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Kiyokawa, Shoichi; Yokoyama, Kazumi (2009): (Table 1) Heavy minerals in silt and sand samples of IODP Site 301-U1301. PANGAEA, https://doi.org/10.1594/PANGAEA.763387, Supplement to: Kiyokawa, S; Yokoyama, K (2009): Provenance of turbidite sands from IODP EXP 1301 in the northwestern Cascadia Basin, western North America. Marine Geology, 260(1-4), 19-29, https://doi.org/10.1016/j.margeo.2009.01.003

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Abstract:
The northwestern Cascadia Basin of western North America accumulated high-sedimentation-rate sequences during the Pleistocene sea-level low-stands. The continental shelf was largely exposed at that time, and rivers and estuaries delivered large sediment fluxes directly to the deep ocean. The IODP EXP1301 core, which was taken from the middle portion of the Cascadia Basin, is well preserved and exhibits the deeper and - more distal sedimentary facies. The lithology in this location is composed of two units, 1) hemipelagic mud with a thin sand layer and 2) thick, coarsening upward silt-sand turbidites with a small proportion of granules at the top. We will focus on the detailed sand-grain proportions in order to understand the origin of these sediments. We determined the modal proportions of the heavy minerals, and the chemical composition of olivine and orthopyroxene in fourteen samples. These are characterized by an abundance of amphibole, pyroxenes and epidote, and the presence of minerals derived from peridotite. There is no drastic change in the modal and mineral compositions of the sands and silts between the turbidite and hemipelagic sequences. There were two probable drainage systems on the continent, the Frazer and Columbia rivers, which shed turbidites into the Cascadia Basin after 1.6 Ma, especially at 0.46-0.76 Ma. Based on a comparison of the modal and mineral compositions, the Northern Cascadia Basin has been supplied with sediments, mainly from the Frazer River, through the Straits of Juan de Fuca, by Pleistocene to Holocene turbidites.
Coverage:
Median Latitude: 47.754630 * Median Longitude: -127.763165 * South-bound Latitude: 47.754600 * West-bound Longitude: -127.763330 * North-bound Latitude: 47.754660 * East-bound Longitude: -127.763000
Minimum Elevation: -2656.0 m * Maximum Elevation: -2656.0 m
Event(s):
301-U1301C * Latitude: 47.754660 * Longitude: -127.763330 * Elevation: -2656.0 m * Recovery: 143.36 m * Location: Juan de Fuca Ridge, North Pacific Ocean * Campaign: Exp301 (Juan de Fuca Hydrogeology) * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 166.8 m cored; 85.9 % recovered; 98.5 m drilled; 265.3 m penetrated
301-U1301D * Latitude: 47.754600 * Longitude: -127.763000 * Recovery: 42.12 m * Campaign: Exp301 (Juan de Fuca Hydrogeology) * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 57 m cored; 73.9 % recovered; 120 m drilled; 177 m penetrated
Comment:
Each numerical value shows a number of grain identified under EDS profile.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelSample labelKiyokawa, ShoichiODP sample designation
3OrthopyroxeneOpx#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
4ClinopyroxeneCpx#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
5AmphiboleAmp#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAXcalcic amphibole
6OlivineOl#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
7GarnetGrt#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAXCa-poor garnet
8Epidote group mineralsEp gr#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
9PumpellyitePmp#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
10TitaniteTtn#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
11IlmeniteIlm#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
12ChromspinelChromspl#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
13MonaziteMnz#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
14CummingtoniteCum#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
15AndraditeAdr#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAXincluding grossular
16Minerals, polymorphMin polym#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAXTiO2 polymorphs
17ZirconZrn#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
18ApatiteAp#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
19TourmalineTur#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
20AllaniteAln#Kiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAX
21Mineral nameMineralKiyokawa, ShoichiEnergy dispersive analysis of x-rays, EDAXothers
Size:
277 data points

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