This study's goal is to understand the structural events and episodes of fluid flow recorded in calcium carbonate precipitation sampled in Mariana forearc serpentine mud volcanoes. Those active mounts provide a unique window to deep structural and fluid flow events affecting the subduction channel mélange zone and the subducted Pacific Plate.

To build a conceptual model of vein precipitations from the subduction zone to the mud volcanoes edifice, we unravelled the origin, timing, and mechanisms of those precipitations with a multidisciplinary study of calcium carbonate veins, from samples drilled in the flank of Fantangisña Seamount during the International Ocean Discovery Program (IODP) Expedition 366.

Structural analysis of the carbonate vein network revealed stages of precipitation and dissolution. The most ancient calcium carbonate minerals underwent high tectonic stress and several degrees of silicification. U-Pb dates ranged from Early Cretaceous to present day, recording potential pre-convergence events and calibrating an episodic building of the Mariana mud volcanoes from the start of the convergence to present day. The UCC-normalized LREE pattern, ⁸⁷Sr/⁸⁶Sr ratios ranging from 0.704977 to 0.705798 and δ¹⁸O signature 18.7 to 19.8 (‰, V-SMOW) of the veins indicate a mixed origin of the precipitated fluids influenced by the serpentine mud signature.

Those mud volcanoes were episodically built from the start of the subduction to present day in function of the forearc tectonic activity. They are complex systems internally composed of a fault network providing multiple circulation pathways that can be successively opened or closed.

这项研究的目的是了解在马里亚纳州前臂蛇形泥火山中采样的碳酸钙沉淀中记录的结构事件和流体流动。这些活动的坐骑提供了一个独特的窗口，可深入了解影响俯冲通道混杂带和俯冲太平洋板块的深部结构和流体流动事件。

为了建立从俯冲带到泥火山大厦的静脉降水的概念模型，我们对碳酸钙静脉的多学科研究，从范坦吉纳海山侧面钻探的样品中，揭示了这些降水的起源，时间和机理。国际海洋发现计划（IODP）远征366。

碳酸盐脉状网络的结构分析显示出沉淀和溶解的阶段。最古老的碳酸钙矿物经历了高构造应力和若干硅化程度。U-Pb的日期从白垩纪早期到今天，记录可能的收敛前事件，并校准从收敛开始到今天的马里亚纳泥火山的情景构造。该UCC标准化LREE图案，⁸⁷ SR / ⁸⁶ Sr比值范围从0.704977至0.705798和δ ¹⁸ ö签名18.7到19.8的静脉（‰，V-SMOW）指示由蛇形泥浆签名影响析出的流体的混合来源。

从俯冲开始到今天，这些泥火山是根据前陆构造活动而附生地建造的。它们是内部由故障网络组成的复杂系统，该故障网络提供了可以依次打开或关闭的多个循环路径。