Coral growth rates from the Holocene Cañada Honda fossil reef, Southwestern Dominican Republic: Comparisons with modern counterparts in high sedimentation settings
Coral growth rates from the Holocene Cañada Honda fossil reef, Southwestern Dominican Republic: Comparisons with modern counterparts in high sedimentation settings
复制标题
多米尼加共和国西南部全新世加拿大本田化石礁的珊瑚生长率：与高沉积环境中现代单位的比较
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
D. Hubbard
中科院分区：
文献类型：
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作者：
D. Cuevas;C. Sherman;W. Ramírez;D. Hubbard
抽象的。
全新世加拿大本田化石礁位于多米尼加共和国西南部，提供了一个独特的机会来研究保存完好的化石珊瑚礁，该珊瑚礁在 9,000 至 5,000 年前的高沉积环境中繁衍生息。对 Montastraea faveolata 和 Siderastrea siderea 珊瑚的生长速率进行了测量，并与整个加勒比海现代珊瑚礁中这些相同物种的生长速率数据进行了比较。此外，还对珊瑚物种丰度、形态、年龄和分布以及珊瑚礁沉积物成分进行了评估，以确定珊瑚礁增生的古环境。该珊瑚礁的特点是耐沉积物珊瑚物种相对丰富，这些珊瑚物种倾向于形成几乎单一物种的群落。单个菌落倾向于生长为结壳、圆顶状、板状形式，而 Montastraea faveolata 的标本通常含有融入骨骼的沉积物带。珊瑚化石的校准放射性碳年龄范围为 9,256±137 BP 至 6,737±94.5 BP。放射性碳年龄与已确定的全新世海平面曲线的相关性表明，该珊瑚礁上的大多数珊瑚是在> 15 m的深度发育的。与现代珊瑚礁地点的生长率相比，Siderastrea siderea（0.2-0.4 cm/年）和 Montastraea faveolata（0.09-0.44 cm/年）测量的生长率相对较低，表明深度大于 15 m 的珊瑚生长导致光照强度降低。珊瑚礁沉积物的特点是碳酸盐物质超过 85%。碳酸盐岩的很大一部分是异源的，源自附近的新近纪石灰岩。珊瑚礁能够在高沉积条件下生存，因为传入的陆源沉积物的高碳酸盐含量将允许更好的光线穿透，并且可能的零星风暴将提供中间的低沉积期，在此期间珊瑚礁可以做出反应并重新生长，跟上沉积的步伐。
Abstract.
The Holocene Cañada Honda fossil reef, located in southwestern Dominican Republic, provides a unique opportunity to examine a well-preserved fossil coral reef that thrived in a high-sedimentation environment between 9,000 to 5,000 years ago. Measurements of coral growth rates from the corals Montastraea faveolata and Siderastrea siderea were conducted and comparisons made with growth rate data of these same species from modern coral reefs throughout the Caribbean. Also, assessments of coral species abundance, morphology, age, and distribution, as well as reef sediment composition, were made to determine the paleoenvironment of reef accretion. This reef is characterized by a high relative abundance of sediment-tolerant coral species that have a tendency to form almost monospecific stands. Individual colonies have a propensity to grow as encrusting, dome-shaped, platy-like forms and specimens of Montastraea faveolata commonly contain bands of sediment incorporated into the skeleton. Calibrated radiocarbon ages of fossil corals range from 9,256±137 to 6,737±94.5 BP. Correlation of radiocarbon ages with well-established Holocene sea-level curves indicates that most corals on this reef developed at depths >15m. Measured growth rates in Siderastrea siderea (0.2–0.4 cm/yr) and Montastraea faveolata (0.09–0.44 cm/yr) are relatively low compared with growth rates from modern reef sites, indicating reduced light intensity caused by coral growth at depths greater than 15 m. Reef sediment is characterized by more than 85% carbonate material. A significant portion of the carbonate is allochtonous and was derived from nearby Neogene limestones. The reef was able to survive under high-sedimentation conditions because the high carbonate content of incoming terrigenous sediment would have allowed better light penetration and probable sporadic storms would provide intervening low-sedimentation periods during which reef corals could respond and grow back, keeping-up with sedimentation.