Reef response to sea-level and environmental changes during the last deglaciation: Integrated Ocean Drilling Program Expedition 310, Tahiti Sea Level
Reef response to sea-level and environmental changes during the last deglaciation: Integrated Ocean Drilling Program Expedition 310, Tahiti Sea Level
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DOI：
10.1130/g32057.1
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发表时间：
2012-07-01
期刊：
影响因子：
5.8
通讯作者：
Dussouillez, Philippe
中科院分区：
文献类型：
--
作者：
Camoin, Gilbert F.;Seard, Claire;Dussouillez, Philippe
末次冰消期的特征是海平面迅速上升和环境突变。巴巴多斯珊瑚礁的记录表明，这一时期已经被两个短暂的加速融化（融水脉冲，MWP），发生在14.08-13.61 ka和11.4-11.1 ka（日历年之前），叠加在一个平稳和持续的海平面上升。虽然它们的时间，规模甚至存在争议，但这些灾难性的海平面上升被认为引发了不同的珊瑚礁溺水事件。珊瑚礁的海平面和环境变化的反应，在最后一次冰消期的海平面上升在塔希提岛重建的基础上的年代学，沉积学，和古生物学研究的核心钻通过现代forereef斜坡上的残余礁功能在综合大洋钻探计划远征310，通过帕皮提礁以前的核心钻的结果作为补充。生物礁不断增生之间的16和10万年，主要是通过加积过程，在增长率平均为10毫米（-1）。在大溪地的这一时期，珊瑚礁的生长没有停止，即使是暂时的。珊瑚藻组合的组成的变化与珊瑚礁生长速率的突然变化相一致，并表征了向上生长的礁桩对非单调的海平面上升和同时代环境变化的响应。在MWP 1A，16 +/- 2米的幅度在类似于350年的海平面跳跃，引起浅水珊瑚组合的退化，逐渐加深，和初期的珊瑚礁溺水。大溪地礁的记录不支持突然的礁淹没事件的发生与类似于15米的海平面脉冲相一致，并意味着在对应于巴巴多斯MWP 1B的时间间隔内，明显上升40毫米/年（-1）。
The last deglaciation is characterized by a rapid sea-level rise and coeval abrupt environmental changes. The Barbados coral reef record suggests that this period has been punctuated by two brief intervals of accelerated melting (meltwater pulses, MWP), occurring at 14.08-13.61 ka and 11.4-11.1 ka (calendar years before present), that are superimposed on a smooth and continuous rise of sea level. Although their timing, magnitude, and even existence have been debated, those catastrophic sea-level rises are thought to have induced distinct reef drowning events. The reef response to sea-level and environmental changes during the last deglacial sea-level rise at Tahiti is reconstructed based on a chronological, sedimentological, and paleobiological study of cores drilled through the relict reef features on the modern forereef slopes during the Integrated Ocean Drilling Program Expedition 310, complemented by results on previous cores drilled through the Papeete reef. Reefs accreted continuously between 16 and 10 ka, mostly through aggradational processes, at growth rates averaging 10 mm yr(-1). No cessation of reef growth, even temporary, has been evidenced during this period at Tahiti. Changes in the composition of coralgal assemblages coincide with abrupt variations in reef growth rates and characterize the response of the upward-growing reef pile to nonmonotonous sea-level rise and coeval environmental changes. The sea-level jump during MWP 1A, 16 +/- 2 m of magnitude in similar to 350 yr, induced the retrogradation of shallow-water coral assemblages, gradual deepening, and incipient reef drowning. The Tahiti reef record does not support the occurrence of an abrupt reef drowning event coinciding with a sea-level pulse of similar to 15 m, and implies an apparent rise of 40 mm yr(-1) during the time interval corresponding to MWP 1B at Barbados.