科研之友
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摘要
Sediments from Kalpakkam in the southeast coast of India were analyzed to characterize heavy mineral distribution. The mineral deposits are fine-grained in nature, and temporal and spatial variations are observed in mineral deposits. Iron mineral peaks observed indicate that hematite is present in the samples. The abundance of iron-based minerals explains the occurrence of black grains in the beaches of Sadras and Kokillamedu. In the rest of the region, the mineral distribution is found to be poor and patchy. Uranium-based radioactive minerals are present in the study area, viz., Uranmicrolite, Dessauite, Dumontite, and Sedovite. The common light minerals are quartz and caminite and the heavy minerals that are not iron-rich are tungusite, charoite, glagolevite, mangazeite, falkmanite, augelite, and struvite. Heavy minerals concentrated in the intertidal tide zone show well-developed swash marks by their typical alignment during the process of swash and backwash. Caminite is formed due to the reaction of seawater with hydrothermal fluids in a midoceanic ridge; its presence in the beach indicates the extent of onshore-offshore sediment transport. The heavy mineral distribution pattern along the Kalpakkam-Mahabalipuram stretch reveals the influence of energy conditions and energy fluctuations that are capable of transporting high-density minerals.
- 出版日期2015-11-2
