Evidence for the episodic "turn on" and "turn off" of turbid-zone coral reefs during the late Holocene sea-level highstand

Evidence for the episodic "turn on" and "turn off" of turbid-zone coral reefs during the late Holocene sea-level highstand
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全新世晚期海平面高位期间浑浊带珊瑚礁间歇性“开启”和“关闭”的证据

DOI:
10.1130/g30444.1
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发表时间:
2010
期刊:
影响因子:
5.8
通讯作者:
Perry C
Perry C
中科院分区:
地球科学1区
文献类型:
--
作者:
Perry C

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近岸海洋环境中的陆源沉积物积累被认为是抑制碳酸盐生成和珊瑚礁增生的主要因素。虽然最近的生态和地质研究珊瑚礁发展的长期陆源沉积物的影响问题过于简单的性质,这种观点,了解珊瑚礁的形成和生长的时间尺度和珊瑚礁增生的形态动力学在这些设置仍然有限。在这里,我们提出的证据来支持最近的建议,一旦建立,快速的珊瑚礁增生和dedation是可能的,但这种珊瑚礁发展的有限的住宿窗口往往会导致短暂的(短暂的)阶段的珊瑚礁建设。具体而言,我们描述了两个离散的时期内的一个小(10600米宽)的海岸海湾周围的高岛的陆源沉积物为主的内大陆架的大堡礁,澳大利亚。这些造礁阶段发生在全新世海平面高位的两端,第一个阶段发生在冰后期海侵和早期高位(6900-4500校准(cal)yr B. P.),第二次是在全新世晚期海退和停滞之后(距今1600 cal yr)。一个3000年的间隙发生在这些事件之间,可能是作为一个功能的微妙变化,海平面和相关的海岸线形态动力学。
Terrigenous sediment accumulation within nearshore marine environments is regarded as a major factor inhibiting carbonate production and coral reef accretion. While recent ecological and geological research into reef development under long-term terrigenous sediment influence questions the overly simplistic nature of such views, understanding of the time scales of reef initiation and growth and the morphodynamics of reef accretion in these settings remains limited. Here we present evidence to support recent suggestions that, once established, rapid reef accretion and progradation is possible, but that the restricted accommodation windows in which such reefs develop often result in short-lived (ephemeral) phases of reef building. Specifically, we describe two discrete periods of reef growth within one small (∼600 m wide) coastal embayment around a high island on the terrigenous sediment–dominated inner shelf of the central Great Barrier Reef, Australia. These reef-building phases occurred at either end of the Holocene sea-level highstand, the first during the late postglacial marine transgression and early highstand (∼6900–4500 calibrated (cal) yr B.P.), the second following the late Holocene regression and stillstand (∼1600 cal yr B.P. to present). An ∼3000 yr hiatus occurred between these events, probably as a function of subtle changes in sea level and associated shoreline morphodynamics.
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影响因子: 2.8
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DOI: --
发表时间: 1983
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