters of the springs. Algal mats protect the gels from erosion and act as thermal insulators. The gels are probably yearly accumulates that are washed into the lakes during floods. Crystallization of these gels in the laboratory yields analcite; this fact suggests that some analcite beds in lacustrine deposits may have formed from gels. Textural evidence indicates that cherts of rocks of the Pleistocene chert series in the Magadi area may have formed from soft sodium silicate gels. Similar gels may have acted as substrates for the accumulation and preservation of prebiological organic matter during the Precambrian. |
| Genre: | Article |
| ProdID: | 70011520 |
| Citation Author: | Eugster, H. P.; Jones, B. F. |
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| Citation End Page: | 163 |
| Citation Issue: | 3837 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Gels composed of sodium-aluminum silicate, Lake Magadi, Kenya; 1968; Article; Journal; Science; Eugster, H. P.; Jones, B. F. |
| Citation Start Page: | 160 |
| Citation Volume: | 161 |
| Citation Year: | 1968 |
| Type: | citation/reference |
| Text: | Gels composed of sodium-aluminum silicate, Lake Magadi, Kenya; 1968; Article; Journal; Science; Eugster, H. P.; Jones, B. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1968 00:00 -0600 |
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