Geochemistry and isotopes at DSDP Hole 79-546
At Site 546, below the Mazagan Escarpment at a water depth of 4 km, 36 m of salt rock was cored from the top of one of a field of salt domes. The core was studied by thin section and a variety of geochemical procedures. The salt rock contains 0.1 to 3% carnallite and lesser amounts of sylvite and po...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.808523 2024-09-15T18:23:58+00:00 Geochemistry and isotopes at DSDP Hole 79-546 Holser, William T Saltzman, Eric S Brookins, Douglas G LATITUDE: 33.778500 * LONGITUDE: -9.564300 * DATE/TIME START: 1981-05-01T00:00:00 * DATE/TIME END: 1981-05-01T00:00:00 1984 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.808523 https://doi.org/10.1594/PANGAEA.808523 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.808523 https://doi.org/10.1594/PANGAEA.808523 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Holser, William T; Saltzman, Eric S; Brookins, Douglas G (1984): Geochemistry and petrology of evaporites cored from a deep-sea diapir at Site 546 offshore Morocco. In: Hinz, K; Winterer, EL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 79, 509-540, https://doi.org/10.2973/dsdp.proc.79.117.1984 79-546 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg79 North Atlantic/PLATEAU dataset publication series 1984 ftpangaea https://doi.org/10.1594/PANGAEA.80852310.2973/dsdp.proc.79.117.1984 2024-07-24T02:31:21Z At Site 546, below the Mazagan Escarpment at a water depth of 4 km, 36 m of salt rock was cored from the top of one of a field of salt domes. The core was studied by thin section and a variety of geochemical procedures. The salt rock contains 0.1 to 3% carnallite and lesser amounts of sylvite and polyhalite, which with the corresponding high level of bromide place it within the potash evaporite facies. The bromide profile is of a dominantly marine evaporite deposited in moderately shallow brine which, however, was not repeatedly desiccated. A mineralogical argument suggests that the brine surface was not below sea level. An average of about 5% elastics, with dispersed anhydrite, darken the salt rock to deep shades of red, brown, and gray green. Most of the included materials are in highly deformed boudins or dispersions in the salt rock that has also undergone cataclasis in a subsequent, probably tectonic, deformation. The salt rock is slightly deficient in anhydrite, and the usual separate beds and laminae of anhydrite are virtually absent. Stable isotope ratios of sulfur and oxygen in the sulfate are clearly derived from sea water of Permian to Scythian age, in contrast to the late Triassic or Early Jurassic age of evaporites onshore in Morocco and Portugal and the corresponding evaporites offshore Maritime Canada. In contrast to those evaporites off the axis of Atlantic rifting, the salt at Site 546 may have been deposited in a very early central rift fed by marine waters from Tethys through the Gibraltar or South Atlas fracture zones. Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-9.564300,-9.564300,33.778500,33.778500) |
institution |
Open Polar |
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PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
79-546 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg79 North Atlantic/PLATEAU |
spellingShingle |
79-546 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg79 North Atlantic/PLATEAU Holser, William T Saltzman, Eric S Brookins, Douglas G Geochemistry and isotopes at DSDP Hole 79-546 |
topic_facet |
79-546 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg79 North Atlantic/PLATEAU |
description |
At Site 546, below the Mazagan Escarpment at a water depth of 4 km, 36 m of salt rock was cored from the top of one of a field of salt domes. The core was studied by thin section and a variety of geochemical procedures. The salt rock contains 0.1 to 3% carnallite and lesser amounts of sylvite and polyhalite, which with the corresponding high level of bromide place it within the potash evaporite facies. The bromide profile is of a dominantly marine evaporite deposited in moderately shallow brine which, however, was not repeatedly desiccated. A mineralogical argument suggests that the brine surface was not below sea level. An average of about 5% elastics, with dispersed anhydrite, darken the salt rock to deep shades of red, brown, and gray green. Most of the included materials are in highly deformed boudins or dispersions in the salt rock that has also undergone cataclasis in a subsequent, probably tectonic, deformation. The salt rock is slightly deficient in anhydrite, and the usual separate beds and laminae of anhydrite are virtually absent. Stable isotope ratios of sulfur and oxygen in the sulfate are clearly derived from sea water of Permian to Scythian age, in contrast to the late Triassic or Early Jurassic age of evaporites onshore in Morocco and Portugal and the corresponding evaporites offshore Maritime Canada. In contrast to those evaporites off the axis of Atlantic rifting, the salt at Site 546 may have been deposited in a very early central rift fed by marine waters from Tethys through the Gibraltar or South Atlas fracture zones. |
format |
Other/Unknown Material |
author |
Holser, William T Saltzman, Eric S Brookins, Douglas G |
author_facet |
Holser, William T Saltzman, Eric S Brookins, Douglas G |
author_sort |
Holser, William T |
title |
Geochemistry and isotopes at DSDP Hole 79-546 |
title_short |
Geochemistry and isotopes at DSDP Hole 79-546 |
title_full |
Geochemistry and isotopes at DSDP Hole 79-546 |
title_fullStr |
Geochemistry and isotopes at DSDP Hole 79-546 |
title_full_unstemmed |
Geochemistry and isotopes at DSDP Hole 79-546 |
title_sort |
geochemistry and isotopes at dsdp hole 79-546 |
publisher |
PANGAEA |
publishDate |
1984 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.808523 https://doi.org/10.1594/PANGAEA.808523 |
op_coverage |
LATITUDE: 33.778500 * LONGITUDE: -9.564300 * DATE/TIME START: 1981-05-01T00:00:00 * DATE/TIME END: 1981-05-01T00:00:00 |
long_lat |
ENVELOPE(-9.564300,-9.564300,33.778500,33.778500) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Holser, William T; Saltzman, Eric S; Brookins, Douglas G (1984): Geochemistry and petrology of evaporites cored from a deep-sea diapir at Site 546 offshore Morocco. In: Hinz, K; Winterer, EL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 79, 509-540, https://doi.org/10.2973/dsdp.proc.79.117.1984 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.808523 https://doi.org/10.1594/PANGAEA.808523 |
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.80852310.2973/dsdp.proc.79.117.1984 |
_version_ |
1810464250062176256 |