کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8914921 | 1640750 | 2018 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The giant Mauritanian cold-water coral mound province: Oxygen control on coral mound formation
ترجمه فارسی عنوان
استان خلیج مرجانی سرد آب موریتانی غول پیکر: کنترل اکسیژن در شکل گیری گودال مرجانی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
The largest coherent cold-water coral (CWC) mound province in the Atlantic Ocean exists along the Mauritanian margin, where up to 100â¯m high mounds extend over a distance of â¼400â¯km, arranged in two slope-parallel chains in 400-550â¯m water depth. Additionally, CWCs are present in the numerous submarine canyons with isolated coral mounds being developed on some canyon flanks. Seventy-seven Uranium-series coral ages were assessed to elucidate the timing of CWC colonisation and coral mound development along the Mauritanian margin for the last â¼120,000 years. Our results show that CWCs were present on the mounds during the Last Interglacial, though in low numbers corresponding to coral mound aggradation rates of 16â¯cmâ¯kyrâ1. Most prolific periods for CWC growth are identified for the last glacial and deglaciation, resulting in enhanced mound aggradation (>1000â¯cmâ¯kyrâ1), before mound formation stagnated along the entire margin with the onset of the Holocene. Until today, the Mauritanian mounds are in a dormant state with only scarce CWC growth. In the canyons, live CWCs are abundant since the Late Holocene at least. Thus, the canyons may serve as a refuge to CWCs potentially enabling the observed modest re-colonisation pulse on the mounds along the open slope. The timing and rate of the pre-Holocene coral mound aggradation, and the cessation of mound formation varied between the individual mounds, which was likely the consequence of vertical/lateral changes in water mass structure that placed the mounds near or out of oxygen-depleted waters, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 185, 1 April 2018, Pages 135-152
Journal: Quaternary Science Reviews - Volume 185, 1 April 2018, Pages 135-152
نویسندگان
Claudia Wienberg, Jürgen Titschack, André Freiwald, Norbert Frank, Tomas Lundälv, Marco Taviani, Lydia Beuck, Andrea Schröder-Ritzrau, Thomas Krengel, Dierk Hebbeln,