Relict ooids off northwestern India: Inferences on their genesis and late Quaternary sea level
| Autor: | John D. Milliman, V. Purnachandra Rao |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
geography
Past sea level geography.geographical_feature_category 010504 meteorology & atmospheric sciences δ18O Continental shelf Stratigraphy Geology 010502 geochemistry & geophysics Monsoon 01 natural sciences chemistry.chemical_compound Paleontology chemistry Carbonate Quaternary Holocene Sea level 0105 earth and related environmental sciences |
| Zdroj: | Sedimentary Geology. 358:44-50 |
| ISSN: | 0037-0738 |
| Popis: | Relict carbonate sands dominated by ooids and faecal pellets are common on the continental shelf, between 60 and 110 m, off northwestern India. The shiny tan/white aragonitic ooids closely resemble modern Bahamian ooids, with cortex thicknesses varying from 23 ka BP, and δ18O values suggest that these relict ooids formed during cooler and drier post-LGM conditions and later during the re-intensified Holocene monsoon climate. An age vs. depth plot suggests that most of the ooids formed at water depths between ~ 10 and − 40 m, thereby calling into question whether relict shelf ooids are reliable indicators of past sea level. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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