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Lagoonal facies, ages, and sedimentation in three atolls in the Pacific

机译：太平洋三个环礁的泻湖相，年龄和沉积

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摘要

In order to investigate Pacific atoll lagoonal facies and temporal evolution, we collected and analyzed surface and core sediments from three Pacific atoll lagoons of various sizes and depths (Kayangel of Palau Islands, Enewetak and Majuro of the Marshall Islands). The lagoons were divided into three facies: Calcarina facies, Calcarina-Heterostegina mixed facies and Heterostegina facies. These were based on the presence or absence of the tests of two larger benthic foraminifera, Calcarina and Heterostegina, as indicators of reef flat and deep lagoon environments, respectively. The Calcarina facies is composed of allochthonous reef-derived materials, the Calcarina-Heterostegina mixed facies is a mixture of reef-derived and in situ lagoonal materials, and the Heterostegina facies is composed mainly of in situ lagoonal materials, As both foraminifera are widely distributed in the Western to Central Pacific region, the facies classification presented in this study can be applicable to other Pacific atolls. Based on the results of radiocarbon dating on samples obtained from cores at Majuro lagoon, the accumulation rates of the lagoonal sediments were estimated as 0.65 m kyr~(-1). Calcium carbonate production was calculated on the basis of the accumulation rates and density of sediments to be 710 g CaCO_3 m~(-2) yr~(-1).
机译：为了调查太平洋环礁泻湖相和时间演变，我们收集并分析了三个不同大小和深度的太平洋环礁泻湖（帕劳群岛的卡扬格尔，埃纽韦塔克和马绍尔群岛的马朱罗）的表层和核心沉积物。泻湖被分为三个相：卡尔卡里纳相，卡尔卡里纳-海藻类混合相和杂藻类相。这些是根据是否存在两种较大的底栖有孔虫（卡尔卡里纳（Carcarina）和异头藻）（Heterostegina）进行的测试，分别作为礁石平坦和深泻湖环境的指标。卡尔卡里纳岩相由异质礁来源的物质组成，卡尔卡里纳-海藻石混合相是礁石和原位泻湖物质的混合物，杂藻纲相主要由原位泻湖物质组成，因为这两种有孔虫都分布广泛在西太平洋到中太平洋地区，本研究提出的相分类可适​​用于其他太平洋环礁。根据Majuro泻湖岩心样品的放射性碳测年结果，泻湖沉积物的累积速率估计为0.65 m kyr〜（-1）。根据沉积物的堆积速率和密度计算出碳酸钙的产量为710 g CaCO_3 m〜（-2）yr〜（-1）。

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