Discovery of fossil micrometeorites from the Deccan trap intertrappeans
Abstract The Cretaceous–Paleogene (K‐Pg) boundary represents the extinction of ~70% of species, a prominent Chicxulub impact event and Deccan volcanism. This work reports the first attempt to extract the micrometeorites (MMs) from the Deccan intertrappean horizons. Eighty‐one spherical particles wer...
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crwiley:10.1111/maps.14256 2024-09-30T14:24:18+00:00 Discovery of fossil micrometeorites from the Deccan trap intertrappeans Singh, V. P. Rudraswami, N. G. Chalapathi Rao, Nittala V. Genge, Matthew J. Pandey, M. Sreekuttan, S. Chattopadhaya, S. Indian Space Research Organisation Ministry of Earth Sciences 2024 http://dx.doi.org/10.1111/maps.14256 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.14256 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science ISSN 1086-9379 1945-5100 journal-article 2024 crwiley https://doi.org/10.1111/maps.14256 2024-09-03T04:25:53Z Abstract The Cretaceous–Paleogene (K‐Pg) boundary represents the extinction of ~70% of species, a prominent Chicxulub impact event and Deccan volcanism. This work reports the first attempt to extract the micrometeorites (MMs) from the Deccan intertrappean horizons. Eighty‐one spherical particles were studied for their morphological, textural, and chemical characteristics. Intact cosmic spherules with ferromagnesian silicates (6) and Fe‐Ni oxide (7) compositions correspond to MMs from the deep sea and Antarctica. Silicate and Fe‐Ni spherules in this study showcase remarkable preservation, a testament to the highly favorable conditions present. Fe spherules (38) with iron oxide compositions exhibit diagenetic alteration during preservation. Textural analysis of 30 Fe spherules reveals a dendritic, interlocking pattern and slightly elevated Mn content, suggesting these may be fossilized I‐type MMs. However, eight Fe spherules with blocky and cubical granular textures resemble oxidized pyrite spherules. Al‐Fe‐Si spherules (30) possess a significant enrichment of Al and Si within their Fe‐oxide‐dominated composition. Group‐I Al‐Fe‐Si spherules (15) display zoned Al‐Fe‐Si oxide composition, dendritic Mg‐Cr spinel grains, and aerodynamic features, all indicative of impact spherules. The finding of these impact spherules from sampled Deccan intertrappean layer raises the possibility that these paleosols were deposited during the Chicxulub impact event, the only identified impact event with global distribution during the Deccan volcanism time frame. This unique location provides an opportunity for the simultaneous collection of well‐preserved MMs, impact, and volcanic spherules. The exceptional preservation of the studied MMs is likely due to a combination of non‐marine environments, atypical climatic conditions, and rapid deposition. This study further investigates the potential role of cosmic dust flux in the K‐Pg extinction event. We propose that the enhanced cosmic dust flux, a likely scenario during the K‐Pg ... Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library Meteoritics & Planetary Science |
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English |
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Abstract The Cretaceous–Paleogene (K‐Pg) boundary represents the extinction of ~70% of species, a prominent Chicxulub impact event and Deccan volcanism. This work reports the first attempt to extract the micrometeorites (MMs) from the Deccan intertrappean horizons. Eighty‐one spherical particles were studied for their morphological, textural, and chemical characteristics. Intact cosmic spherules with ferromagnesian silicates (6) and Fe‐Ni oxide (7) compositions correspond to MMs from the deep sea and Antarctica. Silicate and Fe‐Ni spherules in this study showcase remarkable preservation, a testament to the highly favorable conditions present. Fe spherules (38) with iron oxide compositions exhibit diagenetic alteration during preservation. Textural analysis of 30 Fe spherules reveals a dendritic, interlocking pattern and slightly elevated Mn content, suggesting these may be fossilized I‐type MMs. However, eight Fe spherules with blocky and cubical granular textures resemble oxidized pyrite spherules. Al‐Fe‐Si spherules (30) possess a significant enrichment of Al and Si within their Fe‐oxide‐dominated composition. Group‐I Al‐Fe‐Si spherules (15) display zoned Al‐Fe‐Si oxide composition, dendritic Mg‐Cr spinel grains, and aerodynamic features, all indicative of impact spherules. The finding of these impact spherules from sampled Deccan intertrappean layer raises the possibility that these paleosols were deposited during the Chicxulub impact event, the only identified impact event with global distribution during the Deccan volcanism time frame. This unique location provides an opportunity for the simultaneous collection of well‐preserved MMs, impact, and volcanic spherules. The exceptional preservation of the studied MMs is likely due to a combination of non‐marine environments, atypical climatic conditions, and rapid deposition. This study further investigates the potential role of cosmic dust flux in the K‐Pg extinction event. We propose that the enhanced cosmic dust flux, a likely scenario during the K‐Pg ... |
author2 |
Indian Space Research Organisation Ministry of Earth Sciences |
format |
Article in Journal/Newspaper |
author |
Singh, V. P. Rudraswami, N. G. Chalapathi Rao, Nittala V. Genge, Matthew J. Pandey, M. Sreekuttan, S. Chattopadhaya, S. |
spellingShingle |
Singh, V. P. Rudraswami, N. G. Chalapathi Rao, Nittala V. Genge, Matthew J. Pandey, M. Sreekuttan, S. Chattopadhaya, S. Discovery of fossil micrometeorites from the Deccan trap intertrappeans |
author_facet |
Singh, V. P. Rudraswami, N. G. Chalapathi Rao, Nittala V. Genge, Matthew J. Pandey, M. Sreekuttan, S. Chattopadhaya, S. |
author_sort |
Singh, V. P. |
title |
Discovery of fossil micrometeorites from the Deccan trap intertrappeans |
title_short |
Discovery of fossil micrometeorites from the Deccan trap intertrappeans |
title_full |
Discovery of fossil micrometeorites from the Deccan trap intertrappeans |
title_fullStr |
Discovery of fossil micrometeorites from the Deccan trap intertrappeans |
title_full_unstemmed |
Discovery of fossil micrometeorites from the Deccan trap intertrappeans |
title_sort |
discovery of fossil micrometeorites from the deccan trap intertrappeans |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1111/maps.14256 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.14256 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Meteoritics & Planetary Science ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/maps.14256 |
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Meteoritics & Planetary Science |
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1811640466512281600 |