Journal ArticleDOI
Clay Mineral Segregation in the Marine Environment
TLDR
Based on the X-ray diffraction analyses of 150 bottom samples from the area of the Atlantic Ocean influenced by the Amazon River, trends in the clay mineral composition were observed in this article.Abstract:
Based on the X-ray diffraction analyses of 150 bottom samples from the area of the Atlantic Ocean influenced by the Amazon River, trends in the clay mineral composition were observed. For the < 2 micron size fraction of samples from the mouth of the Amazon River for a distance of 1,400 kilometers along the shelf, montmorillonite shows a trend increasing from 27% to 40%, the kaolinite decreases from 36% to 32%, and the 10A mica decreases from 28% to 18%. Chemical alteration of clay minerals accounts for very little of these trends. Differential flocculation is shown not to be an important mechanism probably because of natural organic and metallic coatings which give all the clay minerals similar flocculating properties. The study shows the dominant mechanism responsible for the late ally changing composition of the clay minerals to be the physical sorting of sediment by size.read more
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Palaeoclimatic interprétation of clay minerals in marine deposits : an outlook from the continental origin.
Médard Thiry,Médard Thiry +1 more
TL;DR: In this article, a review of the influence of climate on marine clays in the sedimentary record is presented, focusing mainly on the continental origin of the clay minerals and showing the difficulties of retrospective analysis of the impact of climate change on common marine deposits.
Journal ArticleDOI
Clay mineral distribution in surface sediments of the South Atlantic: sources, transport, and relation to oceanography
TL;DR: In this article, surface samples from abyssal sediments of the South Atlantic, from parts of the equatorial Atlantic, and of the Antarctic Ocean, were investigated for clay content and clay mineral composition.
Journal ArticleDOI
The paleoclimatic interpretation of clay minerals in sediments — a review
TL;DR: In this article, the application of paleoclimatic interpretation to clay minerals from continental and marine sediments is reviewed and the advantages of this method are indicated; however, the limitations imposed on the interpretation of clay minerals in sediments are discussed on the basis of examples.
Journal ArticleDOI
Development of the East Asian monsoon: Mineralogical and sedimentologic records in the northern South China Sea since 20 Ma
TL;DR: In this paper, the past change of the East Asian monsoon since 20 Ma using samples from Ocean Drilling Program (ODP) Site 1146 in the northern South China Sea based on a multi-proxy approach including a monomineralic quartz isolation procedure, identification of clay minerals by X-ray Diffraction (XRD) and grain-size analysis of isolated terrigenous materials.
Journal ArticleDOI
Source-to-sink transport processes of fluvial sediments in the South China Sea
Zhifei Liu,Yulong Zhao,Christophe Colin,Karl Stattegger,Martin G. Wiesner,Chih-An Huh,Yanwei Zhang,Xiajing Li,Penjai Sompongchaiyakul,Chen-Feng You,Chi Yue Huang,James T. Liu,Fernando P. Siringan,Khanh Phon Le,Edlic Sathiamurthy,Wahyoe S. Hantoro,Jianguo Liu,Shouting Tuo,Shaohua Zhao,Shiwen Zhou,Ziding He,Yuchen Wang,Suratta Bunsomboonsakul,Yanli Li +23 more
TL;DR: In this paper, the authors synthesize existing clay mineralogical and geochemical data from similar to 1500 samples from the seafloor and surrounding rivers, deepwater mooring observation results, and high resolution glacial-cyclic clay mineralogy records from six high-quality sediment cores.