Bottle Green Microtektites
| Autor: | B. P. Glass |
|---|---|
| Rok vydání: | 1972 |
| Předmět: |
Atmospheric Science
business.product_category Ecology Geochemistry Paleontology Soil Science Mineralogy Forestry Aquatic Science Oceanography Igneous rock Geophysics Space and Planetary Science Geochemistry and Petrology High magnesium Earth and Planetary Sciences (miscellaneous) Bottle Rock types business Geology Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research. 77:7057-7064 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/jb077i035p07057 |
| Popis: | Transparent bottle green microtektites with SiO2 contents of as low as 48% and MgO contents of as high as 24% have been found in deep-sea sediments in association with both the normal Australasian and the Ivory Coast microtektites. Bottle green microtektites have been found only in the layers of the cores containing the normal microtektites. The bottle green microtektites can be distinguished from igneous glasses by their lack of vesicles and crystalline inclusions and by their chemistry; i.e., bottle green microtektites (like tektites) have higher MgO and lower Na2O contents than igneous glasses with the same SiO2 contents. Australasian bottle green microtektites overlap and extend all major element trends found for a group of high magnesium Australasian tektites defined by Chapman and Scheiber (1969). The high Al2O3 contents and the high MgO contents distinguish the bottle green microtektites from all major rock types. Thus the presence of these unusual glasses in both the Australasian and the Ivory Coast strewnfield places an important constraint on theories concerning the origin of tektites. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text