کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4751138 1642562 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mid- to Late Holocene organic-walled dinoflagellate cysts from the northern Argentine shelf
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فسیل شناسی
پیش نمایش صفحه اول مقاله
Mid- to Late Holocene organic-walled dinoflagellate cysts from the northern Argentine shelf
چکیده انگلیسی
A Mid- to Late Holocene dinocyst record from the northern inner shelf of Argentina is described. It is analyzed with respect to the distribution of modern dinocysts, other Holocene records from the Buenos Aires province and the biogeographic distribution of planktonic dinocysts and their motile equivalents. Between ca. 5360 and 3300 14C yr BP the low diversity and abundance of the cyst assemblages can be related to a restricted littoral‑subtidal environments. After ca. 3300 14C yr BP a major change is characterized by an increase in dinocyst abundance, indicating a normal inner neritic environment. The dominance of Operculodindium centrocarpum at some levels suggests some influence of continental shelf waters whereas the higher abundances of dinocysts from heterotrophic taxa e.g. Protoperidinium stellatum, Votadinium calvum, V. spinosum in other levels reflects a more inshore-coastal water influence with increased nutrient availability. Both assemblages are consistent with the present day transitional coastal-neritic conditions, suggesting that they were established after ca. 3300 14C yr. These inferences supplement those based on other proxies, reflecting sea-level decrease and the coastal geomorphological evolution post ca. 5360 14C yr BP.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Review of Palaeobotany and Palynology - Volume 152, Issues 1–2, October 2008, Pages 11-20
نویسندگان
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