Heavy mineral partitioning in sedimentary facies: Lac Baby Esker, Lac Timiskaming region, Canada

Sedimentary Facies and Material Source of Core DGKS9617 in the East China Sea

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.277-279.410 ◽

2005 ◽

Vol 277-279 ◽

pp. 410-417

Author(s):

Hua Yu ◽

Zhen Xia Liu ◽

Ying Qian Xiong ◽

Yoshiki Saito ◽

Kunshan Wang

Keyword(s):

East China Sea ◽

Yangtze River ◽

Sedimentary Facies ◽

Heavy Mineral ◽

East China ◽

The Yangtze River ◽

The East China Sea ◽

Shallow Marine ◽

China Sea ◽

Marine Facies

A piston core DGKS9617, recovered from the northern part of the inner shelf of the East China Sea (ECS) is divided into two sedimentary facies: a tidal shallow marine facies (55-850 cm) and a shallow marine facies (0-55 cm). Although the sedimentary environments of its upper and lower parts are different, the provenance of the whole core does not change. The heavy mineral assemblage, the results of the discrimination function of Fe, Mn, V, Cr, Ni, Cu and Zn, the carbonate content and the Ba-Sr-Zn ternary diagram consistently show that the heavy mineral and geochemical characteristics of core DGKS9617 are similar to that of the Yangtze River sediments and that its sediment is mainly provided by the Yangtze River.

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Benthic foraminiferal zonation in deep-water carbonate platform margin environments, northern Little Bahama Bank

Journal of Paleontology ◽

10.1017/s0022336000058819 ◽

1988 ◽

Vol 62 (01) ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Ronald E. Martin

Keyword(s):

Deep Water ◽

Benthic Foraminifera ◽

Carbonate Platform ◽

Sedimentary Facies ◽

Depositional Environments ◽

Near Surface ◽

Sediment Gravity Flows ◽

Gravity Flows ◽

Platform Margin ◽

Water Carbonate

The utility of benthic foraminifera in bathymetric interpretation of clastic depositional environments is well established. In contrast, bathymetric distribution of benthic foraminifera in deep-water carbonate environments has been largely neglected. Approximately 260 species and morphotypes of benthic foraminifera were identified from 12 piston core tops and grab samples collected along two traverses 25 km apart across the northern windward margin of Little Bahama Bank at depths of 275-1,135 m. Certain species and operational taxonomic groups of benthic foraminifera correspond to major near-surface sedimentary facies of the windward margin of Little Bahama Bank and serve as reliable depth indicators. Globocassidulina subglobosa, Cibicides rugosus, and Cibicides wuellerstorfi are all reliable depth indicators, being most abundant at depths >1,000 m, and are found in lower slope periplatform aprons, which are primarily comprised of sediment gravity flows. Reef-dwelling peneroplids and soritids (suborder Miliolina) and rotaliines (suborder Rotaliina) are most abundant at depths <300 m, reflecting downslope bottom transport in proximity to bank-margin reefs. Small miliolines, rosalinids, and discorbids are abundant in periplatform ooze at depths <300 m and are winnowed from the carbonate platform. Increased variation in assemblage diversity below 900 m reflects mixing of shallow- and deep-water species by sediment gravity flows.

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