Norian serpulid and microbial bioconstructions: Implication for the platform evolution in the Lombardy Basin (Southern Alps, Italy)

DrFabrizioBerra; FlavioJadoul

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Norian serpulid and microbial bioconstructions: Implication for the platform evolution in the Lombardy Basin (Southern Alps, Italy)

机译：Norian serpulid 和微生物生物结构：对伦巴第盆地（意大利南阿尔卑斯山）平台演化的影响

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The development of peculiar margin facies and abundant talus breccias within the Dolomia Principale inner platform is commonly observed in the Lombardy Basin during the Norian. The organisms building these margins are mainly serpulids, benthic microbes, subordinate porostomata and other encrusting forms; typical margin organisms, as sponges or corals, are extremely rare or absent. The build-ups form narrow rims along the borders of tectonic-controlled intraplatform basins. Regional back-stepping and progradation of the margin facies on the talus breccias produced by the erosion of the reef is commonly observed in the uppermost Dolomia Principale depositional system. Widespread occurrence of serpulids and microbial margins in middle-late Norian times is indicative of stressed environmental conditions—fluctuation of salinity and temperature on the inner platform and in the intraplatform basins—controlled by palaeogeographic setting. Physical characteristics allowed the bloom of forms able to develop in a wide range of environmental conditions, such as serpul

机译：在诺里安时期的伦巴第盆地中，在伦巴第盆地中普遍观察到Dolomia Principale内层内奇特的边缘相和丰富的距骨角砾岩的发展。构建这些边缘的生物主要是锯齿虫、底栖微生物、从属孔虫和其他结壳形式;典型的边缘生物，如海绵或珊瑚，极为罕见或不存在。堆积物沿着构造控制的平台内盆地的边界形成狭窄的边缘。在最上层的Dolomia Principale沉积系统中，由于珊瑚礁的侵蚀而产生的距骨角砾岩边缘相的区域后退和渐变是常见的。在诺里安时代中晚期，锯齿状物和微生物边缘的广泛出现表明了受古地理环境控制的环境条件——内平台和平台内盆地的盐度和温度波动。物理特性允许能够在各种环境条件下发育的形式开花，例如锯齿

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《facies》 |2006年第1期|143-162|共页
作者
DrFabrizioBerra; FlavioJadoul;
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Università degli Studi di Milano;

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Norian serpulid and microbial bioconstructions: Implication for the platform evolution in the Lombardy Basin (Southern Alps, Italy)

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