Phaeodarian radiolarians as indicators of recent and past (Monterey) anoxic environments
Tests of phaeodarian radiolarians are composed largely of organic matter, containing only a small percentage of opaline silica in their matrix. Because of their highly organic nature, these tests are generally dissolved prior to deposition at the sediment-water interfaces of oxic environments. Anoxic environments, however, offer settings of little bioturbation and low oxygenation and may enhance phaeodarian preservation in the sediment records of anoxic locations. Recent southern California continental borderland surface sediment samples are studied in this research to provide a quantitative index of anoxia using phaeodarian surface area as a criterion. Californian Miocene and Pliocene samples have been compared to verify the index in the fossil record.
- Research Organization:
- Rice Univ., Houston, TX
- OSTI ID:
- 6987553
- Report Number(s):
- CONF-8604187-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 70:4; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
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