The Belize margin revisited: 1. Holocene marine facies
The Belize margin revisited: 1. Holocene marine facies
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重温伯利兹边缘：1.全新世海相
DOI：
10.1007/s00531-003-0324-0
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发表时间：
2003
影响因子：
2.3
通讯作者：
E. Gischler
中科院分区：
文献类型：
--
作者：
E. G. Purdy;E. Gischler
伯利兹最著名的是其260公里长的堡礁和相关的泻湖礁浅滩，但也显示出从近岸硅质碎屑岩到跨越狭窄的陆架泻湖的纯碳酸盐沉积的完全过渡，此外，还有加勒比环礁中为数不多的三个。出版的全新世相关系的伯利兹大陆架已半定量，因为它们是基于定量点计数薄节数据在北方大陆架泻湖和定性估计薄节组成的南部大陆架泻湖。这种对比已经纠正点计数南部陆架泻湖薄部分，并将结果与公布的点计数数据从北方货架，补充额外的信息，以产生一个修改后的因素分析相分布的整个货架。由此产生的9个相向海延伸，包括以前发表的三个伯利兹岛礁上的沉积物分析，共产生11个相。此外，还绘制了大陆架和环礁上的碳酸盐泥分布图，结果并不意外，在某些地方，分布模式清楚地表明泻湖沉积碳酸盐泥的屏障平台来源。邓纳姆的石灰岩分类术语已被用作描述的基础，使这些关系更有用的那些重建古石灰岩沉积环境。
Belize is best known for its 260-km-long barrier reef and associated lagoon reef shoals, but also exhibits a complete transition from near-shore siliciclastics to pure carbonate deposits across a narrow shelf lagoon and, in addition, has three of the very few occurrences of Caribbean atolls. Published Holocene facies relationships on the Belize shelf have been semi-quantitative in that they are based on quantitative point count thin section data in the northern shelf lagoon and on qualitative estimates of thin section composition in the southern shelf lagoon. This contrast has been rectified by point counting southern shelf lagoon thin sections and incorporating the result with published point count data from the northern shelf, supplemented by additional information, to produce a modified factor analysis facies distribution for the entire shelf. The resulting nine facies are extended seaward to include previously published analysis of sediment on the three Belize off-shelf atolls, resulting in a total of 11 facies. In addition, the carbonate mud distribution has been mapped over both the shelf and atolls with the not unexpected result that, in places, the distribution pattern clearly indicates a barrier platform source of lagoon-deposited carbonate mud. Dunham's limestone classification terminology has been used as a basis for description to make these relationships more useful to those reconstructing ancient limestone depositional environments.