Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland
The Martin Point section (western Newfoundland, Canada) spans the uppermost Cambrian Broom Point and Martin Point members of the Green Point Formation (upper Furongian). The investigated interval (~ 90 m) consists of rhythmites of thinly-bedded marine carbonates (lime mudstones) alternating with gre...
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ftmemorialuniv:oai:research.library.mun.ca:13971 2023-10-01T03:57:33+02:00 Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland Wang, Luyi 2019-03 application/pdf https://research.library.mun.ca/13971/ https://research.library.mun.ca/13971/1/thesis.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/13971/1/thesis.pdf Wang, Luyi <https://research.library.mun.ca/view/creator_az/Wang=3ALuyi=3A=3A.html> (2019) Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland. Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 2019 ftmemorialuniv 2023-09-03T06:49:32Z The Martin Point section (western Newfoundland, Canada) spans the uppermost Cambrian Broom Point and Martin Point members of the Green Point Formation (upper Furongian). The investigated interval (~ 90 m) consists of rhythmites of thinly-bedded marine carbonates (lime mudstones) alternating with green and black shale and thin conglomerate beds. Samples were extracted from the micritic carbonates and their preservation was petrographically and geochemically examined. The δ¹³Corg profile exhibits a positive shift (~ 2 ‰) associated with the globally well documented negative δ¹³Ccarb excursion at the HERB (Hellnmaria – Red Tops Boundary) and correlates with similar distinct shifts in the Al, Si, and ΣREE components, thus suggesting contributions from detrital organic matter relatively depleted in ¹²C likely induced by an eustatic sea-level drop and enhanced terrigenous inputs. Similarly, the δ¹⁵Norg variations are consistent with the proposed sea-level drop. This is also correlated with positive shifts on the Fe and Mn profiles reflecting overprinting of terrigenous inputs rather than reflecting the fluctuations in redox conditions. Thesis Newfoundland Memorial University of Newfoundland: Research Repository Broom Point ENVELOPE(-57.865,-57.865,49.833,49.833) Canada Green Point ENVELOPE(73.350,73.350,-53.083,-53.083) Martin Point ENVELOPE(-44.683,-44.683,-60.767,-60.767) |
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Open Polar |
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Memorial University of Newfoundland: Research Repository |
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ftmemorialuniv |
language |
English |
description |
The Martin Point section (western Newfoundland, Canada) spans the uppermost Cambrian Broom Point and Martin Point members of the Green Point Formation (upper Furongian). The investigated interval (~ 90 m) consists of rhythmites of thinly-bedded marine carbonates (lime mudstones) alternating with green and black shale and thin conglomerate beds. Samples were extracted from the micritic carbonates and their preservation was petrographically and geochemically examined. The δ¹³Corg profile exhibits a positive shift (~ 2 ‰) associated with the globally well documented negative δ¹³Ccarb excursion at the HERB (Hellnmaria – Red Tops Boundary) and correlates with similar distinct shifts in the Al, Si, and ΣREE components, thus suggesting contributions from detrital organic matter relatively depleted in ¹²C likely induced by an eustatic sea-level drop and enhanced terrigenous inputs. Similarly, the δ¹⁵Norg variations are consistent with the proposed sea-level drop. This is also correlated with positive shifts on the Fe and Mn profiles reflecting overprinting of terrigenous inputs rather than reflecting the fluctuations in redox conditions. |
format |
Thesis |
author |
Wang, Luyi |
spellingShingle |
Wang, Luyi Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland |
author_facet |
Wang, Luyi |
author_sort |
Wang, Luyi |
title |
Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland |
title_short |
Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland |
title_full |
Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland |
title_fullStr |
Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland |
title_full_unstemmed |
Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland |
title_sort |
paleoenvironmental changes across the late cambrian–early ordovician in western newfoundland |
publisher |
Memorial University of Newfoundland |
publishDate |
2019 |
url |
https://research.library.mun.ca/13971/ https://research.library.mun.ca/13971/1/thesis.pdf |
long_lat |
ENVELOPE(-57.865,-57.865,49.833,49.833) ENVELOPE(73.350,73.350,-53.083,-53.083) ENVELOPE(-44.683,-44.683,-60.767,-60.767) |
geographic |
Broom Point Canada Green Point Martin Point |
geographic_facet |
Broom Point Canada Green Point Martin Point |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
https://research.library.mun.ca/13971/1/thesis.pdf Wang, Luyi <https://research.library.mun.ca/view/creator_az/Wang=3ALuyi=3A=3A.html> (2019) Paleoenvironmental changes across the Late Cambrian–Early Ordovician in western Newfoundland. Masters thesis, Memorial University of Newfoundland. |
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thesis_license |
_version_ |
1778529062811074560 |