Chemistry of upper Eocene microtektites
Late Eocene microtektites and crystal-bearing microkrystites extracted from DSDP and ODP cores from the Atlantic, Pacific, and Indian oceans have been analyzed to address their provenance. A new analysis of Nd and Sr isotopic compositions confirms previous work and the assignment of the uppermost mi...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.723058 2024-09-15T18:24:28+00:00 Chemistry of upper Eocene microtektites Whitehead, J Papanastassiou, D A Spray, J G Grieve, R A F Wasserburg, Gerald J MEDIAN LATITUDE: 33.797774 * MEDIAN LONGITUDE: 152.892065 * SOUTH-BOUND LATITUDE: 1.462200 * WEST-BOUND LONGITUDE: 63.300000 * NORTH-BOUND LATITUDE: 71.650000 * EAST-BOUND LONGITUDE: -72.773800 * DATE/TIME START: 1972-02-18T00:00:00 * DATE/TIME END: 1983-08-26T00:00:00 2000 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.723058 https://doi.org/10.1594/PANGAEA.723058 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.723058 https://doi.org/10.1594/PANGAEA.723058 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Whitehead, J; Papanastassiou, D A; Spray, J G; Grieve, R A F; Wasserburg, Gerald J (2000): Late Eocene impact ejecta: geochemical and isotopic connections with the Popigai impact structure. Earth and Planetary Science Letters, 181(4), 473-487, https://doi.org/10.1016/S0012-821X(00)00225-9 22-216 31-292 33-315 61-462 95-612 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//RIDGE Leg22 Leg31 Leg33 Leg61 Leg95 North Atlantic/SLOPE North Pacific/FAN North Pacific/Philippine Sea/CONT RISE dataset publication series 2000 ftpangaea https://doi.org/10.1594/PANGAEA.72305810.1016/S0012-821X(00)00225-9 2024-07-24T02:31:20Z Late Eocene microtektites and crystal-bearing microkrystites extracted from DSDP and ODP cores from the Atlantic, Pacific, and Indian oceans have been analyzed to address their provenance. A new analysis of Nd and Sr isotopic compositions confirms previous work and the assignment of the uppermost microtektite layer to the North American tektites, which are associated with the 35.5 Ma, 85 km diameter Chesapeake impact structure of Virginia, USA. Extensive major element and Nd and Sr isotopic analyses of the microkrystites from the lowermost layer were obtained. The melanocratic microkrystites from Sites 216 and 462 in the Indian and Pacific oceans possess major element chemistries, Sr and Nd isotopic signatures and Sm-Nd, T CHUR, model ages similar to those of tagamite melt rocks in the Popigai impact structure. They also possess Rb-Sr, T UR, model ages that are younger than the tagamite TCHUR ages by up to ~1 Ga, which require a process, as yet undefined, of Rb/Sr enrichment. These melanocratic microkrystites are consistent with a provenance from the 35.7 Ma, 100 km diameter Popigai impact structure of Siberia, Russia, while ruling out other contemporaneous structures as a source. Melanocratic microkrystites from other sites and leucocratic microkrystites from all sites possess a wide range of isotopic compositions (epsilon (143Nd) values of -16 to -27.7 and epsilon (87Sr) values of 4.1-354.0), making the association with Popigai tagamites less clear. These microkrystites may have been derived by the melting of target rocks of mixed composition, which were ejected without homogenization. Dark glass and felsic inclusions extracted from Popigai tagamites possess epsilon (143Nd) and epsilon (87Sr) values of -26.7 to -27.8 and 374.7 and 432.4, respectively, and T CHUR and T UR model ages of 1640-1870 Ma and 240-1830 Ma, respectively, which require the preservation of initially present heterogeneity in the source materials. The leucocratic microkrystites possess diverse isotopic compositions that may reflect the ... Other/Unknown Material North Atlantic Siberia PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(63.300000,-72.773800,71.650000,1.462200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
22-216 31-292 33-315 61-462 95-612 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//RIDGE Leg22 Leg31 Leg33 Leg61 Leg95 North Atlantic/SLOPE North Pacific/FAN North Pacific/Philippine Sea/CONT RISE |
spellingShingle |
22-216 31-292 33-315 61-462 95-612 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//RIDGE Leg22 Leg31 Leg33 Leg61 Leg95 North Atlantic/SLOPE North Pacific/FAN North Pacific/Philippine Sea/CONT RISE Whitehead, J Papanastassiou, D A Spray, J G Grieve, R A F Wasserburg, Gerald J Chemistry of upper Eocene microtektites |
topic_facet |
22-216 31-292 33-315 61-462 95-612 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//RIDGE Leg22 Leg31 Leg33 Leg61 Leg95 North Atlantic/SLOPE North Pacific/FAN North Pacific/Philippine Sea/CONT RISE |
description |
Late Eocene microtektites and crystal-bearing microkrystites extracted from DSDP and ODP cores from the Atlantic, Pacific, and Indian oceans have been analyzed to address their provenance. A new analysis of Nd and Sr isotopic compositions confirms previous work and the assignment of the uppermost microtektite layer to the North American tektites, which are associated with the 35.5 Ma, 85 km diameter Chesapeake impact structure of Virginia, USA. Extensive major element and Nd and Sr isotopic analyses of the microkrystites from the lowermost layer were obtained. The melanocratic microkrystites from Sites 216 and 462 in the Indian and Pacific oceans possess major element chemistries, Sr and Nd isotopic signatures and Sm-Nd, T CHUR, model ages similar to those of tagamite melt rocks in the Popigai impact structure. They also possess Rb-Sr, T UR, model ages that are younger than the tagamite TCHUR ages by up to ~1 Ga, which require a process, as yet undefined, of Rb/Sr enrichment. These melanocratic microkrystites are consistent with a provenance from the 35.7 Ma, 100 km diameter Popigai impact structure of Siberia, Russia, while ruling out other contemporaneous structures as a source. Melanocratic microkrystites from other sites and leucocratic microkrystites from all sites possess a wide range of isotopic compositions (epsilon (143Nd) values of -16 to -27.7 and epsilon (87Sr) values of 4.1-354.0), making the association with Popigai tagamites less clear. These microkrystites may have been derived by the melting of target rocks of mixed composition, which were ejected without homogenization. Dark glass and felsic inclusions extracted from Popigai tagamites possess epsilon (143Nd) and epsilon (87Sr) values of -26.7 to -27.8 and 374.7 and 432.4, respectively, and T CHUR and T UR model ages of 1640-1870 Ma and 240-1830 Ma, respectively, which require the preservation of initially present heterogeneity in the source materials. The leucocratic microkrystites possess diverse isotopic compositions that may reflect the ... |
format |
Other/Unknown Material |
author |
Whitehead, J Papanastassiou, D A Spray, J G Grieve, R A F Wasserburg, Gerald J |
author_facet |
Whitehead, J Papanastassiou, D A Spray, J G Grieve, R A F Wasserburg, Gerald J |
author_sort |
Whitehead, J |
title |
Chemistry of upper Eocene microtektites |
title_short |
Chemistry of upper Eocene microtektites |
title_full |
Chemistry of upper Eocene microtektites |
title_fullStr |
Chemistry of upper Eocene microtektites |
title_full_unstemmed |
Chemistry of upper Eocene microtektites |
title_sort |
chemistry of upper eocene microtektites |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.723058 https://doi.org/10.1594/PANGAEA.723058 |
op_coverage |
MEDIAN LATITUDE: 33.797774 * MEDIAN LONGITUDE: 152.892065 * SOUTH-BOUND LATITUDE: 1.462200 * WEST-BOUND LONGITUDE: 63.300000 * NORTH-BOUND LATITUDE: 71.650000 * EAST-BOUND LONGITUDE: -72.773800 * DATE/TIME START: 1972-02-18T00:00:00 * DATE/TIME END: 1983-08-26T00:00:00 |
long_lat |
ENVELOPE(63.300000,-72.773800,71.650000,1.462200) |
genre |
North Atlantic Siberia |
genre_facet |
North Atlantic Siberia |
op_source |
Supplement to: Whitehead, J; Papanastassiou, D A; Spray, J G; Grieve, R A F; Wasserburg, Gerald J (2000): Late Eocene impact ejecta: geochemical and isotopic connections with the Popigai impact structure. Earth and Planetary Science Letters, 181(4), 473-487, https://doi.org/10.1016/S0012-821X(00)00225-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.723058 https://doi.org/10.1594/PANGAEA.723058 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.72305810.1016/S0012-821X(00)00225-9 |
_version_ |
1810464834143125504 |