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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1982
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| Online Access: | https://doi.org/10.1594/PANGAEA.772152 |
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| _version_ | 1867172318063624192 |
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| author | Alvarez, Walter Asaro, Frank Michel, Helen V Alvarez, Luis W |
| author_facet | Alvarez, Walter Asaro, Frank Michel, Helen V Alvarez, Luis W |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | An iridium anomaly has been found in coincidence with the known microtektite level in cores from Deep Sea Drilling Project site 149 in the Caribbean Sea. The iridium was probably not in the microtektites but deposited simultaneously with them; this could occur if the iridium was deposited from a dust cloud resulting from a bolide impact, as suggested for the anomaly associated with the Cretaceous-Tertiary boundary. Other workers have deduced that the microtektites are part of the North American strewn tektite field, which is dated at about 34 million years before present, and that the microtektite horizon in deep-sea cores is synchronous with the extinction of five radiolarian species. Mass extinctions also occur in terrestrial mammals within 4 million years of this time. The iridium anomaly and the tektites and microtektites are supportive of a major bolide impact about 34 million years ago. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_772152 |
| institution | PANGAEA |
| language | en |
| publishDate | 1982 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Element analyses of DSDP Hole 15-149 Alvarez, Walter Asaro, Frank Michel, Helen V Alvarez, Luis W 15-149; Calcium; Calcium, standard deviation; Caribbean Sea/BASIN; Chromium; Chromium, standard deviation; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Iridium; Iridium, standard deviation; Leg15; Nickel; Nickel, standard deviation; Sample code/label An iridium anomaly has been found in coincidence with the known microtektite level in cores from Deep Sea Drilling Project site 149 in the Caribbean Sea. The iridium was probably not in the microtektites but deposited simultaneously with them; this could occur if the iridium was deposited from a dust cloud resulting from a bolide impact, as suggested for the anomaly associated with the Cretaceous-Tertiary boundary. Other workers have deduced that the microtektites are part of the North American strewn tektite field, which is dated at about 34 million years before present, and that the microtektite horizon in deep-sea cores is synchronous with the extinction of five radiolarian species. Mass extinctions also occur in terrestrial mammals within 4 million years of this time. The iridium anomaly and the tektites and microtektites are supportive of a major bolide impact about 34 million years ago. |
| title | (Table 1) Element analyses of DSDP Hole 15-149 |
| topic | 15-149; Calcium; Calcium, standard deviation; Caribbean Sea/BASIN; Chromium; Chromium, standard deviation; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Iridium; Iridium, standard deviation; Leg15; Nickel; Nickel, standard deviation; Sample code/label |
| url | https://doi.org/10.1594/PANGAEA.772152 |