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首页> 外文期刊>Facies >Guadalupian algae-sponge reefs in siliciclastic environments—the reefs at Lengwu (South China) compared with the reef at Iwaizaki (Japan)
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Guadalupian algae-sponge reefs in siliciclastic environments—the reefs at Lengwu (South China) compared with the reef at Iwaizaki (Japan)

机译：硅质碎屑环境中的瓜达鲁普海藻海绵礁—冷武（中国南部）的珊瑚礁与岩井崎（日本）的珊瑚礁相比

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摘要

Guadalupian reefs occur locally in Guangxi, Guizhou, Yunnan and Western Zhejiang, South China. Two types of Guadalupian reefs can be recognized, one is developed in carbonate platforms, e.g. those in the juncture areas of Guangxi, Yunnan and Guizhou; the other occurs in a littoral clastic shelf. The Lengwu reef in Western Zhejiang is a representative of the latter type, which is a major topic of this paper. Lengwu algae-sponge reef, more than one hundred meters in thickness, are composed mainly of sponges, hydrozoans, algae, bryozoans, microbes and lime mud. Reef limestones sit on the mudstone interbedded with fine sandstone of the proximal prodelta facies and are overlain by coarse clasts of the delta front sediments. Lengwu reef displays a lens-shaped relief, dipping and thinning from the reef core, which is remarkably different from the surrounding sediments, showing a protruding relief. Sponges and microbe/algae form bafflestone, bindstone and framestone of the reef core facies. Fore-reef facies is characterized by lithoclastic rudstone and bioclastic packstone. Reef limestone sequence is composed of three cycles and controlled by sea level changes and sediment influx. Such reef is unique among the Guadalupian reefs in South China, but seems similar in some aspects to Iwaizaki reef limestones of south Kitakami in Japan. Algae and microbes growing around sponges to form rigid structure in Lengwu reef are a typical feature, which is distinctly different to Guadalupian reefs in a stable platform facies of Guizhou, Yunnan and Guangxi, South China.
机译：瓜达鲁普礁分布于中国南方的广西，贵州，云南和浙江西部。可以识别两种类型的瓜达卢普礁，一种是在碳酸盐岩台地中发育的，例如在广西，云南和贵州交界处的那些；另一个发生在沿海碎屑层。浙西冷武礁是后一种类型的代表，这是本文的主要主题。冷屋海藻海绵礁厚度超过一百米，主要由海绵，水生动物，藻类，苔藓动物，微生物和石灰泥组成。礁石石灰岩位于与近前三角洲相细砂岩夹层的泥岩上，并被三角洲前缘沉积物的粗碎屑覆盖。冷雾礁呈现出透镜状的浮雕，从礁芯浸入并变薄，与周围的沉积物明显不同，呈现出凸起的浮雕。海绵和微生物/藻类形成礁岩核心相的挡板石，黏结石和框架石。前礁相的特征是碎屑碎屑质的ruststone和生物碎屑的堆积石。礁石石灰石层序由三个周期组成，并受海平面变化和沉积物涌入的控制。这种珊瑚礁在中国南方的瓜达鲁普珊瑚礁中是独一无二的，但在某些方面似乎与日本南部北上市的岩崎崎礁石灰岩相似。冷武礁中藻类和微生物在海绵周围生长形成刚性结构是一个典型特征，这与在中国南方的贵州，云南和广西的稳定平台相中的瓜达鲁安礁明显不同。

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