气候变化领域集成服务门户(CCPortal): Formation of coast-parallel heavy mineral enrichments investigated by exploratory numerical modelling

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DOI	10.1130/B31995.1
	Formation of coast-parallel heavy mineral enrichments investigated by exploratory numerical modelling
	Kulgemeyer T.; Bryan K.R.; von Dobeneck T.
发表日期	2018
ISSN	167606
起始页码	1875
结束页码	1888
卷号	130 期号:2021-11-12
英文摘要	We used a numerical model to investigate the formation processes of coast-parallel magnetite enrichments observed in the western Bay of Plenty, New Zealand. The model simulates differential transport of two separate grain fractions with different sizes and densities on an inclined surface, using the average hydrodynamic and geological conditions of the study area as input. In the observed and modeled structures, magnetite concentrations increase coastwards from the depth where quartz grains are first entrained until the critical shear stress of magnetite is surpassed. Beyond this point, the concentration decreases. The dominant process for structure formation is grain-size-selective entrainment. The degree of enrichment is further controlled by differential transport of the fractions. Additional tests show the influence of hydrodynamic (wave height and period, current velocities) and geological parameters (grain size and density, bed slope). Parameters that change the bed shear stress shift the enrichment into deeper or shallower water depths. The model shows the importance of cross-shelf sediment transport for effective enrichment, demonstrates the mechanisms for the formation of this type of structure, and should be able to predict the location of enrichment zones in other coastal environments for a variety of heavy minerals. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184984
作者单位	Faculty of Geosciences and Center for Marine Environmental Sciences (MARUM), University of Bremen, Klagenfurter Straße, Bremen, 28359, Germany; School of Science, University of Waikato, Private Bag 3105, Hamilton, New Zealand
推荐引用方式 GB/T 7714	Kulgemeyer T.,Bryan K.R.,von Dobeneck T.. Formation of coast-parallel heavy mineral enrichments investigated by exploratory numerical modelling[J],2018,130(2021-11-12).
APA	Kulgemeyer T.,Bryan K.R.,&von Dobeneck T..(2018).Formation of coast-parallel heavy mineral enrichments investigated by exploratory numerical modelling.Bulletin of the Geological Society of America,130(2021-11-12).
MLA	Kulgemeyer T.,et al."Formation of coast-parallel heavy mineral enrichments investigated by exploratory numerical modelling".Bulletin of the Geological Society of America 130.2021-11-12(2018).