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首页> 外文期刊>Facies >Lower Cretaceous shallow-water carbonates and a new lituolid foraminifer (Bulbobaculites felixi n. sp.) from the Northern Apuseni Mountains (Romania)
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Lower Cretaceous shallow-water carbonates and a new lituolid foraminifer (Bulbobaculites felixi n. sp.) from the Northern Apuseni Mountains (Romania)

机译：北阿普塞尼山脉（罗马尼亚）的下白垩统浅水碳酸盐岩和新的荔枝螺有孔虫（Bulbobaculites felixi n.sp.）

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摘要

Shallow-water carbonates from the Lower Cretaceous (upper Aptian) of the Subpiatra. Quarry (Apuseni Mountains, west Romania) contain a new species of lituolid foraminifera of the genus Bulbobaculites. The new foraminifer is characterized by a streptospiral initial part, followed by a rectilinear adult stage and a test-wall composed of agglutinated micritic grains. Within the Subpiatra. limestones, three main facies can be distinguished: (a) coastal and littoral, (b) open-shelf/lagoon, and (c) shelf margin with bioconstructions and bioclastic shoals. The lower part of the succession contains facies typical for peritidal environments, with both low-and high-energy subtidal limestones, overlain by thinly bedded supratidal limestones. The middle part of the section contains dominantly subtidal limestones assigned to the open-shelf system, whereas the upper part consists of micro-reefs with corals and rudists interlayered with bioclastic shoals. In terms of microfacies, the new species of Bulbobaculites is most common in bioclastic grainstone/rudstone and floatstone/packstone assigned to the coastal/littoral and lagoonal facies.
机译：来自亚p下白垩统（上阿普特地区）的浅水碳酸盐。采石场（罗马尼亚西部的阿普塞尼山）含有一种新的鳞茎类有孔虫有孔虫。新的有孔虫的特征是链螺旋体的最初部分，然后是直线成年阶段，以及由凝集的微晶颗粒组成的测试壁。在Subpiatra内。石灰岩可分为三个主要相：（a）沿海和沿海，（b）露天架/泻湖，以及（c）具有生物构造和生物碎屑滩的架缘。演替的下半部分包含典型的围岩环境相，包括低能量和高能量的潮汐下灰岩，上面覆盖着薄层上地幔灰岩。该部分的中部主要包含潮汐下的灰岩，这些灰岩被分配给了开放式陆架系统，而上半部分则是由微礁石和珊瑚以及带生物碎屑浅滩夹层的鲁迪斯组成。在微相方面，新的球泡石物种最常见于分配给沿海/滨海和泻湖相的生物碎屑颗粒岩/砾岩和浮石/堆积岩中。

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