Vermetid reefs and their use as palaeobathymetric markers: New insights from the Late Miocene of the Mediterranean (Southern Italy, Crete)
Vermetid reefs and their use as palaeobathymetric markers: New insights from the Late Miocene of the Mediterranean (Southern Italy, Crete)
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Vermetid 珊瑚礁及其作为古水深标记的用途：来自地中海晚中新世的新见解（意大利南部、克里特岛）
DOI：
10.1016/j.palaeo.2008.06.008
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Brachert TC
中科院分区：
文献类型：
--
作者：
Vescogni A;Bosellini FR;Reuter M;Kroeger KF;Brachert TC
蠕虫是一个鲜为人知的家庭礁建设腹足动物的特点是一个非常不规则的增长壳。Vermetid礁是已知的从Badenian（中中新世）到今天，其主要的重要性是与它们作为海平面指示器的使用有关，与潮间带或直接的潮下带严格相关。在它们的演化过程中，有两个不同的蠕虫属被认为是造礁者：瓣壳虫是蠕虫礁的主要组成部分，直到全新世，由于仍然未知的原因，它几乎完全被Dendropoma取代。在地中海盆地，Petaloconchus珊瑚礁经常被发现与晚中新世珊瑚生物建造密切相关。在意大利南部萨伦托梅西尼亚礁群斜坡相内新发现的Petaloconchus礁，以及来自克里特岛（希腊）晚托托尼亚-早梅西尼亚礁的新数据，提供了关于这些独特生物构造的古生态学的进一步信息。描述了萨伦托和克里特岛蠕虫礁的地层学和沉积学背景，以及它们的大小、形状和内部结构。通过微相分析确定了生物（蠕虫、蛇虫、苔藓虫和珊瑚藻）和非生物组分（早期海洋胶结物和礁内沉积物），并报告了它们的丰度。这些数据允许从两个不同的沉积环境的蠕虫礁的描述：沿着的货架边缘，并首次在珊瑚礁斜坡。陆架边缘和斜坡Petaloconchus珊瑚礁显示相同的内部结构和组成，但它们的形状不同，由框架的密度，并通过相关的造礁生物（serpulids，苔藓虫和珊瑚藻）的相对比例。关于它们的古水深背景的更多信息是从其他造礁生物群（滨珊瑚和Halimeda绿色藻类）的存在中获得的，这些生物群靠近斜坡蠕虫珊瑚礁，同时还观察到Petaloconchus贝壳的一些解剖特征。结果清楚地表明，Petaloconchus礁的palaeobathymetric范围从上潮下带到30-50米的深度。本研究证实了蠕虫生物礁是恢复古海平面的重要工具，但主要造礁蠕虫的识别仍需引起重视。事实上，虽然大量的现今Dendropoma礁可以与平均海平面，晚中新世蠕虫礁从萨伦托和克里特岛表明Petaloconchus生物建设更广泛的古水深范围。
Vermetids are a poorly known family of reef-building gastropods characterized by an extremely irregular growth of the shell. Vermetid reefs are known from the Badenian (Middle Miocene) to present-day and their main importance is related to their use as sea-level indicators, strictly associated to the intertidal or immediate subtidal zone. During their evolution, two different vermetid genera have been recognized as reef-builders: Petaloconchus was the major component of vermetid reefs until the Holocene when, for still unknown reasons, it was almost completely replaced by Dendropoma. In the Mediterranean Basin, Petaloconchus reefs have been frequently found in close association to Late Miocene coral bioconstructions. New finding of Petaloconchus reefs within the slope facies of the Salento Messinian reef complex (southern Italy), together with new data from late Tortonian–early Messinian reefs of Crete (Greece) provide further information on the palaeoecology of these peculiar bioconstructions. Stratigraphical and sedimentological contexts of Salento and Crete vermetid reefs have been described, together with an account of their size, shape and inner structure. Biotic (vermetids, serpulids, bryozoans and coralline algae) and abiotic components (early marine cements and intra-reef sediment) have been identified by microfacies analysis, and their percentage-abundance has been reported. These data allow the description of vermetid reefs from two different depositional settings: along the shelf edge and, for the first time, within the coral reef slope. Shelf-edge and slope Petaloconchus reefs show the same inner structure and composition, but they differ by their shape, by the density of the framework, and by the relative proportion of the associated reef-building organisms (serpulids, bryozoans and coralline algae). Additional information on their palaeobathymetric setting have been acquired from the presence of other reef-building biota (Porites corals and Halimeda green algae) which occur in close proximity to slope vermetid reefs, together with observations on some anatomical feature of Petaloconchus shells. Results clearly indicate for Petaloconchus reefs a palaeobathymetric range spanning from the upper subtidal zone down to 30–50 m of depth. The present study confirms vermetid reefs as important tools for the reconstructions of ancient sea-level, but great attention has to be paid to the identification of the main reef-building vermetid. Actually, while a great number of present-day Dendropoma reefs can be associated to the mean sea-level, Late Miocene vermetid reefs from Salento and Crete indicate for Petaloconchus bioconstructions a wider palaeobathymetric range.
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影响因子：
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作者：
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DOI：
--
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2007
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期刊：
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DOI：
--
发表时间：
2007
期刊：
影响因子：
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作者：
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DOI：
--
发表时间：
1975
期刊：
影响因子：
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通讯作者：
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