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首页> 外文期刊>Archives des sciences >Olistolithes et coulees bioclastiques:premices de linstallation de la plate-formeurgonienne aux confins des Bornes et des Aravis(Haute-Savoie, France)Olistolithes and bioclastic flows:early installation of the Urgonian platform betweenthe Aravis and Bornes Chains (Savoy, France)
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Olistolithes et coulees bioclastiques:premices de linstallation de la plate-formeurgonienne aux confins des Bornes et des Aravis(Haute-Savoie, France)Olistolithes and bioclastic flows:early installation of the Urgonian platform betweenthe Aravis and Bornes Chains (Savoy, France)

机译：橄榄石和生物碎屑流：在Aravis和Bornes链（法国萨沃伊）之间尽早安装Urgonian平台

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摘要

Olistolithes and bioclastic flows, beginning of the settling of the prograding urgonian platform in the Aravis and Bornes chains (Savoy, France). - In the Northern Subalpine Chains, in Savoy, below the Urgonian Limestone Formation, limestone olistolithes and bioclastic grain flows are intercalated in hemipelagic deposits dated by ammonites and echinoids. The olistolithes occur in central part of the Aravis Chain, while the bioclastic flows are found in the internal part of the Bornes Massif, respectively south and north of the Thones - Le Reposoir syncline. Identical, plentiful assemblages of orbitolinids, dated Upper Hauterivian, are found in these deposits. Noteworthy, significantly different, although coeval assemblages are found in nearby areas such as Rocher de Cluses, Pointe dAndey, a.s.o.Based on a number of models applied to different areas and geological ages, the olistolithes point to the dismantling of the edge of a prograding carbonate platform. In ther study area, they are enclosed in the low stand deposits (LST) of the sequen-ces Ha6 (top of the Ligatus Zone followed by the Balearis Zone) and Ha7 (Ohmi Zone pro parte).In the Northern subalpine Chains, the base of the overlying urgonian cliff, as mapped under the name of Urgonian Limestone Formation, is diachronous. In northern part of the Aravis Chain (Pointe Percee) it starts in low stand deposits of the Ha7 sequence, while further to the SW (Combe de Bella Cha, Adroit des Aravis), it starts in the low stand of the sequence Ba1 (basal Barremian). Elsewhere, in northern part of the Bargy Chain (Rocher de Cluses), it starts in low stand deposits of the Ha6 sequence, while further to the SE, at Bois des Etroits, it starts in the low stand of the sequence Ha7.As a preliminary result of this study, a so far unnoticed, perhaps geographically isolated carbonate platform extended during the Upper Hauterivian pro parte, roughly below the present-time Thones - Le Reposoir syncline, generating olistolithes and bioclastic debris flows, respectively southwards (toward the Aravis Chain) and northwards (toward the Bornes Massif). As a matter of fact, the northern and eastern extension of the Urgonian platform, beyond the Bornes Massif and the Aravis Chain, certainly remains ill-defined and differs from the present-time (alpine) structural trends.This article concludes with remarks concerning the uppermost Hauterivian and the lowermost Barremian biostratigraphy. Essentially two ammonites (Pseudothurmannia, Torcapella) and two species of echinoids (Toxaster retusus, T. seynensis) are dealt with, while the distribution of the orbitolinids, now duly calibrated on ammonites, is revised.
机译：橄榄石和生物碎屑流，开始在Aravis和Bornes链条（法国萨沃伊）中逐渐形成的乌干达平台沉降。 -在萨沃伊的北部亚高山链条中，在Urgonian石灰岩地层以下，石灰岩的橄榄石和生物碎屑流夹杂在由铵铁矿和棘突类物质形成的半沉积沉积物中。橄榄石发生在Aravis链的中部，而生物碎屑流则出现在Bornes断层的内部，分别在Thones-Le Reposoir向斜的南部和北部。在这些矿床中发现了相同的，数量众多的上胡特尔夫时代的轨道类化合物。值得注意的是，尽管在附近地区如Rocher de Cluses，Pointe dAndey，aso等发现了近代组合，但根据应用于不同地区和地质年代的许多模型，橄榄石岩表明正在分解的碳酸盐岩边缘平台。在该研究区域中，它们被封闭在序列Ha6（在Ligatus区域的顶部，其次是Balearis区域）和Ha7（Ohmi区域）的低阶沉积物（LST）中。以“ Urgonian石灰岩地层”的名称映射的上覆“乌克兰岩壁”的底部是历时的。在Aravis链的北部（Pointe Percee），它从Ha7序列的低位矿床开始，而到SW（Combe de Bella Cha，Adroit des Aravis）的更远的地方，它从Ba1序列的低位（基层）开始。巴雷米亚）。在其他地方，在Bargy Chain（Rocher de Cluses）的北部，从Ha6序列的低矮沉积开始，而到SE的Bois des Etroits的东南，它从Ha7序列的低矮开始。这项研究的初步结果是，一个尚未引起注意的，可能是地理上孤立的碳酸盐岩平台在上Hauterivian过程中扩展了，大约在当前的Thones-Le Reposoir向斜以下，分别产生了南部的橄榄石和生物碎屑流（向Aravis链） ）和向北（朝Bornes断层山）。实际上，除了Bornes断层块和Aravis链之外，Urgonian平台的北向和东向延伸当然仍然是不确定的，并且不同于当前（高山）的结构趋势。最上层的Hauterivian和最下层的Barremian生物地层。基本上要处理两种铵盐（假单胞菌属，托卡氏菌属）和两种类胆碱类物质（Toxaster retusus，T。seynensis），而现在已经对铵盐进行了适当校准的眶类动物的分布得到了修正。

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