Tektites in the Geological Record: Showers of Glass from the SkyGeological Society of London, 2001 - 256 pagine This text commences with the history of tektites, from mediaeval China, through finds in Czechoslovakia in the 18th century and Darwin's description while on the Beagle, to 20th-century finds in South East Asia, the Ivory Coast and the USA. The four major strewn fields are described, followed by their extension by deep sea finds of microtektites and the recognition of irregular, large layered tektites in SE Asia. |
Sommario
FOREWORD by Sir Patrick Moore | 1 |
The strewn fields | 10 |
Microtektites | 51 |
Muong Nongtype tektites | 73 |
The age paradox | 94 |
The source of tektites | 105 |
Darwin Glass and Libyan Desert Glass | 144 |
Other related occurrences of natural glass | 161 |
Discussion | 199 |
Applications of isotope geochemistry | 219 |
GLOSSARY | 223 |
| 231 | |
| 250 | |
Parole e frasi comuni
ablated analyses anomaly appears associated Australasian Australasian Strewn Field Australia authors Average bediasites believed Bosumtwi boundary breccia Central Chapter chemical China close composition concentration contain contents cores Cpx spherules crater Darwin Glass deposits described determined diameter distribution DSDP Earth element Eocene et al event evidence favoured flange formation fragments geological Glass higher impact impactite inclusions indicated Indo-China isotope Italy Ivory Coast known Koeberl lake late layer Libyan Desert Glass lower major mass material melt meteorite microtektites mineral moldavites Muong Nong-type tektites North American noted objects occurrence Ocean origin Pleistocene possible present processes produced quartz range rare ratios recorded recovered recoveries reported Ries Structure rocks samples Science sedimentary sediments shapes shock showing silica similar SiO2 source structure South spherules splash forms Strewn Field structure studies suggested surface Table terrestrial trace volcanic