Late Miocene and early Pliocene biosiliceous sedimentation along the California margin
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2002
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| _version_ | 1876451197545611264 |
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| author | John A. Barron |
| author_facet | John A. Barron |
| contents | Late Miocene and early Pliocene biosiliceous sedimentation along the California margin John A. Barron Mitchell Lyle Itaru Koizumi Ciencias de la Tierra opal diatom Miocene Pliocene California Biogenic opal sedimentation is compared between offshore and onshore areas of the Californiamargin during the late middle Miocene, the late Miocene, and the early Pliocene. The recordsfrom offshore ODP Sites 1010 and 1021 have declining opal abundance, with a dramatic three-folddecline at about 11.5 Ma and a second, less pronounced drop occurring at about 7.6 Ma. Thickstratigraphic sections of diatomaceous sediments dated between 11.5 and 10.0 Ma and between7.6 and 6.5 Ma are found onshore in California, whereas coeval intervals in offshore deep sea sitesdisplay relatively low opal percentages. This suggests that during periods of reduced strength in theCalifornia Current, diatom production declined in offshore areas while it increased in more coastalregions. The early Pliocene and early part of the late Pliocene (4.6 to ca. 2.7 Ma) are marked by thenear absence of diatoms in offshore sites, while diatoms are masked by clastic components inonshore sections. Diatom production was greatly reduced along the California margin during thisclimatically warm period of the Pliocene at the same time that production dramatically increased inthe subarctic northwest Pacific, suggesting fractionation of opal to higher latitudes. 2002 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57219303 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.19 |
| format | Artículo científico |
| id | redalyc_57219303 |
| institution | Redalyc |
| language | en |
| publishDate | 2002 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Late Miocene and early Pliocene biosiliceous sedimentation along the California margin John A. Barron Ciencias de la Tierra opal diatom Miocene Pliocene California Late Miocene and early Pliocene biosiliceous sedimentation along the California margin John A. Barron Mitchell Lyle Itaru Koizumi Ciencias de la Tierra opal diatom Miocene Pliocene California Biogenic opal sedimentation is compared between offshore and onshore areas of the Californiamargin during the late middle Miocene, the late Miocene, and the early Pliocene. The recordsfrom offshore ODP Sites 1010 and 1021 have declining opal abundance, with a dramatic three-folddecline at about 11.5 Ma and a second, less pronounced drop occurring at about 7.6 Ma. Thickstratigraphic sections of diatomaceous sediments dated between 11.5 and 10.0 Ma and between7.6 and 6.5 Ma are found onshore in California, whereas coeval intervals in offshore deep sea sitesdisplay relatively low opal percentages. This suggests that during periods of reduced strength in theCalifornia Current, diatom production declined in offshore areas while it increased in more coastalregions. The early Pliocene and early part of the late Pliocene (4.6 to ca. 2.7 Ma) are marked by thenear absence of diatoms in offshore sites, while diatoms are masked by clastic components inonshore sections. Diatom production was greatly reduced along the California margin during thisclimatically warm period of the Pliocene at the same time that production dramatically increased inthe subarctic northwest Pacific, suggesting fractionation of opal to higher latitudes. 2002 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57219303 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.19 |
| title | Late Miocene and early Pliocene biosiliceous sedimentation along the California margin |
| topic | Ciencias de la Tierra opal diatom Miocene Pliocene California |
| url | https://www.redalyc.org/articulo.oa?id=57219303 |