Geochemistry of abyssal oceanic magmas
Massive, nearly holocrystalline dolerites from DSDP Hole 417D contain from 0.5 to 1.5% of granophyric patches composed mainly of Na-plagioclase and quartz. These patches are compositionally similar to other crystalline silicic rocks from oceanic spreading centers and differ from rarer abyssal silici...
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1980
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.715067 2023-05-15T17:33:42+02:00 Geochemistry of abyssal oceanic magmas Sinton, John M Byerly, Gary R LATITUDE: 25.111500 * LONGITUDE: -68.046800 * DATE/TIME START: 1976-12-02T00:00:00 * DATE/TIME END: 1976-12-30T00:00:00 1980-05-15 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.715067 https://doi.org/10.1594/PANGAEA.715067 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.715067 https://doi.org/10.1594/PANGAEA.715067 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Sinton, John M; Byerly, Gary R (1980): Silicic differentiates of abyssal oceanic magmas: Evidence for late-magmatic vapor transport of potassium. Earth and Planetary Science Letters, 47(3), 423-430, https://doi.org/10.1016/0012-821X(80)90030-8 51-417D 52-417D Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg51 Leg52 North Atlantic/CONT RISE Dataset 1980 ftpangaea https://doi.org/10.1594/PANGAEA.715067 https://doi.org/10.1016/0012-821X(80)90030-8 2023-01-20T07:31:24Z Massive, nearly holocrystalline dolerites from DSDP Hole 417D contain from 0.5 to 1.5% of granophyric patches composed mainly of Na-plagioclase and quartz. These patches are compositionally similar to other crystalline silicic rocks from oceanic spreading centers and differ from rarer abyssal silicic glasses. Crystalline varieties with SiO2 > 60 wt.% generally have Na/K >10, whereas silicic glasses have Na/K in the range 3-6. While crystal fractionation readily accounts for the Na2O and K2O contents of abyssal silicic glasses, both the 417D granophyres and other crystalline abyssal silicic rocks have much lower K2O than that predicted by any reasonable crystal-liquid fractionation model. We propose that high-temperature vapor phase transport is responsible for removal of potassium during late-stage crystallization of these rocks. This allows for the formation of cogenetic silicic glassy and crystalline rocks with greatly different Na/K ratios. These observations and interpretations lead to a more confident assignment of high Na/K silicic rocks of oceanic and ophiolitic environments to a cogenetic origin with basaltic oceanic crust. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-68.046800,-68.046800,25.111500,25.111500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
51-417D 52-417D Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg51 Leg52 North Atlantic/CONT RISE |
spellingShingle |
51-417D 52-417D Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg51 Leg52 North Atlantic/CONT RISE Sinton, John M Byerly, Gary R Geochemistry of abyssal oceanic magmas |
topic_facet |
51-417D 52-417D Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg51 Leg52 North Atlantic/CONT RISE |
description |
Massive, nearly holocrystalline dolerites from DSDP Hole 417D contain from 0.5 to 1.5% of granophyric patches composed mainly of Na-plagioclase and quartz. These patches are compositionally similar to other crystalline silicic rocks from oceanic spreading centers and differ from rarer abyssal silicic glasses. Crystalline varieties with SiO2 > 60 wt.% generally have Na/K >10, whereas silicic glasses have Na/K in the range 3-6. While crystal fractionation readily accounts for the Na2O and K2O contents of abyssal silicic glasses, both the 417D granophyres and other crystalline abyssal silicic rocks have much lower K2O than that predicted by any reasonable crystal-liquid fractionation model. We propose that high-temperature vapor phase transport is responsible for removal of potassium during late-stage crystallization of these rocks. This allows for the formation of cogenetic silicic glassy and crystalline rocks with greatly different Na/K ratios. These observations and interpretations lead to a more confident assignment of high Na/K silicic rocks of oceanic and ophiolitic environments to a cogenetic origin with basaltic oceanic crust. |
format |
Dataset |
author |
Sinton, John M Byerly, Gary R |
author_facet |
Sinton, John M Byerly, Gary R |
author_sort |
Sinton, John M |
title |
Geochemistry of abyssal oceanic magmas |
title_short |
Geochemistry of abyssal oceanic magmas |
title_full |
Geochemistry of abyssal oceanic magmas |
title_fullStr |
Geochemistry of abyssal oceanic magmas |
title_full_unstemmed |
Geochemistry of abyssal oceanic magmas |
title_sort |
geochemistry of abyssal oceanic magmas |
publisher |
PANGAEA |
publishDate |
1980 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.715067 https://doi.org/10.1594/PANGAEA.715067 |
op_coverage |
LATITUDE: 25.111500 * LONGITUDE: -68.046800 * DATE/TIME START: 1976-12-02T00:00:00 * DATE/TIME END: 1976-12-30T00:00:00 |
long_lat |
ENVELOPE(-68.046800,-68.046800,25.111500,25.111500) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Sinton, John M; Byerly, Gary R (1980): Silicic differentiates of abyssal oceanic magmas: Evidence for late-magmatic vapor transport of potassium. Earth and Planetary Science Letters, 47(3), 423-430, https://doi.org/10.1016/0012-821X(80)90030-8 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.715067 https://doi.org/10.1594/PANGAEA.715067 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.715067 https://doi.org/10.1016/0012-821X(80)90030-8 |
_version_ |
1766132291747184640 |