(Table 1) Heavy-mineral analyses for DSDP Leg 67 Holes from electron microprobe


Autoria(s): Prasad, Sachindra; Hesse, Reinhard
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

Data(s)

26/07/1982

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