Investigations on volcanic rocks in sediment core CRP-3 from the Ross Sea, Antarctica
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2001
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| _version_ | 1867170452829372416 |
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| author | Pompilio, Massimo Armienti, Pietro Tamponi, M |
| author_facet | Pompilio, Massimo Armienti, Pietro Tamponi, M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The petrography, mineralogy and geochemistry of volcanic and subvolcanic rocks in CRP-3 core have been examined in detail in order to characterise and to compare them with volcanic and subvolcanic rocks cropping out in the Victoria Land area, and to define the clast provenance or to establish possible volcanic activity coeval with deposition. Clasts with sizes ranging from granule to boulder show geochemical and mineralogical features comparable with those of Ferrar Supergroup rocks. They display a subalkaline affinity and compositions ranging from basalts to dacite. Three different petrographic groups with distinct textural and grain size features (subophitic, intergranular-intersertal, and glassy-hyalopilitic) are recognised and are related to the emplacement/cooling mechanism. In the sand to silt fraction, the few glass shards that have been recognised are strongly altered: however chemical analyses show they have subalkalic magmatic affinity. Mineral compositions of the abundant free clinopyroxene grains found in the core, are less affected by alteration processes, and indicate an origin from subalkaline magmas. This excludes the presence, during the deposition of CRP-3 rocks of alkaline volcanic activity comparable with the McMurdo Volcanic Group. Strong alteration of the magmatic body intruded the Beacon sandstones obliterates the original mineral assemblage. Geochemical investigations confirm that intrusion is part of the Ferar Large Igneous Province. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_510770 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Investigations on volcanic rocks in sediment core CRP-3 from the Ross Sea, Antarctica Pompilio, Massimo Armienti, Pietro Tamponi, M Cape Roberts Project; Core wireline system; CRP; CRP-3; CRP-3__Campaign; CWS; Ross Sea; Sampling/drilling from ice The petrography, mineralogy and geochemistry of volcanic and subvolcanic rocks in CRP-3 core have been examined in detail in order to characterise and to compare them with volcanic and subvolcanic rocks cropping out in the Victoria Land area, and to define the clast provenance or to establish possible volcanic activity coeval with deposition. Clasts with sizes ranging from granule to boulder show geochemical and mineralogical features comparable with those of Ferrar Supergroup rocks. They display a subalkaline affinity and compositions ranging from basalts to dacite. Three different petrographic groups with distinct textural and grain size features (subophitic, intergranular-intersertal, and glassy-hyalopilitic) are recognised and are related to the emplacement/cooling mechanism. In the sand to silt fraction, the few glass shards that have been recognised are strongly altered: however chemical analyses show they have subalkalic magmatic affinity. Mineral compositions of the abundant free clinopyroxene grains found in the core, are less affected by alteration processes, and indicate an origin from subalkaline magmas. This excludes the presence, during the deposition of CRP-3 rocks of alkaline volcanic activity comparable with the McMurdo Volcanic Group. Strong alteration of the magmatic body intruded the Beacon sandstones obliterates the original mineral assemblage. Geochemical investigations confirm that intrusion is part of the Ferar Large Igneous Province. |
| title | Investigations on volcanic rocks in sediment core CRP-3 from the Ross Sea, Antarctica |
| topic | Cape Roberts Project; Core wireline system; CRP; CRP-3; CRP-3__Campaign; CWS; Ross Sea; Sampling/drilling from ice |
| url | https://doi.org/10.1594/PANGAEA.510770 |