Abstract Middle Eocene Fulra Limestone and Oligocene Maniyara Fort Formation represent platform carbonate deposits of Kutch at the north-western margin of India. These carbonates contain larger benthic foraminifera, including Alveolina, Assilina, Discocyclina, Lepidocyclina, Miogypsina, Nummulites and Spiroclypeus. This study presents paleodepositional and paleobathymetric interpretations for both formations using benthic foraminifera in combination with lithological association, sedimentary structures and early diagenetic features. The six carbonate facies comprising the Fulra Limestone indicate a depositional spectrum ranging from bar-lagoon to mid-ramp depositional conditions. It records several shallowing upward cycles, leading to emergence and formation of paleokarst. The four carbonate facies of the Maniyara Fort Formation represents deposition within the inner ramp setting in bar-lagoon and patch-reef environment, while intervening fine siliciclastics correspond to episodes of relative sea level fall. Nummulitic accumulations form low-relief bars within the fair weather wave base in both the formations. The depositional setting of the Paleogene carbonate in Kutch broadly resembles Eocene platformal deposits in the circum-Tethys belt.

中文翻译：

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卡奇中始新世-渐新世碳酸盐岩相和沉积环境

摘要 中始新世富勒拉石灰岩和渐新世马尼亚拉堡组代表了印度西北边缘库奇台地碳酸盐岩矿床。这些碳酸盐包含较大的底栖有孔虫，包括 Alveolina、Assilina、Discocyclina、Lepidocyclina、Miogypsina、Nummulites 和 Spiroclypeus。本研究使用底栖有孔虫结合岩性关联、沉积结构和早期成岩特征对这两种地层进行古沉积和古深海测量解释。包含 Fulra 石灰岩的六个碳酸盐岩相表明沉积谱范围从泻湖到中斜坡沉积条件。它记录了几个浅层向上旋回，导致了古岩溶的出现和形成。Maniyara Fort Formation 的四个碳酸盐岩相代表了泻湖和斑块礁环境中内斜坡环境中的沉积，而介于其间的细硅质碎屑对应于相对海平面下降的事件。在两个地层的晴朗天气波基内，Nummulitic 堆积形成了低浮雕条。Kutch 古近系碳酸盐岩的沉积环境与环特提斯带中始新世地台沉积物大体相似。