Sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, Upper Miocene, Menorca, Spain
Cross‐bedded grainstones on carbonate ramps and shelves are commonly related to the locus of major wave energy absorption such as shorelines, shoals or shelf breaks. In contrast, on the Early Tortonian carbonate platform of Menorca (Balearic Islands), coarse‐grained, cross‐bedded grainstones are fou...
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crwiley:10.1046/j.1365-3091.2002.00436.x 2024-06-09T07:49:08+00:00 Sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, Upper Miocene, Menorca, Spain Pomar, Luis Obrador, Antonio Westphal, Hildegard 2002 http://dx.doi.org/10.1046/j.1365-3091.2002.00436.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3091.2002.00436.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3091.2002.00436.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 49, issue 1, page 139-169 ISSN 0037-0746 1365-3091 journal-article 2002 crwiley https://doi.org/10.1046/j.1365-3091.2002.00436.x 2024-05-16T14:25:04Z Cross‐bedded grainstones on carbonate ramps and shelves are commonly related to the locus of major wave energy absorption such as shorelines, shoals or shelf breaks. In contrast, on the Early Tortonian carbonate platform of Menorca (Balearic Islands), coarse‐grained, cross‐bedded grainstones are found at a distance from the palaeoshoreline where they were deposited below the wavebase. Excellent exposures along continuous outcrops on the sea cliffs of Menorca reveal the depositional profile and three‐dimensional distribution of the different facies belts of the Tortonian ramp depositional system. Basinward from the palaeoshoreline, fan deltas and beach deposits pass into 5‐km‐wide gently dipping bioturbated dolopackstone (inner and middle ramp), then into 12–20°‐dipping dolograinstone/rudstone clinobeds (ramp slope) and, finally, into subhorizontal fine‐grained basinal dolowackestone to dolopackstone (outer ramp). In this Miocene example, coarse‐grained grainstones exist in five different settings other than beach deposits: (1) on the middle ramp, where cross‐bedded grainstones were deposited by currents roughly parallel to the shoreline at 40–70 m estimated water depth and are interbedded with gently dipping bioturbated dolomitized packstones; (2) on the upper slope, where clinobeds are composed mostly of in situ rhodoliths and red‐algae fragments; (3) on the lower slope, as small‐scale bedforms (small three‐dimensional subaqueous dunes) migrating parallel to the slope; (4) at the transition between the lower slope and the outer ramp, where mollusc‐rich and rhodolithic rudstones and grainstones, interbedded in dolomitized laminated wackestones containing abundant planktonic foraminifera, infill slide/slump scars as upslope‐backstepping bodies (backsets); (5) at the toe of the slope, where coarse skeletal grainstones indicate bedform migration parallel to the platform margin, induced by currents at more than 150 m estimated water depth. This Late Miocene example also illustrates how changes in intrabasinal ... Article in Journal/Newspaper Planktonic foraminifera Wiley Online Library The Toe ENVELOPE(-59.167,-59.167,-62.333,-62.333) Sedimentology 49 1 139 169 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Cross‐bedded grainstones on carbonate ramps and shelves are commonly related to the locus of major wave energy absorption such as shorelines, shoals or shelf breaks. In contrast, on the Early Tortonian carbonate platform of Menorca (Balearic Islands), coarse‐grained, cross‐bedded grainstones are found at a distance from the palaeoshoreline where they were deposited below the wavebase. Excellent exposures along continuous outcrops on the sea cliffs of Menorca reveal the depositional profile and three‐dimensional distribution of the different facies belts of the Tortonian ramp depositional system. Basinward from the palaeoshoreline, fan deltas and beach deposits pass into 5‐km‐wide gently dipping bioturbated dolopackstone (inner and middle ramp), then into 12–20°‐dipping dolograinstone/rudstone clinobeds (ramp slope) and, finally, into subhorizontal fine‐grained basinal dolowackestone to dolopackstone (outer ramp). In this Miocene example, coarse‐grained grainstones exist in five different settings other than beach deposits: (1) on the middle ramp, where cross‐bedded grainstones were deposited by currents roughly parallel to the shoreline at 40–70 m estimated water depth and are interbedded with gently dipping bioturbated dolomitized packstones; (2) on the upper slope, where clinobeds are composed mostly of in situ rhodoliths and red‐algae fragments; (3) on the lower slope, as small‐scale bedforms (small three‐dimensional subaqueous dunes) migrating parallel to the slope; (4) at the transition between the lower slope and the outer ramp, where mollusc‐rich and rhodolithic rudstones and grainstones, interbedded in dolomitized laminated wackestones containing abundant planktonic foraminifera, infill slide/slump scars as upslope‐backstepping bodies (backsets); (5) at the toe of the slope, where coarse skeletal grainstones indicate bedform migration parallel to the platform margin, induced by currents at more than 150 m estimated water depth. This Late Miocene example also illustrates how changes in intrabasinal ... |
format |
Article in Journal/Newspaper |
author |
Pomar, Luis Obrador, Antonio Westphal, Hildegard |
spellingShingle |
Pomar, Luis Obrador, Antonio Westphal, Hildegard Sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, Upper Miocene, Menorca, Spain |
author_facet |
Pomar, Luis Obrador, Antonio Westphal, Hildegard |
author_sort |
Pomar, Luis |
title |
Sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, Upper Miocene, Menorca, Spain |
title_short |
Sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, Upper Miocene, Menorca, Spain |
title_full |
Sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, Upper Miocene, Menorca, Spain |
title_fullStr |
Sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, Upper Miocene, Menorca, Spain |
title_full_unstemmed |
Sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, Upper Miocene, Menorca, Spain |
title_sort |
sub‐wavebase cross‐bedded grainstones on a distally steepened carbonate ramp, upper miocene, menorca, spain |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1046/j.1365-3091.2002.00436.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3091.2002.00436.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3091.2002.00436.x |
long_lat |
ENVELOPE(-59.167,-59.167,-62.333,-62.333) |
geographic |
The Toe |
geographic_facet |
The Toe |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Sedimentology volume 49, issue 1, page 139-169 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-3091.2002.00436.x |
container_title |
Sedimentology |
container_volume |
49 |
container_issue |
1 |
container_start_page |
139 |
op_container_end_page |
169 |
_version_ |
1801381339487797248 |