(Table 1) Heavy-mineral analyses for DSDP Leg 67 Holes from electron microprobe
Cobertura |
MEDIAN LATITUDE: 12.701000 * MEDIAN LONGITUDE: -90.933520 * SOUTH-BOUND LATITUDE: 12.671000 * WEST-BOUND LONGITUDE: -90.944800 * NORTH-BOUND LATITUDE: 12.716800 * EAST-BOUND LONGITUDE: -90.915700 * DATE/TIME START: 1979-05-17T00:00:00 * DATE/TIME END: 1979-06-18T00:00:00 * MINIMUM ELEVATION: -6105.0 m * MAXIMUM ELEVATION: -5472.0 m |
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Data(s) |
26/07/1982
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Resumo |
Heavy and light minerals were examined in 29 samples from Sites 494, 498, 499, 500, and 495 on the Deep Sea Drilling Project Leg 67 Middle America Trench transect; these sites represent lower slope, trench, and oceanic crust environments off Guatemala. All samples are Quaternary except those from Hole 494A (Pliocene) and Hole 498A (Miocene). Heavy-mineral assemblages of the Quaternary sediments are characterized by an immature pyroxene-amphibole suite with small quantities of olivine and epidote. The Miocene sediments yielded an assemblage dominated by epidote and pyroxene but lacking olivine; the absence of olivine is attributed to selective removal of the most unstable components by intrastratal solution. Light-mineral assemblages of all samples are predominantly characterized by volcanic glass and plagioclase feldspar. The feldspar compositions are compatible with andesitic source rocks and frequently exhibit oscillatory zoning. The heavy- and light-mineral associations of these sediments suggest a proximal volcanic source, most probably the Neogene highland volcanic province of Guatemala. Sand-sized components from Site 495 are mainly biogenic skeletons and volcanic glass and, in one instance (Section 495-5-3), euhedral crystals of gypsum. |
Formato |
text/tab-separated-values, 425 data points |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.817250 doi:10.1594/PANGAEA.817250 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
doi:10.1594/PANGAEA.817253 Prasad, Sachindra; Hesse, Reinhard (1982): Provenance of detrital sediments from the Middle America Trench transect off Guatemala, Deep Sea Drilling Project Leg 67. In: Abouin, J; von Huene, R; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 67, 507-514, doi:10.2973/dsdp.proc.67.118.1982 |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Palavras-Chave | #67-494; 67-494A; 67-498A; 67-499; 67-500; Amphibole; Apatite; Clinopyroxene; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Electron microprobe; Elevation of event; Epidote; Epoch; Event label; Glomar Challenger; Heavy mineral grains; Latitude of event; Leg67; Longitude of event; North Pacific/TRENCH; ODP sample designation; Olivine; Orthopyroxene; Rutile; Sample code/label; Sphene |
Tipo |
Dataset |