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首页> 外文期刊>Journal of Sedimentary Research >Sediments, Facies Tracts, and Variations in Sedimentation Rates of Holocene Platform Carbonate Sediments and Associated Deposits, Northern Belize-Implications for 'Representative' Sedimentation Rates
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Sediments, Facies Tracts, and Variations in Sedimentation Rates of Holocene Platform Carbonate Sediments and Associated Deposits, Northern Belize-Implications for 'Representative' Sedimentation Rates

机译：全新世平台碳酸盐岩沉积物和相关沉积物的沉积物，相线和沉积率的变化，北伯利兹-对“代表性”沉积率的影响

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In stratigraphic analysis and simulation, sedimentation rates are typically assumed to be constant for meter-scale sedimentation units of similar lithology. The rates of Holocene, shallow-marine carbonate and associated sediments within an 820 km2 area of Chetumal Bay in northern Belize were evaluated to test this assumption. Rates were determined from thickness data from 363 locations, durations derived from 14C age dates of mangrove peat on Pleistocene bedrock limestone and of overlying cerithid gravels, and reference to a sea-level curve for this area. The rate of entire Holocene sections (basal transgressive mangrove peat, shelly gravel, and overlying carbonate) varies from 0 to 118 cm/ky and averages 32 ± 26 cm/ky. Rates are the highest at two thick mud-mound depocenters (41 ± 27 cm/ky) and considerably lower elsewhere (16 ± 16 cm/ky). In general, sedimentation rate correlates positively with depth of bedrock below sea level. Basal mangrove peats beneath the mud mounds have the highest rates (214-938 cm/ky), whereas overlying to laterally correlative transgressive shelly gravels have the lowest rates (20-48 cm/ky). Rates of combined transgressive and earliest-highstand carbonates, the latter deposited in a catch-up mode, are 112-166 cm/ky, and rates of overlying youngest highstand carbonates deposited in a keep-up mode are 242-460 cm/ky. Sediment thickness may correlate positively with duration but does not correlate with sedimentation rate. A power-law relationship between sedimentation rate and duration (R2 = 0.63, 30 data points) is related to the completeness of the Holocene record.
机译：在地层分析和模拟中，对于相似岩性的米级沉积 单元，通常假定沉积速率 是恒定的。在伯利兹北部切图马尔湾820 km 2 区域内，对全新世，浅海碳酸盐岩和相关沉积物的比率进行了评估 假设。速率是根据363 位置的厚度数据确定的，持续时间是根据更新世基岩石灰石上的红树林 豌豆的 14 C年龄数据得出的，以及上覆的cerethid < sup> 碎石，并参考该区域的海平面曲线。整个全新世部分（基层海侵红树林 豌豆，带壳的砾石和上覆碳酸盐）的 速率从0 到118 cm / ky，且取平均值32±26厘米/ ky。在两个较厚的泥丘沉积中心（41±27 cm / ky）， 最高，而在其他地方（16±16 cm / ky），比率最低。在 中，沉积速率与海平面以下的基岩深度 成正相关。 泥丘下面的基层红树林泥炭具有最高的比率（214-938 cm / ky），而横向相关的海生碎屑砾石上的 上覆的 最低比率（20-48厘米/ ky）。侵袭性 碳酸盐与最早的高架碳酸盐（后者以追赶模式沉积）的速率为112-166 cm / ky，上覆最年轻的碳酸盐保持模式下沉积的高碳酸盐碳酸盐为242-460 cm / ky。沉积物厚度可能与持续时间 正相关，但与沉积速率不相关。沉积速率与持续时间之间的幂律 关系（R 2 = 0.63， 30个数据点）与全新世的完整性< sup> 记录。

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    《Journal of Sedimentary Research》 |2004年第4期|00000498-00000512|共15页
  • 作者

    Wan Yang; S.J. Mazzullo; Chellie S. Teal;

  • 作者单位

    Department of Geology, Wichita State University, Wichita, Kansas 67260, U.S.A.wan.yang@wichita.edu;

    Department of Geology, Wichita State University, Wichita, Kansas 67260, U.S.A.;

    Department of Geology, Wichita State University, Wichita, Kansas 67260, U.S.A.;

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