Fluid-driven Hydrovolcanic Activity along Fracture Zones and near Seamounts: Evidence from Deep-sea Fe-rich Spherules, Central Indian Ocean Basin,Acta Geologica Sinica-English Edition

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Fluid-driven Hydrovolcanic Activity along Fracture Zones and near Seamounts: Evidence from Deep-sea Fe-rich Spherules, Central Indian Ocean Basin
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-03-30 , DOI: 10.1111/1755-6724.14697
Ankeeta AMONKAR _{1,

2} , Sridhar D. IYER ₃ , E.V.S.S.K. BABU ₄ , N. SHAILAJHA ₅ , Areef SARDAR ₁ , S. MANJU ₄

Affiliation

An insight on occurrence of Fe-rich spherules from the Central Indian Ocean Basin (CIOB) provides an understanding of their distribution at a water depth of >5,000 m. In the present study, Fe-rich spherules are identified to occur in two different sediment types (i.e., siliceous and pelagic) and tectonic settings (i.e. near seamounts and fracture zones). These are single spheres or aggregates, of different sizes (63 to 390 μm) and show textural variability (smooth/quenched, brickwork, corkscrew, interlocking and dendritic). A comparative study based on physical morphology and chemical composition suggests a common mechanism of formation. The association of spherules with fracture zones (FZ) and seamounts signifies that morpho-tectonic features play an important role in fluid-driven hydrovolcanism. Based on the evidence and geologic conditions existing in the basin, we conclude that molten fuel-coolant interaction (MFCI) coupled with submarine hydrothermal exhalations could be an ideal mechanism for the formation of spherules and Fe-particles. The accretion of the spherules on the surface sediments could be a result of recent volcanic phenomena, while those occurring at different depths (280–355, and 460–475 cm-bsf) within the sediment core indicate two different episodes. The study provides a global implication in understanding fluid-driven magmatism in a deep-sea intraplate environment.

中文翻译：

沿断裂带和海山附近的流体驱动的水火山活动：来自中印度洋盆地深海富铁球粒的证据

对中印度洋盆地 (CIOB) 富铁球体的发现提供了对它们在 > 5,000 m 水深的分布的了解。在本研究中，富铁球粒被确定出现在两种不同的沉积类型（即硅质和远洋）和构造环境（即靠近海山和断裂带）中。这些是不同尺寸（63 至 390 微米）的单个球体或聚集体，并显示出质地可变性（光滑/淬火、砖砌、开瓶器、互锁和树枝状）。基于物理形态和化学成分的比较研究表明了一个共同的形成机制。球粒与断裂带 (FZ) 和海山的关联表明形态构造特征在流体驱动的水火山作用中起着重要作用。根据盆地现有的证据和地质条件，我们得出结论，熔融燃料-冷却剂相互作用（MFCI）与海底热液呼出相结合可能是形成球粒和铁颗粒的理想机制。表层沉积物中球粒的增生可能是近期火山现象的结果，而沉积物核心内不同深度（280-355 和 460-475 cm-bsf）发生的火山现象表明有两种不同的事件。该研究为理解深海板内环境中流体驱动的岩浆活动提供了全球意义。表层沉积物中球粒的增生可能是近期火山现象的结果，而沉积物核心内不同深度（280-355 和 460-475 cm-bsf）发生的火山现象表明有两种不同的事件。该研究为理解深海板内环境中流体驱动的岩浆活动提供了全球意义。表层沉积物中球粒的增生可能是近期火山现象的结果，而沉积物核心内不同深度（280-355 和 460-475 cm-bsf）发生的火山现象表明有两种不同的事件。该研究为理解深海板内环境中流体驱动的岩浆活动提供了全球意义。

更新日期：2021-03-30

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