The role of mud volcanism and deep‐seated dewatering processes in the Nankai Trough accretionary prism and Kumano Basin, Japan
The role of mud volcanism and deep‐seated dewatering processes in the Nankai Trough accretionary prism and Kumano Basin, Japan
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日本南海海槽增生棱柱和熊野盆地泥浆火山作用和深层脱水过程的作用
DOI：
10.1002/2016gc006763
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Völker
中科院分区：
文献类型：
--
作者：
Menapace;Völker
俯冲带中等深度的水循环主要是由粘土矿物在不同的压力和温度梯度上脱水所驱动的。这些脱水反应的特征是在泥火山的孔隙水中发现的，然而，有多少深层流体是从泥火山释放出来的，这在很大程度上是未知的。为了揭示这一关系，我们利用13座泥火山所在地区的IODP孔C0011和C0012的输入数据以及熊野盆地下俯冲板块释放的相应水量，计算了南开海槽的俯冲水量。根据我们的模型，泥火山地区深层释放的水几乎全部来自玄武岩皂石和沉积蒙脱石的转化[高达96%]。尽管如此，泥火山本身排出的≪占总量的1%。为了测试沉积地层和熊野盆地填充物对水收支的贡献，我们运行了第二个模型。计算了盆地底部以下沉积物压实和蒙脱石-伊利石转变引起的水损失。将结果与散布在研究区域的背景岩心的盐度测量结果进行比较，以推断深部的水分损失量。两种方法的比较产生了类似的结果，并使我们得出结论，深部流体的大部分通过盆地底部重新进入水圈，这一机制在文献中很少考虑到流体收支。
Circulation of water at moderate depths in subduction zones is dominantly driven by clay mineral dehydration over distinct pressure and temperature gradients. The signature of these dehydration reactions is found in mud volcano pore waters, however, it is largely unknown, how much of the deep‐seated fluids are emitted at mud volcanoes. To unravel this relation for the region off the Kii Peninsula, Japan, we calculated the water volume that is subducted in the Nankai Trough using input data from IODP holes C0011 and C0012 and the correspondent water volume released from the subducted plate under the Kumano Basin, in an area where 13 mud volcanoes are located. According to our model, water released at depth in the mud volcano area is derived almost entirely from basaltic saponite and sedimentary smectite transformation [up to 96%]. Nonetheless, the mud volcanoes themselves expel ≪1% of the total volume. To test the contribution of the accreted strata and the Kumano Basin fill to the water budget, we run a second model. Water loss due to compaction of sediments and smectite‐illite transition below the basin floor have been calculated. The results were compared with salinity measurements on background cores scattered in the study area to extrapolate the volume of water loss at depth. The comparison of the two methods yielded similar results and led us to conclude that the bulk part of the deep‐seated fluid reenters the hydrosphere via the basin floor, a mechanism rarely taken into account in fluid budgets in the literature.
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