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http://dx.doi.org/10.9727/jmsk.2017.30.3.93

Characteristics of Heavy Minerals in the South East Yellow Sea Mud (SEYSM) and South West Cheju Island Mud (SWCIM)  

Koo, Hyo Jin (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Cho, Hyen Goo (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Lee, Bu Yeong (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Yi, Hi Il (Marine Geology and Geophysics, Korea Institute of Ocean Science and Technology)
Publication Information
Journal of the Mineralogical Society of Korea / v.30, no.3, 2017 , pp. 93-102 More about this Journal
Abstract
Heavy mineral provide an important information for sediment provenance as well as a potential submarine mineral resources. We compared the heavy mineral characteristics between Southeastern Yellow Sea Mud (SEYSM) and Southwestern Cheju Island Mud (SWCIM) surface sediments. We separated heavy minerals from 28 surface sediments in each mudbelt, and then carried out stereo-microscopic, field-emission scanning electron microscopic, energy dispersive spectroscopic and electron probe microanalysis to characterize the type, abundance, mineralogical properties and distribution pattern of heavy mineral. Amphibole and epidote, which are two major heavy minerals, account for more than 70% of total heavy minerals. Zircon and sphene contents are more abundant in SEYSM, whereas apatite and rutile contents are more abundant in SWCIM. Monazite only occurs in some area of SEYSM. Sphene and monazite content decrease to the south in SEYSM. Both garnet-zircon index (GZi) and rutile-zircon index (RuZi) are low in SEYSM but high in SWCIM. Amphiboles in SEYSM primarily correspond to hornblende, however those in SWCIM represent variable composition from pargasite, tshermakite, hornblende to tremolite. Garnets in SEYSM have high Mg and low Ca, but those in SWCIM have low Mg with variable Ca. Different heavy mineral characteristics between SEYSM and SWCIM suggests that sediments in each mudbelt have different provenances. Although this study implies that SEYSM sediment may mostly come from nearby Korean western rivers such as the Keum and Han rivers, this study does not suggest any idea of the source area of SWCIM sediment. Further study is needed to interpret the provenance and transportation mechanism of mudbelt sediments through the heavy mineral research for the river sediments flowing into the Yellow Sea and much more marine sediments.
Keywords
Southeastern Yellow Sea Mud (SEYSM); Southwestern Cheju Island Mud (SWCIM); heavy mineral; epidote; amphibole; garnet; monazite; mineral chemistry;
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